吴哥可能已经遭受过和现代相同的问题，包括滥伐森林，人口过剩，表土退化和侵蚀。
Angkor may have suffered problems common to modern times, including deforestation, overpopulation, topsoil degradation and erosion.
结果表明：人为加速侵蚀主要引起表土层细菌、放线菌、真菌数量减少，其中以真菌下降率最高。
The results show that man made accelerated erosion decreases the Numbers of bacteria, fungi and actinomyces, among which fungi was affected drastically.
侵蚀，服装以外的表土被风和雨，也有助于水污染。
Erosion, the wearing away of topsoil by wind and rain, also contributes to water pollution.
表土因土地开发、侵蚀和荒漠化而不断损失。
We lose topsoil to development, erosion and desertification.
1985年美国国会通过减耕和休耕等水土保持办法，确实减少表土的侵蚀，并控制基本农作物的再生产。
In 1985, Congress passed a Conservation Reserve Program to reduce soil erosion using practices such as conservation tillage and no-till.
研究土壤表土孔隙结构特征对于我国区域土壤的侵蚀防治、环境保护和减少地下水污染等问题均具有重要意义。
To research the properties of pore structure in soil has great practical significance in preventing and curing soil erosion, environment protection, reducing pollution of ground water and so on.
研究土壤表土孔隙结构特征对于我国区域土壤的侵蚀防治、环境保护和减少地下水污染等问题均具有重要意义。
To research the properties of pore structure in soil has great practical significance in preventing and curing soil erosion, environment protection, reducing pollution of ground water and so on.
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