土地的耕作

The conclusions show that most of the agricultural land resources are of good quality. However, the dry land and paddy field covering an area of \{17.11\} km\+2 are contaminated seriously heavy metals, which are not fit for growing crops. At the same time, the high\|quality plowland, which i...

定量评价的结果表明，区域农业土地资源中大部分土地资源质量较好，但旱地和水田共有 1 7.1 1km2 的重金属重度污染区，这部分耕地已不适宜种植农作物，同时，适合人类耕作的高质量耕地由于土壤重金属污染减少了近 1 / 3 ，说明贵阳市区进行土壤重金属污染防治具有重要的意义。

In this paper, as a case of Karamay, we have studied on space-time changement of soil quality in oasis of arid area. We measured quality for different land use types and years in same type by combinativing field sampling for Karamay in Xinjiang and analysis in laboratory, which is directed by former theory of soil quality. Then we did integrated evaluation of soil quality for different land use types, and had drew some conclusions as followed: In four land use types, the soil bulk density of layers(0～15cm) for farmland and tree land is bigger than the other land use types.The organic matter of every layer in manpower Tamarix Bulrush land is bigger; organic matter of Tamarix Bulrush land release efficiency nitrogen which result ration of C/N is higher; total nitrogen of all layers in farmland variety great as being effected by mass use of nitrogen in agriculture; deadwood and defoliation of tree、shrub and bulrush pooled in 5cm layer to result that quick nitrogen is the biggest among all layers. The total salt of nature shrub tree land for every layer being bigger than farmland explain that nature shrub thee land strongly stand salt and farmland for basification in this area; that the nutrient of face layer is bigger than the ground layer may be explained by that vegetation gather nutrient to be stored in deadwood and defoliation.

本文对以克拉玛依为例，对干旱区绿洲土壤质量的时间空间变化进行研究，在有关土壤质量的研究理论指导下，通过田间调查取样和室内分析相结合的方法，对新疆克拉玛依市农业开发区的不同土地利用方式及同一土地利用方式下不同利用年限土样土壤理化性质进行测定，从而对新垦绿洲不同土地利用类型土壤质量进行综合评价，结果如下：四种土地利用方式中，农地、乔木林地表层(0-15cm)土壤容重较大；各土层人工柽柳芦苇地的土壤有机质含量均较大；柽柳芦苇地的有机质在矿化过程中所释放出有效氮，导致柽柳芦苇地的C/N比例较高；受到农业耕作使用大量氮肥的影响，农地各土层全氮含量变异较明显；乔木、灌木及芦苇的枯枝落叶主要集中在5cm范围之内，导致几种土地利用方式类型下该层土壤速效氮最大；天然灌木林地的土壤总盐在各层均较大，其次是农地，说明天然灌木林地的高耐盐能力，以及该区农业生产用地的土壤盐碱化程度较重。

The causation of the cosmical escape are all types . such as labor style turned collective farming to petty farmer farming ; clan lived together turned to a family lived alone ; feodal bureaucracy instead the hereditary ; the annex of the earth ; natural calamity ;the corruption of the officials ; chaos caused by war and so on .

引起大规模逃亡犯罪出现的表层原因有土地兼并、苛捐杂税、自然灾害、吏治腐败、战乱侵扰等等：而深层原因则在于社会劳动方式从村社集体耕作变为小农独立耕作、基层经济组织由宗族为单位变为小家庭独立生产、政治制度由封建官僚代替世卿世禄等经济、政治制度的变化。

Roughness, surface crust, erodible fraction, stubble and time of efficacy are the indicators for appraisal. Results show that herd grazing has worst effects on soils; plowing is positive to the soils with lower erodibility and negative to sandy soils.(4) Prediction and control of wind erosion are the end of research. Two famous prediction models WEQ and WEPS were briefly introduced. On the basis of summarizing general theory and methodology for wind erosion control, some key measures are suggested for the region of Ningxia.

评价结果显示秋季耕作、春季耕作、火烧、放牧等活动使农田表层土壤风蚀加剧；（4）首先介绍了美国风蚀预测模型，在比较全面地总结前人研究的基础上，本文概括了防治风蚀的一般原理与方法，针对宁夏地区，除了改进土地利用方式外，注意可风蚀性不同的土壤应采取不同的措施。

In order to evaluate the effect of different tillage types on soil moisture,the paper analyses the temporal and spatial variations of soil moisture under plough tillage and no-tillage.

为了揭示农牧交错地区不同农田耕作方式对其水分环境的影响过程及规律，选择翻耕地和免耕地两种土地耕作类型，分析不同耕作方式下土壤水分的时空变化情况。

The right to contracted land management in rural areas is refers to the right of citizen legally plants, cultivats, or rases livestock in the land which is possessed to the country or coollective, and get income.

农村土地承包经营权是指，农业经营者在法律规定和合同约定的范围内，在集体经济组织所有的或者国家所有的由集体经济组织长期使用的土地上进行耕作、养殖或畜牧并获得收益的权利。

All over the southern Midwest states, farmers, no longer able to make a living because of land banks, weather, and machine farming, had sold or were forced out of the farms they had tenanted.

由于土地银行、天气和机器耕作等种种原因，南方所有中西部各州无法谋生的农民不是卖掉了土地，便是被迫退出他们租佃的土地。

On the basis of sampling and chemical examination of soil reclaimed by hydraulic dredge pump that have been cultivated for different time, the paper analyzes their physicochemical property systemically.

本文通过对不同耕作时间泥浆泵复垦土地土壤的取样化验，系统地分析了泥浆泵复垦土地土壤的理化特性，并对其随时间的变异性亦进行为探讨。

As a liturgical festival, Thanksgiving in Canada corresponds to the English and continental European Harvest festival, with churches decorated with cornucopias, pumpkins, corn, wheat sheaves and other harvest bounty, English and European harvest hymns sung on the Sunday of Thanksgiving weekend and scriptural lections drawn from the biblical stories relating to the Jewish harvest festival of Sukkot.

17世纪初，英国的清教徒遭到迫害。1620年9月，102名清教徒登上&五月花&号帆船，于12月26日到达了美国的普利茅斯港，准备开始新的生活。然而，这些移民根本不适应当地环境，第一年冬天过后，只有50人幸存。第二年春天，当地印第安人送给他们很多必需品，并教会他们如何在这块土地上耕作。这一年秋天，移民们获得了大丰收，11月底，移民们请来印第安人共享玉米、南瓜、火鸡等制作成的佳肴，感谢他们的帮助，感谢上帝赐予了一个大丰收。自此，感恩节变成了美国的固定节日。

Burning off large areas of forest or grassland, they would farm the enriched soil until its yield began to drop, and then move off to do the same elsewhere—as practitioners of slash-and-burn agriculture do to this day.

焚烧大片的森林和绿地，他们就可以在肥沃的土地上耕种直到收成减少，然后在到其他的地方如法炮制---一如现今刀耕火种式的耕作方法。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。