The Study On The Anti-damage Capacity Measuring Of Forest-ecosystem In Watershed Runoff Nodes

The past decades have witnessed numerous damages of the forest-ecosystem in watershed runoff node, and these changes had negative influence on forest ecological quality as well as its anti-disaster capacity.Knowing the anti-disaster capacity of forest-ecosystem in watershed runoff node can provide the forest-ecosystem recovery works with viable evidences,therefore,the scientific evaluation should be given to it.This paper mainly proposed some effective measures to enhance the anti-disaster capacity of forest-ecosystem in watershed runoff node,with evaluating the anti-damage capacity of the forest-ecosystem in Chun-ling River via field investigation and data analysis.The research details show below:(1)The distinguishing of watershed runoff nodes.we collected the DEM which have high resolution up to 5m in research areas to distinguish these watershed runoff nodes form others.At first, based on the analysis of original DEM,we can found flow directions in every pixels of this DEM, then,calculating the flow values of each runoff nodes as well.Finally, obtaining these watershed runoff nodes via the analysis of water flow accumulation matrix.(2)The spatial distribution of vegetation in Chun-ling River runoff nodes:We choose it as our typical example to investigate the vegetation, analysing the spatical distribution regularities of every features and what impact it has to the The spatial distribution of vegetation.All of these effects we made can gives Basic data for the further research.(3)The anti-damage capacity evaluation system of the forest-ecosystem:An evaluation system are established to evaluate the anti-damage capacity of the forest-ecosystem in Chun-ling River,with the system evaluation theory,related research achievement,and spatial distribution of vegetation are introduced in these research.(4) the anti-damage capability evaluation of the forest-ecosystem in Chun-ling River runoff nodes:With a systematic consideration to environmental factors, interference factors, structural and functional factors which play major roles in the main forest stand types of Chun-ling River, the damage degree is divided to 5 levels as minor damage, low damage, moderate damage, high damage and severe damage by choosing 16 indicators representing the characterizations of vulnerability to analyze the anti-damage capability of runoff nodes in this forest ecosystems at three levelsThe results showed that the anti-damage capabilitiy of runoff nodes at level 3,level 2, level 1 in this forest ecosystems represent strong,normal and weak respectively.The research results correspond to the reality,therefore,we proposed some targeted methods to preserve the forest-ecosystem,which can provide Sustainable development of forest-ecosystem with scientific references.