植物生长季退化草毡寒冻雏形土CO_2释放特征  

CO_2 flux characteristics from degenerated mat cryo-sod soil during plant growing period.

作　　者：周党卫[1] 曹广民[1] 张金霞[1] 赵新全[1] 周兴民[1] 

机构地区：[1]中国科学院西北高原生物研究所,西宁810001

出　　处：《应用生态学报》2003年第3期367-371,共5页Chinese Journal of Applied Ecology

基　　金：国家重点基础研究发展规划项目 (G19980 40 80 0 );国家自然科学基金项目 (3 0 0 70 14 7);中国科学院知识创新工程重大项目 (KZCX1SW 0 1 0 1);中国科学院知识创新方向资助项目 (KSCXZ 1 0 7)

摘　　要：对中国科学院海北高寒草甸生态系统定位站地区退化草毡寒冻雏形土CO2 释放的全天候连续观测结果表明 ,退化草毡寒冻雏形土CO2 的释放有明显的日变化和季节动态 ,日最大释放速率出现于12∶0 0～ 14∶0 0 ,最小释放速率出现于 6∶0 0～ 8∶0 0 ;植物生长季的最大振幅为 4 6 2 .4 9mg·m-2 ·h-1(8月 18日 ) ,最小振幅为 114 .97mg·m-2 ·h-1(5月 9日 ) ,CO2 释放速率白天大于夜晚 .不同物候期CO2 释放速率亦不同 ,草盛期 >枯黄期 >返青期 .最大日均值为 4 80 .76mg·m-2 ·h-1(8月 18日 ) ,最小日均值为 14 0 .77mg·m-2 ·h-1(5月 9日 ) .释放速率与气温、地表温度及土壤 5cm地温均呈显著或极显著相关关系 ,表明温度是决定CO2The carbon dioxide (CO 2) emission rate was studied in the degenerated mat cryo sod soil covered with alpine Kobresia humilis meadow at the Haibei alpine meadow ecosystem research station, with CID 301ps CO 2 analytical instrument during plant growth period (May-Sep, in 1998). The results showed that the CO 2 emission rate had obvious daily variation and seasonal dynamics. The maximum rate of CO 2 emission appeared at 12∶00～ 14∶00, and the minimum rate appeared at 6∶00～8∶00. The max daily amplitude was 462.49 mg·m -2 ·h -1 ,while the minimum daily amplitude was 114.97 mg·m -2 ·h -1 .The CO 2 emission rate varied with phonological periods, and the order was exuberance>withering>green up. The maximum daily average value was 480.76 mg·m -2 ·h -1 (Aug.18th), and the minimum daily average value was 140.77 mg·m -2 ·h -1 (May.9th). Correlation analysis showed that there was a significant relationship between CO 2 emission rate and air temperature, soil surface temperature and soil temperature in 5 cm, 10 cm, 15 cm, 20 cm,and 30 cm. Temperature was the dominant factor that affected the CO 2 emission rate in degenerated mat cryo sod soil.

关 键 词：退化 草毡寒冻雏形土 CO2释放速率 季节变化 日变化 

分 类 号：X173[环境科学与工程—环境科学]