Exploring the spatiotemporal variations and influential factors of net ecosystem productivity in the Inner Mongolian grassland ecosystem

doi:10.6046/zrzyyg.2024019

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Abstract

Net ecosystem productivity (NEP) serves as a significant index that quantitatively represents the carbon sequestration capacity of ecosystems. This study aims to explore the carbon source/sink status of the Inner Mongolian grassland ecosystem to support the efforts for low carbon and emission reduction. Based on MODIS NPP and meteorological data, and applying the trend analysis, coefficient of variation, Hurst index, and path analysis, this study explored the spatiotemporal variations of the NEP index in the Inner Mongolian grassland ecosystem from 2001 to 2020 and its relationship with influential factors. The results indicate that the overall spatial distribution pattern of average NEP in the Inner Mongolian grassland ecosystem was characterized by a gradual increase from northwest to southeast, and a gradual decrease from the Great Xing’an Range to the eastern and western foothills. The average annual NEP over the past 20 years was 210.65 gC·m^-2·a^-1, showing a fluctuating increase at a rate of 3.81 gC·m^-2·a^-1. The areas with increased NEP represented 99.33 % of the total grassland area, suggesting relatively stable changes in carbon sink. However, 69.08 % of NEP in the grassland system is expected to show weak anti-persistence in the near future, suggesting that carbon sink might be weakened. The selected influential factors, dominated by rainfall and minimum temperature, comprehensively explained 83.7 % of NEP variations. The results of this study assist in understanding the carbon sequestration characteristics of the Inner Mongolian grassland ecosystem while holding critical significance for achieving the carbon peak and neutrality goals.

Keywords Inner Mongolian grassland ecosystem net ecosystem productivity (NEP) index carbon source/sink spatiotemporal variations path analysis

ZTFLH:	TP79
	S812

Issue Date: 01 July 2025

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	Xia TANG
	Yongxin LIU
	Min MA
	Hongchao ZHEN

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Xia TANG,Yongxin LIU,Min MA, et al. Exploring the spatiotemporal variations and influential factors of net ecosystem productivity in the Inner Mongolian grassland ecosystem[J]. Remote Sensing for Natural Resources, 2025, 37(3): 212-220.

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https://www.gtzyyg.com/EN/10.6046/zrzyyg.2024019 OR https://www.gtzyyg.com/EN/Y2025/V37/I3/212

Fig.1 Topography and stable grassland distribution map of study area

Tab.1 Sources of data

Fig.2 Inter annual variation of mean NEP in Inner Mongolian grassland ecosystem

Fig.3 Spatial distribution of annual average NEP in grassland ecosystem of study area

Fig.4 Spatial distribution of NEP variation trend in grassland ecosystem of study area

Fig.5 Spatial distribution of NEP volatility in grassland ecosystem of study area

Fig.6 Future evolution trend prediction of NEP in grassland ecosystem of study area

Tab.2 Path analysis results of influencing factors of NEP in Inner Mongolian grassland ecosystem

Fig.7 Path analysis of NEP changes in Inner Mongolian grassland ecosystem

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[1]	ZHANG Zhenqi, CAI Huiwen, ZHANG Pingping, WANG Zelin, LI Tingting. A GEE-based study on the temporal and spatial variations in the carbon source/sink function of vegetation in the Three-River Headwaters region[J]. Remote Sensing for Natural Resources, 2023, 35(1): 231-242.

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