EFFECT OF CARBON AVAILABILITY ON MICROBIAL ACTIVITIES IN Calamagrostis angustifolia SOIL
- 出版年：2004
- 作者：XU Xiao-Feng；SONG Chang-Chun； SONG Xia；YANG Huai-Hui
- 单位1：Northeast Institute of Geography and Agricultural Ecology；CAS；Changchun
- 出生年：1979
- 语种：中文
- 作者关键词：carbon availability index；microbial activity amagrostis anguslifozis ； San]lnag Plain
- 起始页：68
- 总页数：6
- 刊名：湿地科学
- 是否内版：否
- 刊频：季刊
- 创刊时间：2003
- 主办单位：中国科学院东北地理与农业生态研究所
- 主编：陈宜瑜
- 电子信箱：wetlands@ mail. mneigae. ac. Cn
- 卷：2
- 期：1
摘要
Carbon availability varies very much along soil profile and deereases from topsoil to subsoil. The effect ofcarbon availahility index （CAI） on microbial activities in Calamagrostis angustifolia soil in the Saniag Plain in theNortheast China was measured. Based on the proposal about CAI and microbial respiration from Parkinson and Coleman(1999) , the resuits showed that carbon availability lmits the microblal activities in topsoil, root layer soil and subsoilinitrally, whhereas it does not limit the microbial activity after 1.5 hincubation for recovery from the disturbance inphysical, chemical and biology structure resulting from sampling, then after 5h incubation carbon availability lmits in1crobial activity again after the labile carbon was mineralized. At the same time the soil organic matter affects the carbonavailability significantly when it is lower than 10%, but little when the soil organic matter is higher than 10%. Themicrobial biomass carbon is linearly related to carbon availabiliy in the Calamagrostis angustifolia soil. When the CAIis lower than 0.85, the β-glucosidase activity increases along with CAI, but decreases when CAI is larger than 0.85.