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Updated: May 31, 2026

Development of an Individual-Tree Basal Area Increment Model using a Linear Mixed-Effects Approach
Published on: July 3, 2020
[Spatial zoning of forest in Zixi County, Jiangxi Province based on carbon sink enhancement targets]
Yu-Qian Yan1,2, Hao-Tian Zhang1,3, Mei-Qing Zhu4
11 College of Land Resources and Environment, Jiangxi Agricultural University, Nanchang 330045, China.
Abstract:
Forests are the largest carbon sink in terrestrial ecosystem. Territorial spatial planning is an important carrier for the management of carbon sinks in forest vegetation. Exploring the spatial zoning of forest based on the goal of carbon sink increase is of great practical significance for achieving China's carbon neutrality goal. With Zixi County from Jiangxi Province as an example, based on the volume-biomass equation and the improved Carnegie-Ames-Stanford Approach (CASA) model, we analyzed the spatio-temporal variations of vegetation carbon storage and net primary productivity (NPP) of different forest types from 2009 to 2020. Combined with forest age and the results of the "three spatial control lines" demarcation in the national spatial planning, we conducted a multi-attribute comprehensive evaluation and spatial zoning at the township scale. The results showed that the overall land-use structure of the county remained relatively stable from 2009 to 2020, while structural changes in forestland had a significant impact on vegetation carbon storage. Broad-leaved forests were the dominant contributors to vegetation carbon storage, accounting for 78.8% and 80.4% of the total in 2009 and 2020, respectively. By 2020, vegetation carbon storage of forest in Zixi County had increased by 13.4% compared with 2009. With increasing forest age, vegetation carbon storage in most forestlands exhibited an inverted U-shaped pattern, reflecting the constraining effects of forest aging on carbon sink functions. From 2009 to 2020, forest vegetation NPP decreased by 7.3% overall, primarily due to anthropogenic disturbances and stand aging. Based on carbon sink characteristics and territorial spatial regulation constraints, we classified the 12 townships (including forest farms) in Zixi County into three functional zones: carbon sink growth zone, carbon sink conservation zone, and carbon sink renewal zone. Corresponding management strategies included prioritizing protection in growth zones, promoting rational utilization in conservation zones, and implementing orderly adjustment in renewal zones.
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