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西北干旱区两种不同栽培管理措施下棉田CH4和N2O排放通量研究/CH4 AND N2O FLUXES FROM COTTON FIELDS DIFFERENT IN FARMING PRACTICES IN NORTHWESTERN CHINA[J]
Authors
Lai Dongmei
Li Zhiguo
+12 more
Tian Changyan
Yan Zhengyue
Zhang Runhua
中国科学院武汉植物园,武汉 430074
张润花
李志国
武汉市蔬菜科学研究所,武汉,430065
田长彦
荒漠与绿洲生态国家重点实验室,阜康生态试验站,中国科学院新疆生态与地理研究所,乌鲁木齐 830011
赖冬梅
闫正跃
防城港出人境检验检疫局,广西防城港,538001
Publication date
1 January 2012
Publisher
Abstract
采用静态箱-气相色谱法对西北干旱区当前普遍采用的膜下滴灌和传统的无膜漫灌两种栽培管理下土壤CH4和N2O通量日变化和季节变化特征进行了研究.结果表明,随时间的推移,无膜漫灌栽培管理措施下棉田土壤CH4日变化通量呈先降后升趋势,而膜下滴灌栽培处理CH4排放通量日变化则呈现先升后降趋势;在整个生长季节,无膜漫灌和膜下滴灌土壤CH4季节变化规律不太明显,前者吸收大气CH4 45.2~52.5 mgm-2 a-1,后者释放CH4通量为0.7~23.1 mg m-2 a-1.两种栽培管理措施下棉田土壤N2O通量的日变化和季节变化均随时间的推移均呈现先升后降趋势,但是,无膜漫灌日均排放N2O通量显著高于膜下滴灌.在整个生长季节,无膜漫灌土壤N2O释放量(N2O 99.3~320.0 mg m-2a-1)显著高于膜下滴灌(N2O 60.0~259.0 mgm-2a-1).以上结果说明,膜下滴灌栽培管理措施可以改变旱田传统无膜漫灌栽培土壤与大气CH4的交换方向,促进土壤CH4向大气的排放,但对N2O通量日变化和季节变化规律不产生影响,显著降低土壤N2O的排放量
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Last time updated on 29/11/2016