植物篱与石坎梯田改良坡耕地效益研究

三峡库区秭归段生态环境脆弱,当地群众广泛采用石坎梯田为主的工程措施和植物篱为主的农林复合技术措施改良利用坡耕地。通过试验,对三峡库区秭归县相同坡度、坡向和土层厚度的坡耕地采取石坎坡改梯和定植等高植物篱的投入和产出进行对比,结果表明:石坎梯田与植物篱均是改良利用坡耕地的有效方法;石坎梯田建设期投入费用高,涵水保土能力强,田坎无经济效益;植物篱建设期投入费用低,生产期运行费用略高于石坎梯田,成坎周期较长,涵水保土能力初期较低后期逐渐增强,生产期产出效益明显。

Benefit Study on the Improved Slope Farmland by Alley Cropping and Stone Dike Terrace

Eco environment is fragile at the Zigui section of reservoir area of Three Gorges, local people widely a dopted the engineering measures of stone dike terrace and the agriculture ＆ forestry composite technology of alley crop ping to improve the slope farmland. Through the experiments, the comparisons were made to the input and output of slope farmland reformed to terrace land and permentant planting of contour alley cropping with the same slope degree, aspect and soil thickness. The results show that, both stone dike terrace and alley cropping are effective methods to im prove the slope farmland. Stone dike terrace need high input cost during the construction period with the high capacity of water and soil conservation while no economic benefit of the raised paths through the field. While the alley cropping need the low input cost during the construction period and the operation cost is higher than that of stone dike terrace with long cratering period. The capacity of water and soil conservation will be low at the initial stage and gradually in crease with obvious output benefit at the production period.