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我国正处于一个经济持续快速发展人地矛盾不断加剧的历史时期.为实现我国耕地保有量18亿亩的目标,大力开展土地整治将是当前和今后一个时期我国土地管理工作的一个重要内容. 相似文献
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我国正处于一个经济持续快速发展人地矛盾不断加剧的历史时期。为实现我国耕地保有量18亿亩的目标,大力开展土地整治将是当前和今后一个时期我国土地管理工作的一个重要内容。我国土地整理工作已开展近10年,有相当一部分项目进入到了实际运行阶段,研究实施效果评价的理论与方法,并在实践中加以应用,将关系到我国土地整理工作能否持续发展并达到预期效果。 相似文献
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土地管理在农村中最头痛的是农民建房用地问题。农民宅基地使用违法严重。如果不及时采取有效措施加以引导、规范,将会导致耕地更快地减少,最终将会损害农民的切身利益,破坏“十分珍惜、合理利用土地和切实保护耕地”的基本国策。 相似文献
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China is a disaster prone country, and a comprehensive understanding of change of disasters is very important for China’s agricultural development. In this study, statistical techniques and geographic information system tools are employed to quantify the main agriculture disasters changes and effects on grain production in China during the period of 1990–2011. The results show that China’s grain production was severely affected by disasters including drought, flood, hail, frost and typhoon. The annual area covered by these disasters reached up to 48.7×106 ha during the study period, which accounted for 44.8% of the total sown area, and about 55.1% of the per unit area grain yield change was caused by disasters. In addition, all of the disasters showed high variability, different changing trends, and spatial distribution. Drought, flood, and hail showed significantly decreasing trends, while frost and typhoon showed increasing trends. Drought and flood showed gradual changes and were distributed across the country, and disasters became more diversified from north to south. Drought was the dominated disaster type in northern China, while flood was the most important disaster type in the southern part. Hail was mainly observed in central and northern China, and frost was mainly distributed in southern China. Typhoon was greatly limited to the southeast coast. Furthermore, the resilience of grain production of each province was quite different, especially in several major grain producing areas, such as Shandong, Liaoning, Jilin and Jiangsu, where grain production was seriously affected by disasters. One reason for the difference of resilience of grain production was that grain production was marginalized in developed provinces when the economy underwent rapid development. For China’s agricultural development and grain security, we suggest that governments should place more emphasis on grain production, and invest more money in disaster prevention and mitigation, especially in the major grain producing provinces. 相似文献
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我国正处于一个经济持续快速发展人地矛盾不断加剧的历史时期。为实现我国耕地保有量18亿亩的目标，大力开展土地整治将是当前和今后一个时期我国土地管理工作的一个重要内容。我国土地整理工作已开展近10年，有相当一部分项目进入到了实际运行阶段，研究实施效果评价的理论与方法，并在实践中加以应用，将关系到我国土地整理工作能否持续发展并达到预期效果。 相似文献
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基于多智能体系统的城市增长时空动态模拟——以江苏省连云港市为例 总被引：3，自引：2，他引：1
城市化是土地利用/覆盖变化中最典型形式之一,探索城市增长的驱动机制并预测其未来变化,对于实现城市可持续发展十分重要。鉴于多智能体系统强大的模拟复杂空间系统的能力,基于联合"自上而下"和"自下而上"决策行为的视角,构建了一个城市增长时空动态模拟多智能体模型,在模型中,宏观Agent实施的"自上而下"的宏观土地利用规划行为和微观Agent自主发起的"自下而上"的微观土地利用空间诉求行为通过二维空间网格相互作用,并通过联合决策共同推动研究区域的城市化进程。以连云港市中心城区为例,考虑了基于目前趋势、经济发展优先和环境保护优先的3种目标情景,并进行了相应的城市增长情景模拟。模拟结果表明:联合"自上而下"和"自下而上"决策行为的城市增长时空动态模拟多智能体模型能够充分发挥多智能体系统的潜力来了解城市化的驱动机制,为城市管理提供基于情景分析的决策支持。 相似文献
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