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Research on Vegetation Cover Change and Correlation with Climate Factors in Huanghe-Huaihe-Haihe River Basin

Author: MoYao
Tutor: ZhengYouFeiï¼›ChenHuaiLiang
School: Nanjing University of Information Engineering
Course: Atmospheric Physics and Atmospheric Environment
Keywords: Vegetation cover Remote sensing NDVI Huang-Huai River Basin Climate
CLC: P461.7
Type: Master's thesis
Year: 2007
Downloads: 203
Quote: 4
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Abstract


1982 to 2003, the NOAA / AVHRR NDVI data sets , using the mean method , simple differential one yuan linear regression , principal components analysis method to analyze the characteristics of the dynamic changes of the Huang-Huai River region vegetation cover and its spatial distribution , and then combine climate data on the relationship between vegetation NDVI and climatic factors in the study area . This study reveals the Huang-Huai River region vegetation variation and its relationship with climatic factors for the region of vegetation ecological and environmental protection and research has important reference significance . The main findings of this paper are as follows : 1) from 1982 to 2003 , the vegetation of the study area as a whole showed a rising trend , the slope of the linear regression trend annual average NDVI 0.0007 . Spring study area vegetation average NDVI increasing trend in the most significant increase in the rate of the fastest of the season , and the slope of the linear trend 0.0019 . From the spatial distribution of the annual average NDVI significantly increased the area is relatively large, accounting for 26.41% , while significantly reducing the area of only 1.86% , shows that 22 years in the study area vegetation activity enhanced . 2 ) the annual average of the different types of vegetation NDVI showed an increasing trend , just change different magnitude , two crops a year of floods, droughts and even for the increase rate of the crop , the linear trend slope is 0.0011 . Season spring vegetation types showed a rising trend , and the summer deciduous broadleaf forest , shrub , two crops a year , and flood and drought cooked even for crops declining vegetation types showed an upward trend , the fall is only one downward trend in two crops NDVI , evergreen coniferous forest winter only consider the NDVI upward trend . 3 , the annual precipitation , temperature and vegetation NDVI dynamic changes were positively correlated , in which the temperature and NDVI greater extent than the relevance of the precipitation and NDVI , the temperature sensitivity of the vegetation of the study area is higher than the sensitivity of precipitation . 4) spring and summer NDVI and temperature was significantly positively related to larger areas , accounted for 18.65% and 16.68% , respectively , and precipitation was significantly positively related to the region accounted for 7.19% and 9.04% , respectively , located more concentrated . Fall NDVI with temperature and precipitation was significantly related area less dispersed distribution .

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CLC: > Astronomy,Earth Sciences > Atmospheric science (meteorology ) > Climatology > Climate formation and influence of climatic factors > Plants and forests on climate
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