文献类型： 会议论文

第一作者： J. Y. Wu

作者： J. Y. Wu ¹ ; D. Huang ¹ ; W. J. Teng ¹ ; V. I. Sardo ² ;

作者机构： 1.Beijing Academy of Agriculture and Forestry Sciences, Haidian District, Banjing Road, 100097 Beijing, P.R. China

2.Department of Agricultural Engineering, Faculty of Agriculture, University of Catania, via, santa Sofia 100, 95123 Catania, Italy

关键词： soil erosion;overland flow;filtering strips;simulated rain;water storage;empiric erosion model

会议名称： Conference on 21st Century Watershed Technology

主办单位：

页码： 449-456

摘要： A plot-scale research was conducted in Northern China in order to assess two grass hedges (Pennisetum alopecuroide L. and Arundinella hirta (Thunb.) Koidz.) ability in reducing overlandflow and encouraging water storage in the soil.The research, conducted during two crop cycles, tested the effects of slope, rain intensity and protective system on overlandflow and soil transport. A rain simulator was used and the protocol included a "dry", a "wet" and a "very wet" run for every combination of variables, each run during one hour. The 36 experimental plots (resulting from 4 slopes x 3 protections x 3 replications) had the size of m 11.0 x 1.6. Multiple regressions at the end of the second cycle were calculated for the very wet runs;the analysis was conducted on raw data (n=216) and data resulting from the average of the three replications (n=72). The multiple regression analysis showed that a simple empirical model can explain over 75 % of variations in overland flow with sufficient accuracy and precision. The model permitted to simulate and compare the protective action of the grass hedges, with pennisetum resulting more efficient than arundinella. A function linking runoff to solid transport was also worked out. It is felt thatsuch indications can be useful in the design ofprotective structures to reduce overlandflow and encourage water storage in those semi-arid areas suffering both for runoff and soil erosion during the rain season and drought during the dry season.

分类号： TV213.4-532