耕地

The results show that population change is the main cause for cultivated land reduction in Suzhou City since the reform and opening. In addition, changes of the urbanization rate and proportion of the tertiary-industry added value to regional GDP of the area also play an important role in the cultivated land reduction. In the scope of observational data, the relationship between the prosperous level and the cultivated land area is similar to the Environmental Kuznets Curve, and Suzhou City is at the early stage of the curve, that is, the period of prominent contradictions.

结果表明：在诸多影响因素中，人口数量的变化是引起改革开放以来苏州市耕地面积减少的主要因素；而第三产业增加值占地区生产总值比重和城市化率的变化对耕地面积的减少也发挥着重要作用；在观测数据范围内，富裕度和耕地面积之间存在类似环境Kuznets曲线，并且苏州市正处于该曲线的前期阶段，属于矛盾的凸显期。

However after 1945 the cultivated area obviously assumed the reduced tendency in every local county, and the cultivated area reduced 25.6% in the year of 1948 than 1944, and some 51.6% of newly reclaimed wastelands were counterbalanced by wasted tilth.

根据民国和田耕地撂荒的档案资料分析，此时期水资源状况基本保持在一个较为稳定的水平上，对地区耕地大面积撂荒不是决定性因子，但却是制约各地区人口数量、垦荒规模和耕地面积总水平的关键因子。

After 1945 the cultivated area obviously assumed the reduced tendency in every local county, and the cultivated area reduced 25.6% in the year of 1948 than 1944, and some 51.6% of newly reclaimed wastelands were counterbalanced by wasted tilth.

根据民国和田耕地撂荒的档案资料，此时期水资源状况基本保持在一个较为稳定的水平上，对地区耕地大面积撂荒不是决定性因子，但却是制约各地区人口数量、垦荒规模和耕地面积总水平的关键因子。

The flaw that exists in the tillable field protection policy laid down by the central government and deviation from the policy hypothetical goal in implementation by the local government lead to the breakdown of the tillable field protection policy. Finally, the author proposes some countermeasures about tillable field protection policy.

本文认为中央政府在耕地保护政策设计过程中存在的缺陷和地方政府在政策的执行过程中偏离了政策设定的目标是导致耕地保护政策不能完全发挥其作用的最重要的原因，最后就此提出了改变我国现行耕地保护政策的一些思路。

Article 37 All units and individuals shall be prohibited to let cultivated land lie idle or make it barren.

第三十七条禁止任何单位和个人闲置、荒芜耕地。已经办理审批手续的非农业建设占用耕地，一年内不用而又可以耕种并收获的，应当由原耕种该幅耕地的集体或者个人恢复耕种，也可以由用地单位组织耕种；一年以上未动工建设的，应当按照省、自治区、直辖市的规定缴纳闲置费；连续二年未使用的，经原批准机关批准，由县级以上人民政府无偿收回用地单位的土地使用权；该幅土地原为农民集体所有的，应当交由原农村集体经济组织恢复耕种。

Thus,it is paid much attention to by all people from all walks of life.

因此，重视耕地质量建设，落实耕地地力评价，实现耕地科学管理，在相当长的时期内，都将是我国政府和研究者急待解决的课题。

Baaed on the 50-year statistical data（ 1949 ～ 1998 ） on Huzhou City, the change processes and the regional differences of cultivated lands were analyzed and the relationship between cultivated land change and economic development quantified.

文章摘要：采用湖州市及所辖县市区50年统计数据，分析了湖州市耕地资源变化过程及区域差异，并定量分析了湖州市耕地资源变化与经济发展的关系，对不同经济发展水平耕地占用量进行了估算。

It is influenced by resources,the level of economic development,management,policy and other factors.The paper sets up indexs of assessing,and analyses the status of cultivated land resources quantity security on time and space.The result indicts that since the reform and open,the level of security ascended firstly then descended.From the point of view of regional distribution,the security standard o...

本文在分析耕地资源数量安全影响因素的基础上，构建其评价指标体系，并对我国耕地资源数量安全的时空差异规律进行了分析，结果表明，自改革开放以来，我国耕地资源数量安全状况呈先增后减的变化趋势；从安全水平的区域分布来看，北部和西部省份的安全水平普遍高于东部和南部省份，同时发现，区域安全水平与经济发展水平呈负相关关系。

The results show that an internal and mutual transformation of land-use types cause striking changes in soil erosion extent. The transition of cultivated land to woodland and grassland medicates erosion intensity, and the one from forestland to cultivated land and grassland aggravates erosion. In addition, land-use practices, including mainly human activities, have impacts on the content of suspended sediment.

研究表明，本区土地利用类型的内部转化和相互转化引起土壤侵蚀程度的明显变化；耕地向林地、草地的转化使侵蚀强度指数显著降低；林地向耕地、草地转化，均显著增加侵蚀强度指数；耕地、林地、草地的内部转化对土壤侵蚀也有少量影响。

Based on long-term statistical data of cultivated land and economy, and land use survey data since municipalized, this paper focuses on relation between cultivated land use change and socio-economic development, and the cultivated land change since municipalized.

根据重庆市1952-2003年长序列耕地和经济统计数据及1997年重庆市直辖以来土地利用调查数据，重点分析了重庆市耕地利用变化与社会经济发展的关系，以及直辖以来耕地的变化情况。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。