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评价土壤肥力
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  assessing soil fertility
     Soil organic matter (SOM) in farmland is an important index of assessing soil fertility and soil quality of the farmland and also an integral component of the globe carbon stock. Therefore, dynamic of SOM has an important influence on global climate change.
     农田土壤有机质是评价土壤肥力和土壤质量的重要指标,同时也是全球C库的重要组成部分,其时空变化动态对土壤质量和全球气候变化有重要影响。
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     Used main elements analyticalmethods to analyze six samples for 850 farm, soil fertility evaluation rankings: 3, 4, 6, 1, 2, 5.(5)Soil variability has been studied by routine statistics method and spatial analysis method.
     应用主成分分析法对850农场参评的6个样本进行评价,土壤肥力综合评价排名为:“3,4,6,1,2,5”(1-6代表样本编号)。
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     We suggest that soil enzymes activaty is the in-dex to evaluate activaties of soil-biology and soil effective fertility.
     由此可见,用土壤酶活性来表征土壤生物学活性和土壤有效肥力状况,并根据酶活性评价土壤肥力水平指标是可行的.
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     2. Soil bulk density、organic matter content、total nitrogen had a good correlation coefficient with other nutrient activities.
     (2)对土壤肥力因子进行的相关分析表明,土壤容重、有机质含量、水解氮含量与各种土壤养分指标有较高的相关系数,故在一定条件下,可作为评价土壤肥力的主要指标。
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     The correlation among soil microorganism quantity,enzyme activity and soil nutrient content was significant which can be used as evaluation index of soil fertility.
     土壤微生物数量、酶活性与土壤养分含量之间呈显著相关关系,可作为评价土壤肥力的指标。
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     The activities of enzymes of soil can be used to evaluate the soil fertility because soil enzymes have important actions in transformation of organic carbon, N and P in soil.
     土壤酶的活性可以作为评价土壤肥力的重要指标,土壤酶对土壤中有机碳,N、P的转化起着重要的作用。
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  相似匹配句对
     soil fertility;
     土壤肥力
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     3 The integrated evaluation of soil fertilityPrincipal component and gray theory analysis showed that soil fertility sampled form twenty-four sunlight greenhouses could plot four ranks.
     3、土壤肥力的综合评价
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     Preliminary studies on the integrated evaluation of soil nutrient fertility
     土壤肥力综合评价初步研究
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     Evaluation and analysis on Chuangye farm's soil fertility
     创业农场农田土壤肥力评价
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     Research on evaluation norm and method of soil fertility
     论土壤肥力评价指标和方法
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This paper deals with the relationship between soils and mean annual Increment single poplar tree in the vast plain of eastern China. According to the climate, the geomorphy, the parent materials, and the groundwater level, soils of this region may be divided into ten types. The sequence of their fertility is as follows: grey fluvo-aquic soil, red clayed fluvo-aquic soil, loamy fluvo-aquic soil, fluvo-aquic cinnamon soil, desaline fluvo-aquic soil, carbonate cinnamon soil, shajiang black soil, saline fluvo-aquic,...

This paper deals with the relationship between soils and mean annual Increment single poplar tree in the vast plain of eastern China. According to the climate, the geomorphy, the parent materials, and the groundwater level, soils of this region may be divided into ten types. The sequence of their fertility is as follows: grey fluvo-aquic soil, red clayed fluvo-aquic soil, loamy fluvo-aquic soil, fluvo-aquic cinnamon soil, desaline fluvo-aquic soil, carbonate cinnamon soil, shajiang black soil, saline fluvo-aquic, sandy fluvo-aquic soil and solonchak. Compared with the forest soil in mountainous region, the organic matter content and total nitrogen content in all plain soils are poor. Except soil available potassium, most plain soils are also poor in available nitrogen and especially available phosphate. Both in the soil or in the ground water all over the plain the calcium is very abundant, it suits poplar-calciphile very well. The datum of mean annual increment of 16 poplar clones and 3 other broad-leaved tree species in different soils have been given in this paper. According to the results of the former study, it is proved that each poplar species has its own suitable site.

作者对黄淮海及长江中游平原境内水热条件与地貌成因不同的6个平原单元进行了重点考察,并对林木生长有关的11种土壤进行了野外调查与土壤理化分析,按养分含量与障碍因子综合评价了土壤肥力与宜林特性;应用带状和块状样地调查法,测定各类土壤上多个样地内标准木的树高、胸径和单株材积年平均生长量,再求算各类土壤上的平均值。土壤与林木生长关系的对比研究表明,不同杨树品种和无性系以及其他树种,在其适生的土壤上可获得较高的生长量,这有助于该地区正确选择宜林树种和合理地进行良种推广工作,做到因地适树,提高平原造林质量。

In this paper the soil considered as an open irreversible nonequilibrium systems, substances may be added or removed from it,that might be necessary to have energy flowing through the systems during substances conversion process is occured.The concept of entropy produced in systems which is the site of these irreversible processes plays an important role in nonequilibrium thermodynamics.However, the dissipative fraction of the energy during per unit substance conversion in fertility processes may be recognized...

In this paper the soil considered as an open irreversible nonequilibrium systems, substances may be added or removed from it,that might be necessary to have energy flowing through the systems during substances conversion process is occured.The concept of entropy produced in systems which is the site of these irreversible processes plays an important role in nonequilibrium thermodynamics.However, the dissipative fraction of the energy during per unit substance conversion in fertility processes may be recognized as the entropy of the soil systems.Consider,for example, organic matter or humus is an important energy source material in the soil and the nitrogen content in it which varies in a given range is the characteristic property of the energy soarce material.Decomposition of a given material would result in mineralization of a given available nitrogen content which is absorbed by green plants to formed a given crop yield, in humus decomposition processes, energy released, we may look this process as the energy flowing through the systems.A fraction of the total energy is supposedly available for converting to useful work it should be noted that it is the free energy which forms the energy amount of the crop yield, another fraction of the total energy would become a state of dissipation which was dissipaed by "friction".If the total energy comes from the organic matter decompostion minus the free energy that forms the crop yield energy, then it is divided by the released available nitrogen content per unit area, the result of this caculation may be recognized as the iutial entropy of he soil systems. As the chemical nitrgen fertilizer was added into the soil systems, the soil systems state would be changed and would produce a change in entropy.we could caculate the change of the entropy.The total entropy of the whole systems may be defined as the sum of the intial entropy and the change of the entropy,it is a complex index which measure the degree of order or the fertility of the soil systems.The high yield of soils and the the high chemical fertilizer conversion rate leads to a decrease of soil systems entropy.

本文根据耗散结构理论提出表征土壤肥力的土壤系统熵的概念,其定义是土壤系统中单位物质转化过程中的势能耗损。对应Schrodinger的负熵理论,土壤系统熵越低,土壤肥力越高。土壤系统熵可分为两部分,一是表征土壤基础肥力的,命名为起始熵(S_0)。另一是表征土壤人工肥力的,指因化学氮素投入所引起系统状态的变化,称为熵变(S_1),土壤系统熵(S_E)是两部分之和:S_E=S_0+S_1是土壤生产力和系统转换效率的综合指标。土壤系统熵值有稳定性,可作为土壤分类的依据。因为熵值计算排除了空间条件和不同作物种类与其它偶然因素对评价土壤肥力的影响,因而可供比较应用。土壤系统熵既反映了系统的结构状态,也反映了输入能量的可用程度,因此是土壤做为一个耗散结构的基本性质指标,从而实现了土壤肥力评价中的生态效率和经济效益的结合,并且为系统论土壤学的研究对象提供了认识的基础。土壤系统熵和土壤信息量有同等意义,是对土壤系统进行最优化反馈控制的依据。文中列举了土壤系统熵的计算方法,并讨论了它的实际应用。

The present report discussed the ecological reaction and adaptabilities of seedlings of nineteen tree species grown on several purplish soils with different properties and fertilities.The significance of growth difference of seedlings in different soil conditions was explained by using variance analysis method.Ana using cluster analysis method,the author revealed the ecological similarities of different tree species.Based on the relative heights of the seedlings the soil fertilities were evaluated.

本文讨论了19种树苗在几种不同性质和肥力水平紫色土上的生态反应和适应性,利用方差分析的方法阐明了不同土壤条件幼苗生长差异的显著性,利用簇群分析揭示了不同树种的生态相似性,根据幼苗的相对高度评价了土壤的肥力。

 
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