A comparison of the effect of three grass species on controlling non-point pollution in orchards

doi:10.11686/cyxb20150206

Abstract

Abstract: Pastures of alfalfa (Medicago sativa), chicory (Cichorium intybus) and white clover (Trifolium repens) were established separately to study their effects on controlling runoff and non-point pollution under the application of fertilizers in a peach orchard. Simulations of torrential rain were conducted. The results showed that the amount of runoff in the chicory, alfalfa, and white clover pastures decreased 41.6%, 35.0% and 58.4% respectively, in comparison with the control, but there is no difference between these three pastures. The relationship between runoff amount and pasture coverage was significantly negative, but relationships between runoff amount and density, as well as runoff amount and basal coverage of pasture, were not significant. Compared to the control, the content of ammonium nitrogen, total nitrogen and total phosphorus in runoff significantly decreased in the three pastures with the application of fertilizers. This decrease was most pronounced with white clover, with chicory in second place. This study suggests that establishing pastures in orchards can help to control runoff and non-point pollution and that the effectiveness of this control depends on the types of pasture (e.g. plant species or coverage).

GAO Xiaoye, ZHANG Xingxing, ZHU Jianguo, AN Yuan. A comparison of the effect of three grass species on controlling non-point pollution in orchards[J]. Acta Prataculturae Sinica, 2015, 24(2): 49-54.

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