滩地美洲黑杨人工林皆伐对地表甲烷通量的短期影响  

Short-Term Effects of Clear-Cutting of Populus deltoides Plantation on Methane Flux on the Beach Land of Yangtze River

作　　者：高升华[1] 张旭东[1] 汤玉喜[2] 张蕊[1] 唐洁[2] 张雷[1] 申贵仓[1] 魏远[1] 

机构地区：[1]中国林业科学研究院林业研究所林木遗传育种国家重点实验室,北京100091 [2]湖南省林业科学院,长沙410004

出　　处：《林业科学》2013年第1期7-13,共7页Scientia Silvae Sinicae

基　　金："十二五"农村领域国家科技计划课题( 2011BAD38B0405)

摘　　要：2011年4—7月,利用静态箱-快速甲烷分析仪(FMA)法,在岳阳市君山区长江外滩美洲黑杨人工成熟林对比观测皆伐区和未采伐区地表甲烷通量,结合同步观测的土壤温度、湿度和植被结构因子,分析皆伐对试验区地表甲烷汇功能影响的原因。结果表明: 滩地美洲黑杨人工林土壤在未遭遇水淹年份( 2011) 生长旺季为甲烷的汇; 2 次观测显示,皆伐区的甲烷吸收速率均显著( P<0.001和P<0.05) 低于未采伐区,分别仅为未采伐区的29%和22% ,且皆伐改变了甲烷通量的日变化规律; 皆伐导致土壤温度、湿度和植被结构等环境因子发生的变化共同导致了皆伐区甲烷汇功能的显著下降。This study aimed at investigating effects of the clear-cutting on methane flux. The study was carried out in the beach of Yangtze River in Junshan, Yueyang City, and the data of methane flux was collected with static chamber - FMA （fast methane analyzer） approach. Compared observations of methane flux and the environmental factors （soil temperature, soil water content and herbaceous vegetation） were carried out in the clear-cut field and uncut field. The result showed that the whole area was a sink of methane in the fast growing seasons in unflooded year, and that clear-cutting leaded to significant （P 〈0. 001 and P 〈 0. 05） declines of methane uptake rates. Twice observations showed that the rates in the clear-cut field were only 29% and 22% of the uncut field in the early two months after clear-cutting, respectively. The clear-cutting also changed diurnal pattern of methane uptake rates. The clear-cutting significantly reduced methane sink probably through the clear-cutting induced changes in soil temperature, soil water content, and the vegetations.

关 键 词：甲烷通量 皆伐 美洲黑杨人工林 快速甲烷分析仪 静态箱 长江滩地 

分 类 号：S154.1[农业科学—土壤学] S716.3[农业科学—农业基础科学]