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| Characteristics of Nitrogen Runoff Losses from Economic Forest Lands in Hilly Red Soil Area of Zhejiang Province, China |
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| KeyWord:economic forest; nitrogen loss; terrain; management measures |
| Author Name | Affiliation | | LIU Qiao | Zhejiang Provincial Key Laboratory of Subtropical Soil and Plant Nutrition/Key Laboratory of Polluted Environment Remediation and Ecological Health，College of Environment and Resource Sciences, Zhejiang University, Hangzhou 310058, China
| | ZHANG Li-ping | Zhejiang Provincial Key Laboratory of Subtropical Soil and Plant Nutrition/Key Laboratory of Polluted Environment Remediation and Ecological Health，College of Environment and Resource Sciences, Zhejiang University, Hangzhou 310058, China
| | NIE Guo-hui | Zhejiang Soil and Water Conservation Monitoring Center, Hangzhou 310007, China | | HU Xiang-ming | Yongkang Soil and Water Conservation Supervision and Management Station，Yongkang 321300, China | | QIAN Jing | Zhejiang Provincial Key Laboratory of Subtropical Soil and Plant Nutrition/Key Laboratory of Polluted Environment Remediation and Ecological Health，College of Environment and Resource Sciences, Zhejiang University, Hangzhou 310058, China
| | LIAN Lin-lin | Zhejiang Provincial Key Laboratory of Subtropical Soil and Plant Nutrition/Key Laboratory of Polluted Environment Remediation and Ecological Health，College of Environment and Resource Sciences, Zhejiang University, Hangzhou 310058, China
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| Abstract: |
| Nitrogen loss in sloping forest lands is not only an important source of non-point source pollution, but also reduces use efficiency of nitrogen fertilizer. An experiment was conducted to monitor nitrogen losses in persimmon economic forests in hilly red soil area in Yongkang, Zhejiang. Total 7 runoff plots were set up under different terrains and forest managements. Grit chambers were established to collect water samples monthly. Different forms of nitrogen in water samples were then measured. Nitrogen losses were obviously synchronous with precipitation in a hydrological year. Most of nitrogen losses occurred in rainy and typhoon seasons, which accounted for 66.2% of the annual precipitation. During these two seasons, TN, NO-3-N and NH+4-N losses were 80.3%, 78.2% and 83.0% of the annual total N loss, respectively. In the hydrological year, the rates of TN and NO-3-N losses were crest>concave slope>convex slope, while the rate of NH+4-N losses was concave slope>crest>convex slope. The cumulative nitrogen losses under three terrains had power function relationship with time. Grass coverage reduced runoff losses of TN, NO-3-N and NH+4-N by 22.1%, 36.2% and 44.1%, respectively. |
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