Once the humus layer disappears, nutrients cannot be recycled and leach from the soil, converting soil from fertile to infertile and making it suitable only for savanna vegetation.
一旦腐殖质层消失，养分就无法从土壤中回收和过滤，致使土壤由肥沃变为贫瘠，只适于热带草原植被的生长。
Humus is classified according to how well it is incorporated into the mineral soil, the types of organisms involved in its decomposition, and the vegetation from which it is derived.
根据腐殖质与矿物质土壤的结合程度、分解作用中所含的有机物类型以及原有的植被，腐殖质可区分为几个类型。
Cover crop: a crop such as winter rye or clover planted between periods of regular crop production to prevent soil erosion and provide humus or nitrogen.
间作在常规农作物生长间期内种植的农作物，比如冬麦或三叶草，以预防土壤侵蚀并能提供腐殖质和氮。
Earthworms consume large amounts of soil, and produce a rich humus, perfect in texture.
蚯蚓吃下大量土壤，排出肥力丰富、物理结构理想的腐殖质。
The lack of humus and the excessive leaching make this soil almost useless for agricultural purpose.
缺少腐殖质和过度淋滤使这种土壤对农业几乎无用。
Deep mixing method for soft soil is ineffective while humus content is above a certain value, thus additives should be mixed into cemented soil to eliminate the influence.
深层搅拌法在加固含有腐殖酸的软土时失去了效用，需要添加促进剂来消除腐殖酸的影响。
A crop, such as winter rye or clover, planted between periods of regular crop production to prevent soil erosion and provide humus or nitrogen.
在常规农作物生长间期内种植的农作物，比如冬麦或三叶草，以预防土壤侵蚀并能提供腐殖质和氮。
Loose, friable soil, rich in humus and fit for planting.
疏松，易碎的土壤，富含腐殖质并适宜种植。
The paper points out that the factors which influence the bark quantity are soil quality, the position and the shape of the slope, the depth of humus soil, and the content of organic matter.
影响黑荆树皮量主导立地因子有土壤质地、坡位、黑土层厚度、坡形、土壤有机质含量。
During the process the organic materials will be turned to the stable humus, which can be used as fertilizer and amend for the plant soil.
在这种堆肥化过程中，有机物由不稳定状态转化为稳定的腐殖质物质，用作肥料和改良土壤。
This paper studied the effects of different crop stubbles put in soil on soil humus by cultural experiment of churnozem.
通过黑钙土的培养试验，研究了不同作物根茬施入土壤后对土壤腐殖质的影响。
Because of the distinction of soil property and humus content, soil water content is not ideal to indicate whether it is suitable to the growth of plant.
由于土壤性质和腐殖质含量的不同，土壤的含水量并不能很好地说明是否适宜植物的生长。
The content of methyl functional group of humus is an important index to evaluate the humification of soil.
胡敏酸甲氧基功能团的含量多寡是衡量土壤腐殖质化的重要指标。
The experiment was carried out to evaluate effects of covering wheat straw in apple orchard and apricot orchard on soil humus composition, microflora and soil enzyme activities.
在杏园和苹果园覆盖麦草，研究其对土壤腐殖质组成、微生物区系及土壤酶活性变化的影响。
The variation of composition and nature of every soil type humus vertical distribution is obvious.
各土类腐殖质组成性质垂直变化明显。
The results showed that long term fertilization affected not only the content and composition of soil humus, but also the physicochemical property of the soil humus.
结果表明，长期施肥不仅影响土壤腐殖质的含量与组成，还影响腐殖质的理化性质。
There are few studies on the effect of crop root systems on the composition, particularly on the heavy fraction of soil humus.
本文对黑钙土、黑土中各种作物根茬留茬与否对土壤腐殖质、土壤重组有机质的组成、结合形态及某些光学性质进行了测定。
The soil under the humus is not dark. This lighter soil is rather like sand; it is made of bits of rock.
而腐殖土下面的土壤却不是黑色的，这种浅色的土壤很像沙子，它是由碎石变成的。
The major factors of the soil developed from arenite were soil-layer depth, non-capillary porosity and humus depth.
砂岩发育的土壤主导因子是土层厚度、非毛管孔隙度和腐殖质层厚度。
Humus: Nonliving, finely divided organic matter in soil, derived from microbial decomposition of plant and animal substances.
腐殖质：土壤中无生命的、细小的有机物质。
There is a relationship on soil polyphenol oxidase betweenforming of soil organic matter and medium of forming humus.
土壤多酚氧化酶与土壤有机质的形成有关，是腐殖化的一种媒介。
For soil trace element, the ageing humus had fixed effect. The nascent active humus had effect to promote the activity.
对土壤微量元素，老化的腐殖质有固定作用，新生的活性腐殖质有促进活性作用。
It was also showed in a soil organic amendment experiment that there was no response to increment of organic matter when soil contained humus more than 4%.
有机培肥试验中，大于土壤腐殖质4%的有机质增量，不表现产量效应。
Land reclamation technology includes surface humus soil stripping and piling, blocks the dregs dam. retaining dam, flood drainage guide, land leveling and backfilling of soil humus.
土地复垦技术措施包括表层腐殖质土的剥离与堆放、拦渣坝、挡土坝、导洪排水、土地平整与腐殖质土回填等；
It would be important to increase soil humus content to alleviate the pollution and enhance the soil self-purification.
提高土壤腐殖质含量是减轻污染危害及增强土壤自净能力的重要措施。
The results indicated that humus application inhibited soil Hg to shift to the plants, Hg fixation rate by the humus being over 90%.
结果表明：腐殖酸的施用可抑制土壤汞向植株迁移，对土壤汞的最大固定率超过90 % ；
Humus layer in different forest types and soil surface type and quantity of soil fungal communities have a significant difference.
不同林型腐殖质层和土壤表层的土壤真菌群落种类和数量都具存在显著差异。
The soil under the humus is not dark. This lighter soil is rather like sand; it is made of bit of rock.
腐殖上下面的土壤并不黑，这种浅色土壤很像沙子，它是由碎石变成的。
The soil under the humus is not dark. This lighter soil is rather like sand; it is made of bit of rock.
腐殖上下面的土壤并不黑，这种浅色土壤很像沙子，它是由碎石变成的。
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