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In addition, with the progress of runoff scouring, the form of soil erosion changed from sheet erosion to rill erosion.

李勇等(1991)和李勇(1995)通过对黄土高原地区乔灌植被根系与土壤物理性质关系的研究，证

In loess hilly-gully region covered by sheet sand,soil water erosion process is different from typical loess hilly-gully region because of worse natural environment and loose land surface material.

文摘：在片沙覆盖的黄土丘陵区，由于恶劣的自然环境及松散的地表组成物质，土壤的水蚀过程明显地不同于典型的黄土丘陵区。

Loess hilly region ; sheet flow ; soil erosion ; hydraulic parameter ; dynamic mechanism

黄土丘陵区；薄层水流；土壤侵蚀；水力参数；动力机制

Based on the problems of the change of erosion types on the slope, we used a new REE tracer method, by placing different rare earth elements of different soil depth across a slope in an indoor plot, simulated rainfall and INAA were applied to study sheet erosion changing to rill erosion on slope land.

提出并建立了一种新的利用REE元素研究坡面土壤侵蚀的方法根据坡面不同侵蚀方式演变过程定量分析存在问题，提出并建立了人为沿坡面垂直分层布设不同的REE示踪元素，利用室内人工模拟降雨试验和中子活化分析相结合的方法研究坡面侵蚀演变过程。

Soil erosion is widespread in the future should be strengthen the protection of grassland, afforestation, reduce the role of gully erosion and sheet erosion; should also note that the full utilization of water resources in the development of irrigated land, and substantial improvements in agricultural irrigation and drainage facilities to prevent flooding disasters.

水土流失现象普遍，今后应加强保护草坡，植树造林，减少沟蚀和片蚀作用；亦应注意水利资源的充分利用，发展水浇地，并大力改善农田排灌设施，防止水患灾害。

The main results were summarized as follows: 1 After forestland was destroyed into farmland, the main erosion type changed from sheet erosion to intensive rill and severe shallow gully erosion, accelerated soil erosion was severe and erosion intensity was hundreds to thousands times greater than those in the forestland prior to deforestation.

随着开垦年限的增加，单位降雨侵蚀力引起的侵蚀量呈加剧趋势。在植被破坏15年的裸露休闲地浅沟集水区，侵蚀蚀强度随坡长的增加而增加，且浅沟槽侵蚀量大于浅沟间，切沟沟槽侵蚀量大于切沟间。

The soil erosion process on the slope was clearly divided into sheet erosion stage, rill erosion developing stage and rill erosion stable stage. Before lOminutes of rainfalls, the percentage of sheet erosion amount to total erosion amount was more than 90%, and it indicated that sheet erosion happened on the slope. This percentage sharply decreased before SOminutes of rainfall time, on the other hand, the percentage of rill erosion amount to total erosion amount increased in curve form with rainfall time.

在降雨前10min左右，面蚀贡献率约占坡面侵蚀总量的90%以上，为面蚀阶段；随着降雨时间的延续，面蚀贡献率先急剧递减最后在第30min左右基本达到稳定，细沟侵蚀贡献率则出现相反趋势，此为细沟发育阶段；降雨后期，面蚀和细沟侵蚀贡献率的变化趋势逐渐变缓且基本达到稳定。

Estimated that 1/3 of all plastic sheeting becomes buried in soil.

估计有1/3的塑料碎片埋于土壤中。

In this study, methods of conventional culture, identifying fatty acid and PCR-DGGE were utilized to analyze soil microbial quantity, fatty acid and bacterial DNA segment in Tarim desert highway forest land, which can provide theoretical foundation for managing Tarim desert highway shelter-forest scientifically.

采用传统培养、脂肪酸鉴定和PCR-DGGE 3种方法分别研究了塔里木沙漠公路防护林地土壤微生物数量、脂肪酸种类和细菌DNA片段的多样性，从微生物学角度为塔里木沙漠公路防护林的管理提供理论依据。

Shigella baterium Amebiasis: These bacteria are found in polluted soil and water.

志贺氏菌属细菌阿米巴症：这些细菌发现，在受污染的土壤和水。

"Yes, now you can give yourself airs," she said, you have got what you wanted.

"对了，您现在高兴了，"她说道，这是您所期待的。

Then the LORD said to me: Rebel Israel is inwardly more just than traitorous Judah.

上主于是对我说：＂失节的以色列比失信的犹大，更显得正义。