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通过对试验区水平梯田、杉木林和裸地三种不同处理地段水土流失状况的定位观测．以及地表径流水水质和土壤理化性状的分析．认为水平梯田和茂密的林木覆被他表，不仅大大减低土壤侵蚀量．而且能降低土壤物质的流失量。据研究，水平梯田和杉木林区的年土壤侵蚀模数分别为荒波对照区的2.4％和4.01％，年地表径流系数分别为对照区的42．3％和32．3％；梯田区氮、磷、钾和有机物质的流失量分别比对照区低67．26％，70．49％，66．4％和95．57％；杉木林区分别比对照区低72．07％，77．02％，43．18％和90．7％。此外，水平梯田和杉木林地对滞洪和减洪、增加土灌入沙方面也有重要作用，其产流时间比对照区迟30～50min，洪峰流量减低200％～300％。
Through the observation and observation of soil and water loss in three different treatment plots of horizontal terraces, Chinese fir plantations and bare land in the experimental area. As well as the analysis of surface runoff water quality and soil physical and chemical properties. He believes that horizontal terraces and dense forest cover him, not only greatly reduce the amount of soil erosion. But also reduce the amount of soil material loss. According to the research, the annual soil erosion modulus of terraced fields and Chinese fir forest were 2.4% and 4.01% respectively of the uncultivated area and the annual surface runoff coefficients were 42.3% and 32.3% of the control area respectively; The loss of phosphorus, potassium and organic matter were 67.26%, 70.49%, 66.4% and 95.57% lower than that of the control area respectively; the lower one was 72.07% and the lower one was 77.02 %, 43.18% and 90.7%. In addition, horizontal terraces and Chinese fir plantations also play an important role in detention and flood control, increasing soil filling into the sand. The runoff time is 30 to 50 minutes later than the control area and the flood peak discharge is reduced by 200% to 300%.