【摘要】 林草植被恢复建造是水土保持型生态农业建设中的重要一环,也是安塞试区极具特色的一个重要方面.进入“九五”以来,试区在整体推进水土保持型生态农业建设中,进一步加强植被建造,调整土地利用结构,生态经济良性循环态势已经呈现出来.1999年农林草地面积比例为 1:2.0:2.2。“九五”前4年平均耕地面积约为“七五”之初的1/2,然而粮食平均单产却是“七五”的 2.85倍,达到 2280kg/hm~2,总产依然得到增加.盖度0.6以上的植被的覆盖率达到57%,天然灌木林成片出现.年输沙模数较治理之初减少80%以上.更多还原

【Abstract】 The re-vegetation is an important part of conservational eco-agriculture construction as well as an aspect with distinctive features in Ansai experimental region, (i. e. Zhifanggou small watershed). The watershed has further stressed the re-vegetation and adjusted the land use ratio of farmland, woodland and grassland, in the process of advancing the whole conservational ecoagriculture construction in the period of 1996-2000, so that the fine state of ecological economy system cycle has emerged. The area ratio of farmland, woodland and grassland was 1.0:2.0:2.2 in 1999. Even though the average area of farmland from 1996 to 1999 was about a half of the area in 1986, the crop yield per unit area increased by 185% over 1986-1990 and reached to 2280 kg/hm2, so the total crop yield of the watershed increased too. The coverage of trees and grasses with more than 0. 6 cover-degree reached to 57%, and natural shrubbery emerged in many plots in 1999, The modulus of watershed sediment discharge reduced by 80% from the beginning of watershed control to the period of 1996-1999.更多还原