这意味着表层土壤几只含有少量长期成功耕作所必需的成分。
This means topsoil contains few of the ingredients needed for long-term successful farming.
一旦扎根土壤，灌木林地就会生长茂盛，特别是在北极地区，因为北极地区的灌木丛比其他植物更善于利用土壤中的营养成分。
Once is established, shrubland thrives, particularly in the Arctic, because Arctic shrubs are good at taking advantage of increased nutrients in the soil, better than other Arctic plants.
肥料供给土壤所缺乏的成分。
生态学研究的是整体；生物学研究的是这个整体里的有机成分，这些有机成分并不比空气、水和土壤更重要。
Ecology studies the whole; biology studies the organic constituents of the whole that are no more important than air, water and soil.
中情局有化工厂的土壤样品，在里面发现了制造VX神经毒气的化学成分。
The CIA had soil samples taken at the plant site that contained the chemical used to produce VX.
土壤中不但含有水分，还有大量其他的成分和物质，例如汞、钙、镁、一氧化碳、二氧化碳、氨和钠——以及少量的银。
Not only did it contain water, but a plethora of other compounds and elements including mercury, calcium, magnesium, carbon monoxide and dioxide, ammonia, sodium - and small traces of silver.
在许多地区，化肥与农药的过度使用已经造成土壤营养成分流失、过度酸化，而且污染了河流与湖水。
Overuse of fertilizer and pesticides has in many areas stripped the soil of nutrients or made it too acidic, as well as contributing to river and lake pollution.
理论上，大气中二氧化碳含量增多会使作物生长加快，实际上，还要看土壤中所含氮成分的多少。
In theory extra carbon dioxide in the atmosphere should help plants grow faster, though whether this actually happens may also depend on the amount of nitrogen in the soil.
有机碳是保持土壤健康的重要成分，同时也影响着大气中的二氧化碳浓度。
Organic carbon is an important component of soil health and also influences atmospheric carbon dioxide levels.
有机的土壤成分没有潜在的有害杀虫剂。
Organic ingredients grown in soil WITHOUT potentially harmful pesticides.
土季节冻结和融化的影响因素主要有雪盖、植被、土壤成分及含水量、地表状况和地形等。
The factors that can influence the soil seasonal free zing and thawing include snow -cover, vegetation, the soil component and contain water, the condition of earth, landform and so on.
树叶和细枝具有更多的营养成分，若将它们留在森林，可使土壤恢复元气。
Leaves and twigs have high concentration of nutrients that, if left In the forest, revitalize the soil.
利用主成分和逐步回归分析了影响土壤重金属的有效性及其微生物学效应的因素。
Principal component analysis and stepwise regression were employed to characterize availability of heavy metals, microbial responses and their effect factors in the studied soil.
土壤结构、成分、微量元素含量影响水的质量。
The soil structure, composition and content of trace elements affected the quality of the water in these areas.
土壤酶活性以及微生物数量的提高通过促进养分循环过程间接对果实营养成分和产量产生积极的影响。
The increase of soil enzyme activity and microorganism amount indirectly bring positive effects on fruit quality and yield by promoting nutrition circulation courses.
该地区的土壤退化主要表现为营养成分的减少，有害的盐碱成份的增加。
Soil degradation in this region mainly expressed decrease of nutrition element and increase of salt and alkali.
土壤有机物质的活性成分是对土壤养分、植物生长乃至环境、大气和人类有影响的有效物质。
It is considered that active soil organic matter had influence on soil nutrient, plant growth, environment, atmosphere and human kind.
通过破坏土壤中营养成分的输送，重金属也威胁着森林的成长。
Heavy metals also threaten the growth of forests by disrupting the supply of nutrients in the soil.
第一主成分综合反映了区内土壤盐渍化程度，第二和第三主成分联合反映了土壤的碱性特征。
The first principal component can denote the degree of soil salinity, and the second and third principal component can denote the degree of soil alkalinity.
土壤温度、微生物数量和枯枝落叶本身的化学成分是影响分解率的主要因素。
The soil temperature, the Numbers of microorganism and the chemical composition of litter itself are the main factors what affect the litter decomposition rate.
岩石与土壤的不均匀性质有碍于记录脉冲中很高的频率成分。
The heterogeneous nature of rock and soil would prohibit recording the very high-frequency components present in the pulses.
土壤浸提液浓缩过程中物质成分变化的研究，认识玉米残体培肥土壤的机制也有重要意义。
The study on the constitute change of the concentration of soil water extract had great significance to research on the soil mechanism of fertilizing undecomposed corn.
在中国未来的月球探测计划中，可能获取的月球表层数据包括地形、地貌、岩层、土壤、资源、环境以及各种相关的结构、物质成分数据。
Lunar exploration of China will acquire data of the lunar surface, including landform, physiognomy, strata, soil of the moon, resources, environment and the related structures and components.
模拟实验证实土壤中存在的游离硅是硅酸盐矿物异成分溶解的结果。
A simulating experiment on soil weathering showed that the free silicon comes from dissolution of silicate.
以大兴安岭北部地区为例，研究了浅覆盖区土壤与基岩化学成分的关系。
Taking the northern Da Hinggan Mountains for example, the relation between the chemical compositions of soils and bedrocks in shallow overburden areas is studied.
碳水化合物是土壤有机质的重要组成成分，其含量和特性对土壤性质有很大的影响。
Soil carbohydrates constitute a significant part of the soil organic matter and the quality and quantity of carbohydrates in soils can influence the quality of soil.
碳水化合物是土壤有机质的重要组成成分，其含量和特性对土壤性质有很大的影响。
Soil carbohydrates constitute a significant part of the soil organic matter and the quality and quantity of carbohydrates in soils can influence the quality of soil.
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