耕地

Wetland reduces 263122.5 hm2 from 1954 to 2000. The cultivated land increase engrosses lots of grassland and wetland; the woodland decreases except from 1954 to 1976;the village and town construction expands.

结果表明：整个时段耕地和城乡用地面积增加，草地和沼泽湿地面积减少，林地和水域除1954～1976年呈增加外，其他时段呈现减少的趋势。

Based on the analysis of natural and human activity factors which affected soil quality, the technical methods to sustainable utilization of cultivated land resources including district improvement, rational distribution, preventing soil erosion, rational fertility fertilization, reforming the faming systems were proposed.

在人为因素中，不合理的垦荒种植，难以改变的小型四轮拖拉机表土翻耕方式，不科学的肥料使用、管理方式，以及人口增长和经济社会发展的负面影响，都促使耕地质量在演变中逐步形成退化。

In traditional agricultural production , farmers always fertilizes the land at their own will , which not only increased the cost of agriculture production and worsened the soil fertility , but also caused serious environmental pollution and threaten .

传统农业生产中，由于农民盲目施肥现象严重，这样不仅造成肥料利用率下降，也增加了农业生产的成本，使得耕地地力下降，而且也带来严重的环境污染，威胁农产品质量安全。

This change may brought tremendous benefits to the economy of zoology:① the forest land renew as elements of Kai county landscape, the cover ratio of forest increase obviously to 66.29% from 22.55% now, gain double. At the same time, the scale and intension of the soil erosion will control efficiently with the disappearances of the steep slope which use for furrowing; and it don't exist converse succession, it also make the whole landscape ecosystem system enter into virtuous circle.

这种变化将产生巨大的生态经济效益：①有林地重新恢复为开县景观的基质，森林覆盖率显著增加，将由目前的22.55%增至66.29%，净增2倍，同时，陡坡耕地全部消失，水土流失规模和强度将得到有效控制，现有不少嵌块体的逆向演替将不复存在，使整个景观生态系统进入良胜发展。

These increased harvests mean that 22％ of world's people are fed just 7％ of the farmland in China.

这些增加的收成意味着中国7％的耕地能养活世界上22％的人口。

But it couldn\'t be sowed or with a low emergence rate for drought.The fluid hilling of maize was put forward in this study which combines the functions of water preserving agent,the watering bed sowing,the properties of the soaked seeds and fluid sowing.

目前我国47%的地区年均降水量不足400mm，每年受旱农田面积占整个耕地面积的25%～30%，干旱造成的损失超过其它所有自然灾害。

The result shows that（1）the region distributes majority of grassland and forested area, insetting some farmland and water etc.

结果显示为：（1）布尔津县以草地、林地为主要景观类型，镶嵌着耕地、水域等景观类型。

The total area of 27,818 mu of cultivated land, of which 22,600 acres of irrigated area.

总耕地面积27818亩，其中水浇地面积22600亩。

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

Land use changes become meeker, with less changing range.

耕地、草地与未利用土地面积略有增加。

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。