中国南方灌丛凋落物现存量

doi:10.17521/cjpe.2016.0202

植物生态学报 ›› 2017, Vol. 41 ›› Issue (1): 5-13.DOI: 10.17521/cjpe.2016.0202 cstr: 32100.14.cjpe.2016.0202

所属专题：中国灌丛生态系统碳储量的研究；凋落物

中国南方灌丛凋落物现存量

葛结林¹, 熊高明¹, 李家湘¹, 徐文婷¹, 赵常明¹, 卢志军², 李跃林³, 谢宗强^1,^*()

¹中国科学院植物研究所植被与环境变化国家重点实验室, 北京 100093
²中国科学院武汉植物园水生植物与流域生态院重点实验室, 武汉 430074
³中国科学院华南植物园, 广州 510650

收稿日期:2016-06-14 接受日期:2016-11-10 出版日期:2017-01-10 发布日期:2017-01-23
作者简介:* 通信作者Author for correspondence (E-mail:sunzhiqiang1956@sina.com)
基金资助:
中国科学院战略性先导科技专项 (XDA05050302)

Litter standing crop of shrubland ecosystems in southern China

Jie-Lin GE¹, Gao-Ming XIONG¹, Jia-Xiang LI¹, Wen-Ting XU¹, Chang-Ming ZHAO¹, Zhi-Jun LU², Yue-Lin LI³, Zong-Qiang XIE^1,^*()

¹State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China

²Key Laboratory of Aquatic Botany and Watershed Ecology, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan 430074, China

³South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China

Received:2016-06-14 Accepted:2016-11-10 Online:2017-01-10 Published:2017-01-23
About author:KANG Jing-yao(1991-), E-mail: kangjingyao_nj@163.com。

摘要/Abstract

摘要：

凋落物是陆地生态系统的重要组成部分, 在区域尺度上阐明其现存量的分布特征及其影响因子有助于理解陆地生态系统碳循环的机理。该研究采用分层随机抽样调查方法分析了中国南方灌丛生态系统凋落物现存量的空间分布格局及其影响因子。结果发现: 该区域灌丛凋落物现存量的平均值为0.32 kg·m^-2, 是中国森林凋落物现存量(0.47 kg·m^-2)的68%, 是中国草地凋落物现存量(0.06 kg·m^-2)的5倍;凋落物现存量呈现出明显的纬度格局,随着纬度的增加而升高;该区域的灌丛生态系统凋落物现存量的碳转换系数为0.41,显著低于植被活体转换系数0.50;凋落物现存量与年平均气温、土壤全磷含量和土壤pH值显著负相关,与年降水量、土壤碳、氮以及有机碳含量相关性不显著。研究表明:该区域灌丛凋落物现存量是中国陆地生态系统碳库不可忽视的组分;年平均气温是影响该区域内灌丛生态系统凋落物现存量的重要环境因子;采用常用的植被活体碳转换系数可能会高估凋落物现存量碳库的22%。

关键词: 凋落物的累积, 空间格局, 碳转换系数, 年平均气温, 土壤属性, 气候

Abstract:

Aims Litter is an important component of terrestrial ecosystems, which plays significant roles in carbon and nutrient cycles. Quantifying regional-scale pattern of litter standing crop would improve our understanding in the mechanism of the terrestrial ecosystem carbon cycle, also with help in predicting the responses of carbon cycle of terrestrial ecosystems to future climate change. Our objective was to examine variation in litter standing crop of shrublands along the environmental gradients in southern China.
Methods During 2011-2014, we investigated the litter standing crop at 453 shrublands sites by the stratified random sampling, reflecting climatic and soil attributes across southern China.
Important findings We found that the mean value of litter standing crop in these shrubland ecosystems across southern China was 0.32 kg·m^-2. It was 68% of forest litter standing crop (0.47 kg·m^-2) and was five times higher than that in grasslands (0.06 kg·m^-2) in China. Litter standing crop increased with latitude. Our results showed that litter standing crop was negatively correlated with mean annual temperature, soil total P and soil pH, but not significantly correlated with other environmental variables, including mean annual precipitation, soil carbon, nitrogen and soil organic matter. The conversion coefficient of carbon in litter standing crop was 0.41, which is significantly lower than that of vegetation in shrublands (0.50), resulting in an overestimate in carbon storage of litter standing crop in shrubland up to 22% by applying wrong conversion coefficient. We concluded that litter standing crop of shrublands is an important component in terrestrial ecosystems. Mean annual temperature was the most important environmental variable, accounting for the variation in litter standing crop of shrublands in southern China. To our best of knowledge, this is the first study to quantify variation in litter standing crop of shrublands at the regional scale. Therefore, our study will have important implications for assessing the carbon budget of terrestrial ecosystems in China.

Key words: accumulation of litter, spatial pattern, conversion coefficient of carbon, mean annual temperature, soil attribute, climate

葛结林, 熊高明, 李家湘, 徐文婷, 赵常明, 卢志军, 李跃林, 谢宗强. 中国南方灌丛凋落物现存量. 植物生态学报, 2017, 41(1): 5-13. DOI: 10.17521/cjpe.2016.0202

Jie-Lin GE, Gao-Ming XIONG, Jia-Xiang LI, Wen-Ting XU, Chang-Ming ZHAO, Zhi-Jun LU, Yue-Lin LI, Zong-Qiang XIE. Litter standing crop of shrubland ecosystems in southern China. Chinese Journal of Plant Ecology, 2017, 41(1): 5-13. DOI: 10.17521/cjpe.2016.0202

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链接本文: https://www.plant-ecology.com/CN/10.17521/cjpe.2016.0202

https://www.plant-ecology.com/CN/Y2017/V41/I1/5

图/表 4

表1 所研究省市自治区的地理位置、气候和土壤养分概况

Table 1 General information on geographic location, climate and soil for different provinces, municipalities and autonomous regions

地点 Place	年份 Year	样点数 No. of sites	纬度 Latitude (N) (°)	经度 Longitude (E) (°)	海拔 Altitude (m)	年平均气温 Mean annual temperature (℃)	年降水量 Mean annual precipitation (mm)	土壤全碳 Soil total carbon (%)	土壤全氮 Soil total nitrogen (%)	土壤全磷 Soil total phosphorus (mg·g^-1)
江苏 Jiangsu	2012-2013	5	31.6-34.6	118.1-120.3	18-388	16.1	1 019.6	1.4	0.1	0.5
浙江 Zhejiang	2011-2013	26	27.5-31.1	118.4-122.3	27-631	18.2	1 784.3	1.8	0.2	0.3
安徽 Anhui	2011-2012	20	29.7-31.6	115.9-119.4	47-553	17.2	1 692.1	2.1	0.2	0.5
湖北 Hubei	2011-2013	74	29.1-32.9	108.7-115.8	61-1 865	16.3	1 375.2	2.3	0.2	0.6
江西 Jiangxi	2011-2013	49	25.0-29.6	113.9-117.5	28-601	20.0	1 641.0	1.7	0.2	0.4
福建 Fujian	2011-2013	39	24.1-27.9	116.4-120.2	42-1 132	20.3	1 795.1	1.3	0.1	0.2
广东 Guangdong	2011-2014	35	21.7-25.0	111.3-116.5	0-678	22.6	2 009.2	2.2	0.2	0.3
湖南 Hunan	2011-2013	70	25.1-29.7	109.6-113.9	61-1 405	18.6	1 547.3	2.5	0.2	0.4
重庆 Chongqing	2011-2013	50	28.5-32.0	105.9-110.0	173-1 506	16.8	1 355.3	2.9	0.2	0.6
广西 Guangxi	2011-2014	44	21.7-25.0	105.2-111.4	33-1 259	22.0	1 669.8	3.0	0.3	0.8
海南 Hainan	2011-2012	20	18.3-20.0	108.7-111.0	4-147	26.1	1 569.3	0.9	0.1	0.4

图1 中国南方灌丛凋落物现存量的频度分布图。

Fig. 1 Frequency distribution of litter standing crop of shrublands in southern China.

图2 中国南方灌丛凋落物现存量随经纬度的变化(平均值±标准误差)。A, 纬度。B, 经度。

Fig. 2 Variation in litter standing crop of shrublands across the latitudinal and longitudinal gradients in southern China (mean ± SE). A, Latitude. B, Longitude.

图3 中国南方灌丛凋落物现存量与环境因子的关系。本文仅显示凋落物现存量与环境因子关系显著的图。A-E, 现存量与单个环境因子(年平均气温、土壤全磷含量、土壤容重和干燥度)的关系。F, 现存量与年平均气温(MAT)、土壤全磷含量和土壤pH值之间的多元线性回归关系。

Fig. 3 Variation in litter standing crop of shrublands of southern China in relation to environmental factors in China. We only showed the figures that depicted the significant relationship between litter standing crop and environmental factors. A-E, The relationship between litter standing crop and single environmental variables including mean annual temperature (MAT), soil total phosphorus (P) content, soil pH value, soil bulk density and climatic dryness (Idw). F, Observed value vs. predicted value of litter standing crop from multiple regression using mean annual temperature (MAT), soil P content and soil pH value as predictors.

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中国南方灌丛凋落物现存量

Litter standing crop of shrubland ecosystems in southern China

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