There are many factors that cause artificial soil erosion , such as urban construction , development of agriculture and forestry , traffic construction and energy resource development 产生人为水土流失的主要因素有城镇建设、农林开发类工程建设、交通建设、资源开发等。
Drought resistance and photosynthesis of two species of ceratoides under the condition of artificial soil desiccation were studied based on some indexes of water and photosynthesis 摘要用盆栽控水的方法模拟土壤干旱条件,从水分生理和光合作用方面对两种驼绒藜属植物的抗旱生理进行研究。
Based on the structure and engineering properties , combined with the distribution rule of net foundation stress , it could better reinforce artificial soil with gravel pile and dynamic compaction 摘要根据湖区填土的层次结构和工程特性,结合地基土中附加应力的分布规律,采用碎石桩强夯联合法能起到较好的加固效果。
And on such a basis , it is suggested that under the artificial soil order , a new soil type , " engineering disturbed soil " , be established , and based types of disturbance , this type of soil be further divided into engineering heaped soil and engineering sinking soil 最后建议在人工土纲下独立出一土类“工程扰动土类” ,并根据扰动类型的不同,将工程扰动土分为工程堆垫土、工程下陷土。
It is required from ecological environment construction and western china development that turning cultivated farmland into forest and grassland should be enhanced in the yangtze river basin , and prevent artificial soil and water loss according lawfully and strengthen overall supervision and law enforcement in soil and water conservation 生态环境建设和西部大开发要求长江流域加大退耕还林还草力度,依法防治人为水土流失,全面加强水土保持监督执法工作。