Publications

Chen, A; Zhong, XZ; Wang, JL; Li, J (2025). Spatiotemporal patterns and driving forces of net primary productivity in South and Southeast Asia based on Google Earth Engine and MODIS data. CATENA, 249, 108689.

Abstract
Net primary productivity (NPP) plays a significant role in the vegetation development index, carbon sequestration potential and ecosystem productivity of terrestrial ecosystems for global ecosystem stability. South and Southeast Asian regions have complex and diverse terrestrial ecosystems, but information on the rates of NPP growth or degradation of vegetation is unreliable. Therefore, this study examines spatial and temporal variations in NPP and its driving forces in South and Southeast Asia at the regional scale from 2001 to 2021 and provides scientific support for the improvement and maintenance of vegetation ecosystems in South and Southeast Asia. This study used remotely sensed data and combined Sen's slope, the Mann-Kendall significance test and the Hurst exponent to analyse the past and future spatiotemporal patterns in NPP and used residual analysis to quantify how climate and human activities affect NPP in South and Southeast Asia. The results demonstrated that the average yearly NPP was 649.6 gC & sdot;m-2 & sdot;a- 1 (grams of carbon per square metre per year, gC & sdot;m-2 & sdot;a- 1 ), with an overall increase of 24.46 gC & sdot;m- 2 & sdot;a- 1 . In terms of spatial distribution, the maximum NPP was 1280.83 gC & sdot;m- 2 & sdot;a-1 in Laos, the minimum NPP was 81.19 gC & sdot;m-2 & sdot;a- 1 in Pakistan, and the NPP improvement area was larger than the degradation area. In the future, NPP will exhibit significant persistence characteristics, and by effectively protecting vegetation, NPP in South and Southeast Asia will tend to develop well. NPP was mainly negatively correlated with precipitation and temperature, and the relationship with temperature was more significant. Human activities are the dominant factor causing changes in NPP, which needs to be highly emphasized by the governments of South and Southeast Asian countries to formulate and improve vegetation protection policies.

DOI:
10.1016/j.catena.2024.108689

ISSN:
1872-6887