中国森林土壤呼吸模式  

Regional patterns of soil respiration in China's forests

作　　者：陈光水[1] 杨玉盛[1] 吕萍萍[1] 张亿萍[1] 钱小兰[1] 

机构地区：[1]福建省亚热带资源与环境蘑点实验室,福建师范大学地理科学学院,福州350007

出　　处：《生态学报》2008年第4期1748-1761,共14页Acta Ecologica Sinica

基　　金：国家自然科学基金资助项目(30300272)~~

摘　　要：通过收集国内62个森林样地的土壤呼吸及相关因子数据,分析中国森林土壤呼吸模式。结果表明,中国森林土壤呼吸年通量与年均气温、年均降水量、年凋落物量和年地上净生产力均呈显著的线性正相关,土壤呼吸的Q10则与年均气温和年均降水量均呈显著的负相关。根系呼吸、枯枝落叶层呼吸与土壤呼吸间均呈显著线性正相关;土壤异养呼吸和枯枝落叶层呼吸与年凋落物量呈显著正相关;土壤异养呼吸与自养呼吸间呈显著的线性正相关。根系呼吸、枯枝落叶层呼吸、矿质土壤呼吸占土壤呼吸的比例均值分别为34.7%、20.2%和50.2%。矿质土壤呼吸所占比例与气温和降水量呈显著负相关,而异养呼吸所占比例则与降水量呈显著负相关。根系呼吸所占比例与根系呼吸之间呈渐近线关系(渐近值为45.9%)。Regional patterns of soil respiration in China＇ s forests were analysed using published data from 62 plots. Rates of soil respiration were found significantly correlated to mean annual air temperature, mean annual precipitation, annual aboveground litterfall and aboveground net primary production. Ql0 values of soil respiration showed significant negative correlations to mean annual air temperature and mean annual precipitation. Root respiration and litter respiration were found positively correlated to soil respiration, and soil heterotrophic respiration and litter respiration positively correlated to litterfall. Soil hetero- and autotrophic respiration were found positively correlated. Contributions of root respiration, litter respiration and mineral soil respiration to soil respiration averaged 34. 7%, 20. 2% and 50. 2%, respectively. The contribution of mineral soil respiration to soil respiration showed negatively correlated to mean air temperature and annual rainfall, and contribution of heterotrophic respiration negatively correlated to annual rainfall. Root contribution to soil respiration increased initially and then gradually steady with increase in root respiration, following a symptotic curve with the limit value of 45.9%.

关 键 词：森林 土壤呼吸 Q10值 根系呼吸 矿质土壤呼吸 枯枝落叶层呼吸 异养呼吸 

分 类 号：S714[农业科学—林学]