表土层

As well,in the soil s (0～20 cm)coacervate constitution,the large soil types concent increased,the little soil types concent decreased and the specific surface dro.

经生物、化学改良后，0～ 2 0cm土层土壤微结构中大粒级颗粒含量增加，小粒级颗粒含量减少，土壤比表面值降低；土壤持水力降低，但有效水含量和比水容量增加，土壤供水能力增强。

As well,in the soil's (0～20 cm)coacervate constitution,the large soil types concent increased,the little soil types concent decreased and the specific surface drooped;furthermore,the water-redention capacities of soil drooped,but the available water content and the specific water capacitiesincreased,the water-supply ability strengthened.

经生物、化学改良后，0～20 cm土层土壤微结构中大粒级颗粒含量增加，小粒级颗粒含量减少，土壤比表面值降低；土壤持水力降低，但有效水含量和比水容量增加，土壤供水能力增强。

The results show that:①The forest soils have the stronger nitrification, but also the nitrification in surface horizon is stronger than the undersoil's.

结果表明：①森林土壤有较强的硝化活性，且表土层比底层土强，同时根际土利于硝化作用进行，根际效应R/S在4.5左右；②淹水厌气培养24h，-N的消失率为52%～58%，占第10天的55%～71%，且表土层-N的消失率比底层土大；③参与同化反硝化作用的还原酶活性较强，在培养24h后，被还原的基质数量占加入基质数量的70%～90%。

The large-scale soil animal sorts were gathered by hand, while the medium and the small soil animals were separated by the funnel law and the funnel law, totally 314 soil animals were caught, which subordinated separately in the mollusk gate ,the annulate gate and 3 phyla 4 class 12 order results showed that the ball tail phyla and the hymenoptera prospect, tubing up 57.54% of the total phyla ,are the dominant class groups and main part of soil animals in this area; The hymenoptera ant class, the coleoptera larva, the arachnids, man kind of, the gastropoda is the common class group the hymenoptera are the common class groups .these result indicate that the community multiple of soil animal's degreases progressively basically among different soil strata sing soil depth and has an obvious aggregation .

结果表明：弹尾目和鞘翅目成虫为优势类群，占全捕量的57.54%，是该区土壤动物的主体。膜翅目蚁类、鞘翅目幼虫、蜘蛛类、螨类、腹足类等为常见类群。上述结果显示土壤动物群落的多样性在不同土层中基本上是随土层深度的增加而递减，并且表聚性明显。关键词：枣园；土壤动物；群落多样性；陕西榆林

With 3 crops a year, continuous production for three years, will carry 18cm surficial soil, which will severely destroy the structure of the soil.

如果以每年生产三茬计算，连续生产三年，草坪卷就要带走18cm以上的表土层，对土壤结构有极大的破坏性。

Macalla sp. has four generations a year in Shantou of Guangdong Province and the generations overlap. It overwinters as mature larva in the soil at a depth of 1-3 cm under tree crown or in fallen leaves from October to December.

橄榄锄须丛螟在广东汕头1a4代，林间世代重叠现象严重。10月中旬至12月中旬，老熟幼虫陆续下树入土在表土层1~3cm处或枯枝落叶层结茧越冬。

Because zircons are 8-10 feet below the surface of the earth under the earth, and in addition to local deposits located below the horizon, so that when water is often flooded mines.

因为锆石大多位于表土层下8-10英尺下，且当地的矿床又多位于水平线以下，因此开采时水经常会淹没矿坑。

At the same time, the rhizosphere is favourable to the nitrification, the rhizosphere effect R/S is about 4.5;②The loss rate of -N in 24 h in flooded and anaerobic incubation is 52%?

58％，占第10天的55％？71％，且表土层-N的消失率比底层土大；③参与同化反硝化作用的还原酶活性较强，在培养24h后，被还原的基质数量占加入基质数量的70％？

The RENI is positively correlated with wet biomass of the above ground level stem ,branch and plant leaves and with the species richness Of the phyto—Community.

研究结果表明，根系生态位垂直空间分布大多数为典型的表层聚积型，表土层O～20cm根系生态位指数明显高于其它层次。

The wonderful loess lands, which cover much of Kansu, Shensi, Ninghsia, and Shansi provinces, account for the marvelous fertility of these regions, for the loess furnishes an inexhaustible porous topsoil tens of feet deep.

这一令人惊叹的黄土地带，广及甘肃、西、夏、西四省的大部分地区，雨量充分的时候异常肥沃，因为这种黄土提供了无穷无尽的、几十英尺深的多孔表土层。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失