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[Objective] As an innovative way of regulating territorial space, the planning of flexible space is of great significance for improving the scientific quality and effectiveness of spatial planning, and reducing the disturbance and impact of uncertain factors. This study aimed to explore the delineation of land use layout flexible space under uncertain conditions. [Methods] The study took Xuzhou City, a typical resource-based city, as an example. First, an interval optimization model was used to obtain the flexible quantity interval of various land use types. Then, the upper and lower limits of the interval served as the quantity demand to import the PLUS model to simulate the spatial layout of various land use types, and the difference between the two simulated layouts was designated as flexible space. [Results] The results show that: (1) There are differences in the size of the flexible quantity interval of each land use type, among which land use types that contribute more to addressing future uncertainty are rural residential land, farmland, water, urban industrial and mining land, while the smaller ones are grassland and bare land. (2) The flexible space distribution of various land use types shows a certain pattern, and the flexible space of farmland is concentrated in the hotspots of land use change around urban and rural areas, the flexible space of garden plot and woodland is distributed in suitable growth areas such as river banks and low hills, and the flexible space of urban industrial and mining land and rural residential land is mainly distributed in the outer edge areas of their original scope. (3) Based on the flexible space of each land use type, the land types were merged according to the zoning function of the planning, and the conflicting parts of the flexible space were processed according to the suitability to obtain the flexible space of different spatial planning zones. Among them, the flexible space areas of agricultural production zones, ecological protection zones, urban construction zones, and rural development zones account for 1.74%, 0.20%, 1.09%, and 3.31% of the total area, respectively. [Conclusion] The probability distribution of possible conflicts in land use space is the prerequisite for the delineation of flexible space. It is necessary to delineate flexible space of land use layout from an uncertain perspective. Based on interval optimization and PLUS model, the delineation method of flexible space proposed in this study seems feasible, which can provide support for planning decisions.

Copyright of Bulletin of Soil & Water Conservation is the property of Bulletin of Soil & Water Conservation Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of China Tropical Medicine is the property of China Tropical Medicine Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Remote Sensing for Natural Resources is the property of Remote Sensing for Natural Resources Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Chinese Journal of Applied Ecology / Yingyong Shengtai Xuebao is the property of Chinese Journal of Applied Ecology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The changes of urban surface landscape will lead to damage, fragmentation, and losses of biodiversity, resulting in urban biodiversity decline. In order to explore the responses of urban plant diversity to the changes of landscape pattern, we chose the urban area surrounded by round-city highway as research object, set 36 plots in different directions with the Gupeng Square as the center, investigated the plant group in each of the plots through coverage rank method of Braun-Blanquet, and examined the features of plant species diversity in Xuzhou's greenlands. Meanwhile, we divided the landscape of the research area into seven categories: buildings, grasslands, forest lands, waste lands, water areas, roads and farmlands with the help of Erdas, GIS software and Landsat TM remote sensing images from 2005 to 2015 as basic data source. The features of landscape pattern in the research area were analyzed by Fragstats software. We set nine different buffer districts within each of the sample plot by applying the space analyzing function of GIS, calculated 39 landscape pattern metrics using Fragstats, and explored the features of how plant diversity responsed to landscape pattern. After that, the landscape pattern metrics with significant influence on the plant diversity of urban greenlands under different extents were selected by redundant analysis (RDA). The results showed that the plant diversity had obvious temporal and spatial scale effects in responses to landscape pattern and landscape elements. In 2005, the patch area and shape metrics of unused land and farmland could better explain plant diversity in 800 m buffer zone. The patch fragmentation and connectivity metrics of construction land had significant impacts on plant diversity within the extent of 800-2000 m. In 2015, grassland and forest landscapes better explained plant diversity in the 800 m buffer zone while construction sites and unused land had a remarkable impact on plant diversity in the extent of 1000-2000 m. The current plant diversity was more strongly influenced by the 2005 landscape type metrics, indicating that the plant diversity lagged in its response to the changes of landscape pattern. The pattern metrics of landscape level were more consistent with the landscape-class level metrics, indicating that the interaction between species and spatial scale was more dependent on the landscape type. This study would provide effective decision-making information for Xuzhou City planning and construction as well as effective protection of urban green space biodiversity.

Objective: To investigate the status of knowledge, attitude and practice (KAP) of foodborne parasitic diseases among middle school students in Xuzhou City, so as to provide a reference to the health education., Methods: A total of four middle schools were selected and their students were investigated with the basic information questionnaire and questions of foodborne parasitic diseases., Results: The awareness rates of parasitic diseases, hazards and transmission were 56.50%, 66.33% and 70.50% respectively. The awareness rates of transmission of the diseases in the senior high school students and urban students were higher than those in the junior middle school students and rural students ( χ 2 = 8.684, 8.470, both P < 0.05). The formation rates of not drinking raw water and not eating raw food were higher among the female students than those among the male students ( χ 2 = 7.675, 15.230, both P < 0.05). The formation rate of not eating raw food was higher among the senior high school students than that among the junior middle school students ( χ 2 = 49.276, P < 0.001), and the formation rates of washing hands before meals and not keeping pets were higher among the urban students than those among the rural students ( χ 2 = 5.833, 13.443, both P < 0.05). Totally 64.83% of the students would not eat food that might be infected with foodborne parasites, and the proportion of girls was higher than that of the boys ( χ 2 = 11.690, P < 0.05), and 20.5% of the students would suggest others not eating food that might be infected with foodborne parasites, and 81% of the students would plan to get rid of bad habits., Conclusions: The cognition of foodborne parasitic diseases is poor among the middle school students in Xuzhou City. The health education work on foodborne parasitic diseases should be strengthened.