摘要
利用2001―2009年全国MODIS土地覆盖类型数据集,研究了人类活动对草地、农田和潜在自然植被空间分布的影响。研究结果表明,我国农田和草地面积在2001―2009年期间总体呈减少趋势,其中农田面积由2001年的1.445×108 hm2减少到2009年的1.425×108 hm2,在2005年面积达到最大,为1.543×108 hm2,2008年面积最小,为1.363×108 hm2;草地面积在9年内由2003年的4.201×108 hm2减少为2009年的4.032×108 hm2;农田面积的减少幅度(13.49%)大于草地(3.29%)。草地转为农田的面积每年以4.96%的速率在减少,农田转为草地的面积基本保持不变;草地转为其它土地覆盖类型的面积以每年20.87%的速率增加,而农田面积则基本保持不变,为3.579 5×107 hm2;其它土地类型转为草地(15.43%)和农田(2.45%)的趋势总体上逐年减少。9年间潜在自然植被的人类占用强度总体呈增加趋势,其中人类对草地的影响强度平均为38.18%,对森林的影响强度平均为37.36%。
Based on the MODIS land cover data sets, we studied the impacts of human activities on distribution of grassland, cropland and the potential natural vegetation （PNV） in China. The results showed that the cropland area dropped from 1.445×10^8 ha in 2001 to 1.425×10^8 ha in 2009. The maximum area--1.543×10^8 ha was in 2005 and the minimum area --1.363×10^8 ha was in 2008. The grassland area decreased from 4.201×10^8 ha in 2003 to 4.032×10^8 ha in 2009 during the research period. In total, the decreasing rate of cropland area （13.49%） was greater than that of grassland （3.29%）. The rate which grassland converted to arable land decreased by 4.96% per year, however, the rate converted to other land cover types increased by 20.87% per year. The rates of which cropland converted to grassland and other land cover types were similar. The rates of other land cover types converted into grassland （15.43%） and cropland（2.45%） decreased gradually year by year. The intensity of human occupancy of PNV increased during this research period which was relatively more intensive for grassland （38.18%） and forest （37.36%） among PNV categories.
出处
《草业科学》
CAS
CSCD
北大核心
2014年第1期66-74,共9页
Pratacultural Science
基金
国家自然科学基金项目(30972135)
中国工程院重大咨询研究项目(2012-ZD-7)
农业部公益性行业(农业)科研专项项目(201203006)
兰州大学中央高校基本科研业务费专项资金资助(lzujbky-2013-201)
关键词
草地
农田
潜在自然植被
人类占用强度
grassland
cropland
potential natural vegetation
human occupancy
