Effects of land use patterns on the interannual variations of carbon sinks of terrestrial ecosystems in China

作者：Jiaxiang Liu, Zheng Wang, Yafeng Duan, Xinrui Li, Mingyang Zhang, Huiyu Liu, Peng Xue, Haibo Gong, Xing Wang, Yu Chen, Yinuo Geng · 发表于：Ecological Indicators · 年份：2023 · DOI：10.1016/j.ecolind.2023.109914 · 被引用次数：42 · 研究领域：Land Use and Ecosystem Services、Atmospheric and Environmental Gas Dynamics、Climate variability and models

Land use changes are thought to deeply impact the changes of terrestrial carbon sink, however, how the changes of land use pattern affect the carbon sink remains unclear. To investigate the response of Net Ecosystem Productivity (NEP) to the pattern of land use dynamics in China, a landscape pattern approach (with the 30 km moving window) was used to analyze the pattern dynamics with continuous Land Use and Land Cover Change (LUCC) data from 1981 to 2019 and the nonlinear trends of the NEP and the patterns of land use were explored from 1981 to 2019 using Ensemble empirical modal decomposition (EEMD) methods, and their interannual relationship was further explored using Pearson correlation. The results are as follows: (1) For NEP, nearly half of the regions did not experience significant changes. <6 % of the regions were monotonically decreasing and increasing to decreasing. The monotonical increasing only accounted for 15.49 % of the study area, while the trend shift from decreasing to increasing accounted for 23.96 %, most predominantly located in the southern part of the Southern Region (SR); (2) For land use patterns, the vast majority of areas (>90 %) have experienced significant changes in land use patterns, the fragmentation and shape complexity, diversity and evenness of land use types has increased, while the connection decreased, meanwhile, most of these changes are not monotonical, but experiencing trend shifts; (3) In most of the total area (>80 %), land use patte...