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

所属专题: 中国灌丛生态系统碳储量的研究

• 研究论文 • 上一篇    下一篇

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. 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
  • 通讯作者: 谢宗强
  • 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 XIE1,*()   

  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
  • Contact: Zong-Qiang XIE
  • About author:KANG Jing-yao(1991-), E-mail: kangjingyao_nj@163.com

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