运用1 km分辨率经过Savitzky-Golay滤波技术平滑处理的SPOT/VGT数据,通过对1998~2007年的归一化植被指数(NDVI)时间序列数据、NDVI与气象因子的关系、10 a来NDVI变化率的空间分布以及NDVI与海拔高度的关系等进行分析,研究重庆市植被变化及空间分布情况。结果表明,重庆市NDVI年变化相对稳定,在空间上变化较大,东北及东南部分地区植被退化,而西部地区NDVI变化率增加,表明植被覆盖有所增多。另外引起NDVI时空变化的原因中,温度远大于降水量,海拔高度也与NDVI有较好的相关性。
The article researched the vegetation changes in the Three Gorges Reservoir Area of Chongqing through analysing the time series of NDVI data in 1998-2007, the relationship of the NDVI with meteorological factors, the change rate of NDVI and the relationship between NDVI altitude by using the 1 km SPOT/VGT-NDV I data smoothed by Savitzky-Golay filter. The results show that the annual NDVI variation in the Three Gorges Reservoir Area of Chongqing is relatively stable, while it decreases in the northeastern and southeastern areas and increases in the western area. Furthermore, the spatial and temporal changes of NDVI are mainly caused by temperature and precipitation. The temperature plays a more important role than precipitation in NDVI’s change, the altitude and NDVI also has a better correlation.
[1] 王天巍,史志华,李朝霞,等.基于多源数据的重庆市乐天溪流域林地植被覆盖动态监测[J].应用生态学报,2007,18(11):2533~2539.
[2] 第宝锋,杨国忠,艾南山,等.基于RS与GIS的金沙江干热河谷区退化生态系统评价——以云南省元谋县为例[J].地理科学,2005,25(4):484~489.
[3] 向 波,缪启龙.青藏高原气候变化与植被指数的关系研究[J].四川气象,2001,21(1):29~36.
[4] 杜子涛,占玉林.基于NDVI 序列影像的植被覆盖变化研究[J].遥感技术与应用,2008,23(1):47~50.
[5] 张友水,谢元礼.MODIS影像的NDVI和LSWI植被水分含量估算[J].地理科学,2008,28(1):72~76.
[6] 刘传胜,张万昌,雍 斌.基于两种新型景观指数的张掖绿洲植被格局动态研究[J].地理科学,2008, 28(1):59~65.
[7] 吴炳方,张 峰,刘成林,等.农作物长势综合遥感监测方法[J].遥感学报,2004,8(6):498~514.
[8] 张 峰,吴炳方,罗治敏,等.美国冬小麦产量遥感预测方法[J].遥感学报,2004,8(6):611~617.
[9] Luciano Telesca,Rosa Lasaponara. Quantifying intra-annual persistent behaviour in SPOT-VEGETATION NDVI data for Mediterranean ecosystems of southern Italy[J].Remote Sensing of Environment,2006,101:95-103.
[10] 卓 莉,曹 鑫.锡林郭勒草原生态恢复工程效果的评价[J].地理学报,2007,62(5):471~480.
[11] LI Yuechen.Land cover dynamic changes in northern China:1989-2003[J].Journal of Geographical Sciences,2008,18:85-94.
[12] 曾永年,向南平,冯兆东,等.Albedo-NDVI特征空间及沙漠化遥感监测指数研究[J].地理科学,2006,26(1):75~81.
[13] 顾 娟,李 新.NDVI 时间序列数据集重建方法述评[J].遥感技术与应用,2006,21(4):391~395.
[14] Chen J,Jonsson P,TamuraM,et al.A simp a set based on the Savitzky-Golay filter. Rem ote Sens Environ,2004,91:332-344.
[15] SavitzkyA,GolayM J E.Smoothing and differentiation of data by simp lified least squares procedures[J].Anal Chem,1964,36:1627-1639.
[16] 朱晓禧,方修琦,王 媛.基于遥感的黑龙江省西部水稻、玉米种植范围对温度变化的响应[J].地理科学,2008,28(1):66~71.
[17] 李小强,赵宏丽,闫敏华.东北三江平原全新世火演化及其与植被和气候的关系[J].地理科学,2005,25(2):177~182.
