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[学术文献 ] Cultivated land multifunctionality in undeveloped peri-urban agriculture areas in China: Implications for sustainable land management 进入全文
Journal of Environmental Management
The spatial planning and sustainable management of peri-urban cultivated land are key aspects of national development in many countries because of the continuing expansion of urban areas and deterioration of agro-ecosystem services. Detailed geo-informational investigation of cultivated land multifunctionality and the spatial interactions and dependencies of these multiple functions is required to inform the currently weak theoretical framework of multifunctionality at the peri-urban scale. Accordingly, the objective of this study was to construct a comprehensive methodology to identify and evaluate cultivated land multifunctionality in a spatial context. Geochemical data were used to measure cultivated land multifunctionality. We evaluated two main functions—the productive function and the ecological function—of an undeveloped peri-urban agriculture (PUA) area in the northern fringe of Changchun City in the black-soil region of northeastern China. For the ecological utilization of PUA areas, tradeoff and synergy analyses of cultivated land multifunctionality and coordinated development under complex land-use patterns were measured using a bivariate local Moran's I method. Results reveal considerable spatial heterogeneity in the two functions, with hotspots or coldspots being found in the PUA area. The productive function presents a less pronounced decreasing trend along the rural-to-urban gradient compared with the ecological function. Tradeoffs and synergies between the productive function and the ecological function occur mainly in the northern (more rural) part of the PUA area, where the spatial spillover effect of urbanization is relatively low. Cultivated land functions are strongly affected by urbanization-induced land-use types, and the coordinated areas of the productive function are generally consistent with those of the ecological function. According to these results, we delineate nine zones of multifunctionality in the studied PUA area. Given the importance of harmonizing cultivated land multifunctionality to manage limited land resources in a sustainable way, application of the GIS- and geochemistry-based multifunctionality evaluation scheme proposed in this study should be used to guide peri-urban spatial planning and land-use management and inform the policy arena concerning the transition of land use in urban peripheries.
[学术文献 ] 1990–2021年蒙古高原年度丰水期水体数据集 进入全文
中国科学数据(中英文网络版)
蒙古高原生态系统脆弱，土地荒漠化严重，是亚洲地区主要的气候敏感区域之一，其水资源的时空变化有重要的研究价值。本数据集利用Google Earth Engine(GEE)平台，对近32年（1990–2021年）可用的高质量Landsat系列卫星影像进行处理。利用最小云量合成算法，得到每年的丰水期（6–9月）最小云量影像。计算NDWI后采用大津算法进行阈值分割，提取得到32年蒙古高原逐年丰水期30 m分辨率水体数据，最终结果以Geo TIFF格式保存。通过对比，数据集与JRC年度水体数据的永久水体和最大水体的一致性平均值分别为93.0%和90.9%，具有较高的可信度。数据集可以为蒙古高原水资源变化、生态建设规划、环境保护等提供数据支撑。
[学术文献 ] The effect of animal husbandry on economic growth: Evidence from 13 provinces of North China 进入全文
Frontiers in Environmental Science
Promoting animal husbandry industry is important to help strengthen the agricultural sector. This study starts from both socio-economic and natural factors perspectives. Based on an exploratory spatial analysis, spatial econometric model, and geographically weighted regression (GWR) model, selecting the 13 Provinces of North China as the study area, this study analyzes the spatio-temporal differences and the driving factors. This study found: 1) Between 2006 and 2017, the spatial and temporal differences of GDP in the 13 provinces were statistically significant, with increased total production values and a slowed growth of the industry. In addition, the study area showed an east-west dichotomy in husbandry industry. 2) GDP had shown obvious spatial agglomeration, of which areas with the high production value were in east of Beijing, and areas with low production value were in western Inner Mongolia, Xinjiang and Gansu. 3) Population, animal husbandry output values, numbers of large livestock, and cultivated areas had greatly influenced the GDP of 13 provinces in north China. 4) The three influencing factors on GDP in the 13 provinces were found to be population, animal husbandry output values, and the sizes of cultivated areas. We should synthesize these influencing factors, supplemented with public policy concessions and compensatory measures to develop policies for improving the level of local economic development. Based on this, this study aims to provide a reference for decision making to promote the coordinated development of livestock husbandry and economic growth in China, and even provide a scientific reference for the management of similar pastoral areas in the world.
[学术文献 ] Assessing complementary synergies for integrated crop–livestock systems under conservation agriculture in Tunisian dryland farming systems 进入全文
Frontiers in Sustainable Food Systems
The aim of this paper is twofold. The first objective is to measure the technical efficiency of mixed crop-livestock (CL) smallholder producers operating under conservation agriculture systems in Tunisian rainfed areas. The second objective is to explore complementarities, synergies, and economies of diversification across the different production system components of these crop-livestock producers using the cross-partial derivative framework of output variables in the distance function. A simple random sampling process was employed to select and survey 59 CL smallholders operating under conservation agriculture. The collected data were analyzed using a stochastic input distance function in which synergies were estimated based on the second cross-partial derivative concept of output variables in the distance function. Results show that technical inefficiencies are significant in integrated crop-livestock systems, and there is evidence that economic diversification provides a productivity buffer against climate change threats. As a sustainable intensification strategy, this integrated system also offers a potential advantage. The results further contribute to the debate on crop diversification vs. specialization. Although an enhanced system integration could be a financially and ecologically viable option for mixed crop-livestock systems, more pathways for profitable and viable diversification of cereal-based or orchard-based systems remain to be explored.
[学术文献 ] 自然灾害综合风险防范信息服务技术体系构建及展望 进入全文
地球信息科学学报
构建自然灾害综合风险防范信息服务业务技术体系是支撑新时代防灾减灾救灾工作的必然要求.文章聚焦全链条、多主体、多灾种综合风险防范信息服务需求,建立了自然灾害综合风险防范信息服务的技术体系框架,构建了涵盖常态减灾和灾前预防、灾中救援、灾后恢复重建等非常态救灾全过程的综合风险防范信息服务产品体系,建立了信息产品开发、行业数据协同、网络大数据挖掘、信息服务平台集成等方面的关键技术.其中,信息产品体系构建从灾害管理过程、主要业务类型和工作任务方面进行三级分类.信息产品开发方面研发了基于致灾、灾情、救灾3类标准灾害信息要素的灾害信息产品制作、表达和动态定制技术;行业数据协同方面研发了双向自适应的部门微服务数据共享新机制及多部门多源异构数据接入、融合处理技术;网络大数据挖掘领域研发了基于网页、移动通信、社交网络、物联网等网络大数据的致灾、灾情、救灾要素信息挖掘与融合分析技术;信息服务集成平台搭建领域研发了基于云服务架构的时空分布式大数据管理、业务工具模型集成、"云+端"多渠道信息服务技术.该技术体系解决灾害信息服务时效性不高、完备性不足等问题,为开辟与政府部门统计并行的灾害信息数据获取新途径提供了技术支撑。
[学术文献 ] 黑龙江省耕地非农化的空间格局演变特征研究 进入全文
湖南师范大学自然科学学报
以我国粮食主产区黑龙江省为研究区，确定耕地非农化的时空分异特征，从耕地非农化水平空间和垂直空间两个方面确定耕地非农化的空间演变特征。以黑龙江省1980年、1990年、1995年、2000年、2005年、2010年、2015年和2020年8期土地利用数据为基础，提取耕地非农化信息，综合利用GIS空间分析、标准差椭圆分析、热点分析、DEM高程分级确定耕地非农化的空间演变特征。黑龙江省1980—2020年间，耕地非农化用地数量呈波动增加趋势，各时期耕地非农化的空间聚集位置具有明显空间特征，集中分布地区总体轮廓呈西—东分布格局；耕地非农化以西南部为热点区域，东部为冷点区域，2010—2015年形成了以“哈—大—齐”为主要热点区域的空间分布格局；在垂直空间上，黑龙江省耕地非农化随着高程、坡度的增加而减少。耕地非农化过程受自然、经济因素的影响发生变化，2010—2020年为黑龙江省耕地非农化过程的重要时期。研究成果对合理利用和保护耕地资源具有重要意义，为保障国家粮食安全起到积极作用，在一定程度上可以为耕地保护和优化耕地布局提供决策参考。
