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| Characteristics of nitrogen runoff loss under different land uses in a rain collection area of the Hexi Reservoir in Changxing County |
| Received:December 29, 2016 |
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| KeyWord:Hexi Reservoir;different land use;overland runoff;nitrogen losses |
| Author Name | Affiliation | E-mail | | LÜ Ting | College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China
Zhejiang Provincial Key Laboratory of Subtropical Soil and Plant Nutrition, Hangzhou 310058, China | | | LIAO Min | College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China
Zhejiang Provincial Key Laboratory of Subtropical Soil and Plant Nutrition, Hangzhou 310058, China | liaomin@zju.edu.cn | | YE Zhao-jin | College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China
Zhejiang Provincial Key Laboratory of Subtropical Soil and Plant Nutrition, Hangzhou 310058, China | | | FANG Zhi-ping | College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China
Zhejiang Provincial Key Laboratory of Subtropical Soil and Plant Nutrition, Hangzhou 310058, China | | | HUANG Xiao-hui | College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China
Zhejiang Provincial Key Laboratory of Subtropical Soil and Plant Nutrition, Hangzhou 310058, China | | | ZHANG Yun | Changxing Station of Environmental Monitoring, Changxing 313100, China | | | SHI Hai-long | Changxing Station of Environmental Monitoring, Changxing 313100, China | | | SHEN Jie | Changxing Station of Environmental Monitoring, Changxing 313100, China | |
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| Abstract: |
| The aim of the present study was to identify measures to better protect the water quality of the Hexi Resevoir,China,via an improved understanding of the movement of nitrogen from land to water caused by nitrogen runoff due to soil erosion.Nitrogen losses caused by rain and the resulting soil erosion were assessed in field experiments on dry land,cultivated land,woodland,fallow land,and nursery land.Under natural rainfall conditions,the amounts and concentrations of nitrogen losses differed between the five types of land use.The annual losses of total nitrogen in runoff followed the following order:cultivated land (156.92 kg·hm-2)> dry land (114.24 kg·hm-2)> nursery land (35.61 kg·hm-2)> fallow land (3.99 kg·hm-2)> woodland (1.59 kg·hm-2).The nitrogen runoff losses from fallow land and woodland were less than those from cultivated land and dry land,which are both influenced by cultivation.Therefore,to improve the water quality of the Hexi Resevoir,it will be necessary to manage the surrounding land more appropriately.This will effectively reduce the nitrogen runoff losses and their potential impact on the water quality of the Hexi Reservoir.Our results also showed that nitrogen runoff loss is primarily in the form of particulate nitrogen,followed by nitrate nitrogen and ammonium nitrogen under different land uses.The annual runoff losses of particulate nitrogen from upland,cultivated land,woodland,fallow land,and nursery land accounted for about 61.67%,61.42%,75.56%,65.09%,and 69.11%,respectively,of the total annual nitrogen losses.In contrast,the annual runoff losses of nitrate nitrogen accounted for about 26.21%,28.56%,16.35%,21.30%,and 23.20%,respectively,of the total nitrogen losses.The annual runoff loss of ammonium nitrogen accounted for about 8.90%,7.87%,6.92%,11.78%,and 4.83%,respectively,of the total nitrogen losses.Thus,the key to reducing both nitrogen losses and their negative effects on the water quality of the Hexi Reservoir is to decrease surface soil erosion and eliminate the losses of particulate nitrogen.The appropriate modulation of land-use types is recommended to control the source of non-point-source pollution of the Hexi Reservoir. |
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