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Table of Content
    Volume 48 Issue 4
    20 April 2024
    Warming impacts on the input, decomposition and persistence of soil organic carbon (SOC) and its uncertainty in top and deep soils (Contributor: QIN Wen-Kuan & ZHU Biao). Previous studies demonstrated that climate warming can alter soil carbon cycling by influencing plants-soil-microbial preoperties. Warming may change the amount and chemical structure of organic carbon input into the soil by altering plant community composition or carbon allocation, and regof this issue). [Detail] ...
      
    Responses and mechanisms of soil organic carbon dynamics to warming: a review
    Wenkuan Qin Qiufang Zhang Gukailin Ao
    Chin J Plant Ecol. 2024, 48 (4):  0-0.  doi:10.17521/cjpe.2023.0152
    Abstract ( 224 )   PDF (2157KB) ( 101 )   Save
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    The alteration of terrestrial carbon cycling under climate warming is regulated by soil organic carbon (SOC) dynamics. Previous studies have developed multiple warming methods, mainly including laboratory incubation experiment, field in-situ control experiment, and temperature gradient sampling, to investigate the responses and mechanisms of SOC dynamics to climate warming. However, due to the methodological limitations, the studies on the effect of warming on SOC dynamics cannot lead to consistent conclusions. SOC dynamics mainly include two processes: carbon input and carbon decomposition, and are also regulated by carbon persistence. The changes of carbon input, carbon decomposition, and carbon persistence together determine the response of SOC dynamics to warming. Previous studies showed that both carbon input and decomposition may positively respond to warming, which is related to the enhanced activities of plants and soil microbes. However, some studies pointed out that warming-induced alterations of soil physical and chemical properties (e.g., the decrease of soil water content) and biological processes (e.g., microbial community thermal adaptation) may affect the responses of carbon input and decomposition to warming. Moreover, inconsistent responses may arise when focusing on the SOC responses to warming in top (0–30 cm) or deep (>30 cm) soils due to the limitations of environmental factors on carbon input and decomposition in deep soils, as well as the different persistence of SOC in deep soils compared to top soils. Future research should focus on developing new warming methods, increasing research on deep soils and climate-sensitive ecosystems, introducing new technologies to study the source, structure, and protection of soil organic matter, paying attention to the response of plant-soil animal-soil microbe system to warming and its regulation on SOC dynamics, to improve uncertainties in carbon cycle models and more accurately predict the feedback of the global carbon cycle to climate warming.
    Nutrient foraging strategies of arbuscular mycorrhizal tree species in subtropical evergreen broadleaf forests and their relationship with fine root morphology
    Qu-Zekun Cai Shifeng Luo Suzhen Zhu Liqin Qi JIANG Xiao-Hong WANG Yao Xiaodong CHEN Guang-Shui
    Chin J Plant Ecol. 2024, 48 (4):  0-0.  doi:10.17521/cjpe.2023.0253
    Abstract ( 108 )   PDF (1075KB) ( 32 )   Save
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    Abstract The nutrient foraging strategies of arbuscular mycorrhizal (AM) fungi directly affect plant productivity and carbon sequestration, which is a key factor affecting the stability of forest ecosystems. Nutrient foraging accuracy is an important aspect of nutrient foraging strategy, which refers to the ability of plants to accurately deploy their roots and mycelia to relatively nutrient-rich patches. However, the tradeoff between root length foraging precision and myceliumand foraging precision of endomycorrhizal tree species and whether fine root morphology can predict feeding accuracy are still controversial. In this study, 17 endophytic mycorrhizal tree species within a natural broadleaf evergreen forest in the central subtropics were tested for phosphorus addition to in situ root bags in the field to simulate phosphorus nutrient patches in the soil. After 4 months of application of phosphorus fertilizer, morphological scanning and analysis were carried out on the fine roots of the control group and the phosphorus addition group, respectively. Mycelia in soil were extracted by membrane filtration method and observed by electron microscope. Mycelia with no septa in the middle and easy to stain were screened as AM endomycorrhiza mycelia, and their length was calculated. On this basis, root length foraging precision and mycelial foraging precision were calculated to investigate the trade-off between root length foraging precision and mycelial foraging precision and their correlation with fine root morphology in subtropical endophytic mycorrhizal tree species. The main results are: (1) root length foraging precision and mycelial foraging precision of AM species were independent of each other. (2) There was a significant positive correlation between fine root tissue density and root length foraging precision. (3) There was a significant negative correlation between fine root diameter and mycelial foraging precision, and a significant positive correlation between specific root length and mycelial foraging precision. The results of this study can help to provide a more comprehensive understanding of the root nutrient foraging strategies of AM species in subtropical evergreen broadleaf forests, and can provide some data support for prediction models for assessing the accuracy of fine-root nutrient foraging of AM species in subtropical evergreen broadleaf forests using easily observable metrics, such as fine-root morphology.
    Study of potential natural vegetation ecosystems carbon storage dynamics over China under climate change
    zhang jishen shi xinjie liu yunuo wu yang
    Chin J Plant Ecol. 2024, 48 (4):  0-0.  doi:10.17521/cjpe.2022.0352
    Abstract ( 135 )   Save
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    Aims Carbon sequestration in terrestrial ecosystems is one of the important ways to slow down the rise of atmospheric CO2 concentration. Understanding the natural vegetation ecosystems carbon storage (EC) under climate change is conducive to the formulation of regional land management policies. Methods In this study, the sensitive parameters of LPJ-GUESS model are calibrated based on genetic algorithm. Using the downscale climate data-driven model, combined with Mann Kendall test, Sen's slope estimation and partial correlation analysis, the temporal and spatial pattern, trend change characteristics and climate dominant factors of China's EC from 2001 to 2100 are analyzed. Important findings The Nash-Sutcliffe efficiency coefficient and Pearson correlation coefficient of the calibrated LPJ-GUESS model in simulating EC are 0.751and 0.901 respectively, indicating that the LPJ-GUESS model can simulate China's EC well. During 2001–2020, China's EC decreased from southeast to northwest, with a total amount of 156.06 Pg C.. Vegetation, litter and soil accounted for 34.2%, 1.9% and 63.8% respectively. The EC in 2081–2100 have the same spatial heterogeneity as that in historical periods. Compared with 2001–2020, the total amount of EC at the end of this century are expected to increase by 0.51–11.16 Pg C. During 2001–2020 and 2021–2100, the growth rates of China's EC was 8.5 gC·m-2·yr-1 (p<0.05) and 3.7–21.0 gC·m-2·yr-1 (p<0.05) respectively. During 2021–2100, there was a significant increase in southeast China, inner Mongolia Plateau, Qinghai Tibet Plateau and other regions (37–44 gC·m-2·yr-1, p<0.05), while the southern Yunnan Guizhou Plateau, Liangguang hills and other regions decreased significantly (45–72 gC·m-2·yr-1, p<0.05). Considering only that climate change may reduce China's EC, compared with 2001–2020, it will decrease by 1.5–5.8% during 2081–2100. In northwest China, temperature is the dominant factor affecting EC, Affected by the degree of regional drought, the correlation between EC and precipitation increases from southeast to northwest, In high latitude and high-altitude areas, radiation is the dominant factor of EC, 47.9-56.1% of China's area,CO2 is the dominant factor of EC.
    Prediction of suitable habitat distribution and potential impact of climate change on Cupressus gigantea
    Ruru WU GU Xian Xinyue CHANG Ke GUO Gao-Ming JIANG Ruyi QI
    Chin J Plant Ecol. 2024, 48 (4):  0-0.  doi:10.17521/cjpe.2023.0218
    Abstract ( 119 )   PDF (5613KB) ( 68 )   Save
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    With the changing of global climate, the growth and survival patterns of species are affected. Predicting changes in the potential range of geographic distribution for a species under climate change is an important tool for assessing the response of species to climate change and helps to develop scientific management strategies. Cupressus gigantea is an endemic species of Tibet and one of the national key protected plant species, but its habitat is narrow and becoming more and more vulnerable under global climate change. In this study, we simulated the habitat suitability of C. gigantea under current and future climate change in Tibet by using MaxEnt model and ArcGIS spatial analysis based on the current actual geographical distribution information of C. gigantea which is obtained by field investigation, Tibetan topographic factor variables, and environmental factor data under current and future climatic conditions, respectively. The results of the study show that: (1) The potential geographical distribution of C. gigantea is narrow, and the suitable areas is concentrated in Gacha County to Gongbu Jiangda County, through which the Yarlung Zangbo River flows in Tibet, with scattered distribution in Lhuntse County, Gonggar County, and Shona County in eastern Tibet. (2) The most suitable climatic factors for growth of C. gigantea are Variation of temperature seasonlity, Precipitation of coldest quarte, Altitude and Mean temperature of coldest quarter, with suitable ranges of 565.75—603.44、3.89—5.48 mm、2893.37—3517.09 m and -1.24—2.11 ℃, respectively. (3) Under the two future climate change scenarios, the areas of total, low and medium suitable areas of C. gigantea showed different degrees of increase compared with the areas of different levels of potential geographic distribution of C. gigantea under the current climate conditions, but the area of high suitable areas showed a clear trend of shrinkage. (4) Compared to the current center of mass, the center of mass in the SSP1-2.6 future scenario would be shifted to the southeast by 19.897 km and the center of mass in the SSP5-8.5 future scenario would be shifted the east by 20.710 km. The results of the study are of great scientific significance and practical guidance for the investigation of key environmental factors for the growth of C. gigantea, the recovery and renewal of C. gigantea populations, and the improvement of the survival environment of C. gigantea.
    Responses of radial growth and biomass allocation of Larix gmelinii to climate warming
    逸娴 梁 Chuan-Kuan WANG Hongyu SHANGGUAN Yi-xiao LIU Xian-Kui QUAN
    Chin J Plant Ecol. 2024, 48 (4):  0-0.  doi:10.17521/cjpe.2023.0032
    Abstract ( 112 )   PDF (566KB) ( 23 )   Save
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    Aims Studying the impact of climate warming on tree growth is of great significance for further exploring the response of forest ecosystems to climate change. Methods In 2004, the seedlings of Larix gmelinii from four different locations (i.e., Tahe, Songling, Heihe and Dailing from north to south) were transplanted southward to a common garden at Maoershan Forestry Research Station in Heilongjiang Province to simulate climate warming. The radial growth and biomass allocation of trees in common garden and original sites were measured simultaneously. Important findings Warming treatment significantly increased the radial growth of trees from Songling and Ta-he sites. The stem diameter at breast height (DBH), diameter at 10 cm from the ground (D10), relative increasing rate of DBH and D10, and relative increasing rate per warming amount of DBH and D10 increased with the in-creasing of warming amount. The relative increasing rate of DBH for Songling and Tahe sites were 58.62% and 101.49%, respectively, the relative increasing rate per warming amount were 16.11%·℃-1 and 18.79%·℃-1, cor-respondingly. Warming treatment significantly decreased the proportion of leaf, branch and root biomass of trees from Tahe site and increased the proportion of stem, leaf, aboveground biomass. The proportion of root biomass significantly decreased and the proportion of stem biomass increased for the trees from Songling site under warming treatment. The root-shoot ratio significantly decreased for the trees from Songling and Tahe sites under warming treatment. Climate warming can affect the radial growth and biomass allocation of L. gmelinii, and this effect varied with the warming amount.
    Stoichiometric characteristics of leaf, branch and root in Larix gmelinii in response to climate warming based on latitudinal transplantation
    Chuan-Kuan WANG 逸娴 梁 Yi-xiao LIU Hongyu SHANGGUAN Xian-Kui QUAN
    Chin J Plant Ecol. 2024, 48 (4):  0-0.  doi:10.17521/cjpe.2023.0013
    Abstract ( 100 )   PDF (1282KB) ( 51 )   Save
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    Aims Exploring the impact of climate warming on stoichiometric characteristics of trees is of significance for understanding the response mechanism of trees to climate warming. Methods In 2004, we carried out a common garden experiment by transplanting Larix gmelinii trees from four geographically distant sites to a common garden near the warm edge of this species’ range in China to measure the content of carbon (C), nitrogen (N) and phosphorus (P) in leaves of short branch, leaves of long branch, short branches, long branches, and fine roots at three diameter classes. Important findings The C, N, and P concentrations in leaves of short branch and roots of all diameter classes and the N and P concentrations in leaves of old branch were significantly different among sites. The trees at high latitude sites had lower C and N concentrations and higher P concentration than those at low latitude sites. Warming treatment significantly increased the C concentration in all organs (except root at 1-2 mm diameter), and significantly increased the N concentration in leaves, long branches and roots <1 mm diameter, and significantly increased the P concentration in all organs (except short and long branches). The climate warming effect on C and P concentrations decreased with the warming amount, and increased for N concentration. The C:N, C:P and N:P in all organs (except short and long branches) were significantly different among sites. The trees at high latitude sites had higher C:N and lower C:P and N:P than trees at low latitude sites. Warming treatment significantly decreased the C:N, C:P and N:P in all organs except short and long branches. In summary, the stoichiometric characteristics had evident geographical variations in resource acquisition organs of leaves and roots of L. gmelinii. Warming treatment mainly alleviated the constraints on the demand for N and P in leaves and roots, and simultaneously reduced the carbon sequestration efficiency of N and P. The impact of climate warming on the stoichiometric characteristics of C and P elements decreased as the warming amount increase, except N element.
    Tree height variations of mangroves and environmental adaptive mechanism in coastal areas of China
    Yuan-Fang PAN Liang-Hao PAN qiu siting Guang-Long QIU su zhinan shi xiaofang
    Chin J Plant Ecol. 2024, 48 (4):  0-0.  doi:10.17521/cjpe.2023.0033
    Abstract ( 132 )   PDF (2492KB) ( 43 )   Save
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    Abstract Aims The aim of this study is to gain an in-depth understanding of tree height variation and its formation mechanism in China’s coastal mangroves. This understanding can provide a scientific basis for the restoration and afforestation of China’s coastal mangroves and the reconstruction of mangrove ecosystems. Methods To achieve this, we analyze all literature on soil, climate, and tidal range in relation to tree height in mangroves of China from 1990 to 2022. We establish a database of mangrove tree height and environmental factors to compare the differences in tree height and environmental factors between mangroves in Guangxi Zhuangzu Autonomous Region and the Southeast coast. Additionally, we analyze the relationship between environmental factors and mangrove tree height as well as the key factors affecting the tree height of mangroves in Guangxi coast and the Southeast coast. Important findings Our results show that the tree height of Guangxi coastal mangroves is significantly lower than that of the Southeast coastal mangroves. There are significant differences in environmental factors between Guangxi and the Southeast coastal provinces, with Guangxi having the highest average annual rainfall, mean tidal range, and soil salinity and the lowest soil pH, soil total nitrogen, and total phosphorus. Except for soil organic matter and average annual rainfall, other environmental factors show a significant correlation with mangrove tree height. Among them, mean tidal range, soil pH, and soil salinity are significantly and negatively correlated with mangrove tree height, while average annual temperature, soil bulk density, soil total nitrogen, and soil total phosphorus are significantly and positively correlated with mangrove tree height. The results of structural equation models show that mean tidal range, total soil phosphorus, and soil pH are the most critical environmental factors affecting mangrove tree height, and the average annual rainfall and average annual temperature directly affect the radial growth of mangroves or indirectly affect the tree height of mangroves by regulating the interrelationships between other environmental factors. Linear mixed-effects model show that the average annual temperature, mean tidal range, and soil salinity are the main factors limiting the radial growth of mangroves along the coast of Guangxi Province, while the radial growth of mangroves in the Southeast coastal areas is mainly limited by soil factors (except for Fujian Province).
    Comparison of classification methods of tree sap flow components at night—Taking Populus tomentosa as an example
    shangjin Yang Yun-Xiang FAN Yu-Wen ZHANG qiaoling Han Yue Zhao JIE DUAN Nan DI Ben-Ye XI
    Chin J Plant Ecol. 2024, 48 (4):  0-0.  doi:10.17521/cjpe.2023.0043
    Abstract ( 141 )   PDF (539KB) ( 15 )   Save
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    Aims Nighttime sapflow can be lost through the leaves, as nocturnal transpiration, or stored in the stem, as nocturnal refilling. For a long time, it has been a difficult problem to distinguish transpiration and refilling from nighttime sap flow. The prediction method has been widely used due to its convenience, but its accuracy has been questioned. Methods In order to systematically analyze the accuracy and applicability of four prediction methods for the division of nighttime sap flow components, Populus tomentosa was used as the test material in this study, and the TDP probe was used to measure the nighttime sap flow, and the sap height difference method was used to The application effects of four prediction methods are compared. Important findings Among the nocturnal transpiration estimated by four prediction methods using sap flow data at different trunk heights, only the prediction method based on the linear decay model (Line method) had no significant error in calculation results (P>0.05). There is a large deviation when other methods are applied (P<0.05). Compared with the stem refilling calculated by the sap flow height difference method, the stem refilling estimated by the four prediction methods using the sap flow data at different trunk heights, only the prediction results of the prediction method (Et method) based on extend transpiration inversion had a very significant dif-ference (P<0.01), and the other prediction methods were not significant (P>0.05), and the Line method had the smallest deviation.On the basis of the above results, this study proposes the sap flow height difference prediction method as a new method for the division of nighttime sap flow components, which is used to refine the nighttime sap flow components into three.The height difference method was used to improve the estimation accuracy of the stem refilling components below the canopy, and the Line method with the smallest error was used to divide the branch refilling components and leaf transpiration components inside the canopy.The nighttime refilling calcu-lated by the new method is 19.8%-26.5% higher than the existing research, which is about 76.5%. The divided response results of nighttime sap flow components and environmental factors show that VPD and shallow soil water content drive the nocturnal refilling. The proportion of nocturnal transpiration in nighttime sap flow was negatively correlated nonlinearly with VPD. This study provides a new idea for the accurate estimation of tree water use at night, and provides a method reference for accurately revealing the water use strategy and mechanism of trees at night.
    Rhizosphere effects of Betula platyphylla and Quercus mongolica and their seasonal dynamics in Mt. Dongling, Beijing
    Liang-Chen FU Zongju Ding Mao Tang Hui ZENG
    Chin J Plant Ecol. 2024, 48 (4):  0-0.  doi:10.17521/cjpe.2022.0485
    Abstract ( 118 )   PDF (924KB) ( 22 )   Save
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    Aims The objective of this study was to explore the seasonal variations of the rhizosphere effects of woody plants and their driving factors, and to assess the importance of plant functional traits in the control of rhizosphere processes. Methods We collected paired rhizosphere and bulk soils of the dominant tree species of two main types of vegetation in Dongling Mountain, Beijing, Betula platyphylla forest and Quercus mongolica forest. Soil physi-ochemical properties, microbial biomass, carbon and net nitrogen mineralization rates, extracellular enzyme activities and vector characteristics of rhizosphere and bulk soils, as well as plant root and leaf functional traits, in spring (May), summer (July), autumn (September), and winter (December) of 2017 were measured to analyze the seasonal dynamics of rhizosphere effects and their driving factors. Important findings (1) There were significant differences in soil pH, NH4+-N, microbial biomass, carbon and net nitrogen mineralization rates, extracellular enzyme activities and vector characteristics between rhizosphere soil and bulk soil, and these rhizosphere effects were mainly positive. (2) The rhizosphere effects had significant seasonal dynamics, usually being strongest in autumn. (3) There were often significant correlations between rhizosphere effects and plant root and leaf functional traits. Among them, fine root biomass was significantly and positively correlated with the rhizosphere effect on extractable organic carbon, soil total carbon and total nitrogen. Leaf dry matter content and leaf carbon and nitrogen ratio were significantly and positively correlated with the rhizosphere effect on microbial biomass carbon, microbial biomass nitrogen, carbon mineralization rat, and acid phosphatase activity. These results showed that the functional traits of plants were of great significance in rhizosphere processes. In the temperate deciduous broadleaf forest in Mt. Dongling, the highest belowground carbon allocation of plants leads to an increase in the biomass and activity of rhizosphere microorganisms in autumn, which makes the rhizosphere effect of microbial biomass and activity in autumn higher than that in other seasons.
    Temperature sensibility of soil net nitrogen mineralization rates in different types of grassland
    Wang Ge Hu Shuya Yang LI Chen Xiaopeng Hong-Yu Li Kuan-Hu DONG Nianpeng He Chang-Hui Wang
    Chin J Plant Ecol. 2024, 48 (4):  0-0.  doi:10.17521/cjpe.2022.0346
    Abstract ( 242 )   PDF (1295KB) ( 53 )   Save
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    Aims Soil available nitrogen (N), generated from a series of soil mineralization processes, is a major limiting factor of terrestrial ecosystem productivity. Soil N availability depends on soil microorganisms, vegetation types and soil physical and chemical properties. Soil microorganisms are very sensitive to environmental changes, especially the temperature changes are closely related with microbial growth and reproduction. Therefore, it is important to understand the temperature sensitivity (Q10) of microbial regulation of nitrogen mineralization in a large spatial scale to predict the impacts of global climate changes on terrestrial ecosystem productivity. Methods We selected three types of grasslands (namely meadow steppe, typical steppe, and desert steppe) respectively in Nei Mongol Plateau, Loess Plateau, and Qingzang Plateau, measured soil N mineralization rates at different temperatures in the laboratory, and calculated Q10 with mineralization results at different temperatures. Soil microbial indexes and soil physical and chemical properties were also analyzed. Important findings The highest Q10 of soil net N mineralization was found in Loess Plateau among three grassland types, compared with grassland types of other two plateaus. The Q10 values of soil net N mineralization in meadow steppe and typical steppe on the Loess Plateau and Nei Mongol Plateau were significantly higher than that in desert steppe while on the Qingzang Plateau, the values in alpine meadow were significantly lower than that in alpine typical steppe and alpine desert steppe. (3) The soil microbial biomass carbon was significantly correlated with temperature sensitivity of soil net nitrogen mineralization rate. (4) The spatial pattern of Q10 is jointly regulated by microorganisms, soil texture and substrate. The results of this study provide important data for the study of the response of grassland soil nitrogen cycle to global change in northern China, which has important scientific value for the calibration of N cycle models in terrestrial ecosystems in the future.
    A plot-based dataset of plant community in Qaidam Basin
    Shao-Qiong Dong HOU Dong-Jie xiao-Yun QU Ke GUO
    Chin J Plant Ecol. 2024, 48 (4):  0-0.  doi:10.17521/cjpe.2023.0024
    Abstract ( 476 )   PDF (687KB) ( 204 )   Save
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    Located in the northeast of the Qinzang Plateau, Qaidam Basin is a huge plateau-type closed basin. The vegetation is dominated by desert, including swamp wetlands, halophytic meadows and montane grasslands. In order to show the species composition, community characteristics and distribution pattern of vegetation in Qaidam Basin in more detail, this paper uses the field data of the Second Tibetan Plateau Scientific Expedition and Reserch of 2022 and the Comprehensive Scientific Investigation of the Data-scarce Area of the Qinghai-Tibet Plateau of 2014, including 157 sample plots and 458 sample plots, which are integrated into the sample data set of plant communities in Qaidam Basin. Through the collation and compilation of data, a total of 185 species information was obtained, among which the families with the largest number of species were Asteraceae (39 species), Poaceae (33 species), Fabaceae (17 species), Amaranthaceae (16 species) and Brassicaceae (10 species) , and the genera with the largest number of species were Stipa, Artemisia, Astragalus, Oxytropis and Saussurea. The composition of plant life form is dominated by herbs, accounting for 78.37%. The species of middle Asia account for 41.62% of the geographical composition of the flora. Based on the phytocoenological-ecological principles, 163 sample plots can be classified into 4 vegetation formation groups, 7 vegetation formations, 11 vegetation subformations and 40 alliances. This data set can provide the most original basic data for the in-depth study of vegetation characteristics in Qaidam basin, the compilation and research of the Vegegraphy of China, and the mapping of Qingzang Plateau and the national vegetation map.

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