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典型温带草原群落土壤呼吸温度敏感性与土壤水分的关系
引用本文:陈全胜,李凌浩,韩兴国,阎志丹,王艳芬,张焱,熊小刚,陈世苹,张丽霞,高英志,唐芳,杨晶,董云社.典型温带草原群落土壤呼吸温度敏感性与土壤水分的关系[J].生态学报,2004,24(4):831-836.
作者姓名:陈全胜  李凌浩  韩兴国  阎志丹  王艳芬  张焱  熊小刚  陈世苹  张丽霞  高英志  唐芳  杨晶  董云社
作者单位:1. 中国科学院植物研究所植被数量生态学重点实验室,北京,100093
2. 中国科学院地理科学与资源研究所,北京,100101
基金项目:中国科学院知识创新工程重大项目(KZCX1-SW-0 1-0 4,KSCX1-0 8-0 3 ),国家重点基础研究发展规划项目 (G2 0 0 0 0 1860 3,G19990 43 40 7)~~
摘    要:工业革命以来,人类活动所导致的CO2等温室气体的浓度在大气中持续上升,全球表面温度因此不断升高。在全球温暖化的背景下,土壤呼吸与温室效应之间正反馈关系势必影响到未来陆地生态系统功能与全球变化的趋势,所以,关于土壤呼吸对温度变化响应的研究备受瞩目。土壤呼吸对温度依赖性的研究已经有许多报道,其关系可以用简单的指数方程表示。但是,土壤水分条件对于土壤呼吸温度敏感性(用Q10表示)的影响却研究得较少。采用碱液吸收法对内蒙古典型温带草原11个不同水分状况群落的土壤呼吸进行了测定,并分析了土壤呼吸的温度敏感性。结果显示土壤呼吸的温度敏感性存在一定程度的空间变异,各群落Q10值平均为1.65,变异系数为6.94%。其中,春小麦群落的Q10值最高(1.84),其次是湿生杂类草群落(Q10=1.78),而Q10最低的是冷蒿(aRMESIA FRIGIDA)-星毛萎陵菜(pOTENTILLA ACAULIS)群落(1.47)。用Spearman秩相关分析法对表层土壤(O~20cm)水分与Q10值之间的关系进行了分析,结果表明各群落Q10值与生长季土壤平均水分含量呈显著的正相关关系(R=0.64545,p=0.032),说明水分状况对土壤呼吸的温度敏感性有一定程度的影响。由此推断,在中国温带草原地区,温度升高对较湿润区域土壤呼吸的影响大于较干旱区域。全球变化导致的水分时空格局的变化可能对温带草原土壤呼吸有较大的影响。所以,模拟大尺度土壤CO2排放量时,水分因素必须作为一个重要的变量加以考虑。

关 键 词:土壤CO2排放  土壤含水量  Spearman秩相关系数  Q10值
文章编号:1000-0933(2004)04-0831-06
收稿时间:2003/4/18 0:00:00
修稿时间:2003/9/21 0:00:00

Temperature sensitivity of soil respiration in relation to soil moisture in 11 communities of typical temperate steppe in Inner Mongolia
CHEN Quansheng,LI Linghao,HAN Xingguo,YAN Zhidan,WANG Yanfen,ZHANG Yan,XIONG Xiaogang,CHEN Shiping,ZHANG Lixi,GAO Yingzhi,TANG Fang,YANG Jing and DONG Yunshe.Temperature sensitivity of soil respiration in relation to soil moisture in 11 communities of typical temperate steppe in Inner Mongolia[J].Acta Ecologica Sinica,2004,24(4):831-836.
Authors:CHEN Quansheng  LI Linghao  HAN Xingguo  YAN Zhidan  WANG Yanfen  ZHANG Yan  XIONG Xiaogang  CHEN Shiping  ZHANG Lixi  GAO Yingzhi  TANG Fang  YANG Jing and DONG Yunshe
Institution:Laboratory of Quantitative Vegetation Ecology; Institute of Botany; Chinese Academy of Sciences; Beijing
Abstract:Atmospheric concentrations of greenhouse gases have increased dramatically since the beginning of industrial revolution due to human activities such as fossil fuel combustion and land-use change. Because of the increasing atmospheric concentrations of greenhouse gases and their greenhouse effect, a recent IPCC report has predicted that a much warmer climate is coming. Carbon dioxide is one of the most concerned greenhouse gases in the study of global climate change. Because soil respiration is a major process that controls and influences atmospheric CO_2 concentration, response of soil respiration to temperature changes has become a focal point in studies of the global carbon cycle. In addition to temperature soil moisture is another important factor that affects soil respiration. While many studies have shown that temperature exerts a major control on soil respiration, the relationship between temperature sensitivity of soil respiration (often expressed as Q _(10)) and soil moisture conditions is rarely investigated. Using the alkali absorption technique, we measured soil CO_2 efflux in 11 temperate steppe communities in Xilin River basin, Inner Mongolia. We calculated the Q _(10) values of soil respiration in the 11 communities, and then analyzed the sensitivity of Q _(10) to soil moisture content (0~20cm). Among the 11 communities, Q _(10) values varied from 1.47 to 1.84, with a mean value of 1.65 and a coefficient of variation of 6.94%. Using the Spearman's Rank-Order correlation method, we also analyze the relationship between Q _(10) values and soil moisture content, and found that Q _(10) values were positively correlated to average surface soil moisture ( R =0.64545, p =0.032), indicating that soil moisture significantly affected soil respiration. Our results showed that the spring wheat field had the greatest Q _(10) value (1.84), followed by the wet mixed grasses ( Q _(10)=1.78). Whereas, the Artemisia frigida -Potentilla acaulis community, had the lowest Q _(10) value (1.47). In the typical temperate steppe, soil temperature tends to have greater impact on soil respiration in wetter habitats than in drier habitats. This also implies that any significant change in the spatio-temporal pattern of soil moisture can have significant effects on soil respiration in the temperate steppe of China, and, therefore, the effect of soil moisture should be taken into account when soil CO_2 efflux is to be modeled on a larger spatial and temporal scale.
Keywords:CO_2 efflux  soil water content  spearman's correlation coefficient  Q _(10) value
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