土壤上层 meaning in Chinese
topsoil
Examples
- The organic acids produced in the upper horizons are soluble and mobile .
在土壤上层所产生的有机酸是水溶性的、流动性的。 - The nh4 + - n accumulated in the upper layer of soil when the irrigation water was low ; and at the high irrigation rate , this accumulation was decreased
灌水量低时，滴灌施肥铵态氮在土壤上层明显累积；灌水量增加后，这种累积作用减弱。 - Soil temperature decreases with depth increasing . the upper layer soil temperature rapidly rise or fell , while the under layer soil temperature slowly changed
地温值随深度增加而降低，土壤上层的温度急剧上升或下降，而土壤下层平稳递增或减小。 - However the soil moisture content was affected by the type of vegetation growing at different parts of the slope . i tried to account for this effect , by choosing sample points with similar types of vegetation . the distribution and type of native vegetation was highly related to soil moisture
不同植被类型立地土壤水分的剖面特征差异较大，天然植被的土壤水分梯度多为负， 0 ? 400cm土壤上层水分含量比下层高；对照裸坡地和苹果园的土壤水分梯度为正值。 - By the crop residue input , priming effects of soil irjcrobe will take place , and decomposition and bio - fixation give rise to soil organic matter arid m in the up layer of soil . on the other hand , tillage accelerate ; ; the organic matter mineralization and leads to the quantity of organic matter decreasing in . . or 10cm . layer which is about 1 / 2 of soil organic matter under no - tillage
覆盖免耕使土壤上层的有机质和氮素稳定增加，这主要来自被激发的微生物繁殖时对碳和氮的生物固定，而传统耕作则由于耕翻加速了有机物的矿化， 0 - 10cm土层微生物碳含量均一，其数值几乎为免耕系统的一半。