耕地的

Vast expanses of marsh that used to abound with reeds have been converted into arable land.

曾经是芦苇丛生的大片沼泽地已经变成了耕地。

Last year,this area the acreage of growing wheat has increased three-fifths of the total.

去年，这个地区种小麦土地面积增加到全地区耕地面积的五分之三。

Based on the disadvantages of GM(1,1) prediction, this paper tries modifying it, and the modifying model is identified by the prediction of amble land in Wuhu City.

摘要针对GM(1，1)模型预测的不足，对其进行修正得到修正模型，并利用芜湖市耕地变化进行实例验证和应用。

As we have to ensure preservation of arable land, the use of urban land is inevitable.

我们必须保护耕地，所以，征用城市用地是不可避免的。

The insufficiency of the arable land resource in support is one of the situations of our country.

耕地后备资源不足是我国的基本国情之一。

The biggest problem of Chinese farmers is the shortage of arable land.

中国农民的最大问题是耕地短缺。

Multiple cropping system is a special characteristic of agriculture in China, which has crucial function on feeding 22% people of the whole word by 10% cultivate field of the whole world.

中国农业能以占世界 10%的耕地养活世界上 22%的人口，多熟种植起着决定性的作用。复种指数作为耕地耕作能力的主要指标以及气候农业生产模型中的必需变量，一直是基于行政单元的统计，存在较多的问题，不易于评价与研究。

The CCFG is a kind of economical activity with positive externality, its final products offered -the ecological benefits belong to the pure public goods, the nature of the economical compensation is to internalize the externality of the CCFG, so an economical compensation mechanism should be established with the government playing a leading role. The compensation receivers should be not only peasant households but also the county-level authority that performs the project. Besides central government, the compensation payers should still include the provincial-level governments who implement the project, the provincial-level governments of those beneficiary areas of midstream and downstream of basin, international organizations, enterprises and individuals, etc. Multiple channels of raising funds for the program should be worked out and the practice method should be transformed. Thediversified compensation ways should be chosen. In reality, insufficient compensation is the normality, the cost compensation may have more maneuverability. The decision-maker should carry on proper adjustment to the compensation standard, taking into account the factors about the environment conditions, the social-economic conditions, the ecological function of vegetation, etc. and make out different compensation criterions for different areas and different levels. The author puts forward it should be kept the policy of financial subsidies to the farmers who reforest ecological forest for a long term, should prolong the compensation time frameworks to the farmers who reforest economical forest.

本文认为，退耕还林还草是一项具有正外部性的经济活动，其提供的最终产品—生态效益属典型公共产品，经济补偿的实质就是要实现这种外部性的内部化，故应构建以政府为主导的经济补偿机制；补偿对象除了退耕农户以外，还应包括实施退耕还林还草的县级政府；补偿主体除中央政府外，还需将退耕地区省级政府、流域中下游受益地区的省级政府、国际社会、企业和个人等纳入其中；多渠道筹措退耕还林还草补偿投入资金，切实转变经济补偿的运作方式；选择相互协调、相互补充的多样化补偿方式；现实中，不充分补偿是常态，实行成本补偿更具可操作性；应对补偿标准进行适当调整，在综合考虑退耕地区自然环境条件、社会经济状况以及林草植被的生态功能等多种因素的基础上，制定分区分级补偿标准：对还生态林应采取长期补偿政策，对还经济林也要适当延长补偿年限。

Determined by the specific geological background of Longhetun, the characteristics of the soil resources show abundant calcium and leaning to alkaline. Monomial indexes to evaluate the revisal coefficient of soil adapted to karst mountains areas were screened out combined with the function of karst dynamics system and analysis of characters of each factor about fertility in soil. Predigestion model to soil revisal coefficient monomial assessment was established by successful importation of the content of nutrition elements in plant body, latent efficient elements in soil and available thickness of soil in the cranny of epikarst according to the characters that three carriers of soil, soil water and karst water supply nutrition to plants and two layers of foundation consist of surface soil and soil in epikarst cranny, and several types of soil revisal coefficient and weather-soil productive potentiality were calculated, the results show that the soil revisal coefficient was even more practical after modification than before, which make up of innovation of this study.

龙何屯特殊的地质背景条件决定了耕地土壤资源的富钙偏碱的特点，结合岩溶动力系统的作用，系统分析土壤中各肥力因子的特点，筛选出适宜岩溶石山区特点的土壤订正系数评价单项指标，针对研究区存在土壤、土壤水、岩溶水三种载体提供植物营养和表层土、土下表层岩溶带裂隙土两层空间基质的特点，成功引入植物体内营养元素含量、土壤元素隐性有效态含量及土下表层岩溶带裂隙土有效厚度等新参数指标，探讨建立了土壤订正系数单项指标评价简化模型，计算出龙何屯各耕地类型土壤订正系数和气候-土地生产潜力，结果显示修正后的土壤订正系数比修正前更符合实际，成为本研究的创新点。

With the development of civilization, peoples demand became more and more , land, as an important product stuff ,the intensity of landuse became higher and higher ,as the result: the quantity of farmland decreasing ; average area of tilth deducing ; urban expanding ; in land structure table ,built-up land ascending ,farmland and non-used land declining .

经济的发展，人类社会的进步，人的需求不断的得到满足，土地作为一项重要的生产要素，其利用结构也随之发生着变化：耕地总量的减少，人均耕地面积的下降，城市的扩张，土地利用结构表中，建设用地比例的上升，农用地和未利用地比例的下降等等。

In the United States, chronic alcoholism and hepatitis C are the most common ones.

在美国，慢性酒精中毒，肝炎是最常见的。

If you have any questions, you can contact me anytime.

如果有任何问题，你可以随时联系我。