Nitrous oxide emissions from paddy soil in three rice-based cropping systems in China

被引：60

作者：

Xing, GX ^{[1
]}

Shi, SL ^{[1
]}

Shen, GY ^{[1
]}

Du, LJ ^{[1
]}

Xiong, ZQ ^{[1
]}

机构：

[1] Acad Sinica, Inst Soil Sci, Nanjing 210008, Peoples R China

来源：

NUTRIENT CYCLING IN AGROECOSYSTEMS | 2002年 / 64卷 / 1-2期

关键词：

cropping system; N2O emission; paddy; water regime;

D O I：

10.1023/A:1021131722165

中图分类号：

S15 [土壤学];

学科分类号：

0903 ; 090301 ;

摘要：

Rice-flooding fallow, rice-wheat, and double rice-wheat systems were adopted in pot experiment in an annual rotation to investigate the effects of cropping system on N2O emission from rice-based cropping systems. The annual N2O emission from the rice-wheat and the double rice-wheat cropping systems were 4.3 kg N ha(-1) and 3.9 kg N ha(-1), respectively, higher than that from rice-flooding fallow cropping system, 1.4 kg N ha(-1). The average N2O flux was 115 and 118 mug N m(-2) h(-1) for rice season in rice-wheat system and early rice season in double rice-wheat system, respectively, 68.6 and 35.3 mug N m(-2) h(-1) for the late rice season in double rice-wheat system and rice season in rice-flooding fallow, respectively, and only 3.1-5.3 mug N m(-2) h(-1) for winter wheat or flooding fallow season. Temporal variations of N2O emission during rice growing seasons differed and high N2O emission occurred when soil conditions changed from upland crop to flooded rice.

引用

页码：135 / 143

页数：9

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