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土壤变化
相关语句
  soil changes
    Agriculture and Soil Changes
    农业生产与土壤变化
短句来源
    The material cycling in pedosphere is an important portion on the research of the material cycling in global changes. Therefore, studies on pedosphere and on the structure and functions of the material cycling in pedosphere have a close relation to global changes, particularly to global soil changes.
    土壤圈的物质循环是全球变化中物质循环的重要内容,因此,研究土壤圈及其物质循环的结构与功能,对全球变化,特别对全球土壤变化有密切关系。
短句来源
    The research scope and contents of pedosphere in global soil changes include material cycling in pedosphere and the other geospheres;
    土壤圈在全球土壤变化中的研究内容包括:土壤圈与地圈各圈层的物质循环;
短句来源
    And then the main quantitative evaluation methods of soil change was introduced. The problems of soil change's studies was reveales. It was suggested that the key study area of soil change study in the future should be located on medium and large scale soil changes in a long time in order to provide scientific evidences for sustainable and high profit agriculture development.
    系统地分析了土壤变化概念、类型及其变化因素 ,重点论述了当代农业利用的特点及其对土壤环境和土壤性质的影响 ,阐述了当前土壤变化的定量化评价方法 ,揭示了土壤变化研究存在的问题 ,提出了土壤变化研究的重点应放在中尺度和大尺度上 ,为区域持续农业的高效发展提供科学依据。
短句来源
  soil change
    Analysis on Current Situation of Soil Change Studies
    土壤变化研究现状浅析
短句来源
    Simulation on Slope Erosion Process for Soil Change
    应用于土壤变化的坡面侵蚀过程模拟
短句来源
    Since soil change might be a relatively slow process, SLEMSEP is capable of long term simulation if necessary.
    SLEMSEP模型可进行长期模拟,应用于土壤变化和可持续利用的研究。
短句来源
    And then the main quantitative evaluation methods of soil change was introduced. The problems of soil change's studies was reveales. It was suggested that the key study area of soil change study in the future should be located on medium and large scale soil changes in a long time in order to provide scientific evidences for sustainable and high profit agriculture development.
    系统地分析了土壤变化概念、类型及其变化因素 ,重点论述了当代农业利用的特点及其对土壤环境和土壤性质的影响 ,阐述了当前土壤变化的定量化评价方法 ,揭示了土壤变化研究存在的问题 ,提出了土壤变化研究的重点应放在中尺度和大尺度上 ,为区域持续农业的高效发展提供科学依据。
短句来源
  change of soil
    Study on Change of Soil in Several Plantations in Tropical Area of Yunnan
    云南热区几种人工林土壤变化研究
短句来源
    The approximate trend of the change of soil in the plantations of four species is that soil fertility declined slightly from 1993 to 1995, and rose a little from 1995 to 1997.
    4种人工林土壤变化的大致趋势是:1993~1995年肥力大多略呈下降趋势,1995~1997年有所上升。
短句来源
    Soils were selected from several plantations, including Picea asperata Pinus tabulaeformis, Pinus armandii and Larix kaempferi and secondary shrub in Dagou Watershed of the upper reach of Minjiang River. The measurement of TOC, SMBC,WSOC and EOC were made, because these parameters can reflect change of soil characteristics.
    本研究选择岷江上游大沟流域的几种人工林(云杉林、油松林、华山松林、日本落叶松林)以及次生落叶阔叶灌丛下土壤,通过剖面机械分层取样,测定土壤总有机碳(TOC)和三种活性碳组分微生物碳(SMBC)、水溶性碳(WSOC)、易氧化碳(EOC)等来反映土壤变化特点。
短句来源
  “土壤变化”译为未确定词的双语例句
    Study on effects of pinus elliottii stands on soil
    湿地松林分土壤变化研究
短句来源
    NO3--N content reduced sharply with the depth of soil profile in dryland fields.
    从剖面分布来看,旱地农田土壤剖面硝态氮含量自上向下逐渐降低,水田土壤变化不大,通体较低;
短句来源
    Soil biological and biochemical variables are considered to be essential to measure changes in soil quality.
    土壤生物化学性质是重要的监测土壤变化的参数.
短句来源
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  soil changes
The results show that the cohesion of unsaturated soil changes greatly, and the friction angle changes in little with soil moisture content.
      
Lignin concentration was unrelated to either the vegetation gradient or any of the soil changes it encompassed; however, astringent phenolics increased by 275% over the same gradient.
      
A simple erosion/productivity model, Soil Changes Under Agroforestry (SCUAF), is used to predict maize yields over 25 years.
      
An erosion/productivity model, Soil Changes Under Agroforestry, was used to predict the effect of erosion on maize yields.
      
We characterized soil changes with afforestation using ten paired stands of native grasslands and Eucalyptus plantations (10-100 years of age).
      
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  soil change
There are five major hypotheses to explain the apparently synchronous, widespread, spectacular, specific, and sudden elm decline in north-west Europe - climatic change, soil change, competition, human impact, and pathogenic attack.
      
Properties of the soil change as the amount of water occupying the voids varies, and also because of structural change associated with management and with biological activity.
      
Appropriate relate to soil change and the dynamic nature of soil.
      
Integrating soil change in soil survey requires ad-In addition to the amount of C that could be restored, vances in the science of soil change.
      
Making new advances in soil friendly products related to soil change.
      
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  change of soil
It was also obvious from ordination results that some important environmental factors, such as tempo-spatial change of rainfall and corresponding tempo-spatial change of soil moisture, were neglected during direct gradient analysis.
      
Ecological distribution and seasonal change of soil microorganisms in pure and mixed plantations
      
At last the regional change of soil erosion amount on the basis of the color map is analyzed.
      
Past erosion, however, is the most important component to induce change of soil properties.
      
Both gypsum and sulfur reduced potato scab and measurements indicate that change of soil pH was slight (0.1-0.4 pH reduction).
      
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Physical properties of three types of paddy soil collected from south Kiangsu province were studied.The shearing strength of paddy soils increases with the decrease ofmoisture content,especially below the lower plastic limit.Maximum compressibility ap-pears at the high moisture content and it falls sharply near the middle part of plasticityrange.As compared with the soils of heavy texture,the light paddy soils have a highercompressibility and lowering soil water content to a greater extent is necessary to reducetheir...

Physical properties of three types of paddy soil collected from south Kiangsu province were studied.The shearing strength of paddy soils increases with the decrease ofmoisture content,especially below the lower plastic limit.Maximum compressibility ap-pears at the high moisture content and it falls sharply near the middle part of plasticityrange.As compared with the soils of heavy texture,the light paddy soils have a highercompressibility and lowering soil water content to a greater extent is necessary to reducetheir compression.The soil moisture causes shrinkage,especially for soils of heavy texture.Shrinkage makes the paddy soils more compact than mechanical pressure.It issuggested therefore that the optimum soil moisture for the fall cultivation ranges fromlower plastic limit to the medium plasticity and for the spring cultivation the optimummoisture content may be higher than in the fall.

从水稻土的抗切强度,压缩性,收缩性与水分含量的关系作了初步研究和讨论。水稻土的抗切强度随着湿度的降低而增高,塑性下限以下增加更为强烈,不存在一般所谓湿度稍低于塑性下限有一抗机械强度较小的酥软结持阶段。土壤(原状土)的压缩性以湿度大时为最高,随着湿度的降低而变小,接近塑性范围的中部,有一明显的转折点,在这转折点以下(或塑性范围的下部),土壤实际的压缩性是较小的。与旱地土壤的变化规律不一致。原因是水稻土垒结状况和粘结的条件不同。质地轻的土壤比粘重的土壤压缩性大,其压缩性降低至较小程度需要降低的土壤湿度比粘重的土壤为多,但其收缩变紧的程度不强烈,粘重水稻土在湿度降低时发生强烈收缩,使土壤变紧;当土壤湿度在塑性以下时,收缩引起土壤紧实的程度比一般人为的机械压力还更大,只有当湿度较大时,才有较高的总孔隙度。根据这些特性,提出水稻土秋耕适宜的土壤湿度是:以塑性下限为底限,以塑性中部为上限,对质地较轻的土壤,上下限宜酌量降低,但其上限不一定在塑性以下。适宜春耕的湿度比秋耕可大一些,因为晒垡和水中耕作,可再疏散土壤。

The West Tianmu Mountains, located in north-western Zhejiang Province, are among the National Nature Protection Areas in China.According to the data obtained from a number of field observations,soil chemical and physical analyses, clay differential thermal analyses, and X-ray diffraction pattern and microscope electron examinations, it has been found that the soils in this mountain area are of a distinct allitic character,the silica-alumina ratio approximating to 2. Among the clay minerals,kaolinite is dominant,...

The West Tianmu Mountains, located in north-western Zhejiang Province, are among the National Nature Protection Areas in China.According to the data obtained from a number of field observations,soil chemical and physical analyses, clay differential thermal analyses, and X-ray diffraction pattern and microscope electron examinations, it has been found that the soils in this mountain area are of a distinct allitic character,the silica-alumina ratio approximating to 2. Among the clay minerals,kaolinite is dominant, gibbsite being the second in importance. The soils show strong acid reaction, with a high content of active aluminuin. The soil morphological features conform to those of the Yellowish character.According to the soil features and the national conditions, they are considered to belong to the great soil group of the Mountain Yellow Earth.The soils from mountain top to the foot (the altitude of 1507 to 400M.above sea level), can again be divided into three main subgroups: Mountain Bleached-podzolied Yellow Earth, Mountain Surface Glei Yellow Earth and Yellow Earth.We got chances to make observation there twice respectively in the year of 1959 and of 1980. A comparison of the results shows that the forest ecological system there is in a state of dynamic equilibrium. The increase of forest biomass has led to the increase of residues, soilhumus and soil water capacity. The soil base contents are decreased by leaching water. As a result, the soil acidity is increased. The changes of soil property, in turn, have had some effect on the components and structures of the forest colonies.

根据野外调查和土壤理化分析、差热分析。X射线分析等资料,说明西天目山南坡土壤具明显富铝化特征,硅铝率2左右,粘土矿物以高岭石为主,并含较多三水铝矿,酸性强、活性铝含量较高,土壤剖面呈明显的黄化特征,故统属黄壤类土壤。从山顶到山麓又可续分为山地漂灰黄壤、山地表潜黄壤和山地黄壤等亚类。 从1959和1980年两次相距21年的观察和测定,说明西天目山森林生态系统处于缓慢的动平衡中。森林生物群落主组分生物量的增长,导致森林郁闭度、残落物和土壤蓄水量的增长,自然水不断对土壤进行盐基淋洗和酸化作用,而土壤的变化又反过来影响森林群落的组成和结构。

Pedosphere is an important component of the geospheric system. It is situated at the interface of the geospheric system, i.e., atmosphere, hydrosphere, biosphere and lithosphere and is the most active and vital sphere. The material cycling in pedosphere is an important portion on the research of the material cycling in global changes. Therefore, studies on pedosphere and on the structure and functions of the material cycling in pedosphere have a close relation to global changes, particularly to global soil changes....

Pedosphere is an important component of the geospheric system. It is situated at the interface of the geospheric system, i.e., atmosphere, hydrosphere, biosphere and lithosphere and is the most active and vital sphere. The material cycling in pedosphere is an important portion on the research of the material cycling in global changes. Therefore, studies on pedosphere and on the structure and functions of the material cycling in pedosphere have a close relation to global changes, particularly to global soil changes. The research scope and contents of pedosphere in global soil changes include material cycling in pedosphere and the other geospheres; temporal and spatial variations of water and soil resources; soil fertility changes and sustained agricultural development; regional rehabilitation and environmental construction etc.. They all are the themes of global soil changes and in particular of the global changes in China, and hence deserve our high attention.

土壤圈是地圈系统的重要组成部分,它处于地圈系统,即气圈、水圈、生物圈与岩石圈的交界面,是最活跃、最富生命力的圈层。土壤圈的物质循环是全球变化中物质循环的重要内容,因此,研究土壤圈及其物质循环的结构与功能,对全球变化,特别对全球土壤变化有密切关系。土壤圈在全球土壤变化中的研究内容包括:土壤圈与地圈各圈层的物质循环;水土资源的时空变化;土壤肥力变化与农业持续发展,区域治理与环境建设等,这些都是全球土壤变化,特别是中国全球变化的主题,应引起高度重视。

 
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