随着钻井活动导致地下水位下降，下层土壤正变得密实，就像失水的海绵一样。
As Wells are drilled and the water table drops, the underlying soil compacts, much like a dried-out sponge.
研究者们拼凑了包括头骨，手掌，脚掌，上臂，腿和骨盆在内的125块骨骼碎片，并采集挖掘处上层和下层的火山土壤层测定年代。
Researchers have pieced together 125 fragments of bone - including much of her skull, hands, feet, arms, legs and pelvis - which were dated using the volcanic layers of soil above and below the find.
—洛斯阿拉莫斯国家实验室的地质学者沃德·盖布·瑞尔采集化石挖掘地点上层和下层的火山土壤层分析测定其年代在440万年前。
Geologist Giday WoldeGabriel of Los Alamos National Laboratory was able to use volcanic layers above and below the fossil to date it to 4.4 million years ago.
表层土壤的总有机碳、活性碳、缓效性碳和惰效性碳含量都明显大于下层。
The contents of soil organic carbon, active carbon, slow carbon and resistant carbon is more in the surface soil than subsoil.
为了储存水，他们在土壤中挖出环状凹坑，吮食植物根茎，以便下层沙粒能够吸收降水。
To store water, they burrow in the soil in ring-like patterns and consume the roots of vegetation to allow underlying grains of sand to absorb falling rain.
对呈贡县14个村的蔬菜土壤上下层有机质含量和阳离子交换量进行调查分析。
The article investigates and analyzes the content of organic matter and cationic exchange of upper and under layer of soil planting vegetable of 14 villages in Chenggong county.
结果表明：在土层深厚、排水良好的淋溶褐土上，紫花苜蓿主根收缩，侧根发达，适应土壤上下层水分的变化。
The results shows that contracted taproot and developed lateral root of alfalfa adapted soil moisture changes on eluviated cinnamon soil which is great depth and drains well.
不同土壤层次氧化甲烷的潜力也有差异，表层土比下层土高。
Different soil layers had various potential of methane oxidation. The surface layers were higher than the low layers.
土壤物理性质总空间异质性程度和由空间自相关引起的异质性均为表层土壤高于下层。
The total and autocorrelation spatial heterogeneity of soil physical properties in top layer were greater than that in lower layer.
分别采制上述不同土壤类型或林型下的土壤表层和表下层的原状土祥，制取土壤薄片，进行土壤微形态学比较研究。
Undisturbed soils samples obtained from surface and subsurface soil layers under different forests were used to make thin sections and study micro-morphological characteristics.
结果表明：随着氮肥用量的提高，土壤剖面硝态氮累积量明显增加，其向土壤下层淋溶的程度也越严重；
The results show the amounts of NO3-N accumulation in the soil profiles and their extents to leach into the deeper soil layers are increased significantly as the nitrogen fertilizer usage increased.
结果表明：随着氮肥用量的提高，土壤剖面硝态氮累积量明显增加，其向土壤下层淋溶的程度也越严重；
The results show the amounts of NO3-N accumulation in the soil profiles and their extents to leach into the deeper soil layers are increased significantly as the nitrogen fertilizer usage increased.
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