摘要
利用静态箱-气相色谱法对华南丘陵区典型土地利用类型（针叶林：马尾松Pinus massoniana；果园：龙眼Dimocarpus longan Lour）地表CH4通量日变化进行了原位观测。结果表明，针叶林和果园土壤总体来说为大气CH4的吸收汇。地表CH4通量日变化波动较大，规律不明显。吸收较强的月份为10-11月，较弱的月份为6-9月。针叶林地表CH4吸收通量日平均值变化幅度为-0.093-0.066mg·m^-2·h-1，果园为-0.098-0.146mg·m^-2·h^-1。地温和气温对地表CH4通量无明显影响。降雨对地表CH4通量有较大的影响，早季（10-3月）地表CH4吸收通量大于雨季（4-9月）。凋落物和植被类型对CH4通量没有明显影响。
Diurnal variation of CH4 flux was measured using dark static chambers for 21 month in two typical land-use types in a hilly area of South China： plantation dominated by Pinus massoniana and orchard dominated by Dimocarpus Iongan Lout. There were two plots at both sites respectively： one was covered with litters on the surface soil and the other had no litters. The result showed that these two land-use types were sinks of CH4 to the atmosphere as a whole, but were the sources of CH4 occasionally in rainy season. Diurnal variations of CH4 fluctuated with no rule. Strong CH4 sink appeared in October and November and weak groin June to September. The average diurnal CH4 flux ranged from -0.093 - 0.066 mg·m^-2·h^-1 in the pine plantation and -0.098 - 0.146 mg·m^-2·h^-1 in the orchard. CH4 flux had no clear correlation with temperature. Precipitation affected CH4 flux greatly with higher flux in dry season （October--March） and lower in rainy season （April--September）. Litter layer and vegetation types had no distinct impact on CH4 uptake by soil.
出处
《生态环境》
CSCD
北大核心
2008年第3期1112-1115,共4页
Ecology and Environmnet
基金
中国科学院知识创新工程资助项目(KZCX-SW-01-01B-05,KSCX2-SW-133)
国家出青年科学基金项目(B类,30428022)
广东商学院引进人才科研启动项目(07YJRC22)
作者简介
刘惠（1972-），女，讲师，博士，从事植物生理生态学研究。E-mail：grleaf2008@yahoo．com．cn
通讯作者：赵平，研究员。E-mail：zhaoping@scib．ac．cn
