| 1982-2006年中国东部春季植被变化的区域差异 |
| |
| 引用本文： | 张学珍,戴君虎,葛全胜.1982-2006年中国东部春季植被变化的区域差异[J].地理学报,2012,67(1):53-61. |
| |
| 作者姓名： | 张学珍 戴君虎 葛全胜 |
| |
| 作者单位： | 中国科学院地理科学与资源研究所,北京,100101 |
| |
| 基金项目： | 全球变化研究国家重大科学研究计划，国家自然科学基金 |
| |
| 摘 要： | 分析了中国东部1982-2006年4-5月归一化差值植被指数(NDVI)的空间格局和变化趋势空间分布,通过聚类分析辨识了植被活动变化过程的主要模态,并探讨了他们与温度和降水变化的相关关系.结果表明:(1)多年平均的春季植被活动呈现南强北弱的分布特征,由强到弱的过渡带大约位于34°～39°N；(2) 1982-2006年,华北平原、呼伦贝尔草原和洞庭湖平原的春季植被活动呈显著增强的趋势,其中华北平原NDVI增速高达0.03/10年(r2=0.52；p＜0.001),长三角和珠三角地区则呈显著减弱的趋势,其中长三角地区NDVI减速达-0.016/10年(r2=0.24;p=0.014); (3) 1982-2006年春季植被活动变化过程的区域差异鲜明,并呈现层次性特征,首先是长三角和珠三角与其他地区的差异,前者呈减弱趋势,后者呈增强趋势,其次是呼伦贝尔草地、华北以及江南一华南地区与东北地区、内蒙古东部和东南部及长江下游地区的差异,前者持续增强,后者以1998年为分界点先增强后减弱,再次是各个模态年际变率的差异；(4)半湿润一半干旱的草地和农田区植被活动与降水量变化显著正相关,半湿润一湿润的森林区植被活动与温度变化显著正相关,温度或者降水最高能解释NDVI 60％的方差.
|
| 关 键 词： | 中国东部 春季 植被活动 区域差异 NDVI |
Spatial Differences of Changes in Spring Vegetation activities across Eastern China during 1982-2006 |
| |
| ZHANG Xuezhen
,
DAI Junhu
,
GE Quansheng.Spatial Differences of Changes in Spring Vegetation activities across Eastern China during 1982-2006[J].Acta Geographica Sinica,2012,67(1):53-61. |
| |
| Authors: | ZHANG Xuezhen DAI Junhu GE Quansheng |
| |
| Institution: | (Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China) |
| |
| Abstract: | To understand the spatial differences of changes in spring vegetation activities across eastern China during 1982-2006, we analysed the mean spatial pattern of Normalized Differences Vegetation Index in spring and spatial pattern of linear trend of changes in spring NDVI, identified the models of spring vegetation activities changes through the clustering analysis and calculated the correlations coefficients between spring NDVI and temperature and precipitation variations. It was found that vegetation activities decreased from south to north with an abrupt decrease at 34°-39° N. The transition belt was derived from natural vegetation distribution, but the south-north grads in the transition belt were enhanced by anthropogenic cropland. Across eastern China, spring vegetation activities had trends of significant increase in the North China Plain, Hulun Buir area and Dongting Lake Plain, and the North China Plain had the greatest rate of 0.03 NDVI per decade (r2 = 0.52; p < 0.001); while, spring vegetation activities had trends of significant decrease in the Yangtze River Delta and Pearl River Delta, and Yangtze River Delta had the greatest rate of -0.02NDVI per decade (r2 = 0.24; p = 0.014). The vegetation activities variations across eastern China had evident spatial heterogeneities. The spatial heterogeneities were primarily featured by differences between a decreasing trend in the Yangtze River Delta and Pearl River Delta and an increasing trend in other areas. The secondary differences were the differences between persistent increasing trend during 1982-2006 in the North China Plain, Hulun Buir area and south of Yangtze River to South China and breaking increase after 1997-1998 in Northeast China, eastern part of Inner Mongolia Plateau and lower reaches of the Yangtze River. The third and lower level differences were interannual variabilities differences among the regions. |
| |
| Keywords: | eastern China spring vegetation activities spatial differences NDVI |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
| 点击此处可从《地理学报》浏览原始摘要信息 |
| 点击此处可从《地理学报》下载免费的PDF全文 |
|
