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Impacts of multi-scenario land use change on ecosystem services and ecological security pattern: A case study of the Yellow River Delta

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Research in Cold and Arid Regions 2024年第1期16卷 30-44页

作者： xuehua cen Hua Zhang College of Geography and Environmental Science Northwest Normal UniversityLanzhouGansu 730070China

The Yellow River Delta(YRD), a critical economic zone along China's eastern coast, also functions as a vital ecological reserve in the lower Yellow River. Amidst rapid industrialization and urbanization, the region has witnessed significant land use/cover changes(LUCC), impacting ecosystem services(ES) and ecological security patterns(ESP). Investigating LUCC's effects on ES and ESP in the YRD is crucial for ecological security and sustainable development. This study utilized the PLUS model to simulate 2030 land use scenarios, including natural development(NDS), economic development(EDS), and ecological protection scenarios(EPS). Subsequently, the InVEST model and circuit theory were applied to assess ES and ESP under varying LUCC scenarios from 2010 to 2030. Findings indicate:(1) Notable LUCC from 2010 to 2030, marked by decreasing cropland and increasing construction land and water bodies.(2) From 2010 to 2020, improvements were observed in carbon storage,water yield, soil retention, and habitat quality, whereas 2020–2030 saw increases in water yield and soil retention but declines in habitat quality and carbon storage. Among the scenarios, EPS showed superior performance in all four ES.(3) Between 2010 and 2030, ecological sources, corridors, and pinchpoints expanded, displaying significant spatial heterogeneity. The EPS scenario yielded the most substantial increases in ecological sources,corridors, and pinchpoints, totaling 582.89 km^(2), 645.03 km^(2),and 64.43 km^(2), respectively. This study highlights the importance of EPS, offering insightful scientific guidance for the YRD's sustainable development.

关键词： Land use change Multi-scenario simulation Ecosystem services Ecological security pattern The Yellow River Delta Circuit theory

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Holocene Climate Cycles in Northwest Margin of Asian Monsoon

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Chinese Geographical Science 2012年第4期22卷 450-461页

作者： LI Yu WANG Nai'ang LI Zhuolun ZHOU xuehua ZHANG Chengqi College of Earth and Environmental Sciences Center for Hydrologic Cycle and Water Resources in Arid RegionLanzhou UniversityLanzhou 730000China

In the mid-latitude regions of the Asian continent, Zhuye Lake is located in the northwest margin of the Asian monsoon, where the modem climate is affected by the Asian monsoon and Westerlies. In this study, we investi- gated the absolutely dated Holocene records in Zhuye Lake for detecting the Holocene climate cycles. Totally, 14 14C dates and 6 optically simulated luminescence （OSL） dates are obtained from the QTH01 and QTH02 sections. The proxies of grain-size, total organic carbon content （TOC）, C/N and 813C are used for wavelet analysis, and the results show obvious -256, -512 and -1024-year climate cycles, which are consistent with the Holocene millennial and cen- tennial scale climate cycles in the typical Asian summer monsoon domain. In different parts of the Zhuye Lake, the Holocene sediments show variable climate cycles that are affected by the lake basin topography. In the Zhuye Lake, the Holocene climate cycles are mainly correlated with the solar-related Asian summer monsoon variability and the North Atlantic ice-rafting events.

关键词： Holocene climate cycle Asian monsoon wavelet analysis Zhuye Lake

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儿童CRKP感染的临床特征及预后不良危险因素研究

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重庆医学 2024年第2期53卷 198-203页

作者：付春云张欢刘敏雪岑贞娇阮佳玲王双杰胡雪桦广西壮族自治区妇幼保健院医学检验科南宁530003

目的分析儿童耐碳青霉烯类肺炎克雷伯菌(CRKP)感染的临床特征、耐药性及预后不良危险因素。方法收集2016年8月5日至2020年12月31日该院分离的住院患儿分离CRKP标本,对CRKP阳性患儿临床资料和CRKP耐药性进行分析,对CRKP感染患儿预后良好... 详细信息

目的分析儿童耐碳青霉烯类肺炎克雷伯菌(CRKP)感染的临床特征、耐药性及预后不良危险因素。方法收集2016年8月5日至2020年12月31日该院分离的住院患儿分离CRKP标本,对CRKP阳性患儿临床资料和CRKP耐药性进行分析,对CRKP感染患儿预后良好组和预后不良组的相关资料进行比较,并分析预后不良的危险因素。结果共收集106株非重复CRKP,主要分离自≤1岁患儿。科室分布以新生儿重症医学科和重症医学科为主。CRKP对多种抗菌药物呈高耐药,仅对阿米卡星、左氧氟沙星、庆大霉素、环丙沙星、米诺环素、氯霉素的耐药率<30%。CRKP感染患儿预后不良率达27.4%。logistic多因素回归分析结果显示,多器官功能障碍和贫血是CRKP感染患儿预后不良的独立危险因素(P<0.05)。结论儿童CRKP感染以≤1岁婴儿为主,CRKP对多种抗菌药物呈高度耐药,预后不良的独立危险因素包括多器官功能障碍和贫血。

关键词：耐碳青霉烯类肺炎克雷伯菌耐药性危险因素多器官功能障碍贫血

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