摘要
采用静态箱法 ,于 1998年 7月至 2 0 0 0年 2月对放牧条件下锡林河流域冷蒿 (Artemisia frigida) -小禾草草原甲烷地 -气交换通量进行了野外原位测定。研究结果表明 :锡林河流域草原是甲烷的弱汇 ,其吸收通量变幅较大 ,在0～ 499.6 8μg.m- 2 .h- 1之间 ,且具有明显的季节变化特征 ,表现为甲烷通量随温度的降低而逐渐降低。分析揭示了甲烷通量与温度和降水之间的关系 ,尤其是与地温之间的定量关系。两年的研究结果还表明 ,不同放牧率处理在一定的时间尺度上对土壤 -植被系统吸收甲烷没有显著影响。
In situ CH 4 flux between soil and atmosphere in an Artemisia frigida short bunchgrass steppe of Xilin River Basin was measured under different grazing intensities using a closed chamber technique between July, 1998 and February 2000. We found that over this period the steppe community was a light sink of atmospheric CH 4, and that CH 4 flux varied greatly from 0 to 500 μg·m -2 ·h -1 . An important feature of this variation was seasonal in that the flux became reduced in declining temperatures. Analysis revealed a correlation between CH 4 flux and precipitation and temperature, especially ground temperature. Data from these two years of study also show that different grazing intensities had no significant impact on the consumption of CH 4 by the soil vegetation system at a certain time scale.
出处
《植物生态学报》
CAS
CSCD
北大核心
2000年第6期693-696,共4页
Chinese Journal of Plant Ecology
基金
国家自然科学基金资助项目!(49790 0 2 0 -0 5 )
