DOI: 10.3724/SP.J.1148.2011.00010

Arid Zone Research (干旱区研究) 2011/28:1 PP.10-16

NDVI-based Interannual and Seasonal Variations of Vegetation Activity in Xinjiang during the Period of 1982-2006

Interannual and seasonal variations of vegetation activity in Xinjiang during the period from 1982 to 2006 were studied using the time series data of normalized difference vegetation index (NDVI) derived from remote sensing images (NOAA/AVHRR), information of vegetation distribution and observed climatic data. The results show that the NDVI in growth season (from April to October) increased significantly in 27% of the study area but decreased in 4% of the study area in recent 25 years. The area with a high NDVI (>0.3) in growth season was enlarged by 5% during the period of 2002-2006 compared with that in the 1980s (1982-1986), and the area with a low NDVI (<0.1) in growth season was reduced by 5%. Seasonal NDVI in Xinjiang increased significantly in spring, summer and autumn in recent 25 years. Seasonal variation of NDVI reveals that the NDVI increase in autumn was the most significant (P<0.01), and the mean increase rate was 0.57%. However, the seasonal NDVI varied from different vegetation types. NDVI of grasslands and desert vegetation increased significantly in spring, summer and autumn, that of crops increased significantly in summer and autumn, especially in summer (increased by 1%/a), but that of forests increased significantly only in autumn. Therefore, our study suggests that the overtime of growth season and acceleration of plant growth were the main factors resulting in the increase of vegetation activity in Xinjiang, and the increase of temperature, rainfall in summer and agricultural practices might be the important driving factors.

Key words:NDVI,interannual variation,seasonal difference,vegetation activity,Xinjiang

ReleaseDate:2014-07-21 15:54:25

[1] IPCC.Climate Change 2001:Impact, Adaptation, and Vulnerability[M].Cambridge:Cambridge University Press,2001.

[2] Myneni R B,Keeling C D,Tucker C J,et al.Increased plant growth in the northern high latitudes from 1981-1991[J].Nature,1997,386:698-702.

[3] Myneni R B,Tucker C J,Asrar G,et al.Interannual variations in satellite-sensed vegetation index data from 1981-1991[J].Journal of Geophysical Research,1998,103:6 145-6 160.

[4] Zhou L M,Tucker C J,Kaufmann R K,et al.Variations in northern vegetation activity inferred from satellite data of vegetation index during 1981 to 1999[J].Journal of Geophysical Research,106(D17):20 069-20 083.

[5] 方精云,朴世龙,贺金生,等.近20年来中国植被活动在增强[J].中国科学:C 辑,2003,33(6):554-565.[Fang Jingyun,Piao Shilong,He Jingsheng,et al.Increasing terrestrial vegetation activity in China,1982-1999[J].Science in China:Ser.C,2003,33(6):554-565.]

[6] Piao S L,Fang J Y,Zhou L M,et al.Interannual variations of monthly and seasonal normalized difference vegetation index (NDVI) in China from 1982 to 1999[J].Journal of Geophysical Research,108 (D14),4401,doi:10.1029/2002JD002848.

[7] Potter C,Kumar V,Klooster S,et al.Recent history of trends in vegetation greenness and large-scale ecosystem disturbances in Eurasia [J].Tellus B-Chemical and Physical Meteorology,2007,59:260-272.

[8] 施雅风,沈永平,胡汝骥.西北气候由暖干向暖湿转型的信号、影响和前景初步探讨[J].冰川冻土,2002,24(3):219-226.[Shi Yafeng,Shen Yongping,Hu Ruji.Preliminary study on signal,impact and foreground of climatic shaft from warm-dry to warm-wet in Northwest China[J].Journal of Glacialogy and Geocryology,2002,24(3):219-226.]

[9] 施雅风,沈永平,李栋梁,等.中国西北气候由暖干向暖湿转型的特征和趋势探讨[J].第四纪研究,2003,23(2):152-164.[Shi Yafeng,Shen Yongping,Li Dongliang,et al.Discussion on the presentclimate change from warm-dry to warm-wet in northwest China[J].Quaternary Sciences,2003,23(2):152-164.]

[10] 马明国,董立新,王雪梅.过去21 a中国西北植被覆盖动态监测与模拟[J].冰川冻土,2003,25(2):232-236.[Ma Mingguo,Dong Lixin,Wang Xuemei.Study on the dynamically monitoring and simulating the vegetation cover in Northwest China in the past 21 years [J].Journal of Glacialogy and Geocryology,2003,25(2):232-236.]

[11] 邓朝平,郭铌,王介民,等.近20 余年来西北地区植被变化特征分析[J].冰川冻土,2006,28(5):686-693.[Deng Zhaoping,Guo Ni,Wang Jieming,et al.Vegetation cover variation in northwest China during the past 22 years[J].Journal of Glacialogy and Geocryology,2006,28(5):686-693.]

[12] 师庆东,肖继东,潘晓玲,等.近20 a来新疆植被覆盖变化特征研究[J].干旱区研究,2004,21(4):389-394.[Shi Qingdong,Xiao Jidong,Pan Xiaoling,et al.Study on the change of vegetation coverage in Xinjiang since recent 20 years[J].Arid Zone Research,2004,21(4):389-394.]

[13] 中国科学院中国植被图编辑委员会.中国植被图集[M].北京:科学出版社,2001.[Editorial Committee for Vegetation Map of China.Vegetation Atlas of China[M].Beijing :Science Press,2001.]

[14] 倪永明,欧阳志云,胥彦玲,等.基于地形因素的新疆荒漠植被-气候模型应用研究[J].西北植物学报,2006,26(6):1 236-1 243.[Ni Yongming,Ouyang Zhiyun,Xu Yanling,et al.Application of landform-based desert vegetation-climate model in Xinjiang Uygur Autonomous Region[J].Acta Botanica Boreali-Occidentalia Sinica,2006,26(6):1 236-1 243.]

[15] 胡汝骥,樊自立,王亚俊,等.近50 a新疆气候变化对环境影响评估[J].干旱区地理,2001,24(2):97-103.[Hu Ruji,Fan Zili,Wang Yajun,et al.Assessment about the impact of climate change on environment in Xinjiang since recent 50 years[J].Arid Land Geography,2001,24(2):97-103.]

[16] 胡汝骥,姜逢清,王亚俊.新疆雪冰水资源的环境评估[J].干旱区研究,2003,20(3):187-191.[Hu Ruji,Jiang Fengqing,Wang Yajun.Assessment on the glacial water resources in Xinjiang,China[J].Arid Zone Research,2003,20(3):187-191.]

[17] 吴素芬,何文勤,胡汝骥,等.近年来新疆盆地平原区域湖泊变化原因分析[J].干旱区地理,2001,24(2):123-129.[Wu Sufen,He Wenqin,Hu Ruji,et al.Analysis on the changing causes of the lakes in the basins and the plains in Xinjiang since recent years[J].Arid Land Geography,2001,24(2):123-129.]

[18] Barber V A,Juday G P,Finney B P.Reduced growth of Alaska white spruce in the twentieth century from temperature induced drought stress[J].Nature,2000,405:668-672.

[19] Ren J,Liu H,Yin Y,et al.Drivers of greening trend across vertically distributed biomes in temperate arid Asia [J].Geophysical Research Letters,34,L07707,doi:10.1029/2007GL029435.

[20] 丁建丽,塔西甫拉提·特依拜,熊黑钢,等.塔里木盆地南缘绿洲荒漠化动态变化遥感研究——以策勒县为例[J].遥感学报,2002,6(1):56-62.[Ding Jianli,Tashpolat·Tiyip,Xiong Heigang,et al. Study of oasis desertification dynamic change in the south of Tarim Basin [J].Journal of Remote Sensing,2002,6(1):56-62.]

[21] 郭柯,郑度.西昆仑、西喀喇昆仑和西北喜马拉雅地区植被的地域分异及其指示意义[J].植物生态学报,2002,26(1):17-22.[Guo Ke,Zheng Du.Regional differentiation of vegetation on the west Kunlun,the west Karakorum,and the north-west Himalaya and the implication for the ecological environment [J].Acta Phytoecologica Sinica,2002,26(1):17-22.]

[22] Zhao W Y,Li J L,Qi J G.Changes in vegetation diversity and structure in response to heavy grazing pressure in the northern Tianshan Mountains,China [J].Journal of Arid Environments,2007,68:465-479.