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[Objective]The aims of this study are to explore the characteristics of cultivated land production, life and ecological function utilization, and propose the optimization schemes which are conducive to promoting the multifunctional utilization and coordinated development of cultivated land resources, and promoting the implementation of national cultivated land utilization and protection strategies. [Methods]After clarifying the internal logic of multifunctional utilization of cultivated land, the comprehensive evaluation and spatial pattern of multi-functional cultivated land in 59 districts and counties in the Guangxi section of the Pearl River-Xijiang River Economic Belt were discussed. Finally, based on the trade-off/synergistic correlation between the two functions, the triangular coordinate diagram was used to layout the functional types of cultivated land. [Results] (1)From 2000 to 2020, the functional indexes of cultivated land in Guangxi section of the economic belt showed a U-shape with time, and the production function decreased from 0. 168 to 0. 130. The overall change rate deceased in the order: ecological function (22. 62％)＞living function (16. 94％)＞ecological function (15. 83％). (2)In the past 20 years, the production, living and ecological functions of cultivated land generally had shown the distribution characteristics of high level in the east and low level in the west, with the proportion of high value areas of production function decreasing to 18. 64％, and the proportion of high value areas of living function and ecological function increasing to 27. 06％and 28. 24％, respectively. (3)Based on the trade-off/synergy relationship between functions, the multifunctional utilization of cultivated land in the study area was divided into four types by using the triangular coordinate diagram method. Among them, the coordinated development area of production-living-ecological function accounted for the largest number of districts and counties, and the multifunctional utilization of cultivated land in the study area performed well as a whole. [Conclusion]The differentiated optimization strategy based on functional evaluation and zoning is conducive to promoting the sustainable utilization and management of regional cultivated land resources, ensuring food security and promoting the development of agricultural modernization. [ABSTRACT FROM AUTHOR]

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[Objective] The aims of this study are to evaluate the quality and degradation of habitats in the land border zone of Guangxi, and explore their evolutionary characteristics and aggregation effects, so as to provide reference for the construction of regional ecological civilization, the protection of the ecological environment and biodiversity, and the realization of green development. [Methods] Based on the InVest model and Moran′s I index, the habitat quality and degree of habitat degradation in the border areas of Guangxi was explored, and their spatiotemporal evolution and aggregation degree were analyzed. [Results] (1) From 2000 to 2020, the areas with a low degree of habitat quality degradation in the border areas of Guangxi mainly distributed in areas with good natural environmental conditions such as forests and grasslands, while significant habitat degradation occurred in human activity areas such as cultivated land, construction land, and river water. (2) Overall, the habitat quality score in the border areas of Guangxi was relatively high, with average habitat quality values of 0.739 2, 0.739 5 and 0.734 2 in 2000, 2010 and 2020, respectively. There were some counties and cities that occupied farmland in urban construction, resulting in a decrease in habitat quality. (3) The habitat quality in the border areas of Guangxi had significant clustering in spatial distribution. Although the area of high-high type clustering areas was significantly larger than that of low-low type clustering areas, there were low-low type clustering areas that cut the high-high type clustering areas, resulting in a decrease in the degree of concentration and fragmentation of higher habitats. [Conclusion] Land use changes in the border areas of Guangxi have a profound impact on the quality of regional habitats. In the future, we should strengthen bottom-line constraints and guide human activities. [ABSTRACT FROM AUTHOR]

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 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 Journal of Ecology & Rural Environment is the property of Journal of Ecology & Rural Environment 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.)

Changes in land use have posed a great challenge to the development and protection of national land space in the border areas. Taking the China-Vietnam border areas in the Guangxi Zhuang Autonomous Region as the research object, an evaluation index system was constructed in this study to deduce the multifunctional system of land utilization using “elements-structure-space-function” of the production-living-ecosystem space (PLE). The dynamic index and transition matrix model were applied to analyze the PLE evolution of the spatial pattern from 2000 to 2018. TOPSIS method and the obstacle model were adopted to measure the multifunctional level, further to diagnose the main obstacle factors. The results showed that: 1) The evolution speed of PLE spatial pattern changed from mild to accelerated fluctuation, indicating an obvious periodic characteristic . Specifically, a slow evolution period was from 2000 to 2010, while an accelerated period was from 2010 to 2018. The spatial comprehensive dynamic index of PLE increased from 0.07 to 0.20, where the mutual transfer area between spaces of the PLE was totaled 85218.32hm2 . The production space and living space increased by 1145.97hm2, and 3166.77hm2, respectively. The area of ecosystem space decreased by 4312.69hm2 . There was a much more violent evolution of land use pattern at all county-level, including Pingxiang City, Dongxing City and Fangcheng District, indicating relatively high urbanization and frequent border trade in the middle-southeast area. 2) Functional level for the land use of the PLE improved relatively fast. Specifically, the functional level of life was the highest with the comprehensive appraisal index of 0.86, increasing by 0.71 in 2000. The functional level of the production was listed as the second, with the comprehensive appraisal index increased by 0.25, an increasing rate of 69.99%. The functional level of the ecosystem was the lowest, with the comprehensive appraisal index increased by 0.13, an increasing rate of only 28.22%. There was obvious fluctuation for the functional level of the production and ecosystem. The multifunctional level of land utilization increased from 0.32 to 0.68. The multifunction of the land utilization in counties and cities changed from the low level and large gap to relatively balanced, representing “two cores and two subs” pattern. There were the same characteristics in the pattern evolution of the land utilization and multifunctional change. 3) The main obstacle factors included resource elements layout, economic development level, ecological environment quality, and border trade. In the function of life, the main obstacle factors were the low richness of tourism resources and low average tourism income in different areas. In the function of production, the main obstacle factors were the low investment in urban fixed assets and low average foreign trade in different areas. In the function of ecosystem, the main obstacle factors were the decreased forest coverage and insufficient capacity for sewage treatment. A recommendation was made to optimize the tourism resources layout, regional economic integration, and the construction of ecological civilization for a better multifunctional effect on the land utilization of the PLE in the China-Vietnam border areas. [ABSTRACT FROM AUTHOR]