Subjects: Geosciences >> Geography submitted time 2023-04-07 Cooperative journals: 《干旱区地理》
Abstract： Habitat quality is an important basis for human well-being and regional sustainable development and has important practical significance for protecting regional biodiversity, improving regional ecosystem services, and building regional ecological security patterns. Based on the three-phase land use raster data from 2000, 2010, and 2020, this study comprehensively applied the InVEST model, topographic position index, distribution index, geographic detector, and spatial statistical analysis methods to analyze the spatiotemporal evolution characteristics and spatial distribution of habitat quality in the Weihe River Basin in China. The pattern and its topographic gradient effects and influencing factors were comprehensively analyzed. The results are as follows: (1) From 2000 to 2020, the habitat quality index of the Weihe River Basin exhibited a yearly increasing trend. The habitat quality index increased from 0.607 to 0.624, and the growth rate was 2.463%. It showed a polarized distribution pattern in space. The area of low habitat quality and high habitat quality continued to increase, whereas the area of medium and good habitat quality decreased. (2) The spatial distribution pattern of habitat quality in the Weihe River Basin was significantly affected by topographic factors, with a significant topographic gradient effect. It is extensively distributed on the topographic gradient, and its distribution index is the highest, whereas high habitat quality occupies a dominant position on the high topographic gradient. (3) From the perspective of different influencing factors, the land use type is the main reason for the spatial differentiation pattern of habitat quality in the Weihe River Basin. Influencing factors and the interaction of any two factors on the spatial differentiation of habitat quality have a greater impact than the independent effect of a single driving factor. Among them, the interactive determinants of land use type and natural factors such as rainfall, temperature, altitude, and normalized vegetation index are >0.6. The research results can provide scientific theoretical and decision support for the sustainable development of the Weihe River Basin, as well as ecological protection and high-quality development.
Subjects: Geosciences >> Geography submitted time 2022-10-21 Cooperative journals: 《干旱区地理》
Abstract：深入探究半干旱区景观格局变化规律，明确其生态风险时空演变特征与影响因素，对优化 半干旱区景观格局、防范和治理生态风险、促进区域可持续高质量发展具有重要意义。以宁夏回 族自治区盐池县为例，基于20002020年土地利用数据，通过景观格局指数构建生态风险模型，结 合地统计分析和地理探测器模型，对其景观格局变化及生态风险时空演变与影响因素进行综合研 究。结果表明：（1）20002020年盐池县耕地和未利用地面积下降，其余地类均呈增加趋势，其中 建设用地扩张速度最快，年均增长率为6.90%。（2）20002020年盐池县景观斑块数、斑块密度、景 观形状指数和香浓多样性指数上升，最大斑块指数和蔓延度指数下降，表明景观格局呈破碎化、复 杂化和分散化的发展态势。（3）20002020年盐池县生态风险指数由0.1465下降至0.1312，其中 高、较高和中等风险区面积占比分别下降5.25%、24.21%和5.44%，而低和较低风险区面积占比分 别增加14.11%和20.79%，空间上呈现出北高南低的分布格局。（4）随着社会需求的日益增长和人 类活动的加剧，自然因素对生态风险空间分异格局的影响逐渐弱化，而社会经济因素作用不断 增强。
Subjects: Geosciences >> Geography submitted time 2021-08-02 Cooperative journals: 《干旱区地理》
Abstract： 生态脆弱性是当前全球环境变化与区域可持续发展研究的重点，也是生态文明建设和绿色 发展研究的热点。以中国北方农牧交错区盐池县为例，基于 2000—2017 年 3 期遥感数据，运用景观格局指数法、空间自相关以及地理探测器等模型对研究区生态脆弱性时空演变格局及其驱动因 素进行综合评价。结果显示：（1）研究区草地分布广泛，且面积逐年增加，耕地和未利用地面积分 别 减 少 44673.7 hm2 和 73033.1 hm2，林 地 、水 域 和 建 设 用 地 面 积 增 加 迅 速 ，年 均 变 化 率 分 别 为 2.86%、2.15%和 4.80%；（2）景观斑块数量减少，破碎度趋于缓和，不同类型景观彼此之间具有良好的连接性，景观格局趋向规则、连续的整体演变；研究区景观生态脆弱性逐年下降，高脆弱分布区主要分布在北部的高沙窝镇、花马池镇以及西部的惠安堡镇，低脆弱区主要分布在东南部的麻黄 山镇、大水坑镇以及青山乡等地区，且低脆弱区范围由东南向西北延伸；空间自相关 Moran’s I 大于 0.52，表明存在正相关，空间具有显著的集聚性和异质性，且呈现出“东南低，西北高”的分布格局；地理探测器结果显示景观斑块数、破碎度、优势度以及香浓多样性指数是影响研究区生态脆弱性空间异质性的主要因素。
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