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| Influence of tillage and compaction on solute transport process on the sloping land |
| Wang Hui1,2,Wang Quanjiu2,3,Shao Ming'an2,Li Yuyuan4 |
| 1.College of Engineering,Hunan Agricultural University,410128,Changsha;2.State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau,Institute of Soil and Water Conservation,CAS&MWR, 712100,Yangling,Shaanxi;3.Institute of Water Resource,Xi'an University of Technology,710048,Xi'an;4.Institute of Subtropical Agriculture,CAS,410125,Changsha: China |
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Abstract Soil and water losses and leaching loss of nutrients from sloping land are major reasons for soil degradation and water pollution.Experiments were conducted on runoff and sediment yield characteristics and nutrients solution movement in field plots by soil surface treatments(tillage and compaction) under simulated rainfall conditions.Comparing soil tillage with the compaction,the initial runoff generation time was delayed by 3 times,the transforming ratio from rainfall to soil moisture was more than 10%,but soil loss amount increased by 67%.Under tillage conditions,the amount of losses of dissolved phosphorus(DP) and sediment extractive phosphorus(SEP) decreased significantly,but the loss form was not changed and particle phosphorus loss was dominant.Tillage treatment had greatly changed the ratio of dissolved bromine(Br) and sediment extractive bromine(SBr),its value(Br/SBr) reduced by 72%.Soil tillage enhanced the possibility of bromine(or NO-3-N) leaching.It is practical meaning for decreasing soil,water and nutrients losses from sloping land through taking no-tillage or conservation tillage measures on sloping land,and combining with other cultivated measures.
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Received: 09 December 2007
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