耕地的

In this paper,soil erosion during the railroading engineering is analyzed in a systematic way;including the scope of duty on prevention of soil erosion, the topographic units, easy to be erided and the dynamic factors for soil erosion,etc.

我国是一个水土流失比较严重的国家，人口众多、耕地少、水土资源相对匮乏，特殊的国情和复杂的自然条件，决定了水土保持在国民经济和社会发展中的重要的地位和作用[1]。

Therefore, to eradicate the problem of prevalence of Schistosomiasis in the Dongting Lake area, we must implement a set of systematic plans to reconvert farmland to lakes, that is, to gradually relocate the population in the lake area and change the existing farmland into lakes to recover the past vast surface of the Dongting Lake and reestablish biological balance in the lake area, so that human beings and the creature Schistosome can again coexist in harmony in nature.

因此要想从根本上解决洞庭湖区血吸虫病流行的问题，必须实施一套系统的退耕还湖计划，也就是逐步将湖区人口转移，将现在的耕地变为湖面，恢复昔日洞庭湖辽阔的湖面，重新建立湖区的生态平衡，人类与血吸虫这种生物将再次在自然界和谐共存。

The amount of pesticide and herbcide applied was less, the pure quantity was only 1. 9kg/ha which is about 40％ of the Jinlin Province's average. In farmland, There are 26700ha of solonetz and solonchak, and 289700ha of salinized soil with the high content of salts. The salt content in the surface is 1％-2％ in soda meadow solonetz, 1％-4％ in sulfate meadow solonetz, below 0.7％ in meadow solonchak generally, and below 1％ in salinized soil. The runoff and the return flow from above lands have high content of salt and high output load of the soluble salt.

吉林西部耕地中有2.67万hm〓的盐土、碱土和28.97万hm〓的盐碱化土地，这些盐土、碱土及盐碱化土地中均含有较高的盐分，其中苏打草甸盐土表层含盐量1％～2％，硫酸盐草甸盐土表层含盐量可达1％～4％，草甸碱土含盐量一般。7％，来自于这些土地的地表径流和农田回归水中盐分含量高，可溶盐的输出负荷大。

Soil salinity is a severe global problem, nearly 10% of the total land surface is coved with different types of salt affected soils.

土壤盐渍化对农林业的影响是一个全球性的问题，全球20％的耕地和近半数的灌溉土地都受到不同程度的盐害威胁，所以植物抗盐育种一直是研究热点。

According to calculation of obstacle degree, the obstacle factor of sustainable land use was analyzed in detail. The factors such as per capita agricultural gross output value, per unit area yield of grain, reed land rate, agricultural land rate and degree of townish are the main obstacle factor ofKey words: land use; sustainability; obstacle degree; The Yellow River Delta

研究结果表明：在34个因子中人均农业总产值、粮食单产、芦苇地占地率、农业用地率、城镇化水平是黄河三角洲可持续土地利用的主要障碍因素，其中芦苇地占地率在1996年以后始终是第一障碍因素，而人均农业总产值的限制主要出现在1998年之前，之后对可持续土地利用未构成障碍；粮食单产和农业用地率的影响主要出现在1996年以后；林草覆盖率、公顷耕地农机总动力和农村电气化水平在一半以上的年份对可持续土地利用构成障碍；在1994年之前，农民人均收入障碍度较大，是主要的障碍因素。

The result indicates that with the development of city and increase in country economy, the ratio of land use improved gradually. Neijiang Downtown was in the stage of adjustment, but the degree of land use of the whole city were in the stage of development.Because of implementation of protecting cultivated land policy,this trend of change is unnotable,so Neijiang city was in the stage of steady development.

结果表明：随着内江市城市化的发展以及农村工业化的增长，土地利用率逐渐提高；除市中区处于调整期外，各区县及整个内江市的土地利用程度处于一种上升趋势；由于耕地保护政策的有效实施，整体趋势变化幅度不大，内江市的土地利用处于一个平稳发展时期。

Because Rwanda is the most densely populated country of the world, now the 1.3 million square meters land free of mines can be turned into farming fields as well as eliminate the threat of death and maiming.

由于卢旺达是世界上人口最密集的国家，现在这片被清除完地雷的130万平方米的土地可以被变成亟需的耕地以及用来消除死亡和致残的威胁

Every month sees thousands of protests across China by poor farmers outraged at the expropriation of their land for piffling or no compensation.

每个月都有成千上万的中国贫困农民土地因一些微不足的道理和少得可怜的赔偿被强制征用，前些年，安抚这些耕地引起的冲突是全国人大的主要议题。

Base on analysis the status of "The project on reverting farmland to forests and grassland in China", the study point out: because of without area overall arrangement based on science, and without scientific inspect-estimate system, the policy effect on reverting farmland to forests and grassland has been rebated.

通过研究中国退耕还林还草的现状及问题，指出由于退耕区域布局缺少严密的科学论证，监督检查没有科学的评价体系，致使政策效果大打折扣；退耕补偿政策的不合理、不公平性以及退耕地未来收益的不确定性，又使退耕还林还草成果巩固面临潜在威胁。

Therefore, the recent Ministry of Land and Resources Gate I area from land development and consolidation of innovation management system to start, and constantly improve our land development and consolidation of the management level, to ensure that our region's land development and consolidation projects and improve the quality of new arable land.

因此，最近国土资源部门我区土地开发整理的创新管理系统开始，不断完善我们的土地上发展和巩固的管理水平，以确保本地区的土地开发整理项目和改善质量的新耕地。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。