摘要
利用1998-2012年生长季的SPOT-VGT NDVI数据集和气温降水数据,应用最大值合成法、平均值法、一元线性回归分析法、相关系数、偏差和标准差,分析了河北省植被生长季NDVI的时空变化及与气候因子的关系。结果表明:1998-2012年15年间河北省植被生长季内NDVI值呈波动上升趋势,最小NDVI值为1999年的0.49,最大NDVI值为2012年的0.59。在每年的植被生长季内,6到7月NDVI增长最快,8月达到最大值0.70,9月NDVI开始下降。河北省NDVI空间分布呈现由中部向两边减少的趋势。植被生长季NDVI 15年平均最高值达0.77,出现在燕山山脉的雾灵山附近;最低值为0.01,出现在沧州东部沿海。1998-2012年间河北省植被生长季NDVI总体上呈现增加的趋势,NDVI减少的区域占9.16%,增加的区域90.84%。生长季平均NDVI与平均降水呈正相关,R2为0.7976;与平均气温呈负相关关系,R2为0.2076。1999-2002、2006-2007年生长季NDVI均值低于15年均值,其余年份均高于15年均值。张家口中部大部分地区、承德北部和东部一小部分、沧州东部大部分地区及衡水的中北部大部分地区植被覆盖变化程度较大,其中唐山是由于NDVI下降引起的植被覆盖变化程度较大,其它地区是由于NDVI上升。
This paper used SPOT-VGT NDVI datasets and climatic data including air temperature and precipitation in growing seasons from 1998 to 2012 and the methods of maximum value composite （MVC）, average, linear regression, deviation and standard deviation to analyze the spatial and temporal changes of NDVI and relationships with climatic factors The results showed that vegetation NDVI in growing seasons showed a trend of fluctuating increase from 1998 to 2012. The lowest annual average NDVI in growing seasons was 0.49 in 1999 and the highest was 0.59 in 2012. During growing seasons, NDVI increased quickly from June to July, reached the highest 0.70 in August and began to decrease in September. The spatial distribution of NDVI in Hebei Province presented the trend of decrease from the middle part to both sides. The highest average NDVI in growing seasons for these 15 years was 0.77, appeared near Wuling Mountain of Yanshan Mountains, the lowest NDVI was 0.01, appeared in eastern coast of Cangzhou region. NDVI in growing seasons showed an increasing trend in Hebei Province from 1998 to 2012, the area of NDVI decrease accounted for 9.16%, while that of NDVI increase accounted for 90.84%. The average NDVI was positively correlated to the average precipitation, the correlation coefficient was 0.7976, while negatively correlated to the average air temperature, and the correlation coefficient was 0.2076. The average NDVI in growing seasons in 1999-2002 and 2006-2007 were lower than the average of 15 years, and vise verse in other years. The degrees of vegetation cover change was high in the most parts of Middle Zhangjiakou region, a small part of North and East Chengde region, most parts of East Cangzhou region and Mid-North Hengshui region, the reasons are NDVI decrease in Tangshan and NDVI increase in other areas.
出处
《科技通报》
北大核心
2015年第5期47-52,共6页
Bulletin of Science and Technology
基金
河北省自然科学基金项目(D2012205084)
河北师范大学重点基金(L2009Z08)
自然地理学省级重点学科项目
关键词
气候因子
偏差
标准差
时空变化
SPOT-VGT NDVI
SPOT-VGT NDVI
climatic factors
deviation
standard deviation
spatial and temporal change
