CO2浓度升高对森林土壤微生物呼吸与根（际）呼吸的影响

被引：16

作者：

周玉梅 ^{[1
]}

韩士杰 ^{[1
]}

郑俊强 ^{[1
]}

辛丽花 ^{[2
]}

张海森 ^{[1
]}

机构：

[1] 中国科学院沈阳应用生态研究所

[2] 沈阳农业大学

来源：

植物生态学报 | 2007年 / 03期

关键词：

高浓度CO2; 土壤呼吸; 根际; 土壤微生物;

D O I：

暂无

中图分类号：

S714 [森林土壤学];

学科分类号：

0903 ; 090301 ;

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。

引用

页码：386 / 393

页数：8

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