黄土丘陵沟壑区林草间作种植效益评估

为了评估黄土丘陵沟壑区近10年来退耕还林还草工程实施过程中林草间作模式产生的实际效益,对定西市部分地区随机抽样调查,选取5种典型的林草复合植被系统进行定量分析,结果表明：林草间作种植模式兼顾了生态、经济和社会3大效益,达到了农民增收致富,同时改变土地利用结构、恢复植被、减少水土流失、改善生态环境的目的。林草间作模式的经济效益主要体现在草畜转化上,生态效益主要为水土保持与改良土壤结构,社会效益主要表现为林草牧业统一协调发展。林草间作模式培育初期经济效益较低,后期生态效益和社会效益较高。

Benefit evaluation of inter-cropping between trees and grasses in the loess gully-hilly region

In order to evaluate the inter-cropping between trees and grasses conducted in "returning cropland to forest and grassland project" in recent years,the benefit of 5 typical inter-cropping patterns was studied.The results showed that the pattern of inter-cropping between trees and grasses was better for improving ecological environment and promoting income.This pattern combined the ecologic,economic and social benefit together and could change the land use structure,restore vegetation and reduce the soil erosion.