土壤植被系统及其坡面生态工程意义

SOME UNDERSTANDING ABOUT SOIL_VEGETATION AND SLOPE ECO_ENGINEERING

坡面生态工程不同于传统的土木工程，它把植被及其对坡面不稳定的影响与侵蚀过程联系起来，这个生物学途径中的一个重要概念是“土壤植被系统”，它强调了生态工程途径的生物生态学属性，由它可推导出一定的理论假设，即土壤植被系统的若干属性和性能。这些理论实体和假设有助于对坡面生态工程科学原理的构建。

In the past decades, the importance of vegetation in protecting slopes has been stressed by many researchers. The great awareness that vegetation can play a range of roles in slope protection has made it increasingly a valuable tool in the control of erosion and the stabilization of slopes. This knowledge has led to a increasing application of vegetation types world_wide for these purposes. Slope eco_engineering (SEE) relates vegetation and its effect on slope instability with erosion control. With its bio_ecological characteristics and its dynamic nature, SEE differs from traditional civil engineering. An important concept within this biological approach is the “soil_vegetation system'(SVS). This concept can be defined that in a given area the organic whole which consists of the biological group led by vegetation, the rooted soil and parent materials is the SVS. It has certain components, including geological, geomorphological, climatic and human factors, and system boundary, which is determined by the spatial structure of the system′s composing elements. An SVS can be a natural system or an artificial one. The former category would include natural systems and the latter is transformed from a natural system or newly established by man′s ingenuity. A given SVS is provided with certain eco_biological natures and engineering properties, which are significant in its SEE application. SVS is a theoretical substance, its natures and properties are theoretical hypothesis of the SVS. They form a part of the theoretical basis of SEE. These theoretical substance and hypothesis are significant in the development of scientific principle of slope eco_engineering.