气候变化领域集成服务门户(CCPortal): Soil carbon sequestration efficiency under continuous paddy rice cultivation and excessive nitrogen fertilization in South China

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DOI	10.1016/j.still.2021.105108
	Soil carbon sequestration efficiency under continuous paddy rice cultivation and excessive nitrogen fertilization in South China
	Hu, Yueming; Wang, Lu; Chen, Feixiang; Ren, Xiangning; Tan, Zhengxi
通讯作者	Wang, L ; Tan, ZX (通讯作者)，417 Shougouling Rd, Guangzhou 510610, Peoples R China.
发表日期	2021
ISSN	0167-1987
EISSN	1879-3444
卷号	213
英文摘要	Long-term excessive applications of chemical fertilizers may result in adverse impacts on soil functions. This study was to evaluate soil organic carbon (SOC) sequestration efficiency under continuous paddy rice cultivation with an excessive nitrogen (N) fertilization over the period from1980 to 2017 in South China. The SOC and total nitrogen (TN) of total 108 soil samples from continuous paddy soils and new paddy soils collected in 2017 were accordingly compared with those of 54 samples from paddy soils and upland soils obtained in 1980. Results show a total SOC increase of 0.79 g kg-1 from the initial content of 12.82 g kg-1 over a 37-year period despite an increased input of about 550 kg N ha(-1)yr(-1 )from fertilizers and 2000 kg C kg(-1) yr(-1) from all straw incorporation after 1990. This small C sequestration rate (or 0.021 g C kg(-1) yr(-1)) was also observed to couple with a significantly elevated C:N ratio and badly weakened SOC-N correlation as of 2017, which is almost impossible to be revealed by normal fertilization experiments. The SOC sequestration rate of 0.145 g C kg(-1) yr(-1) of the new paddy soils that were developed from uplands since 1980 implies a declining tendency of SOC sequestration efficiency with rice cultivation time, which could be mainly attributed to both low soil N content and microbial activity rather than to SOC saturation. This case reminds of a need for more dedicated plot studies coupled with field observations on farmers' routine fertilization practices to elucidate why the low soil N content remains with an excessive N fertilizer input and how N interacts with SOC in the continuous paddy soils.
关键词	LONG-TERM FERTILIZATION ORGANIC-MATTER STABILIZATION ACCUMULATION INPUT SATURATION MANAGEMENT DYNAMICS SYSTEMS UPLAND
英文关键词	Paddy soil; Rice straw residue; Soil microbial activity; Soil nitrogen; Soil organic carbon
语种	英语
WOS研究方向	Agriculture
WOS类目	Soil Science
WOS记录号	WOS:000687973000008
来源期刊	SOIL & TILLAGE RESEARCH
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/254619
作者单位	[Hu, Yueming; Wang, Lu; Chen, Feixiang; Ren, Xiangning] South China Agr Univ, Coll Nat Resources & Environm, Guangzhou 510642, Peoples R China; [Hu, Yueming; Chen, Feixiang; Ren, Xiangning; Tan, Zhengxi] South China Acad Nat Resources Sci & Technol, Guangzhou 510610, Peoples R China; [Hu, Yueming; Wang, Lu] Hainan Univ, Haikou 570228, Hainan, Peoples R China; [Hu, Yueming] Chinese Acad Sci, Northwest Inst Plateau Biol, Key Lab Restorat Ecol Cold Area Qinghai Prov, Xining 810008, Peoples R China
推荐引用方式 GB/T 7714	Hu, Yueming,Wang, Lu,Chen, Feixiang,et al. Soil carbon sequestration efficiency under continuous paddy rice cultivation and excessive nitrogen fertilization in South China[J]. 中国科学院西北生态环境资源研究院,2021,213.
APA	Hu, Yueming,Wang, Lu,Chen, Feixiang,Ren, Xiangning,&Tan, Zhengxi.(2021).Soil carbon sequestration efficiency under continuous paddy rice cultivation and excessive nitrogen fertilization in South China.SOIL & TILLAGE RESEARCH,213.
MLA	Hu, Yueming,et al."Soil carbon sequestration efficiency under continuous paddy rice cultivation and excessive nitrogen fertilization in South China".SOIL & TILLAGE RESEARCH 213(2021).