Analysis of Spatial and Temporal Variations about Vegetation Fractional Cover in Urumqi City from 2000 to 2014

doi:10.13466/j.cnki.lyzygl.2016.04.017

Abstract

Abstract: Based on four periods of remote sensing images of TM/ETM+/OLI (2000,2006,2010 and 2014) and digital elevation model of ASTER GDEM,the vegetation fractional cover distribution maps in the four periods were got by conducting the pixel dichotomy model using NDVI (Normalized Difference Vegetation Index).Further,the vegetation coverage level maps in the four periods were overlaid with altitude map,slope gradient map and slope aspect map respectively.The map were generated using digital elevation model ASTER GDEM to calculate and analyze the distributions and variations of vegetation cover in the horizontal and vertical direction.Finally the temporal and spatial changes of vegetation fractional cover,the vegetation improvement/degradation and the driving forces were analyzed.Massive degradation and significant improvement like the shape of U and the 2006 as a turning point showed the trends of vegetation fractional cover in the four periods.Compared with 2006,the vegetation cover of temperate semi-shrubby and dwarf semi-shrubby desert region in the north of Urumqi County and in the northeast of Midong District were improved to some extent.And the vegetation cover of temperate dwarf semi-arboreou desert in the north of Midong District and temperate dwarf needlegrass,dwarf semi-shrubby desert steppe in Dabancheng District were improved more significantly in 2014.Therefore,the distributions and variations of vegetation cover in Urumqi city was affected by natural factors such as precipitation,terrain factors (elevation,slope,aspect) and vegetation cover type and so on,as well as anthropogenic factors including economic activity and ecological conservation program.Desert grassland coverage had stronger instability,which was coupled by natural and anthropogenic factors,so we should improve the level of protection.Especially,a variety of ecological protection projects of forestry and grass in recent years in Urumqi city were carried out on a large scale,which played a vital role in the promotion of vegetation fractional cover and improvement of the ecological environment of Urumqi city.

Key words: vegetation fractional cover, NDVI, change trends of vegetation, terrain factors, Urumqi

CLC Number:

TP79
S757.2

LI Peixian, ZHENG Jianghua, LIU Ping. Analysis of Spatial and Temporal Variations about Vegetation Fractional Cover in Urumqi City from 2000 to 2014[J]. FOREST RESOURCES WANAGEMENT, 2016, (4): 88-95.

References

[1] Gitelson A A,Kaufman Y J,Stark R,et al.Novel algorithms for remote estimation of vegetation fraction[J].Remote Sensing of Environment,2002,80(1):76-87.
[2] 李苗苗,吴炳方,颜长珍,等.密云水库上游植被覆盖度的遥感估算[J].资源科学,2004,26(4):154-159.
[3] 周伟,刚成诚,李建龙,等.1982—2010年中国草地覆盖度的时空动态及其对气候变化的响应[J].地理学报,2014,69(1):15-30.
[4] 刘宪锋,潘耀忠,朱秀芳,等.2000—2014年秦巴山区植被覆盖时空变化特征及其归因[J].地理学报,2015,70(5):705-716.
[5] 李登科,范建忠,王娟.陕西省植被覆盖度变化特征及其成因[J].应用生态学报,2010,21(11):2896-2903.
[6] 甘春英,王兮之,李保生,等.连江流域近 18 年来植被覆盖度变化分析[J].地理科学,2011,31(8):1019-1024.
[7] 贾宝全,邱尔发,张红旗.基于归一化植被指数的西安市域植被变化[J].林业科学,2012,48(10):6-12.
[8] 张飞,塔西甫拉提·特依拜,丁建丽,等.新疆典型盐渍区植被覆盖度遥感动态监测——以渭干河一库车河三角洲绿洲为例[J].林业科学,2011,47(7):27-35.
[9] 蔡朝朝,安沙舟,蒲智,等.基于TM NDVI的库尔勒市域植被覆盖动态变化[J].草业科学,2015,32(7):1069-1078.
[10] 熊玲,殷克勤,吴麟,等.乌鲁木齐地区生长季NDVI序列影像的植被覆盖变化分析[J].沙漠与绿洲气象,2011,5(6):54-58.
[11] 李妮,尹林克,王喜勇,等.乌鲁木齐主要植被类型及其分布[J].新疆农业科学,2009,46(4):818-823.
[12] 王新军,赵成义,杨瑞红,等.基于像元二分法的沙地植被景观格局特征变化分析[J].农业工程学报,2016,32(3):285-294.
[13] Qian Y,Zhou W,Li W,et al.Understanding the dynamic of greenspace in the urbanized area of Beijing based on high resolution satellite images[J].Urban Forestry & Urban Greening,2015,14(1):39-47.
[14] 胡玉福,邓良基,刘宇,等.基于RS和GIS的大渡河上游植被覆盖时空变化[J].林业科学,2015,51(7):49-59.
[15] Cantón Y,Del Barrio G,Solé~Benet A,et al.Topographic controls on the spatial distribution of ground cover in the Tabernas badlands of SE Spain[J].Catena,2004,55:341-365.
[16] 李海军,张毓涛,张新平,等.天山中部天然云杉林森林生态系统降水过程中的水质变化[J].生态学报,2010,30(18):4828-4838.
[17] 张毓涛,李吉玫,常顺利,等.天山中部天山云杉种群空间分布格局及其与地形因子的关系[J].应用生态学报,2011,22(11):2799-2806.
[18] 王晓杰.基于TRMM的天山山区降水降尺度方法及其空间变异特征研究[D].石河子大学,2013.
[19] 李毅,杨仁斌,伍格致,等.长株潭核心区植被覆盖度动态监测与分析[J].林业科学研究,2015,28(2):265-270.
[20] 孙红雨,王长耀,牛铮,等.中国地表植被覆盖变化及其与气候因子关系──基于NOAA时间序列数据分析[J].遥感学报,1998,2(3):204-210.
[21] 许旭,李晓兵,梁涵玮,等.内蒙古温带草原区植被盖度变化及其与气象因子的关系[J].生态学报,2010,30(14):3733-3743.
[22] 张卫东,张勇娟.新疆乌鲁木齐市达坂城区草地资源遥感调查情况分析[J].当代畜牧,2015(6):37-38.