摘要
基于2000～2010年土地利用／覆被变化、植被覆盖度、坡耕地分布等数据，分析陕甘宁退耕还林／草工程区耕地转换为林地或草地状况、不同坡耕地退耕情况及退耕区植被覆盖度变化等，从而揭示该区域退耕还林／草工程的生态成效。结果表明：①2000～2010年，陕甘宁退耕还林／草工程区耕地面积减少了9501．12km2,减少比例占工程区总面积的1．41％，其中2168．80km2和6753．48km2分别转变为林地和草地，分别占减少耕地面积的22．83％和71．08％，以退耕还草为主说明工程实施过程中考虑了干旱／半干旱区水热条件限制。②2000～2010年，研究区地表植被覆盖度增加了8．37个百分点，呈现较明显的增长趋势，其中耕地转林地区域增加了14．63个百分点，耕地转草地区域增加了18．06个百分点，达到甚至超过了工程区林草覆盖率增加的规划目标。③2000～2010年，陕甘宁退耕还林／草工程区内大于15。坡耕地面积减少了1800．02km2，其中15°～25°坡耕地转换为林地和草地面积为408．68km3和1048．04km3，大于25°坡耕地转为林地和草地面积分别为149．83km2和152．36km2。
Based on data of land use/coverage change, vegetation coverage, slope land distribution during 2000 -2010, the conversion of cropland to forest or grassland condition, the vegetation coverage change were analyzed, so as to reveal ecological effectiveness of Grain-for-Green project in Shanxi-Gansu-Ningxia region. The results are shown as follows. ① From 2000 to 2010, farmland in the Shanxi-Gansu-Ningxia Region decreased by 9 501.12 km2, with the reducing proportion of 1.41% accounted for the total area of the study area. Converted from farmland to forest and grassland were 2 168.80 km2 and 6 753.48 km2, which accounted for 22.83% and 71.08% of reduced farmland, respectively. ②From 2000 to 2010, the vegetation coverage was improved progressively, the average coverage of the whole study area increased by 8.37 percentage points. Among them, the coverage of regions with farmland to forest increased by 14.63 percentage points, and the coverage of regions with farmland to grassland increased by 18.06 percentage points.③In resent ten years, the area of farmland with slope greater than 15 ° decreased by 1 800.02 km2. In which, farmland with slops between 15 °- 25° slope, 408.68 km2 and 1 048.04 km2 were converted to forest and grassland respectively. The farmland with slops more than 25°, with 149.83 km2 and 152.36 km2 transferred to forest and grassland respectively.
出处
《安徽农业科学》
CAS
2014年第17期5524-5528,共5页
Journal of Anhui Agricultural Sciences
基金
国家自然科学基金面上项目(41371019)
全国生态环境十年变化遥感调查与评估项目专题(STSN-14-00)
关键词
陕甘宁地区
退耕还林/草
土地利用变化
植被覆盖度
生态成效
Shanxi-Gansu-Ningxia Region
Grain for Green Program
Land use change
Vegetation coverage
Ecological effectiveness
