Transformation of agricultural landscapes under rapid urbanization: A threat to sustainability in Hang-Jia-Hu region, China
Transformation of agricultural landscapes under rapid urbanization: A threat to sustainability in Hang-Jia-Hu region, China
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DOI：
10.1016/j.apgeog.2010.10.008
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发表时间：
2011-04-01
影响因子：
4.9
通讯作者：
Zhang, Yuan
中科院分区：
文献类型：
--
作者：
Su, Shiliang;Jiang, Zhenlan;Zhang, Yuan
利用一系列与可持续发展密切相关的度量方法，分析了杭嘉湖地区(中国)1994年至2003年农业景观的时空动态。市区有相当大的扩展，总建筑面积由6.99x10(4)公顷增至22.7x10(4)公顷，增幅达224.7%。结果表明，在整个区域尺度上，随着城市化程度的加深，农业景观逐渐丧失、碎片化、转化和孤立。利用全球Moran‘s I统计量和局部空间关联指标(LISA)分析了两个栅格尺度上农业景观变化的空间相关性和热点。总体而言，农业斑块隔离是一个局部性问题，而农业景观形态变化是一个更区域化的问题；农业景观丢失、破碎化和不规律性的热点集中在城市中心，而农业斑块隔离的热点出现在农村山区。空间回归模型进一步表明，农业景观变化与各个景观指标的城市化指标呈现出不同的关系。每种景观度量的关系特征和强度都不同，并随尺度而变化。虽然我们对农业景观变化的结果与文献中的一些理论预测相一致，但它们也显示出不同的城市化时空特征。解决这些差异肯定会有助于正在进行的景观转型和可持续性辩论。这项研究显示了城市化与农业景观变化之间关系的复杂性，并强调了在量化这些关系时，选定的变量、空间和时间尺度以及空间维度的纳入的重要性。(C)2010爱思唯尔有限公司。保留所有权利。
This paper analyzed the spatiotemporal dynamics of agricultural landscapes within Hang-Jia-Hu region (China) from 1994 to 2003 using a set of metrics that relate closely with sustainability. Considerable urban expansion was identified with the total built-ups increasing by 224.7% from 6.99 x 10(4) ha to 22.7 x 10(4) ha. The outcomes indicated that, at the whole region scale, agricultural landscapes became lost, fragmented, transformed and isolated as urbanization intensified. Global Moran's I statistics and Local Indicators of Spatial Association (LISA) analysis were employed to characterize the spatial dependence and hotspots for intra-level agricultural landscape changes at two grid scales. Generally, isolation of agricultural patches was a localized problem, while shape transformation of agricultural landscapes was a more regionalized problem; hotspots for lost, fragmentation and irregularity of agricultural landscapes concentrated around urban centers, while those for isolation of agricultural patches appeared in rural mountain areas. Spatial regression models further revealed that changes of agricultural landscapes showed diverging relationships with urbanization indicators for each landscape metric. The character and strength of relationships for each landscape metric were different and changed with scale. While our results of agricultural landscape changes consisted with some theoretical predictions in the literature, they also showed different spatiotemporal signatures of urbanization. Resolving these differences will certainly contribute to the ongoing landscape transformation and sustainability debate. This study demonstrated complexities of relationships between urbanization and agricultural landscape changes, and highlighted the importance of selected variables, spatial and temporal scales and incorporation of spatial dimensions when quantifying these relationships. (C) 2010 Elsevier Ltd. All rights reserved.