格氏栲天然林和人工林土壤呼吸对干湿交替的响应  

Responses of soil respiration to soil rewetting in a natural forest and two monoculture plantations in subtropical China

作　　者：杨玉盛[1] 陈光水[1] 董彬[2] 王小国[2] 谢锦升[2] 李灵[2] 卢豪良[2] 

机构地区：[1]福建师范大学地理科学学院,福州350007 [2]福建农林大学林学院,南平353001

出　　处：《生态学报》2004年第5期953-958,共6页Acta Ecologica Sinica

基　　金：教育部高校优秀青年教师教学科研奖励计划资助项目 ;福建省基础研究重大资助项目 ( 2 0 0 0 -F-0 0 4)~~

摘　　要：通过室外定位观测前期连续干旱情况下天然降雨及室内模拟不同温度 (10℃、19℃和 2 8℃ )下测定格氏栲天然林、格氏栲人工林和杉木人工林土壤增湿后呼吸动态 ,探讨不同林型土壤呼吸对土壤干湿交替的响应。结果发现室外定位观测和室内模拟试验均出现了增湿后土壤呼吸骤升至最大值及随后逐渐衰减的现象 ,且这种变化可由时间过程模型 (R=ate- bt+c)较好地进行拟合。温度升高提升了土壤呼吸对干湿交替的响应值 RV。格氏栲天然林土壤呼吸对干湿交替的响应对温度最为敏感 ,随温度升高其响应指数 RE增加 ;杉木林土壤呼吸对干湿交替的响应指数 RE最高 ,且对土壤水分变化最敏感 ,但随温度升高超过一定限度后其响应指数The “inspiration” of soil respiration due to soil rewetting might not be ignorable and should be included in calculating of the annual soil CO_2 efflux. The effect of soil rewetting on soil respiration was determined in field of a natural forest of Castanopsis kawakamii (NF), a C. kawakamii plantation forest (CK), and a Chinese fir (Cunninghamia lanceolata) (CF) plantation forest in Sanming Nature Reserve, Fujian, China, and in laboratory at different temperature of 10℃, 19℃ and 28℃ with soil rewetting. The research, not only in the field, but also in the laboratory, found an increase of soil respiration and an subsequent decline after reaching a maximum following soil rewetting. This process can be simulated by a time model: R=ate^(-bt)+c. Higher temperature can increase the response value (E). The response of soil respiration in NF to soil rewetting showed the highest sensitive to temperature, the higher response efficiency with higher temperature. Soil respiration in CF had the highest response efficiency and the highest sensitive to soil water content, but temperature have an negative effect on its response efficiency. It was concluded that the inspiration effect of soil respiration following soil rewetting could contribute to a ignorable part of total soil CO_2 efflux on the annual basis, given the fact that there are high frequence of rain events in the local area.

关 键 词：土壤呼吸 干湿交替 土壤温度 天然林 人工林 

分 类 号：S714[农业科学—林学]