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CO2浓度升高对森林土壤微生物呼吸与根(际)呼吸的影响
引用本文:周玉梅,韩士杰,郑俊强,辛丽花,张海森. CO2浓度升高对森林土壤微生物呼吸与根(际)呼吸的影响[J]. 植物生态学报, 2007, 31(3): 386-393. DOI: 10.17521/cjpe.2007.0047
作者姓名:周玉梅  韩士杰  郑俊强  辛丽花  张海森
作者单位:1 中国科学院沈阳应用生态研究所, 沈阳 110016; 2 沈阳农业大学, 沈阳 110061
基金项目:国家自然科学基金;国家自然科学基金;中国科学院知识创新工程项目
摘    要: 根呼吸与微生物呼吸的作用底物不同,二者对高浓度CO2的响应机理及敏感程度亦不同。在大气CO2浓度升高的背景下,精确区分根呼吸与微生物呼吸是构建森林生态系统碳循环模型和预测森林生态系统碳源/汇关系所必需的。根(际)呼吸与微生物呼吸对高浓度CO2的响应呈增加、降低或无明显变化等不同趋势,根(际)呼吸变化主要与根生物量明显相关,细根的作用大于粗根;土壤微生物呼吸变化存在较大的不确定性,微生物量和微生物活性与土壤微生物呼吸相关或不相关。根系统对高浓度CO2的响应会潜在地影响微生物的代谢底物,进而影响微生物呼吸强度。凡影响土壤总呼吸的生物与非生物因子都会直接或间接地影响根呼吸与土壤微生物呼吸。

关 键 词:2')"   href="  #"  >高浓度CO2  土壤呼吸  根际  土壤微生物
修稿时间:2006-06-19

EFFECTS OF ELEVATED CO2 CONCENTRATIONS ON SOIL MICROBIAL RESPIRATION AND ROOT/RHIZOSPHERE RESPIRATION IN FOREST SOIL
ZHOU Yu-Mei,HAN Shi-Jie,ZHENG Jun-Qiang,XIN Li-Hua,ZHANG Hai-Sen. EFFECTS OF ELEVATED CO2 CONCENTRATIONS ON SOIL MICROBIAL RESPIRATION AND ROOT/RHIZOSPHERE RESPIRATION IN FOREST SOIL[J]. Acta Phytoecologica Sinica, 2007, 31(3): 386-393. DOI: 10.17521/cjpe.2007.0047
Authors:ZHOU Yu-Mei  HAN Shi-Jie  ZHENG Jun-Qiang  XIN Li-Hua  ZHANG Hai-Sen
Affiliation:1 Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China; 2 Shenyang Agricultural University, Shenyang 110061, China
Abstract:Two main components of soil respiration, i.e., root/rhizosphere and microbial respirations, respond differently to elevated atmospheric CO2 concentrations both in mechanism and sensitivity because they have different substrates, derived from plant and soil organic matter, respectively. To model the carbon cycle and predict carbon source/sink of forest ecosystems, we must first understand the relative contributions of root/rhizosphere and microbial respirations to total soil respiration under elevated CO2 concentrations. Root/rhizosphere and soil microbial respirations have been shown to increase, decrease and remain unchanged under elevated CO2 concentrations. A significantly positive relationship between root biomass and root/rhizosphere respiration has been found. Fine roots respond more strongly to elevated CO2 concentrations than coarse roots. Evidence suggests that soil microbial respiration is highly variable and uncertain under elevated CO2 concentrations. Microbial biomass and activity are related or unrelated to rates of microbial respiration. Because substrate availability drives microbial metabolism in soil, it is likely that much of the variability in microbial respiration resulted from differences in the response of root growth to elevated CO2 and subsequent change in substrate production. Biotic and abiotic factors influencing soil respiration were found to affect both root/rhizosphere and microbial respirations.
Keywords:elevated CO_2 concentrations   soil respiration   rhizosphere   soil microorganism
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