Influence and its benefits evaluation of removal lands from cultivation to afforestation and grassland in slope farmland on soil erosion in hilly region of purple soil
Liu Gangcai1,2, Li Lan1, Zhou Zhonghao1, Zhang Jianhui1
1.Institute of Mountain Hazard and Environment, Chinese Academy of Sciences & Ministry of Water Resources, 610041, Chengdu;2.College of Resources and Environment, Southwest Agriculture University, 400716, Chongqing:China
Abstract It' s important to understand the influence of removal lands from cultivation to afforestation and grassland on soil erosion for farmland use structure adjustment and benefits evaluation of soil and water conservation of those lands. The soil erosion of four types of farmland plot of planting crops (wheat-corn), grasses (ryegrass), fruit trees(loquat), and fruit trees + grasses, were investigated for two years (2003-2004) at Yanting purple soil agriculture experimental station of Chinese Academy of Sciences, and its comprehensive evaluation of soil and water conservation was also made by hierarchy analysis process. The observation results showed that the removal slope farmland used as types of fruit trees and grasses significantly decreased soil erosion by over 30% comparing with crop type, and especially as type of "fruit trees + grasses" by over 60% . Besides, the amount of soil erosion of only planting fruit trees was more than that of planting crops. Therefore, one of key countermeasures of controlling soil erosion is to increase the land coverage. Benefits analysis results showed the rank of its comprehensive benefits is " fruit trees + grasses' type > grasses type > crops type > fruit trees type.
LIU Gang-Cai-；Li-Lan-；Zhou-Zhong-Gao-；Zhang-Jian-Hui. Influence and its benefits evaluation of removal lands from cultivation to afforestation and grassland in slope farmland on soil erosion in hilly region of purple soil[J]. SSWCC, 2005, 3(4): 32-36.
