干旱地区农业研究
榦旱地區農業研究
간한지구농업연구
AGRICULTURAL RESEARCH IN THE ARID AREAS
2013年
4期
207-213,223
,共8页
陕西省%退耕还林%植被覆盖度%土地利用%坡耕地
陝西省%退耕還林%植被覆蓋度%土地利用%坡耕地
합서성%퇴경환림%식피복개도%토지이용%파경지
Shaanxi Province%returning cropland to woodland%vegetation coverage%land use%sloping farmland
利用MODIS NDVI数据和像元二分模型计算的植被覆盖度，比较分析退耕还林工程区与周边区域、主要土地利用类型、不同坡度耕地植被覆盖度变化程度和趋势。结果表明：（1）陕西省退耕还林区植被覆盖度从2000年到2011年呈现显著的增长趋势，增长速率高于周边区域；（2）退耕还林区植被覆盖变化百分率≥10％的面积占79．8％，≤-10％所占面积不及1％；（3）退耕还林区植被覆盖度显著增加的面积占其总面积的70．6％，显著减少的面积仅占0．1％，植被覆盖度显著增加的情况主要出现在未利用地、草地、林地和耕地，显著和极显著降低的发生在城乡、工矿、居民用地和极少部分耕地；（4）坡耕地植被覆盖改善比例大，坡耕地植被覆盖改善对于耕地植被改善贡献较大。在陕西省气候呈现暖干化发展趋势背景下，退耕还林区植被覆盖度呈现显著增长趋势，增长速率高于周边区域，坡耕地、林地、草地均比其他类型有明显的增加，退耕还林政策实施区域取得了良好的植被恢复效果。
利用MODIS NDVI數據和像元二分模型計算的植被覆蓋度，比較分析退耕還林工程區與週邊區域、主要土地利用類型、不同坡度耕地植被覆蓋度變化程度和趨勢。結果錶明：（1）陝西省退耕還林區植被覆蓋度從2000年到2011年呈現顯著的增長趨勢，增長速率高于週邊區域；（2）退耕還林區植被覆蓋變化百分率≥10％的麵積佔79．8％，≤-10％所佔麵積不及1％；（3）退耕還林區植被覆蓋度顯著增加的麵積佔其總麵積的70．6％，顯著減少的麵積僅佔0．1％，植被覆蓋度顯著增加的情況主要齣現在未利用地、草地、林地和耕地，顯著和極顯著降低的髮生在城鄉、工礦、居民用地和極少部分耕地；（4）坡耕地植被覆蓋改善比例大，坡耕地植被覆蓋改善對于耕地植被改善貢獻較大。在陝西省氣候呈現暖榦化髮展趨勢揹景下，退耕還林區植被覆蓋度呈現顯著增長趨勢，增長速率高于週邊區域，坡耕地、林地、草地均比其他類型有明顯的增加，退耕還林政策實施區域取得瞭良好的植被恢複效果。
이용MODIS NDVI수거화상원이분모형계산적식피복개도，비교분석퇴경환림공정구여주변구역、주요토지이용류형、불동파도경지식피복개도변화정도화추세。결과표명：（1）합서성퇴경환림구식피복개도종2000년도2011년정현현저적증장추세，증장속솔고우주변구역；（2）퇴경환림구식피복개변화백분솔≥10％적면적점79．8％，≤-10％소점면적불급1％；（3）퇴경환림구식피복개도현저증가적면적점기총면적적70．6％，현저감소적면적부점0．1％，식피복개도현저증가적정황주요출현재미이용지、초지、임지화경지，현저화겁현저강저적발생재성향、공광、거민용지화겁소부분경지；（4）파경지식피복개개선비례대，파경지식피복개개선대우경지식피개선공헌교대。재합서성기후정현난간화발전추세배경하，퇴경환림구식피복개도정현현저증장추세，증장속솔고우주변구역，파경지、임지、초지균비기타류형유명현적증가，퇴경환림정책실시구역취득료량호적식피회복효과。
MODIS NDVI data and dimidiate pixel model were used to analysis the variation degree and trend of FVC of main land use types and cultivated land with different slopes in both the project zones and the perimeter zones .The re-sults showed :(1) The FVC in the project zones of returning cropland to woodland increased significant with a higher rate than that in the perimeter zones .(2) The area with an increase rate of FVC being higher than 10% occupied for 79 .8%of the project zones ,while the area with a decrease gradient being higher than 10% occupied for less than 1% .(3) The area with a significant increased FVC occupied for 70 .6% of the project zones ,while the area with a significant de-creased FVC only occupied for 0 .1% .The FVC of unused land ,grassland ,forestland and most of cultivated land showed a significant increase trend ,while that of construction land for industries ,mines and residents in urban and rural regions ,and a small part of cultivated land showed a significant or extremely significant decrease trend .(4) The FVC of sloping farmland was improved significantly ,and it contributed with a high proportion to the vegetation improvement of whole farmland .Under the circumstance of warming and drying tendency ,the FVC in the project zones of returning crop-land to woodland showed a significant increase trend ,with a higher rate that in the perimeter zones .The FVC of sloping farmland ,forestland and grassland increased more than that of other land use types .This could come to a conclusion that the policy of returning cropland to woodland produced a good effect of vegetation restoration .
