Natural Degree Assessing And Ecological Restoration Of Riparian Zone In The Suburb Of Beijing

Restoration and reconstruction of degraded riparian ecosystem caused by natural and anthropogenic disturbances is one of the important issues in restoration ecology and watershed ecology. The degradation of riparian ecosystem appeared as the instabiliting of its structure and the invalidation of its functions. Natural degree assessing is an important issue in stream restoration and establishing an assessing index is necessary.To discussing the degradation degree of riparian zone in the influences of human disturbing, this paper has presented the assessment theory and method of riparian zone ecosystem. The full-around definition and the function of riparian zone has been expressed and descripted. On the base of the feature of riparian zone, the comprehensive assessment includes structure stability assessment, and functional service assessment. There are many influent factors on these assessments. After these influent factors had been known, the assessment index system could have been constructed. Because of the hierarchy and fuzzy characteristic of the index system, the hierarchy-fuzzy method has been applied, and the assessment models have been formed.(1) The near-natural assessment system of small scale riparian zone ecosystems use the researches in natural conditions to be reference sites, and evaluate the near-natural degree of structures and functions of degraded small scale riparian zone ecosystems which is disturbed by human activities or sudden natural changes. The near-natural assessment system of small scale riparian zone in the suburb of Beijing is on the base of plentiful field data, choosing 18 structure indicators and 13 function indicators to construct the assessment index system. it The near-natural degrees of riparian zone ecosystem can be devided into four grades:â… natural grade ( no artificial disturbs);â…¡near-natural grade (minimal artificial disturbs );â…¢degraded natural grade ( serious artificial disturbs);â…¥complete man-made grade.(2) The natural assessment system of riparian zone ecosystem in suburb of Beijing is used to assess Undamu River riparian zones.It offers the necessary suggestions to the riparian environment protection.(3) Human activity disturbing represent as the stream use. Degenerated riparian zone represent as the decreasing or disappearing of vegetation. The paper compartmentalized the stream use to seven parts, they are culture, breed aquatics, trench and dam, reservoir, travel sites, man-made forestry and nature reserve. During these stream use, breed aquatics and reservoir has made the riparian zone structure singleness, and there are high diversity in nature reserve riparian zone.(4) Bioengineering is an effective measure to protect river bank. In this paper, the functions of riparian forest are discussed, and the technologies of ecological riparian protection and their types are stated and on the basis of these principles and investigating results, the fitting woody plants and their peculiarity and propagating technique are provided in detail to be the theoretical foundation for realizing the ecological restoration and scientific management of river resources.