福建省林地覆盖变化及其海拔梯度效应的分析

Changes in Woodland Cover and its Altitude Gradient Analysis in Fujian Province

采用资源环境科学与数据中心提供的2000,2010和2020年的空间分辨率为30m×30m的土地利用遥感数据,分析福建省林地覆盖时空变化规律,并结合DEM数据,研究林地覆盖变化在不同海拔梯度的响应机制。结果显示:1)研究区2000,2010,2020年林地总面积分别是76279.98,75807.97,75595.75km^(2),总面积逐渐减少;2)2000—2020年,林地的重心未发生较大偏移;林地分布范围整体呈现扩张的态势;空间变化上,无论是2000—2010年还是2010—2020年,稳定区都占据一定的优势,面积在1200000km^(2)左右;2000—2010年,林地丧失面积为1134.78km^(2),林地获取面积为662.78km^(2);2010—2020年,林地丧失面积为316.50km^(2),林地获取面积为102.61km^(2);3)2000—2010年,林地主要与建设用地、草地发生转换,林地转出648.56km^(2)到建设用地,林地从草地转入577.51km^(2);2010—2020年,林地主要与建设用地转换,林地转出240.47km^(2)到建设用地;4)在海拔<500m的地方,林地丧失和获取面积均达到最大;随着海拔增加,林地丧失/获取面积逐渐减少,当海拔>2000m时,林地丧失与获取几乎不发生。

Taking Fujian Province as the research area,using the remote sensing data of land use with spatial resolution of 30m×30m provided by the Resource and Environmental Science and Data Center in 2000,2010 and 2020,the temporal and spatial variation laws of forest land cover in Fujian Province were analyzed.And the effect of different altitude gradients on forest cover changes was studied with DEM data.The results showed that:1)The total forest area of the study area in 2000,2010,and 2020 was 76,279.98km^(2),75,807.97km^(2),and 75,595.75km^(2),respectively;the total forest area was decreasing;2)From 2000 to 2020,the center of gravity of forest land did not shift greatly;the distribution range of forest land showed a trend of expansion as a whole;in terms of spatial changes,whether it was 2000-2010 or 2010-2020,the stable area had certain advantages,with the area of about 1,200,000km^(2);from 2000 to 2010,the forest land loss area was 1134.78km^(2),and the forest land acquisition area was 662.78km^(2);from 2010 to 2020,the forest land loss area was 316.50km^(2),and the forest land acquisition area was 102.61km^(2);3)From 2000 to 2010,Forest land wasmainly converted with construction land and grassland,and 648.56 km^(2) of woodland was converted to construction land,and 577.51 km^(2) of woodland was convertedfrom grassland;from 2010 to 2020,forest land was mainly converted to construction land,and 240.47 km^(2) of woodland was transferred to construction land;4)At altitudes<500m,both the loss and gain of forest land reached the maximum;with the increase of altitude,the loss/gain area of forest land gradually decreased,and when the altitude>2000m,the loss and gain of forest land hardly occured.