三峡库区植物篱技术对坡耕地土壤肥力的影响

Soil Fertility of Slope Croplands by Applying Technique of Plant Hedgerows in Three Gorges Reservoir Area

通过三峡库区25°紫色土坡耕地的定位试验观测,探讨了植物篱技术对坡耕地土壤肥力的影响。结果表明,植物篱技术科学合理地解决了坡耕地用地和养地的问题,一方面通过植物篱根系吸收土壤深层养分并以刈割茎叶返还土壤,促进了养分的循环与再分配,发挥了养分泵的功能;另一方面通过植物篱的阻滞和坡面覆盖,减少了由径流与侵蚀泥沙携带的养分损失,有效地改善了土壤肥力性状。

Technique of plant hedgerows is a favorable role in the sustainable development of eco-enviroment, measure for utilization of slopelands and plays an important resources and economy. Experiments on the purple soil fertility of a plant hedgerows system were conducted on a slope cropland of 25 degree in the Three Gorges Reservoir area. Results show that the plant hedgerow system is effective for soil fertility improvement. The root system of hedgerows is functioned as a ＂nutrient pump＂ to uptake soil nutrients from deep soil and return them to topsoil by pruning of hedgerows, which promotes soil nutrient circulation and redistribution. Runoff detention by hedgerows and mulching can effectively reduce soil nutrient loss by controlling soil loss and runoff,