耕地

Farmland quality is poorer, amount of average per capita is little, mothball resource scarcity.

耕地质量较差，人均数量少，后备资源不足。

Multiple cropping is one of major cropping systems in China and plays an important role in improving comprehensive productivity of cultivated land and ensuring national food security.

复种是我国重要的农作制度之一，对于提高我国耕地综合生产能力和确保国家粮食安全具有重要作用。

Second, the threshold for each feature was brought up by using CART Algorithm. Finally, the multiple cropping index of 15 provinces of Northern China were extracted in 2005. Then, the result was compared with that of former researches, and it shows that DT method is more efficient.

最终，采用MODIS（moderate-resolution imaging spectroradiometer）/EVI数据，提取了2005年中国北方15个省市区的耕地复种指数，与之前的研究结果进行比较验证发现该方法具有较高的提取效率和精度。

Then,this paper predicts the quantity of farmland in 2020,2030 and 2040 with the multivariate regression analysis.

耕地的数量和质量反映一个国家的基本国情，大体上决定国家的人口承载量和可持续发展能力[1]。

In addition, multivariate statistics simulation models (the correlation and regression analysis) are employed to account for the relationship between the cultivated land changes and soci-economic factors.

在相关分析的基础上，运用相关分析法和多元回归法分析耕地面积变化和社会经济因素变化的关系，建立区域土地利用／覆被变化的驱动力模型，提出各个土地利用区的主导驱动力分类。

Honesty and trust are promoted, and good neighborliness cultivated.

诚实守信是促进睦邻友好和耕地。

It is fundamental condition: Benefit 810 thousand population, 970 thousand mus of farmland, mountain forest area 4.2 million mus, careless field 1.2 million mus, it is famous " the countryside of metasequoia "," the countryside of spinach "," the countryside of the rhizome of Chinese goldthread "," nicotian countryside ", the mineral products such as fossil of natural gas, bittern, coal, gesso, ancient biology is resourceful, development property has certain base.

081万人口，97万亩耕地，山林面积420万亩，草场120万亩，是有名的"水杉之乡"、"菠菜之乡"、"黄连之乡"、"烟草之乡"，天然气、卤水、煤炭、石膏、古生物化石等矿产资源丰富，发展产业有一定基础。

In this paper,the root nodulation of young Alnus formosana and its relations with soil nutrients on four forestlands converted from agricultural lands in Sichuan Province were studied.

以四川省广元、北川、平武和丹棱4个地区退耕地内生长良好的幼龄台湾桤木为研究对象，对其根系结瘤情况及其与土壤养分含量的关系进行研究。

Last year, the wheat land area increase to 3 5th oof the total landind area

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。

In 2003,on the whole the soils in Wujiang were little acid, pH from 6.40±0.38 to 5.40±0.55now, and the trend of acid was in Tailake region. The available phosphorous in Paddyfield were significantly lower than. the other five land use patterns. As a result,controlling the phosphorous output form vegetable field mulberry yard and other dryland might be more significant to control the non-point pollution in Tailake region.

吴江市土壤基本上属微酸性土壤，2003年耕地监测中土壤pH值由1982年的6.40+0.38变为5.40±0.55，可见近20年来太湖地区普遍存在的酸化趋势；在稻田、林地、桑园、菜地、果园、旱地六种常见的土地利用方式中，稻田土壤速效磷显著低于其它五种利用方式中；因此，在控制太湖地区磷的面源污染上，控制菜地、桑园和其它旱地土壤磷的输出可能更为迫切。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。