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土壤呼吸对温度升高的适应
引用本文:陈全胜,李凌浩,韩兴国,董云社,王智平,熊小刚,阎志丹.土壤呼吸对温度升高的适应[J].生态学报,2004,24(11):2649-2655.
作者姓名:陈全胜  李凌浩  韩兴国  董云社  王智平  熊小刚  阎志丹
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:国家自然科学基金重点资助项目 ( 3 0 3 3 0 15 0 ),中国科学院知识创新工程重大资助项目 ( KZCX1-SW-0 1-0 4,KSCX1-0 8-0 3 ),国家重点基础研究发展规划资助项目 ( G2 0 0 0 0 1860 3,G19990 43 40 7)~~
摘    要:土壤呼吸是陆地生态系统碳循环的重要环节之一 ,其对温度升高的敏感程度在相当大的程度上决定着全球气候变化与碳循环之间的反馈关系。土壤呼吸对温度升高的适应是个比较普遍的现象 ,其表现形式主要为随着温度的持续升高和升温时间的延长 ,土壤呼吸对温度升高反应的敏感程度下降。产生这一现象的机制包括影响因子主导地位的转移和温度以外其他因子的协同变化。土壤呼吸对温度升高的适应可以视为碳循环对全球变暖的负反馈效应 ,它可能会在一定程度上缓和陆地生态系统对全球气候系统之间的耦合作用 ,并且导致土壤呼吸对全球温度升高响应的时空差异。由于目前生态系统模型多数没有考虑土壤呼吸的对温度升高的适应性 ,而采用统一的 Q1 0 值 ,其对未来土壤呼吸和未来气候变化幅度的预测可能存在偏差

关 键 词:土壤CO2排放  全球变暖  气候变化  Q10  温度敏感性  反馈效应
文章编号:1000-0933(2004)11-2649-07
收稿时间:3/4/2004 12:00:00 AM
修稿时间:2004/9/15 0:00:00

Acclimatization of soil respiration to warming
CHEN Quansheng,LI Linghao,HAN Xingguo,DONG Yunshe,WANG Zhiping,XIONG Xiaogang and YAN Zhidan.Acclimatization of soil respiration to warming[J].Acta Ecologica Sinica,2004,24(11):2649-2655.
Authors:CHEN Quansheng  LI Linghao  HAN Xingguo  DONG Yunshe  WANG Zhiping  XIONG Xiaogang and YAN Zhidan
Institution:Laboratory of Quantitative Vegetation Ecology; Institute of Botany; the Chinese Academy of Sciences; Beijing
Abstract:Soil respiration is an important component of carbon cycle of terrestrial ecosystem, and is usually driven by temperature. Feedback between carbon cycle and global climate change is mostly determined by the sensitivity of soil respiration to warming.. The sensitivity of soil respiration to warming declines when temperature continually increases, or warming keeps much longer, which is a common phenomenon known as acclimatization. Main mechanisms involve transfer between dominant factors and change of other factors with temperature. There are many factors other than temperature that could impose different effects on soil respiration under certain temperatures, such as water content, soil nutrient, roots, soil microorganism, etc.,, which could play dominant roles when temperature is high enough. Those factors usually change with temperature, e.g. when temperature increases or warming continues for a prolonged time, soil might become dryer, labile carbon might be decreased, activity of enzyme related to respiration of soil microorganism and roots might be reduced, allocation of photosynthetic production to belowground might be depressed. Acclimatization of soil respiration is a negative feedback of carbon cycle to global warming, which could mitigate the coupling of terrestrial ecosystem and global climate, i.e., CO_2 efflux from soil stimulated by warming would be restricted by the acclimatization in some degree. Because of acclimatization of soil respiration to warming, CO_2 flux from soil responding to global climate change is likely to be complex and highly variable spatially and temporally. Modeling is a necessary approach for predicting or simulating how ecosystem responds to climate change, but most of the currently used models do not take into account of the sensitivity of soil respiration to temperature. A fixed Q_(10) might result in large errors or biases when predicting CO_2 flux from soil and future climate conditions.
Keywords:soil CO_2 efflux  global warming  climate change  Q_(10)  sensitivity to temperature  feedback effect
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