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标题: How Does Different Cropland Expansion Trajectories Affect Cropland Fragmentation? Insights From Three Urban Agglomerations in Yangtze River Economic Belt, China

作者: Wang, LY (Wang, Liye); Zhang, SY (Zhang, Siyu); Xie, YF (Xie, Yifan); Liu, YF (Liu, Yanfang); Liu, YL (Liu, Yaolin)

来源出版物: FRONTIERS IN ECOLOGY AND EVOLUTION 卷: 10 文献号: 927238 DOI: 10.3389/fevo.2022.927238 出版年: JUN 30 2022

摘要: A clear understanding of cropland expansion dynamics and their effects is vital for cropland protection and food security. However, the trajectories of cropland expansion have been less discussed. This study referred to the modes of landscape expansion and assessed the cropland expansion trajectory in three urban agglomerations in the Yangtze River Economic Belt and its impact on cropland fragmentation. Specifically, we identified three cropland expansion trajectories using the landscape expansion index, namely, infilling, edge-expansion, and outlying. Moreover, the surface relief amplitude model was employed to characterize the relief amplitude effect on cropland expansion trajectories. By coupling landscape metrics (e.g., patch density, landscape shape index, the largest patch index, and aggregation index) and Spearman correlation analysis, the relationship between cropland expansion trajectories and cropland fragmentation was assessed. Results show that (1) three urban agglomerations experience cropland expansion, in which the edge-expansion trajectory is primary, followed by infilling and outlying trajectories; (2) the cumulative frequency curve indicates that infilling and edge-expansion trajectories are likely to be distributed in low topographic relief amplitude regions, while the outlying trajectory is located in relatively higher topographic relief amplitude regions; and (3) infilling and edge-expansion trajectories contribute to a significantly positive relationship with the decrease of cropland fragmentation, while the outlying trajectory has a negative relationship with cropland fragmentation. This research highlights that cropland protection policies should considerably focus on the trajectory of cropland expansion, not only request the total area of cropland in a dynamic balance.

作者关键词: cropland expansion trajectory; land fragmentation; landscape metrics; topographic relief amplitude; correlation analysis; landscape expansion index

地址: [Wang, Liye; Xie, Yifan; Liu, Yanfang; Liu, Yaolin] Wuhan Univ, Sch Resource & Environm Sci, Wuhan, Peoples R China.

[Zhang, Siyu] Huazhong Agr Univ, Coll Publ Adm, Wuhan, Peoples R China.

[Liu, Yaolin] Wuhan Univ, Collaborat Innovat Ctr Geospatial Informat Technol, Wuhan, Peoples R China.

通讯作者地址: Liu, YL (通讯作者)，Wuhan Univ, Sch Resource & Environm Sci, Wuhan, Peoples R China.

Liu, YL (通讯作者)，Wuhan Univ, Collaborat Innovat Ctr Geospatial Informat Technol, Wuhan, Peoples R China.

电子邮件地址: yaolin610@163.com

影响因子：4.493