大豆和玉米生长对土壤N2O排放的影响

被引：15

作者：

杨兰芳 ^{[1
]}

蔡祖聪 ^{[1
]}

祁士华 ^{[2
]}

机构：

[1] 中国科学院土壤研究所土壤与农业可持续发展国家重点实验室

[2] 中国地质大学环境学院

来源：

作物学报 | 2007年 / 05期

基金：

中国科学院知识创新工程重大项目;

关键词：

大豆; 玉米; 生长; 土壤N2O排放; 气温;

D O I：

暂无

中图分类号：

S565.1 [大豆]; S513 [玉米（玉蜀黍）];

学科分类号：

摘要：

测定了盆栽试验条件下大豆和玉米生长期间的土壤N2O排放。种大豆土壤的N2O排放总量是相同条件下裸土排放总量的5.9倍,在大豆出苗后89 d里,种豆土壤的N2O排放平均速率显著低于裸土,此后种豆土壤的N2O排放速率显著高于裸土,种豆土壤N2O排放总量的93%发生在只占全生育期24%的成熟衰老期。种玉米土壤的N2O排放峰值出现在玉米出苗后13 d,而裸土的N2O排放峰值出现在玉米出苗后81 d,裸土的N2O排放总量是种玉米土壤N2O排放总量的13.5倍;种玉米土壤N2O排放主要发生在前一半时期里,而裸土的N2O排放主要发生在后一半时期里。无论在大豆还是玉米生长期间,裸土的N2O排放速率均与气温呈极显著的正指数相关,而种豆土壤的N2O排放速率与气温呈极显著的负相关,种玉米土壤的N2O排放速率与气温没有显著相关性。由此可见,植物生长和植物类型不仅影响土壤N2O排放的数量,也影响土壤N2O排放与温度之间关系。

引用

页码：861 / 865

页数：5

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