| 重庆市植被覆盖变化及其与气候因子的关系 |
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| 引用本文： | 魏来,李忠峰,李学梅.重庆市植被覆盖变化及其与气候因子的关系[J].广东农业科学,2013,40(12):185-188. |
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| 作者姓名： | 魏来 李忠峰 李学梅 |
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| 作者单位： | 重庆师范大学地理与旅游学院,重庆,400047 |
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| 基金项目： | 国家自然科学基金，重庆市自然科学基金，重庆师范大学基金 |
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| 摘 要： | 利用2000-2011年MODIS归一化植被指数(NDVI)数据分析了重庆市植被覆盖的空间特征和变化规律,并结合气象数据分别从不同空间和时间尺度上分析了植被覆盖变化与气候因子的关系.结果表明:(1)2000-2011年,重庆市植被覆盖整体上呈上升趋势,冬、春、秋季植被覆盖增长较明显;(2)从空间变化趋势上看,渝东北和渝东南地区植被覆盖增加明显,而主城9区以及区县的中心城镇地区植被覆盖减少;(3)重庆市NDVI与温度的相关性大于与降水的相关性,在空间上年均NDVI与年均降水和温度正、负相关性并存,显著正相关区域大于显著负相关的区域,但大部分地区的相关性并不显著;(4)温度和降水对植被生长均具有一定的时滞效应,其中降水的时滞效应更加显著.
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| 关 键 词： | 重庆 植被覆盖 NDVI 气候因子 相关性 |
Vegetation cover changes and its relation with
climate factors in Chongqing |
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| WEI Lai
,
LI Zhong-feng
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LI Xue-mei.Vegetation cover changes and its relation with
climate factors in Chongqing[J].Guangdong Agricultural Sciences,2013,40(12):185-188. |
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| Authors: | WEI Lai LI Zhong-feng LI Xue-mei |
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| Abstract: | In this paper, we analyzed the spatial characteristics and the changes rule of vegetation coverage based on the 250 mMODIS-NDVI data from 2000 to 2011 in Chongqing, and investigated its relation with climate factors in different time and space scale,by integrating NDVI with climate data. The results as follow:(1)The vegetation cover presented entirely an upward trend. Among the seasonal variation, vegetation coverage increased obviously in winter, spring and autumn. (2)From the trend of spatial variation, vegetation coverage increased significantly in the northeastern and southeastern of Chongqing, while it reduces in the metropolitan and the center town area. (3)The correlation of NDVI and temperature was greater than the correlation with precipitation. The positive correlation and negative correlation of annual average NDVI and annual average precipitation and temperature were coexistence in Chongqing area. The significant positive correlation region was larger than the significant negative correlation area. But the correlation was not significant in most regions. (4)There was a certain time lag effect of temperature and precipitation on vegetation growth, the time-delay effect of precipitation was more obvious. |
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