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结构土壤
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  “结构土壤”译为未确定词的双语例句
     The improvement of 1 ~ 0.25mm microaggregate showed that the soil granule structure was ameliorated and it formed a good soil granule structure which fits for the growth of the plant.
     1~0.25mm的微团聚体的增加则说明了土壤团粒结构得到了改善,形成了适宜植物生长的土壤团粒结构,土壤肥力得到了提高。
短句来源
     The soil features of the natural grassland in Tongliao city were analyzed and summarized according to the information from the second soil survey of Tongliao city. That results are as fol-lows:(1)Texture of most soils is sand soil, which has only small grain structure or no structure and has less soil organic matter,total nitrogen,total phosphorus and lower water capacity of field.
     在阐述通辽市地理位置、地貌、气候、植被、土壤以及天然草地类型的基础上,运用第二次土壤普查资料,分析并归纳出通辽市天然草地土壤性状特征:(1)天然草地土壤质地偏砂,土壤结构多为无结构或小粒状结构,土壤有机质、全氮、全磷含量以及土壤阳离子代换量都较低,土壤容重偏大,田间持水量较低;
短句来源
     Geojute raised water containing quantity by 1.0%~4.5%
     盖布改变了土壤孔隙结构 ,土壤入渗速率比光板地高 12 .5 %。
短句来源
     Analysis of Grounding Systems Buried in Soils with Massive Texture
     块状结构土壤中的接地系统分析
短句来源
     Experimental Study of Reducing Infiltration Effects under Surge Infiltration in Different Soil Structures
     不同结构土壤间歇入渗减渗效果的试验研究
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  相似匹配句对
     PHYSICAL AND MORPHOLOGICAL STUDIES ON SOIL STRUCTURE
     土壤结构的性态研究
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     The management to soil granular structure
     土壤团粒结构管理
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     Using AFS algebra and AFS structure, any human ordinary fuzzy concept can be represented.
     结构
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     Compared the actuality of the structure of th
     *; 结构;
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  structural soil
Effect of fractionation on the enzymatic state and behaviour of enzyme activities in different structural soil units
      
The soil in whose mass loose mechanical elements or water unstable crumbs dominate, do not have the properties of a structural soil.
      


The mode of genesis of plate-like structure of soils under different conditions may be different.Broad field observation reveals that soils favoring plate-like structure formation generally have an easy access to an abundant but intermittant supply of water,low content of raw organic matter as well as of humus,indefiniteness but not being too sandy in tex- ture,and weakness in structural stability. The present paper reports the evidences gathered from the field obser, vation and laboratory experiments showing...

The mode of genesis of plate-like structure of soils under different conditions may be different.Broad field observation reveals that soils favoring plate-like structure formation generally have an easy access to an abundant but intermittant supply of water,low content of raw organic matter as well as of humus,indefiniteness but not being too sandy in tex- ture,and weakness in structural stability. The present paper reports the evidences gathered from the field obser, vation and laboratory experiments showing that plate-like structure can be developed through the effect of alternate wetting and drying processes. Laboratory experiments have shown that the degree of perfection of the development of plate-like structure as evidenced both from the horizontal natural crackings and from the volume of swelling of the soil body in- creases with increase in the number of cycles of alternate wetting and drying.(Plate Ⅰ.)In order to assure the effectiveness of the processes, both drying and wetting should be carried out as thorough as possible. A mechanism explaining the formation of plate-like structure is pro- posed.According to the suggested mechanism,swelling of the soil as a result of wetting affords the necessary conditions for the formations of plate-like structure,while the actual development of structural plates is accomplished through the drying processes.The greater the rate of drying, the better the conditions for the development of plate-like structure. The horizontal axis of the structural plates as demonstrated by the laboratory experiments runs parallelly to the contour of the drying sur- face.The development of plate-Iike structure is greatly hindered by exerting pressure on the surface upon wetting.Microscopic examination of the structural units reveals that no definite orientation of the individual soil particles are noticeable and the horizontal crackings separating layers of structural plates were seen to be discontinuous and of non-uniform in dimension. The following is a brief account of the mechanism of plate-like struc- ture formation through the effect of alternate wetting and drying processes: The evaporation of water from the saturated soil leads first of all to the formation of a thin crust on the very surface of evaporation.This leaves,beneath the crust a series of cracking spaces parallel to the surface due to the shrinkage of the soil while drying.Further drying compels water to evaporate from below the surface into these cracking spaces. Thus a second layer of laminated dry soil may form below the first layer of the surface crust.As evaporation continues on,the process repeats itself with decreasing intensities because part of water will be lost inevitably through the few connections that may exist between adjacent layers of structural plates.The layers developed below the surface crust are of course somewhat different in nature because the conditions of drying pre- vailing here are different.Thus the drying out of the soil below the surface usually proceeds in a much more restricted rate——a fact,that may explain the presence of structural plates in the underlying layers which are absent in the surface crust.On rewetting the soil,the particles or aggregates in cracking spaces then may serve as wedges to push layers of structural plates further apart as a result of swelling. This theory may afford explanations to the facts that in the laboratory experiments better development of plate-like structure is always accom- panied by the greater extent of swelling of the soil and the latter in turn can be augmented by increasing the number of cycles of alternate wetting and drying processes.The proposed mechanism also suggests that not only should both wetting and drying be thorough enough so as to assure the formation of as many horizontal crackings and structural plates as possible, but also the rate of drying should be great enough to check as much as possible the lose of water through capillary action.It is also evident ac- cording to the supposition given above that any factor inhibiting the swelling of the soil,(such as pressure exerted upon the surface)will make it impossible to develope plate-like structure through alternate wetting and drying processes.As further evidences to support the suggested mechanism, it is worth while to point out the facts that plate-like structure usually occurs near the soil surface and that structural plates run always parallelly to the surface of evaporation. The soils that are most liable to the formation of plate-like structure according to this mechanism are those medium in texture,and low in organic matter and colloid contents. The plate-like structure thus developed is believed to be temporary in the sense that it will be easily disintegrated by either mechanical forces as practiced in the usual cultivation processes or by prolonged flooding followed by imcomplete drying.

一、片状结构形成的原因很多,但在地表常见的一种可能不是沉积、水冻或压力等原因造成,而系常经干湿变异的结果。二、在干湿变异条件下产生的片状结构分布地区甚广,可能其形成与土壤种类无直接关系。凡地面少植被、原缺乏结构的土壤,如不受人为翻动,露于地面一定时期后,多半会产生不同明显程度的片状结构。三、土壤在干湿变异条件下产生片状结构可能为一简单的机械作用。即土块湿润时膨胀,体积变大,再经干燥,体积不能恢复,留下横向裂隙于土中,遂成片状结构。在所研究的各因子中,干湿变异次数多、干湿变异程度大以及干湿变异中脱水速率快均能促使土块膨胀,所以能使片状结构形成更为明显。如对土块施以压力,不予膨胀,虽土块具有各方面生成片状结构的良好条件,仍不能形成片状结构。对田间具片状结构土块的试验中,说明它可能与室内人工片状结构有相同的成因,一方面也说明了这种结构的不稳定,易于破坏,但如条件适合,形成也不困难。四、此种片状结构因系土块干燥时产生横向裂隙所形成,所以结构横轴生成的方向主要决定于水分的蒸发面而经常与之平行。这种关系在野外具体表现为结构横轴常与地表平行,在室内的几项试验结果与此也相符合。此外结构横轴形成的方向是否与土块湿润时水分进行的...

一、片状结构形成的原因很多,但在地表常见的一种可能不是沉积、水冻或压力等原因造成,而系常经干湿变异的结果。二、在干湿变异条件下产生的片状结构分布地区甚广,可能其形成与土壤种类无直接关系。凡地面少植被、原缺乏结构的土壤,如不受人为翻动,露于地面一定时期后,多半会产生不同明显程度的片状结构。三、土壤在干湿变异条件下产生片状结构可能为一简单的机械作用。即土块湿润时膨胀,体积变大,再经干燥,体积不能恢复,留下横向裂隙于土中,遂成片状结构。在所研究的各因子中,干湿变异次数多、干湿变异程度大以及干湿变异中脱水速率快均能促使土块膨胀,所以能使片状结构形成更为明显。如对土块施以压力,不予膨胀,虽土块具有各方面生成片状结构的良好条件,仍不能形成片状结构。对田间具片状结构土块的试验中,说明它可能与室内人工片状结构有相同的成因,一方面也说明了这种结构的不稳定,易于破坏,但如条件适合,形成也不困难。四、此种片状结构因系土块干燥时产生横向裂隙所形成,所以结构横轴生成的方向主要决定于水分的蒸发面而经常与之平行。这种关系在野外具体表现为结构横轴常与地表平行,在室内的几项试验结果与此也相符合。此外结构横轴形成的方向是否与土块湿润时水分进行的方向有关,还待进一步的研究解决。五、通常所见的片状结构每每愈至土壤深处愈不明显,推测其原因可能是下层土壤具有以下特性:①干湿变异程度小,②干燥时脱水速率慢,③受到上部土层的压力,湿时不易膨胀,是几方面生成上的不利条件综合影响下的结果。六、片状结构容易在冲积母质的土壤上、滨海盐土地带以及碱土地区等处表土上发现,这可能与:地势平坦,水分易于停积;植被稀疏;土壤缺乏结构;或下层坚实,水分常积于上部,使表土能充分湿润等因子有关。在灰化土及生草灰化土地区,A_2 层中的片状结构结构是否具有上述同样的成因,还不能肯定,但有些条件很值得注意,如 A_2层缺乏有机质,没有良好结构;下面有一坚实的B 层,水分易在此停积;一般 A_2层距地表不远;同时在质地方面含粉砂较多,说明其片状结构也可能是干湿变异的结果。七、质地在片状结构的形成上也可能是影响较大的因子之一,工作中初步的印象是含粉砂或细砂较多的土壤易于形成,土块内粘结力过强时不易形成,但迄无充分证据,还有待进一步的研究。

In this paper,the author proposed a model in which ft buried box structure is replaced by a equivalent soil layer.The dynamic response analysis of which may be divided into two steps.1.Analysis of wave propagation in layers.In this step,the interaction force on the surface between the soiland the structure can be obtained.2.Using the above interaction force as the load,the dynamical analysis of the buried box structure is carried out as if it lies on the ground.Calculation shows that the proposed method gives...

In this paper,the author proposed a model in which ft buried box structure is replaced by a equivalent soil layer.The dynamic response analysis of which may be divided into two steps.1.Analysis of wave propagation in layers.In this step,the interaction force on the surface between the soiland the structure can be obtained.2.Using the above interaction force as the load,the dynamical analysis of the buried box structure is carried out as if it lies on the ground.Calculation shows that the proposed method gives a result which is in accord with that of the finite element method.

本文提出了将土中箱形结构化为等效土层的等效层模型,并建议将土中箱形结构的动力反应分析按两步进行:第一步,对等效层模型进行波动分析,求出结构——土壤交界面处的相互作用力;第二步,将由第一步所得相互作用力作为荷载,将土中箱形结构如同地上结构一样,用一般结构动力学方法进行动力反应分析。文中给出了比较计算结果,说明所建议的模型和分析方法有很好的计算精度。

In this PaPer, waterstable soil structure of cultivated horizon is discussed on the basis of analytical data of ton soil tyPes (i.e. Black soil. Bog soil. Gray forest soil. Guan-yu soil. Paddy soil. solonchak. Burogen. Chestnut soil Drab soil and chao soil) collected from Hebeie Province. The results obtained are summarized as follows: Ⅰ. With large amount of humic substances, black soils and bog soilsare well aggregated and highly stable in structure, so the content of waterstable macroaggregates (>0.25mm)...

In this PaPer, waterstable soil structure of cultivated horizon is discussed on the basis of analytical data of ton soil tyPes (i.e. Black soil. Bog soil. Gray forest soil. Guan-yu soil. Paddy soil. solonchak. Burogen. Chestnut soil Drab soil and chao soil) collected from Hebeie Province. The results obtained are summarized as follows: Ⅰ. With large amount of humic substances, black soils and bog soilsare well aggregated and highly stable in structure, so the content of waterstable macroaggregates (>0.25mm) is more than 60%; but that in guan-yu soils. warped chao soils and a part of burogon (where the plants arewell protected is more than 40%, and that in other soils is less than 40%. In terms of area, drab soil is the most prevalent, but the content of waterstable macroaggreates in it is, in most part, less than 30%, and that in chao soils widely distributed on the alluvial plain is less than 20%. In ordinary chestnut soils and slonhaks (which contains inland solonchaks and coastal solonchaks), the content of waterstable macroaggregates is less than 10%, and in Certein case, it is even lower than 5%. 2. The structural coefficiant of soils in HeBei Province is mostly more than 40%, and in most cases it is more than 60%; but only in solonh aksit is less than 40%.

对河北省十个主要土壤类型的耕层土壤结构进行了水稳性分析,得到了如下结果: 1、除了黑土和沼泽土这二个土壤类型,其水稳性大团聚体总量在60%以上,和灌淤土、粘质潮土和部分棕壤(植被保护好的)在40%以上外。其他土壤都在40%以下。尤其是分布面积最大的褐土,大部分在30%以下。广大冲积平原上的潮土,大部分在20%以下。普通栗钙土和盐土(包括内陆盐土和滨海盐土),在10%以下,低的甚至在5%以下。 2、河北省土壤的结构系数大部在40%以上,其中许多土壤在60%以上,仅有盐土在40%以下。若干研究工作和生产实践表明,土壤结构是土壤肥力的基础。具有良好结构的土壤,能调节土壤中的水、气、热、肥的矛盾,满足作物高产稳产的需要。土壤结构问题涉及面较广,本文仅对河北省十个主要土壤类型的表层(0—20厘米)土壤水稳性结构状况进行初步探讨。

 
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