Study on spatio-temporal dynamics and driving factors of NPP in Central Asian grassland
Received date: 2021-07-20
Revised date: 2022-01-09
Online published: 2022-05-30
Based on the CASA and Miami models, the net primary productivity (NPP) of five Central Asian countries (Kazakhstan, Tajikistan, Kyrgyzstan, Turkmenistan, and Uzbekistan) was calculated in this study. The purpose was to explore the Spatio-temporal dynamics and driving factors of NPP in Central Asian grassland from 2001 to 2019. The results showed that the average ANPP of grassland in Central Asia from 2001 to 2019 was 118.9 g C·m-2·a-1. On the spatial scale, the ANPP of grassland in the plain area increased gradually from south to north with increasing latitude. In contrast, the ANPP of grassland from plain to mountain grassland increased with increasing altitude. On the temporal scale, the overall growth trend of ANPP was not significant, and the future change trend of grassland ANPP in approximately 60% of the region was opposite to that of the past. The trend was not significant in the region of Central Asia with increased grassland ANPP where human activities are dominant and with decreased grassland ANPP, with climate change as the main driving force. A significant positive correlation existed between ANPP and precipitation accounting for 67.8%, with no significant relationship between temperature and the change of ANPP in Central Asian grassland. Therefore, precipitation is the main climatic factor affecting the change of ANPP in Central Asian grassland.
Key words： NPP; Central Asia; grassland; change trend; climate change; human activities
ZHANG Yunxin,HAO Haichao,FAN Lianlian,LI Yaoming,ZHANG Renping,LI Kaihui . Study on spatio-temporal dynamics and driving factors of NPP in Central Asian grassland[J]. Arid Zone Research, 2022 , 39(3) : 698 -707 . DOI: 10.13866/j.azr.2022.03.04
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