Analysis on dynamic characteristics of spatio-temporal variations of vegetation coverage in Zimbabwe in recent 20 years

doi:10.14088/j.cnki.issn0439-8114.2022.09.009

Abstract

Abstract: Vegetation coverage is an important parameter that reflects ecological environment. Zimbabwe is one of the most important partners in the Belt and Road, and the observation of vegetation coverage is of great significance to the regional ecological environment and economic construction. With the adoption of MODIS NDVI data, the dimidiate pixel model, one element linear regression, and Hurst index method were used to analyze and predict the changes of vegetation coverage in Zimbabwe from 2001 to 2019. The results showed that the vegetation coverage in Zimbabwe was favorable. Vegetation coverage increased in 2001—2009, 2015—2017, and then it decreased in 2009—2015, 2017—2019; From the distribution of vegetation coverage, it showed obvious regional differentiation characteristics, the vegetation coverage of the north region occupied a larger proportion than the southwest and middle region. The mainly spatial trends were insignificant, the areas accounted for 81.70%, while the areas of increase were 11.52%, and 6.78% of the vegetation covered areas were decreased. The result of the linear regression and Hurst index method indicated that the status was a negative sustainable development. 7.44% of the vegetation covered areas were increased, and the areas with a decrease were occupied 9.69%. The precipitation and temperature were considerably positively correlated with the vegetation coverage, the precipitation was the main factor for variation of vegetation coverage in Zimbabwe. Vegetation coverage was correlated with nighttime light, the mainly negative correlation regions were Harare and Bulawayo, and the mainly positive correlation region was Matabeleland.

Key words: vegetation coverage, variation, driving factor, nighttime light, Zimbabwe

CLC Number:

P237
Q948.11

DONG Ming-xia, WANG Li-hui, WANG Kan, YANG Qi-chi, LU Li-jie, HUANG Jin-liang. Analysis on dynamic characteristics of spatio-temporal variations of vegetation coverage in Zimbabwe in recent 20 years[J]. HUBEI AGRICULTURAL SCIENCES, 2022, 61(9): 48-55.

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