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三峡库区 2 5°紫色土坡地植物篱 -农作系统的实验观测表明 ,通过植物篱裁剪枝叶返田 ,能够增加土壤有机质和改善土壤物理性状。由于侵蚀过程的影响 ,植物篱带之上、篱带中养分含量高于篱带下。SCUAF模型的 5年预测结果表明 ,该模型于土壤有效 P的预测有较好的精度 ,对有机 C和全 N的预测结果也可接受。通过实测值输入 SCUAF模型的 10年预测结果则显示 ,农林复合经营将有利于坡地生态系统的养分平衡向有利方向转化 ,显著减少土壤侵蚀 ,其中新银合欢系统表现较好
Experimental observations on hedgerows and cropping systems on 25 ° purple soil slopes in the Three Gorges Reservoir Area show that soil organic matter can be increased and soil physical properties improved by clipping the branches and leaves of the hedgerows. Due to the erosion process, the nutrient content in the fences was higher than that under the fences. The 5-year prediction of SCUAF model shows that the model has good accuracy in predicting soil available P, and the predictions of organic C and total N are also acceptable. The 10-year forecast results of SCUAF model input from the measured values show that the agroforestry system will be conducive to the nutrient balance of slope ecosystems in a favorable direction, significantly reducing soil erosion, of which the performance of the new Acacia system better