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土壤变化
相关语句
  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。
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    Study on effects of pinus elliottii stands on soil
    湿地松林分土壤变化研究
短句来源
    Soils under phyllostachy pubescens stand had a lower (P<0.05) proportion of MBC than under broad-leaved, masson pine and Chinese fir.
    土壤水溶性有机碳含量的季节动态变化3种林分变化趋势基本一致,表现为冷季高而暖季低,马尾松林土壤变化相对较大,衫木林、阔叶林变化幅度较小,3种林分下土壤WSOC的季节变幅大于EOCI。
短句来源
    The organic matter content as well as the total and available contents of nutrients increased at the first 2~5 years,and then declined rapidly,especially for those in topsoils.
    土壤有机质含量、全量养分含量和速效养分含量均在采伐初期 2~ 5年增加 ,随后又迅速减少 ,尤其是表层土壤变化更为明显 ;
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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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Soil fertility of the plantations of Paramichelia baillonii, Betula alnoides, Acacia Mangium and Altingia excelsa in tropical area of Yunnan does not decline rapidly, and the physical and chemical properties of forestland are not affected greatly if the plantations can be managed properly. 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.

在云南热区营造山桂花、西南桦、马尖相思、高阿丁枫等4种人工林,只要经营得当,对林地土壤理化性质并不造成重大影响,不会引起地力迅速衰退。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。

A comparative study was made to analyze the dynamics of soil nutrient contents in different cutting forestlands of broad-leaved Korean pine forest on Changbai Mountains.The results showed that soil nutrient contents in different forestlands with different cutting times had obvious differences.With the cutting time going on after logging,soil pH value had the trend of declining firstly and increasing afterwards.The acidity of the topsoil was the highest after cutting for five years,and that of 10~20 cm soil layer...

A comparative study was made to analyze the dynamics of soil nutrient contents in different cutting forestlands of broad-leaved Korean pine forest on Changbai Mountains.The results showed that soil nutrient contents in different forestlands with different cutting times had obvious differences.With the cutting time going on after logging,soil pH value had the trend of declining firstly and increasing afterwards.The acidity of the topsoil was the highest after cutting for five years,and that of 10~20 cm soil layer was the strongest after cutting for ten years.The organic matter content as well as the total and available contents of nutrients increased at the first 2~5 years,and then declined rapidly,especially for those in topsoils.The cation exchange capacity (CEC),exchangeable Ca and exchangeable Mg had the same trend.Therefore,after forest cutting,artificial planting and regeneration should be carried out in time to resume the vegetation to reduce and prevent soil nutrient loss.

采用对比实验 ,对不同采伐年限的长白山阔叶红松林采伐迹地土壤养分含量变化进行了分析与研究 .结果表明 ,不同采伐年限的采伐迹地土壤养分含量差异很大 .林地土壤 pH值随着伐后时间的推移而出现一个先下降后上升的过程 ,表层土壤在伐后 5年的酸性最强 ,10~ 2 0cm层土壤在伐后 10年酸性最强 ;土壤有机质含量、全量养分含量和速效养分含量均在采伐初期 2~ 5年增加 ,随后又迅速减少 ,尤其是表层土壤变化更为明显 ;土壤阳离子交换量 (CEC)及交换性Ca、Mg也都表现出相同的变化趋势 .因此 ,森林采伐后应及时人工造林、更新进行植被恢复 ,可将养分固定而减少和防止土壤养分的流失 .

Evaluation of the relationship between forest changes and streamflow has an important role in forest planning and water resource management.Although numerous studies on the subject have been conducted in various countries over the last century,controversies still exist.This is mainly due to the complexities of the relationship and the variations between the studied forest ecosystems.This paper examines both consistence and complexity of the forest-streamflow relations by reviewing the topics including the impacts...

Evaluation of the relationship between forest changes and streamflow has an important role in forest planning and water resource management.Although numerous studies on the subject have been conducted in various countries over the last century,controversies still exist.This is mainly due to the complexities of the relationship and the variations between the studied forest ecosystems.This paper examines both consistence and complexity of the forest-streamflow relations by reviewing the topics including the impacts of forest changes on streamflow,harvesting thresholds and hydrological recovery.The literatures used for this review are all from the paired watershed experiments.Our review shows that a consistent or predictable relationship generally exists when examining annual mean flow.The majority of the paired watershed studies demon-strated that harvesting increases annual mean flow,and reforestation from open land decreases it. The relationship between forest change and the short-duration hydrological variables such as peak and low flows appears more complex and less predictable.This is because many factors including changes in forest vegetation,soil condition,harvesting location,etc.interactively affect peak and low flows.Application of various definitions and analytical methods in streamflow also contributes to the complexities.We further conclude that a systematic approach considering interactions between streamflow and other processes or components(e.g.forest vegetation,soil and climate)is needed for understanding the forest-streamflow relation.The paired watershed approach is generally thought as a reliable method.However,it may offer limited use in evaluating complexity of the forest-streamflow relation if the paired watersheds are treated as the"black boxes".We suggest that combination of the paired watersheds with other process-related approaches should be used for studying the relationship between forest changes and streamflow in the future.

@论文综述国外近一个世纪以来在配对集水区研究方面所取得的结论,从水的自然属性出发,从森林变化对径流(年径流量、洪峰与枯水径流)的影响,径流响应的干扰临界值及水文恢复各方面探讨森林变化与径流关系的一致性与复杂性。森林变化与径流关系的一致性主要表现在由较长时间尺度表达的年径流量上。绝大多数的配对集水区的试验研究表明,采伐森林就会增加年径流量,而在荒地上造林就会减少年径流量。而由较短时间尺度表达的洪峰径流与枯水流量则呈现较大的复杂性和难预估性。综述表明,对径流特别是洪峰与枯水径流的定义及分析方法的不同也是造成森林与径流关系复杂性的重要原因。森林与径流关系的复杂性要求人们在研究及应用其关系时就必须有系统观,必须考虑植被、径流与其它过程(土壤变化、气候变化等)的相互作用。论文还认为尽管配对集水区试验作为一种研究方法为研究者提供了许多可靠的结论,但由于许多研究者只把集水区看作是“黑箱”Q从而对认识森林与径流关系的复杂性有一定的局限性。未来的研究应把配对集水区的试验与其它对过程的研究技术(同位素、GIS等技术)结合起来。

 
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