topsoil ['tɔpsɔil]

topsoil的基本解释

n.

表层土, 上层土

与topsoil相关的网络例句 [注：此内容来源于网络，仅供参考]

The results show that 42.86% topsoil samples are polluted by Cadmium, soil synthesis pollution index is moderate, Cadmium pollution degree of topsoil correlate with the environment of sampling sites. The results also show that exchangeable Cd, carbonate-bound Cd, organic-bound Cd and residual Cd are found in all soil samples except for Fe-Mn oxide-bound Cd. Furthermore, the concentration of exchangeable Cd and carbonate-bound Cd, both which have high biological validity, is high. Humus has a certain correlation with exchangeable Cd, organic-bound Cd and residual Cd, and has no obvious correlation with other chemical speciations. Any chemical speciation of Cd has no obvious correlation with pH and total Fe of soil samples. Cadmium in topsoil can be eluviated by acid solution, the quantity of Cadmium eluviated by redistilled water is little. With the rise of pH of eluviating solution, eluviated Cadmium quantity decrease. For the same soil sample, the lower pH value of eluviating solution is, the more fast the Cadmium is eluviated, and the more thequantity of Cadmium is eluviated.

研究结果表明：成都市表生土壤样中有42.86%受镉污染，镉综合污染水平达中度污染，成都市表生土壤镉污染程度与采样点周围环境表现出一定的相关性；除铁锰氧化物结合态镉在部分土壤样中未检出外，所有土壤样均含有可交换态镉、碳酸盐结合态镉、有机结合态镉、残留态镉，且生物有效性较高的可交换态镉和碳酸盐结合态镉占总镉量比例较高；成都市表生土壤中的腐殖质与可交换态镉、有机结合态镉、残留态镉有一定相关性，与碳酸盐结合态镉、铁锰氧化物结合态镉相关性不显著；各形态镉与土壤pH值和全铁的相关性均不显著；土壤中的镉可被酸溶液淋出，重蒸馏水淋出镉量十分微小；随着淋滤液pH值的升高，土壤样的镉淋出量下降，且0～5小时时段的镉淋出量占镉总淋出量比例下降，5～30小时时段的镉淋出量占镉总淋出量的比例上升，对同一土壤样而言，酸度大的淋滤液比酸度小的淋滤液淋出镉速度更快，淋出镉量更大。

Environmental chemical action of Cadmium in topsoil in Chengdu has been studied in this paper, including the Cadmium pollution survey of topsoil in Chengdu, the chemical speciation research of Cadmium in topsoil, the research of correlation between soil character and chemical speciation of Cadmium and eluviating experiment research.

本文针对成都市表生土壤中镉的环境化学行为进行研究，包括以下研究内容：成都市表生土壤的镉污染状况调查；表生土壤中镉的化学形态研究；土壤性状同土壤镉赋存形态的关系研究；土壤淋滤实验研究。

Cm.℃.min-1,0.344 J.-1 and 0.311 J.-1.The average thermal diffusivity is 0.244～0.247cm2.min-1.By pressing soil and using lichen coat,the reforesting technique of catchment can lighten the bad effect of nudity soil,and can lower down average topsoil temperature by 0.2～1.5 ℃, maximum topsoil temperature by 2.7～4.0 ℃, topsoil temperature amplitude by 2.5～3.7 ℃, and depress 11%～25%soil thermal flux and 4%～15%soil evaporation.

拍光压实后喷涂引植地衣、苔藓，可有效缓解地表裸露后产生的负影响，在生长季可降低表层均温0.2～1.5 ℃，降低最高表层土温2.7～4.0℃，降低表层土温日较差2.5～3.7 ℃，降低土壤热通量11％～25％，有效降低土壤蒸发4％～15％。

与topsoil相关的网络解释 [注：此内容来源于网络，仅供参考]

topsoil：表土

每年全球的表土(Topsoil)丧失0.7%,到了下一个世纪,恐怕我们的子孙不会知道什么是泥土了. 人又用尽方法去施放化学肥料,以补救表土的流失,这却增加环境污染,结果收成减少,河流内的生物遭大屠杀. 按照圣经的指示,以色列人有权利拥有迦南地的地土,

topsoil：表土层

arid and semi-arid areas 干旱和半干旱地区 | topsoil 表土层 | high temperature 高温

topsoil：表土; 耕层

topographic pattern 地形图形; 地形类型 | topsoil 表土; 耕层 | Toronto Conference 多伦多会议

topsoil：土层

topography 地形 | topsoil 土层 | torbanite 深褐色烛煤

imported topsoil：外来表土

imported subsoil 外来底土 | imported topsoil 外来表土 | imposed load 外加荷载;附加荷载