Effect of Buffer Forest Strip on Soil and Water Conservation for Planting Betel Palm in Forested Land|水土保持数据集|林业管理数据集

This project was to build soil and water loss plots of betel palms under slopes 25% and 45% at Lienhuachih Research Center of Taiwan Forestry Research Institue. The soil and water loss plots had been treated with different locations of buffer forest strips for measuring surface runoff and soil erosoin. From field data of surface runoff and soil erosion, the best location of buffer forest strips would be identified for helping management of illegal planting fruits on hillslope of national forested lands.The average heights and breast diameters of betel palms were 6.3-8.4 m and 9.9-10.9 cm for 5 plots of gentle slope 25%, as well as 6.9-8.9 m and 10.3-11.9 cm for 5 plots of steep slope 45%, respectively. Comparing with growing condition of betel palms, the steep slope was better than gentle slope. The cover densities of herbaceous vegetation were 42%-70% for 5 plots at gentle slope 25% and 41%-67% for 5 plots at steep slope 45%, respectively. The cover densities of herbaceous vegetation for 5 plots at gentle slope 25% were higher than those of herbaceous vegetation for 5 plots at steep slope 45%. The average heights of Michelia formosana buffer forest strips were 2.50-2.93 m for 4 plots of gentle slope 25%, as well as 1.93-2.55 m for 4 plots of steep slope 45%, respectively. The average heights of Michelia formosana buffer forest strips for 4 plots of gentle slope 25% were higher than those of Michelia formosana buffer forest strips for 4 plots of steep slope 45%. The macro-porosities and total porosities of soil were 6.1%-7.4% and 39.0%-45.3% for 5 plots of gentle slope 25%, as well as 6.4%-7.5% and 41.2%-46.5% for 5 plots of steep slope 45%, respectively. Comparing with macro-porosities and total porosities of soil, the steep slope was a little more than gentle slope. The surface runoff depths and rates under 2659.5 mm of annual rainfall amount were 74.4-303.5 mm and 2.8%-11.4% for 5 plots at gentle slope 25%, as well as 98.3-398.2 mm and 3.7%-15.0% for 5 plots at steep slope 45%. respectively. The surface runoff depths and rates were small for Michelia formosana planted among whole slope or Michelia formosana buffer forest strips of 3 rows planted along lower slope. The soil erosion amounts and depths under 2659.5 mm of annual rainfall amount were 13.1-70.7 kg and 0.05-0.26 mm for 5 plots at gentle slope 25%, as well as 32.2-105.3 kg and 0.12-0.39 mm for 5 plots at steep slope 45%, respectively. The soil erosion amounts and depths were small for Michelia formosana planted among whole slope or MIchelia formosana buffer forest strip of 3 rows planted along lower slope. The surface runoff depths and rates as well as soil erosion depths were negative relation with the cover densities of herbaceous vegetation for gentle and steep slope. Decreasing surface runoff depths and rates as well as erosion depths would result from both effects of buffer forest strips and cover densities of herbaceous vegetation.