Modeling nitrogen loading in a small watershed in southwest China using a DNDC model with hydrological enhancements

CORC > 成都山地灾害与环境研究所 > 中国科学院水利部成都山地灾害与环境研究所 > 山地表生过程与生态调控重点实验室

	Modeling nitrogen loading in a small watershed in southwest China using a DNDC model with hydrological enhancements
	Deng, J.2; Zhou, Z.2; Zhu, B.1 ; Zheng, X.2; Li, C.3; Wang, X.1; Jian, Z.1
刊名	BIOGEOSCIENCES
	2011
卷号	8 期号:10 页码:2999-3009
关键词	AQUATIC ECOSYSTEMS CARBON DYNAMICS RAINFALL EVENTS OXIDE EVOLUTION SOIL DRIVEN DRAINAGE SCALE RIVER VALIDATION POLLUTION
ISSN号	1726-4170
通讯作者	Zhu, B （朱波）
英文摘要	The degradation of water quality has been observed worldwide, and inputs of nitrogen (N), along with other nutrients, play a key role in the process of contamination. The quantification of N loading from non-point sources at a watershed scale has long been a challenge. Process-based models have been developed to address this problem. Because N loading from non-point sources result from interactions between biogeochemical and hydrological processes, a model framework must include both types of processes if it is to be useful. This paper reports the results of a study in which we integrated two fundamental hydrologic features, the SCS (Soil Conservation Service) curve function and the MUSLE (Modified Universal Soil Loss), into a biogeochemical model, the DNDC. The SCS curve equation and the MUSLE are widely used in hydrological models for calculating surface runoff and soil erosion. Equipped with the new added hydrologic features, DNDC was substantially enhanced with the new capacity of simulating both vertical and horizontal movements of water and N at a watershed scale. A long-term experimental watershed in Southwest China was selected to test the new version of the DNDC. The target watershed's 35.1 ha of territory encompass 19.3 ha of croplands, 11.0 ha of forest lands, 1.1 ha of grassplots, and 3.7 ha of residential areas. An input database containing topographic data, meteorological conditions, soil properties, vegetation information, and management applications was established and linked to the enhanced DNDC. Driven by the input database, the DNDC simulated the surface runoff flow, the subsurface leaching flow, the soil erosion, and the N loadings from the target watershed. The modeled water flow, sediment yield, and N loading from the entire watershed were compared with observations from the watershed and yielded encouraging results. The sources of N loading were identified by using the results of the model. In 2008, the modeled runoff-induced loss of total N from the watershed was 904 kg Nyr(-1), of which approximately 67% came from the croplands. The enhanced DNDC model also estimated the watershed-scale N losses (1391 kg Nyr(-1)) from the emissions of the N-containing gases (ammonia, nitrous oxide, nitric oxide, and dinitrogen). Ammonia volatilization (1299 kg Nyr(-1)) dominated the gaseous N losses. The study indicated that process-based biogeochemical models such as the DNDC could contribute more effectively to watershed N loading studies if the hydrological components of the models were appropriately enhanced.
WOS标题词	Science & Technology ; Life Sciences & Biomedicine ; Physical Sciences
类目[WOS]	Ecology ; Geosciences, Multidisciplinary
研究领域[WOS]	Environmental Sciences & Ecology ; Geology
关键词[WOS]	AQUATIC ECOSYSTEMS ; CARBON DYNAMICS ; RAINFALL EVENTS ; OXIDE EVOLUTION ; SOIL DRIVEN ; DRAINAGE ; SCALE ; RIVER ; VALIDATION ; POLLUTION
收录类别	SCI
语种	英语
WOS记录号	WOS:000296747000015
公开日期	2013-06-25
内容类型	期刊论文
源URL	[http://ir.imde.ac.cn/handle/131551/5530]
专题	成都山地灾害与环境研究所_山地表生过程与生态调控重点实验室
作者单位	1.Chinese Acad Sci, Inst Mt Hazards & Environm, Key Lab Mt Environm Evolvement & Regulat, Chengdu 610041, Peoples R China 2.Chinese Acad Sci, Inst Atmospher Phys, State Key Lab Atmospher Boundary Layer Phys & Atm, Beijing 100029, Peoples R China 3.Univ New Hampshire, Inst Study Earth Oceans & Space, Complex Syst Res Ctr, Durham, NH 03824 USA
推荐引用方式 GB/T 7714	Deng, J.,Zhou, Z.,Zhu, B.,et al. Modeling nitrogen loading in a small watershed in southwest China using a DNDC model with hydrological enhancements[J]. BIOGEOSCIENCES,2011,8(10):2999-3009.
APA	Deng, J..,Zhou, Z..,Zhu, B..,Zheng, X..,Li, C..,...&Jian, Z..(2011).Modeling nitrogen loading in a small watershed in southwest China using a DNDC model with hydrological enhancements.BIOGEOSCIENCES,8(10),2999-3009.
MLA	Deng, J.,et al."Modeling nitrogen loading in a small watershed in southwest China using a DNDC model with hydrological enhancements".BIOGEOSCIENCES 8.10(2011):2999-3009.