关键词：
防护林;三北地区;Landsat TM;SPOT5;CBERS-02B
摘 要：
农田防护林是三北防护林体系工程重要组成部分,准确估算农田防护林(林带)的数量与空间分布对了解该林种防护效应的发挥程度及促进农田防护林体系建设进程具有重要作用.本研究利用多尺度遥感影像获取林带长度,结合实地调查的林带宽度,估算三北地区(东北西部、华北北部和西北大部;依据地貌特征,将三北地区划分为东北、华北、黄土高原和蒙新4区)农田防护林面积.东北和华北区的林带长度通过建立LandsatTM和SPOT5解译得到的林带长度的关系获得;黄土高原和蒙新区则通过建立有林带农田面积(基于LandsatTM获得)和林带长度(基于CBERS-02B获得)关系获得.结果表明:至2008年,三北地区农田防护林(包括中龄林、成熟林、过熟林;不包括新造林、未成林和部分残次林;下同)总长度为106.40*107m,其中,东北区23.82*107m,华北区6.07*107m,黄土高原区25.58*107m,蒙新区50.93*107m;三北防护林体系工程农田防护林面积约为130.31*104hm2(114.98*104~145.64*104hm2),其中,东北区42.88*104hm2(37.52*104~48.24*104hm2),华北区10.79*104hm2(9.56*104~12.29*104hm2),黄土高原区25.58*104hm2(22.70*104~28.45*104hm2),蒙新区50.93*104hm2(45.20*104~56.66*104hm2);估算的平均精度为89.54%,其中,东北和华北区79.27%,蒙新和黄土高原区99.80%.
单 位：
1State Key Laboratory of Forest and Soil Ecology, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110164, China%2Key Laboratory for Management of Non-commercial Forests, Liaoning Province, Shenyang 110016, China%3University of Chinese Academy of Sciences, Beijing 100049, China
关键词：
farmland shelterbelt%the Three-North regions%Landsat TM%SPOT5%CBERS-02.
摘 要：
Farmland shelterbelt is an important component in the Three-North Shelter/Protective Forest Program. To accurately estimate the quantity and spatial distribution of the farmland shelterbelts in the Three-North regions (west of Northeast China, north of North China, and most part of Northwest China) is of significance to understand the protective effect of these shelterbelts and to promote their construction processes. Based on the multi-scale remote sensing data to acquire shelterbelt length and the field survey data to obtain shelterbelt width, this paper estimated the farmland shelterbelt area in the Three-North regions that were topographically divided into four areas, i.e., Northeast China, North China, Loess Plateau, and Northwest China. The shelterbelt length in Northeast China and North China was acquired from the relationships between the shelterbelt lengths from SPOT5 and Landsat TM, while that in Loess Plateau and Northwest China was obtained from the relationships between the shelterbelt lengths from CBERS-02B and the farmland areas from Landsat TM. The results indicated that in 2008, the total length of the farmland shelterbelts (including middle-aged, mature, and over-mature shelterbelts, and excluding new planted, un-matured, and part of declined shelterbelts) in the Three-North regions was 106.40*107 m, including 23.82*107 m in Northeast China, 6.07*107 m in North China, 25.58*107 m in Loess Plateau, and 50.93*107 m in Northwest China, and the total area of the farmland shelterbelts was about 130.31*104 hm2 (114.98*104-145.64*104 hm2), including 42.38*104 hm2 (37.52*104-48.24*104 hm2) in Northeast China, 10.92*104 hm2 (9.56*104-12.29*104 hm2) in North China, 25.58*104 hm2 (22.70*104-28.45*104 hm2) in Loess Plateau, and 50.93*104 hm2 (45.20*104-56.66*104 hm2) in Northwest China. The mean accuracy of the estimation was 89.54% (79.27% in Northeast and North China, and 99.80% in Loess Plateau and Northwest China).
