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Table of Content
    Volume 22 Issue 2
    10 February 1998
      
    Research Articles
    Net Primary Production of Terrestrial Ecosystems in China and its Equilibrium Responses to Changes in Climate and Atmospheric CO2 Concentration
    Xiao Xiangming, J. M. Melillo, D. W. Kicklighter, Y. Pan, A. D. McGuire, J. Helfrich
    Chin J Plan Ecolo. 1998, 22 (2):  97-118. 
    Abstract ( 1801 )   PDF (1736KB) ( 864 )   Save
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    We used the Terrestrial Ecosystem Model(TEM, 4.0) to estimate net primary production (NPP) in China for contemporary climate and NPP responses to elevated CO2 and climate changes projected by three atmospheric general circulation models(GCMs): Goddard Institute for Space Studies (GISS), Geophysical Fluid Dynamic Laboratory (GFDL) and Oregon State University (OSU). For contemporary climate at 312.5 × 10-6v CO2,TEM estimates that China has an annual NPP of 3,653 TgC·a-1(1012gC·a-1). Temperate evergreen broadleaf forest is the most productive biome and accounts for the largest portion of annual NPP in China, The spatial pattern of NPP is closely correlated to the spatial distributions of precipitation and temperature. Annual NPP of China is sensitive to changes in CO2 and climate. At the continental Scale, annual NPP of China increases by 6.0%(219TgC·a-1)for elevated CO2 only (519 ×10-6v CO2). For climate change with no change in CO2, the response of annual NPP ranges from a decrease of 1.5% (54.8TgC·a-1)for the GISS climate to an increase of 8.4% (306.9TgC·a-1) for the GFDL-q climate. For climate change at 519 Ï 10-6 v CO2, annual NPP of China increases substantially, ranging from+18.7% (683TgC·a-1) for the GISS climate to +23.3% (851 TgC·a-1) for the GFDL-q climate. Spatially, the responses of annual NPP to changes in climate and CO2 vary considerably within a GCM climate. Differences among the three GCM climates used in the study cause large differences in the geographical distribution of NPP responses to projected climate changes. The interaction between elevated CO2 and climate change plays an important role in the overall response of NPP to climate change at 519 × 10-6 v CO2.
    Soil Respiration of Mountainous Temperate Forests in Beijing, China
    Liu Shaohui, Fang Jingyun, Makoto Kiyota
    Chin J Plan Ecolo. 1998, 22 (2):  119-126. 
    Abstract ( 1555 )   PDF (464KB) ( 1259 )   Save
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    Estimation of Community Productivity and Net CO2 Accumulation of a Tropical Mountain Rain Forest in Jianfeng-ling, Hainan Island, China
    Li Yide, Wu Zhongmin, Zeng Qingbo, Zhou Guangyi, Chen Bufeng, Fang Jingyun
    Chin J Plan Ecolo. 1998, 22 (2):  127-134. 
    Abstract ( 1768 )   PDF (498KB) ( 1037 )   Save
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    Gap Disturbance Regime in a Broadleaved-Korean pine Forest in the Changbai Mountain Natural Reserve
    Zang Runguo, Liu Tao, Guo Zhongling, Gao Wentao
    Chin J Plan Ecolo. 1998, 22 (2):  135-142. 
    Abstract ( 1990 )   PDF (534KB) ( 982 )   Save
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    This paper deals with the basic characteristic of gap disturbance in a broadleaved-korean pine forest in the Changbai Mountain Natural Reserve. Some important paraments related to the disturbance regimes were described. The result shows that expanded gaps occupied 27.36% and Canopy gaps occupied 13.05% of land area in the forest. The frequency of gap disturbance was 0.15% per year. The distribution pattern of gaps in the forest belonged to the uniform type. The most important manner of gap formation was uprooting blown down, and the secondly important was breakage at trunk base. Most of gaps were formed by 1~4 gap makers. Major gap makers in the forest were Pinus koraiensis, Fraxinus mandshurica, Ouercus mongolica and Tilia amurense. The probability of making gaps was greatest when the big trees in the canopy layer got D. B. H. 40~60cm and height 25~30m.
    The Biocycling of Nutrient Elements in Artificial Trifolium pratense Grassland
    Du Zhanchi, Zhong Huaping
    Chin J Plan Ecolo. 1998, 22 (2):  149-156. 
    Abstract ( 1611 )   PDF (488KB) ( 890 )   Save
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    This paper deals with the biocycling characteristics of 11 nutrient elements of artificial Trifolium pratense grassland in high mountain region of northern subtropical zone of China. The chief results obtained are as follows:

    1. The retaining, returning and uptake amount of nutrient elements could be classified into five levels: 1 ) high-amount: N, K, Ca; 2 ) middle-amount: P, Mg; 3) low-amount: Fe; 4) a small-amount; Mn, Zn, Cu, B; 5) micro-amount :Mo.

    2. The net production, natural returning and retaining amount of elements in aboveground portion were a markedly higher than that of underground in T. pratense community.

    3. The outputs of N, K, Ca were higher than other elements.

    4. The difference of nutrient element biocycling characteristic between T. pratense community for forage and for seed are as follows: l) the retaining amounts of nutrient element of aboveground portion in the community for forage were all higher than that of in the community for seed. The retaining amounts of underground portion were contrary to aforementioned results. 2) The returning amounts and returning ratio in the community for seed were a markedly higher than that of in the community for forage generally. 3) The uptake amounts of P,K and Fe in the community for seed were higher than that for forage, the uptake amounts of Ca, Mg and B in the community for forage were higher than that for seed.

    In order that the balance of nutrient matter of artificial. T. pratense grassland in this region was maintained, P fertilizer must be applied. The application amount should not be less than 250kg·hm-2 calcium superphosphate at present.

    Size Hierarchy and its Genetic Analysis in Spring Wheat Population Under Different Water Conditions
    Xin Xiaoping, Wang Gang, Zhao Songling
    Chin J Plan Ecolo. 1998, 22 (2):  157-163. 
    Abstract ( 1495 )   PDF (414KB) ( 675 )   Save
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    The Xeromorphic and Saline Morphic Structure of Leaves and Assimilating Branches in Ten Chenopodiacea Species in Xinjiang
    Deng Yanbin, Jiang Yancheng, Liu Jian
    Chin J Plan Ecolo. 1998, 22 (2):  164-170. 
    Abstract ( 2484 )   PDF (942KB) ( 1224 )   Save
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    This paper deals with an anatomical structures of the leaves and assimilating branches of Chenopodiacea growing in deserts of Xinjiang using light microscope (LM) and scanning electron microscopie (SEM), including Atriplex centralasiatica, Ceratoides ewersmanniana C. latens, Halocnemum strobilaceum , Halostachys caspica , Haloxylon ammodendron , Kalidium schrenkianum , Londesia eriantha , Salsola ferganica , S. foliosa. The results show that they adapted to saltmorphic circumstances through the following characters: thick leaf blades and cuticula; possessing epidermal hairs; sunken stomas, developed palisade, many equilateral leaves, and the assimilating branches taking place of photosynthetic function of some modified leaves. Most of the leaves and assimilating branches plants have mucilage cells or crystal cells. The well-developed water-storing tissues with large cells were seen in interior to the assimilating branches. The gathering and secreting saline plants were distinguished according to the salt secreting out or not. There were different kinds of salt glands in the secreting saline plants, such as one cell gland and the multi-cellular glands as well as secreting stomata. Both the mechanism of gathering and secreting saline in the plants were also investigated in this paper.
    A Physioecological Study on Seed Germination of Mosla hangchowensis
    Ge Ying, Chang Jie, Yue Chunlei, Lu Dagen
    Chin J Plan Ecolo. 1998, 22 (2):  171-177. 
    Abstract ( 1869 )   PDF (376KB) ( 897 )   Save
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    Study on the Productivity and Ecological Benefits in Mixed Forests of Cunninghamia lanceolata and Alniphyllum fortunei
    Ma Xianqing, Zhuang Mengneng, Ye Zhangshan
    Chin J Plan Ecolo. 1998, 22 (2):  178-185. 
    Abstract ( 1776 )   PDF (406KB) ( 742 )   Save
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    The different mixed models of Cunninghamia lanceolata and Alniphyllum fortunei and their pure forests were studied in this paper by comparing the stand structure, biomass, community character, productivity and ecological benefits. The results showed that the mixed forests of C. lanceolata and A. fortunei were a new mixed model having higher productivity and more coordinative iw mixeecific relationship. The volume and biomass of seven-year old mixed forest (3 C. lanceolata: 1 A. fortunei) increased by 7.24% and 18.22% than those of the pure stands respectively. Moreover, the mixed forests had better ecological function to ameliorate soil fertility, conserve water and improve microclimate than the pure forests. By means of Analytic Hierarchy Process, it was recognized that the mixed forest of 3 C. lanceolata with 1 A. fortunei was a practicable mixed model in southern China.
    Geographic Variation of DBH Growth of Chinese Fir Provenances
    Hong Wei, Wu Chengzhen
    Chin J Plan Ecolo. 1998, 22 (2):  186-192. 
    Abstract ( 1752 )   PDF (379KB) ( 861 )   Save
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