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首页> 外文期刊>Journal of food, agriculture & environment >Influence of land use on nitrate concentrations in baseflow in a rural watershed of Three Gorges Reservoir Area, China
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Influence of land use on nitrate concentrations in baseflow in a rural watershed of Three Gorges Reservoir Area, China

机译：三峡库区农村流域土地利用对底流硝酸盐浓度的影响

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摘要

In this paper, the relationships between nitrate (NO3--N) concentrations in baseflow and land use were studied in a rural watershed of Three Gorges Reservoir Area from 2004 to 2006. The results indicated that NO3--N concentrations ranged from 0.4 to 14.6 mg L-1 and were significantly higher in autumn and winter. Analysis of variance indicated that there was significant difference in NO3--N concentrations among seasons and sampling points. In addition, an interannual increasing trend was found in the study period. Moreover, regression analysis revealed that NO3--N concentrations significantly correlated with the proportions of paddy field and orchard in the subwatersheds, while woodland had positive effect for preventing NO3--N loss. Paddy field has more contribution to NO3--N concentrations compared to other land use types. The results indicted that the baseflow is one of major pathways of NO3--N losses, and agricultural land use strongly influences NO3--N concentration in stream water in rural watersheds of Three Gorges Area. Therefore, it is indispensable to adjust land use structure and agricultural activities for water source protection in Three Gorges Reservoir Area, China.
机译：本文研究了三峡库区2004-2006年农村集水区硝酸盐（NO3--N）浓度与土地利用的关系。结果表明，NO3--N浓度在0.4-14.6之间。毫克L-1，并且在秋季和冬季显着较高。方差分析表明，不同季节和采样点之间NO3--N浓度存在显着差异。此外，在研究期间发现了年际增长趋势。此外，回归分析表明，NO3--N的浓度与该小流域的水田和果园的比例显着相关，而林地对防止NO3--N的损失具有积极作用。与其他土地利用类型相比，稻田对NO3--N浓度的贡献更大。结果表明，基流是NO3--N损失的主要途径之一，农业土地利用对三峡区农村集水区溪流中NO3--N的浓度影响很大。因此，在中国三峡库区，必须调整土地利用结构和农业活动来保护水源。

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