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| Effects of different exploitation manners on soil and water losses in hilly orchard |
| Huang Yibin1,2,Luo Xuhui1,2,3,Zheng Zhongden1,2,Zhang Wusheng4,Huang Xiusheng1,2,Zhan Jie1,2 |
| 1.Agricultural Ecology Institute,Fujian Academy of Agricultural Sciences,350013,Fuzhou;2.Fujian Engineering and Technology Research Center for Hilly Prataculture,350013,Fuzhou;3.College of Life Science,Fujian Agricuture and Forestry Univeisity,350002,Fuzhou;4.Youxi Meteorological Bureau,365000,Sanming,Fujian: China |
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Abstract Youxi County is located in the middle part of Fujian Province and belongs to the mid-subtropical monsoon zone.From 1996 to 006,long-term observation was carried out to study the effects of 5 exploitation manners on soil and water losses.Results showed that the average annual rainfall in last decade was 1 575.5 mm,and the evaporation was 1 461.1 mm.The annual rainfall is mostly amassed in the first half of the year and the rainstorm of which occupies 11% of raining times and 50% of rainfall amount in the whole year.Strong rainfall frequently occurred in May,June,and August.During these periods,measure was needed to control soil and water losses.The land exploitation by building terraces had the higher function to avoid occurrence of runoff than that by down-slope.The coefficient of run off in terrace plots was 0.068 8,with obviously lower than down-slope plots(0.286 5).Green covering measure had high function to increase soil water content and to control soil erosion than clean tillage.The 0-30 cm soil water content in green covering plots increased 0.8%-0.9% than in clean tillage plots.Green covering plots was not found soil erosion,but in clean tillage plots,soil erosion was serious.For terrace exploitation,erosion was found on wall,annual erosion mount was 10.3 kg/m,and erosion modulus for down-slope exploitation was 2 388.2 t/(km2·a).
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Received: 06 May 2008
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