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10th International Rainwater Catchment Systems Conference
"Rainwater International 2001"
Mannheim, Germany - September 2001

Section 4: Rainwater Catchment in Agriculture

Paper 4.26

Catchment Effect of Contour Hedgerow Plants on Slopeland

Qiangguo Cai and K.F. Andrew Lo
Institute of Geography, Chinese Academy of Sciences
Beijing
China, 100101
E-mail: caiqg@mx.cei.gov.cn

Introduction

Sloping Agroforestry (contour hedgerows plants) is an available land use with low input and high ecological output. It is widely applied in China and some developing countries. The purpose of this paper is to study catchment effect, runoff loss control of contour hedgerow plants on purple soil slopeland in the Three Gorges Reservoir areas of Yangtze River, South China and on loess slopeland in the Northwest hilly area of Hebei Province, North China.

The experimental plots are located in Hongshiyan Branch of the Nursery for Orange Improved Varieties under the Bureau of Farm and Local Products of Zigui County, the Three Gorges area of Hubei Province in China, with an elevation of 200 m and on a southwest facing slope. The parent rock is Jurassic Penglaizhen Formation with a soil thickness of 50-70 cm. Five experimental plots of 25 degrees steepness were used for water and soil loss observations of different hedgerow plants, including Hierochloe odorata, Coriariaceae, Vitex negundo, and Neoleucaena glauca. No.H-9 was a control plot, a slopeland mainly devoted to normal farming practices. In addition to year-round observations of natural rainfall, runoff and siltation in the experimental plots, simulated rainfall experiments were also carried out twice a year to observe rainfall-induced runoff and sediment yield to compensate for inadequacy in natural rainfall observations. Nearly 60 simulated rainfall experiments were completed with down-sprayed rainfall simulator introduced from Canada, and SPRACO cone-shaped sprayer made in U.S.A. The momentum obtained from the simulated experiments was roughly equivalent to 90 percent of isointense natural rainfall (Cai et al., 1992). This study conducts quantitative analyses on 16 selected simulated rainfall experiments to determine the impact of different land use types on soil and water loss.

PDF of full document (2pp, 35kb)


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