%0 Journal Article %A CHEN Yanli %A TANG Meirong %A ZHANG Hui %A MO Jianfei %A QIAN Shuan %T Response difference of fractional vegetation cover and net primary productivity to SPEI drought index in karst areas of Guangxi %D 2022 %R 10.11755/j.issn.1006-7639(2022)-06-1042 %J Journal of Arid Meteorology %P 1042-1050 %V 40 %N 6 %X

Drought is one of the most important meteorological disasters affecting vegetation in karst areas of Guangxi, and a reasonable remote sensing vegetation parameter can address the impact of drought on vegetation more objectively. To quantify the response of vegetation to drought, fractional vegetation cover (FVC) and net primary productivity (NPP) were selected to analyze the responses to standardized precipitation evapotranspiration index (SPEI) under different topography conditions and forest species. The results are as follows: (1) The responses of FVC and NPP to SPEI were significantly different in karst areas of Guangxi. The response of FVC and NPP to SPEI showed the highest consistency in spring, followed by summer and then autumn. (2) The difference of the response of different forest species to SPEI was small on an annual scale, but was large on a seasonal scale. At annual time scale, the response sensitivity for FVC to SPEI from large to small was economic forest, eucalyptus forest, pine forest, broad-leaved forest, Chinese fir forest, shrub forest, bamboo forest, and for NPP was economic forest, pine forest, eucalyptus forest, broad-leaved forest, Chinese fir forest, shrub forest, bamboo forest. The economic forest was most sensitive to SPEI and the bamboo forest was least. At the seasonal time scale, the sensitivity of FVC and NPP of eucalyptus forest in summer and broad-leaved forest in autumn to SPEI was lowest, and that of eucalyptus forest was highest in winter. (3) The response of vegetation under different terrain conditions to SPEI was also different, but it was smaller than that of different forest species. At annual time scale, the sensitivity of FVC to SPEI from large to small was plain, mountain region, alpine, and for NPP was plain, alpine, mountain region. The response sensitivity to SPEI was highest in the plain area for both FVC and NPP. At seasonal time scale, the response sensitivity of FVC and NPP to SPEI in different terrain conditions was only different in summer and winter. For FVC, its response to SPEI in summer was greater in plain than in mountain region and in winter was greater in plain than in alpine, and for NPP was opposite.

%U http://www.ghqx.org.cn/EN/10.11755/j.issn.1006-7639(2022)-06-1042