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	Phosphorus and carbon competitive sorption-desorption and associated non-point loss respond to natural rainfall events
	Tian J.; Gao Y.
	2014
关键词	Agricultural fertilizers Leaching Carbon Phosphorus Competitive sorption-desorption organic-matter southwestern china humic substances purple soil phosphate management dynamics release water availability
英文摘要	Long-term application of fertilizer or manure can increase the potential for P loss risk to ground and surface waters due to C and P competitive sorption-desorption. The aim of this study was to investigate the effect of long-term agricultural fertilizer application on dissolved organic carbon (DOC) and dissolved total phosphorus (DTP) loss. The study was conducted at the Yanting Agro-Ecological Experimental Station in Sichuan Province, People's Republic of China, during the 2012 rainy season. The results show that the variations in C and P leaching effects in fertilized soils exposed to natural rainfall events. As expected, application of inorganic and organic fertilizers increases DOC and DTP concentrations in soil and decreases the C:P ratio. Similarly, application of inorganic and organic fertilizers results in greater C and P leaching than that seen in unfertilized soils. The DOC flux was higher in subsurface runoff than in overland flow. In contrast, overland flow was the main pathway for P transport; subsurface runoff accounted for a smaller proportion of the total P transport. The increase of DOC and DTP was higher after use of organic manures than after treatment with inorganic fertilizers. DOC derived from surface-applied organic manures was found to leach at higher rates than that seen for DTP derived from the same source. However, organic manure-derived DOC was found to transport from soil prior to P, when they are surface-applied, demonstrating a higher sorption affinity of P over DOC compared to inorganic fertilization. Therefore, we should pay more attention to the P mobilized through long-term fertilization and enhance the P uptake due to C and P competitive sorption-desorption, and avoid potential leaching loss of P during rainfall process. (C) 2014 Elsevier B.V. All rights reserved.
出处	Journal of Hydrology
卷	517
页	447-457
收录类别	SCI
语种	英语
ISSN号	0022-1694
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/29874]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	Tian J.,Gao Y.. Phosphorus and carbon competitive sorption-desorption and associated non-point loss respond to natural rainfall events. 2014.

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