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| 1 | Dynamic Changes in the Wetland Landscape Pattern of the Yellow River Delta from 1976 to 2016 Based on Satellite Data显示文摘The Yellow River Delta wetland is the youngest wetland ecosystem in China's warm temperate zone. To better understand how its landscape pattern has changed over time and the underlying factors responsible, this study analyzed the dynamic changes of wetlands using five Landsat series of images, namely MSS(Mulri Spectral Scanner), TM(Thematic Mapper), and OLI(Operational Land Imager) sensors in 1976, 1986, 1996, 2006, and 2016. Object-oriented classification and the combination of spatial and spectral features and both the Normalized Difference Vegetation Index(NDVI) and Normalized Difference Water Index(NDWI), as well as brightness characteristic indices, were used to classify the images in eCognition software. Landscape pattern changes in the Yellow River Delta over the past 40 years were then delineated using transition matrix and landscape index methods. Results show that: 1) from1976 to 2016, the total area of wetlands in the study area decreased from 2594.76 to 2491.79 km^2, while that of natural wetlands decreased by 954.03 km^2 whereas human-made wetlands increased by 851.06 km^2. 2) The transformation of natural wetlands was extensive: 31.34% of those covered by Suaeda heteropteras were transformed into reservoirs and ponds, and 24.71% with Phragmites australis coverage were transformed into dry farmland. Some human-made wetlands were transformed into non-wetlands types: 1.55% of reservoirs and ponds became construction land, and likewise 21.27% were transformed into dry farmland. 3) From 1976 to 2016, as the intensity of human activities increased, the number of landscape types in the study area continuously increased. Patches were scattered and more fragmented. The whole landscape became more complex. In short, over the past 40 years, the wetlands of the Yellow River Delta have been degraded, with the area of natural wetlands substantially reduced. Human activities were the dominant forces driving these changes in the Yellow River Delta. | CONG Pifu CHEN Kexin QU Limei HAN Jianbo | 2019 | Chinese Geographical Science2019，29，3： | 12 |
| 2 | 欠发达生态敏感区空心村整治规划体系构建——以宁夏西吉县为例显示文摘'空心村'问题是指自20世纪90年代以来在我国快速城市化进程中,由于城市化滞后于非农化导致大量农村出现'人走屋空、外扩内空'的现象。现行空心村整治规划实践往往重建设规划而缺少系统的技术体系和内容体系支撑。以宁夏西吉县作为实证研究地区,结合其特殊的自然生态环境和社会经济条件,利用地理信息系统空间分析、多因素综合评价等方法开展空心村整治规划研究,构建起空心村整治'县—乡镇—村'3级规划体系。在体系构建中的县、乡镇、村庄3个层面分别以生态适宜性评价、村庄综合发展能力评价、村庄空心化程度和类型诊断为主要内容,形成空心村'整治片区划分—整治方向选择—整治模式选取'的技术路线和内容体系。 | 胡秀媚 冯健 | 2016 | 城市发展研究2016，23，12： | 8 |
| 3 | 农民工创业政策的变革与创新研究显示文摘农民工创业政策的出发点和研究中心,应该围绕农民工实际的利益,立足农民工创业的条件和现状,以提升农民工创业成功的比例为中心。从农民工立场考虑农民工的创业问题,依据农民工的综合能力,制定正确的方针政策,才是规范城乡市场引导农民工创业成功的重要选择。 | 吴阿群 | 2015 | 品牌2015，，4： | 0 |
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