华北低山丘陵区土壤CH_4通量对脉冲降雨的响应  

Response of Soil CH_4 Fluxes on the Pulse Precipitation in Low Hilly Land of North China

作　　者：庄静静[1] 张劲松[1] 孟平[1] 郑宁[1] 王风芹[2] 贾长荣 李建中 

机构地区：[1]林木遗传育种国家重点实验室(中国林业科学研究院林业研究所),北京100091 [2]河南农业大学 [3]济源市国有大沟河林场

出　　处：《东北林业大学学报》2015年第10期72-78,共7页Journal of Northeast Forestry University

基　　金：国家林业公益性行业科研项目(201404206);"十二五"国家科技支撑计划项目(2015BAD07B02)

摘　　要：基于箱式—激光法的CH4通量自动观测系统(SF-3000)研究脉冲降雨对华北低山丘陵区刺槐人工林土壤CH4通量连续变化的影响。同步观测试验点地表以下5 cm深度处土壤温度(T5)及其土壤含水量(S5)、林内大气温度(Ta)和相对湿度(HR)以及总辐射(Ra)等气象因子。结果表明:降雨显著抑制了土壤CH4通量,这种抑制作用一般能维持几天左右。在降雨前,刺槐人工林土壤CH4通量的日变化表现出"V"型结构;而在降雨后,却较复杂,呈"W"和"V"型两种结构。在不同降雨强度影响下,土壤CH4通量在不同时期的差异显著,但各气象要素在不同时期差异显著不同。We studied the effects of rainfall on the CH4 fluxes of soil with box-laser in Robinia psedudoacia stands in low hilly areas of northern China. We also measured the surface soil moisture（ 5 cm）,surface soil temperature（ T5）,air temperature,relative humidity,and irradiation（ Ra） in the forest. The rainfall reduced the CH4 fluxes of forest soil,and the inhibition effect maintained several days. Before the rainfall,the daily CH4 fluxes characteristics showed a concave variation.After the rainfall,the variation of CH4 fluxes was complicated and showed diurnal characteristics of＂V-shape＂and＂W-shape＂.Under different rainfall intensities,although the CH4 fluxes of soil differed slightly in all meteorological elements,it differed significantly in different times.

关 键 词：脉冲降雨 全球气候变化 CH4通量 刺槐人工林 瞬态变化 

分 类 号：S718[农业科学—林学]