Spatiotemporal Evolution Characteristics of Forest Net Primary Productivity in Greater Khingan Mountains of Inner Mongolia and Its Response to Climate Factors

doi:10.11924/j.issn.1000-6850.casb2026-0145

Abstract

Abstract:

To clarify the spatiotemporal variation characteristics of forest net primary productivity (NPP) in the Greater Khingan Mountains of Inner Mongolia and its response patterns to climate change from 2010 to 2022, this paper quantitatively analyzed the spatiotemporal evolution pattern of forest NPP and the climate-driven effects in this region based on MOD17A3H remote sensing data and meteorological observation data, using methods including trend analysis and partial correlation analysis. The results showed that the interannual variation of forest NPP in the Greater Khingan Mountains of Inner Mongolia exhibited an upward trend, ranging from 331.04 to 456.45 gC/(m²·a), with an annual increasing rate of 12.7 gC/(m²·a). Spatially, it presented an overall decreasing pattern of “high in the north and low in the south”, and the low-value zones were concentrated in the southern forest-steppe ecotone. The air temperature in the Greater Khingan Mountains forest area showed a slowly fluctuating upward trend, while precipitation displayed a slowly fluctuating downward trend; both factors featured significant spatial heterogeneity and exerted complementary regulatory effects on NPP. The spatial distribution of partial correlation coefficients presented a pattern of “high in the south and low in the north”, with precipitation being the dominant factor driving NPP variation. Precipitation therefore acted as the dominant climatic factor for NPP changes in this forest zone, and the synergistic effect of air temperature and precipitation shaped the spatiotemporal differentiation pattern of NPP. The regional forest ecosystem was generally stable and improving, and ecological protection projects had a significant promoting effect on productivity enhancement. The findings can provide a scientific basis for forest carbon sink management, ecological protection and restoration, as well as the formulation of climate change response strategies in the Greater Khingan Mountains of Inner Mongolia.

Key words: Greater Khingan Mountains Forest of Inner Mongolia, NPP, spatiotemporal variation characteristics, climate factors, response

CLC Number:

P237，S718.55

ZHANG Lanbiao, ZHANG Lanjing, LI Dan, LI Bin, SHEN Xingzhi. Spatiotemporal Evolution Characteristics of Forest Net Primary Productivity in Greater Khingan Mountains of Inner Mongolia and Its Response to Climate Factors[J]. Chinese Agricultural Science Bulletin, 2026, 42(13): 152-160.

Figures/Tables 8

References 27

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