以TM影像为数据源,运用基于NDVI的像元二分模型,计算和分析连江流域1988和2006年植被演变特点及空间分布特征,并将两期影像的植被覆盖度图与连江流域分岩溶区地质图进行叠加,进而分析地质构造对植被覆盖度的影响。结果表明:①受气候及与人文因素的影响,1988~2006年连江流域植被覆盖度有所增加。表现为较高和高植被覆盖区面积增加,低、较低和中度植被覆盖区面积减少。②受地质构造影响,非岩溶区的植被质量优于岩溶区。③在空间分布上,近18a来连江流域植被覆盖度的变化较显著。
With TM images as a data source, this paper calculates and analyses the characteristics of change and spatial distribution about the vegetation in Lianjiang watershed in 1988-2006 by using the dimidiate pixel model based on NDVI. Overlaying the vegetation coverage map and the sub-karst geological map, the impact on vegetation coverage exerted by geological structure is analyze. The results can be described in the following three aspects. 1) Because of the effect of climate and human activities, the vegetation coverage in Lianjiang River watershed got a rise in 1988-2006. The area of higher and high vegetation coverage districts increased, while that of low, lower and middle vegetation coverage districts decreased. 2) The quality of vegetation in non-karst district was better than that in karst district due to the influence of geological formation. 3) The change of vegetation coverage’s spatial distribution was significant in Lianjiang River watershed during the recent 18 years.
[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] 章文波,符素华,刘宝元.目估法测量植被覆盖度的精度分析[J].北京师范大学学报(自然科学版),2001,37(3):402~408.
[3] 祁 燕,王秀兰,冯仲科,等.基于RS与GIS的北京市植被覆盖度变化研究[J].林业调查规划,2009,34(2):1~4.
[4] 马志勇,沈 涛,张军海,等.基于植被覆盖度的植被变化分析[J].测绘通报,2007(3):45~48.
[5] 张春玲,余 华,宫 鹏,等.武汉市地表亮温与植被覆盖关系定量分析[J]. 地理科学,2009,29(5):740~744
[6] 颜长珍,吴炳方.晋陕蒙接壤区林草覆盖变化的遥感分析[J].地理科学,2004,24(4):465~471.
[7] 张云霞,李晓斌,陈云浩.草地植被覆盖度的多尺度遥感与实地测量方法综述[J].地球科学进展,2003,18(1):85~93.
[8] 陈 晋,陈云浩,何春阳,等.基于土地覆盖分类的植被覆盖率估算亚像元模型与应用[J].遥感学报,2001,5(6):416~422.
[9] Purevdo r J S,Tateishi R,Ishiyama T,et al. Relationship s between percent vegetation cover and vegetation indices[J].International Journal of Remote Sensing,1998,19 (18) :3519-3535.
[10] 万恩璞,吕宪国,王野乔,等.应用遥感信息对长白山植被覆盖的研究[J].地理科学,1989,9(4):354~387.
[11] 孙 睿,刘昌明,朱启疆.黄河流域植被覆盖度动态变化与降水的关系[J].地理学报,2001,56(6):667~672.
[12] 赵彩霞,郑大伟,何文清.植被覆盖度的时间变化及其防风蚀效应[J].植物生态学报,2005,29(1):68~73.
[13] Amiri R,Weng Q,Alimohammadi A.Spetial-temporal dynamics of land surface temperature in relation to fractional vegetation cover and land use/cover in the Tabriz urban area,Iran[J].Remote Sensing of Environment,2009,113(12):2606-2617.
[14] 邹 鸣.连江流域水文特性分析[J].广东水利水电,2005,(6):74~75.
[15] 赵英时.遥感应用分析原理与方法[M].北京:科学出版社,2003:387~398.
[16] 李惠敏,刘洪斌,武 伟.近10年重庆市归一化植被指数变化分析[J].地理科学,2010,30(1):119~123.
[17] 李苗苗.植被覆盖度的遥感估算方法研究.中国科学院遥感应用研究所,2003:1~111.
[18] Gutman G G.Vegetation indices from AVHRR:An update and future prospects[J].Remote Sensing of Environment,1991,35(2-3) :121-136.
[19] 广东农村统计年鉴编辑委员会编纂.广东农村统计年鉴[M].北京:中国统计出版社,2007:83~220.
[20] 万 军,蔡运龙,张惠远,等.贵州省关岭县土地利用、土地覆被变化及土壤侵蚀效应研究[J].地理科学,2004,24(5):573~579.
[21] 魏兴琥,李 森,罗红波,等.粤北石漠化过程土壤与植被变化及其相关性研究[J].地理科学,2008,28(5):662~666.
