Nutrient export via overland flow from a cultivated field of an Ultisol;in southern China

doi:10.1002/hyp.9270

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	Nutrient export via overland flow from a cultivated field of an Ultisol;in southern China
	Wei, Linhong 4; Cheng, Xunqiang 1; Cai, Yuanfeng 2
刊名	HYDROLOGICAL PROCESSES
	2013
卷号	27 期号:3 页码:421-432
关键词	overland flow nutrients hydrological paths land use agricultural catchment
ISSN号	1099-1085
DOI	10.1002/hyp.9270
英文摘要	Understanding the influence of complex interactions among hydrological factors, soil characteristics and biogeochemical functions on nutrient dynamics in overland flow is important for efficiently managing agricultural nonpoint pollution. Experiments were conducted to assess nutrient export from Ultisol soils in the Sunjia catchment, Jiangxi province, southern China, between 2003 and 2005. Four plots were divided into two groups: two peanut plots and two agroforestry (peanut intercropped with citrus) plots. During the study period, we collected water samples for chemical analyses after each rainfall event that generated overland flow to assess nutrient export dynamics.;The concentrations of potassium (K) and nitrate-N (NO3--N) in overland flow were higher during the wetting season (winter and early spring). This reflects the solubility of K and NO3--N, the accumulation of NO3--N during the dry season and an increase in desorption processes and mixing with pre-event water caused by prolonged contact with soil in areas with long-duration, low-intensity rainfall. In contrast, concentrations of total nitrogen (TN) and total phosphorus (TP) were higher during the wet season (late March to early July) and during the dry season (mid-July to the end of September or early October). This was due to the interaction between specific hydrological regimes, the properties of the Ultisol and particulate transport processes. Variations in nutrient concentrations during storm events further identified that event water was the dominant source of total nitrogen and total phosphorus, and pre-event water was the dominant source of NO3-N. In addition, the results obtained for the different land uses suggest that agroforestry practices reduce nutrient loss via overland flow. Copyright (C) 2012 John Wiley & Sons, Ltd.
学科主题	环境地质学
WOS关键词	ANTECEDENT MOISTURE CONDITIONS ; DISSOLVED ORGANIC-CARBON ; BIOAVAILABLE ; PHOSPHORUS ; MICROBIAL CONTRIBUTIONS ; AGRICULTURAL CATCHMENT ; SOIL-MOISTURE ; SURFACE-WATER ; NITROGEN ; RUNOFF ; RIVER
WOS研究方向	Water Resources
语种	英语
出版者	WILEY-BLACKWELL
WOS记录号	WOS:000313989000010
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/39946]
专题	中国地质调查局南京地质调查中心
作者单位	1.China Geol Survey, Nanjing Ctr, Nanjing 210016, Peoples R China. 2.Chinese Acad Sci, Inst Mt Hazards & Environm, Chengdu 610041, Peoples R China. 3.Nanjing Univ, Sch Earth Sci & Engn, Nanjing 210093, Jiangsu, Peoples R China. 4.中国地质调查局南京地质调查中心
推荐引用方式 GB/T 7714	Wei, Linhong,Cheng, Xunqiang,Cai, Yuanfeng. Nutrient export via overland flow from a cultivated field of an Ultisol;in southern China[J]. HYDROLOGICAL PROCESSES,2013,27(3):421-432.
APA	Wei, Linhong,Cheng, Xunqiang,&Cai, Yuanfeng.(2013).Nutrient export via overland flow from a cultivated field of an Ultisol;in southern China.HYDROLOGICAL PROCESSES,27(3),421-432.
MLA	Wei, Linhong,et al."Nutrient export via overland flow from a cultivated field of an Ultisol;in southern China".HYDROLOGICAL PROCESSES 27.3(2013):421-432.