Net primary productivity simulation and environmental response analysis of the Jianghe River basin in western Hubei Province based on the BEPS-TerrainLabV2.0 model

doi:10.6046/zrzyyg.2022340

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Abstract

The simulation-based estimation and spatio-temporal variations of the net primary productivity (NPP) of regional vegetation hold critical significance for analyzing regional vegetation quality and carbon balance. This study investigated the Jianghe River basin in western Hubei Province. First, it pre-processed the input data, including land cover, topography, soil, meteorology, and vegetation indices. Based on this, it estimated the NPP of vegetation in the Jianghe River basin from 1986 to 2017 using the BEPS-TerrainlabV2.0 model, with the model's simulation accuracy evaluated. Moreover, this study explored the spatio-temporal variations of the NPP and its response to environmental changes. The results are as follows: ① The NPP of vegetation in the Jianghe River basin exhibited a unimodal distribution, with higher values in summer and lower values in winter, on an intra-annual scale, and a fluctuating rising trend on an inter-annual scale; ② The spatial distribution of the NPP manifested higher values in the north and lower values in the south; ③ The NPP values of different land cover types followed the sequence below: broad-leaved forests > mixed forests > coniferous forests > farmland > urban areas. The NPP rose with an increase in elevation. The NPP values of different soil textures rank below: sandy soil > sandy loam > loamy sand > silty loam; ④ Radiation and temperature manifested the strongest impact on NPP on a daily basis, and the leaf area index (LAI) exhibited the most significant influence on NPP on an annual basis, both passing the 0.01 significance test.

Keywords BEPS-TerrainlabV2.0 model net primary productivity spatio-temporal variation environmental impact

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Q948

Issue Date: 21 December 2023

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	Peipei CHEN
	Lihua ZHANG
	Yue CUI
	Junhong CHEN

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Peipei CHEN,Lihua ZHANG,Yue CUI, et al. Net primary productivity simulation and environmental response analysis of the Jianghe River basin in western Hubei Province based on the BEPS-TerrainLabV2.0 model[J]. Remote Sensing for Natural Resources, 2023, 35(4): 273-281.

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https://www.gtzyyg.com/EN/10.6046/zrzyyg.2022340 OR https://www.gtzyyg.com/EN/Y2023/V35/I4/273

Fig.1 Geographical location of the Jianghe River basin

Fig.2 Comparison of simulated NPP data in the Jianghe River basin and measured NPP data in Dajiuhu

Fig.3 MOD17A3 data spatial distribution

Tab.1 Comparison of BEPS-Terrain labV2.0 model simulated land cover type NPP data with other simulated or measured values

Fig.4 Multi-year average change of NPP in the Jiang River Basin

Fig.5 The NPP of the Jiang River changes over the years

Fig.6 NPP mutation analysis results

Fig.7 Spatial analysis of multi-year annual total NPP in the Jianghe River basin

Fig.8 Distribution of NPP for different environmental factors

Tab.2 Summary of daily-scale NPP linear regression equations

Tab.3 Summary of annual-scale NPP linear regression equations

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