干旱区生态环境知识资源中心(Arid): Gross nitrogen transformations and N_2O emission sources in sandy loam and silt loam soils

Arid

	Gross nitrogen transformations and N_2O emission sources in sandy loam and silt loam soils
	Lang Man; Li Ping; Wei Wei
来源期刊	干旱区科学
ISSN	1674-6767
出版年	2021
卷号	13 期号:5 页码:1674-6767
英文摘要	The soil type is a key factor influencing N (nitrogen) cycling in soil; however, gross N transformations and N_2O emission sources are still poorly understood. In this study, a laboratory 15N tracing experiment was carried out at 60% WHC (water holding capacity) and 25C to evaluate the gross N transformation rates and N_2O emission pathways in sandy loam and silt loam soils in a semi-arid region of Heilongjiang Province, China. The results showed that the gross rates of N mineralization, immobilization, and nitrification were 3.60, 1.90, and 5.63 mg N/(kg·d) in silt loam soil, respectively, which were 3.62, 4.26, and 3.13 times those in sandy loam soil, respectively. The ratios of the gross nitrification rate to the ammonium immobilization rate (n/ia) in sandy loam soil and silt loam soil were all higher than 1.00, whereas the n/ia in sandy loam soil (4.36) was significantly higher than that in silt loam soil (3.08). This result indicated that the ability of sandy loam soil to release and conserve the available N was relatively poor in comparison with silt loam soil, and the relatively strong nitrification rate compared to the immobilization rate may lead to N loss through NO_3~- leaching. Under aerobic conditions, both nitrification and denitrification made contributions to N_2O emissions. Nitrification was the dominant pathway leading to N_2O production in soils and was responsible for 82.0% of the total emitted N_2O in sandy loam soil, which was significantly higher than that in silt loam soil (71.7%). However, the average contribution of denitrification to total N_2O production in sandy loam soil was 17.9%, which was significantly lower than that in silt loam soil (28.3%). These results are valuable for developing reasonable fertilization management and proposing effective greenhouse gas mitigation strategies in different soil types in semiarid regions.
英文关键词	gross N transformation rates 15N tracing N_2O emission sources sandy loam silt loam semi-arid region
类型	Article
语种	英语
国家	中国
收录类别	CSCD
WOS类目	Environmental Sciences & Ecology
CSCD记录号	CSCD:6980215
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/365048
作者单位	Lang Man, Nanjing University of Information Science & Technology;;Department of Agricultural Resources and Environment, Nanjing University of Information Science & Technology, Jiangsu Key Laboratory of Agricultural Meteorology;;, Nanjing;;Nanjing, ;; 210044;;210044.; Li Ping, Nanjing University of Information Science & Technology;;Department of Agricultural Resources and Environment, Nanjing University of Information Science & Technology, Jiangsu Key Laboratory of Agricultural Meteorology;;, Nanjing;;Nanjing, ;; 210044;;210044.; Wei Wei, Nanjing University of Information Science & Technology;;Department of Agricultural Resources and Environment, Nanjing University of Information Science & Technology, Jiangsu Key Laboratory of Agricultural Meteorology;;, Nanjing;;Nanjing, ;; 210044;;210044.
推荐引用方式 GB/T 7714	Lang Man,Li Ping,Wei Wei. Gross nitrogen transformations and N_2O emission sources in sandy loam and silt loam soils[J],2021,13(5):1674-6767.
APA	Lang Man,Li Ping,&Wei Wei.(2021).Gross nitrogen transformations and N_2O emission sources in sandy loam and silt loam soils.干旱区科学,13(5),1674-6767.
MLA	Lang Man,et al."Gross nitrogen transformations and N_2O emission sources in sandy loam and silt loam soils".干旱区科学 13.5(2021):1674-6767.