Establishment Of Ecological Assessment System For Tidal Flat Reclamation In Zhejiang Province And Its Software Development

Based on an analysis of actuality about seashore(river) tide flat wetland ecosystem and reclamated tidal flat complex ecosystem,we established a series of principles to build up a index system of ecological assessment for tidal flat reclamation.Father,by combinating Analytic Hierarchy Process(AHP) and Experts' Scoring Method,an index system for evaluating tide flat reclamation ecosystem in Zhejiang Province was determined and decided its weight.After that,a software management system related with the index system of ecological assessment was built up in virtue of employing PC and Internet.A case study of Zhejiang Shangyu Tidal Flat reclamation ecosystem was conducted.According to its ecological evaluation of different ecosystem of both before and after reclaimation,the following results were obtained.First,based on the complex ecosystem of Society-Economy-Nature,some important principles should be carefully considered to build up a index system for evaluation which include:(1)integrity and pertinence; (2)objectivity and operability;(3)systematicness and relevance;(4)specific and general indicator.Second, by considering the general situation and various circumstances,index system for ecological evaluation to tide flat reclamation complex ecosystem may consist of one index at target-layer,three indexes at guide-layer and 24 index at step-layer.Finally,The structure and its function of management software system was operating to take the evaluating system as a database core contents,and the J2EE configuring for system platform,and the data sharing network as tool,and to develop a programmable multilevel architecture.The results indicated high coefficients of variation of top soil salinity and organic carbon,as well as watery pH and conductance in the framework of spatio-temporal over all the samplings.The date revealed the high salinity and the low organic carbon content in the new-century zone and relatively low salinity and the high organic carbon level in the 69 zone of the studied field.It s the high watery pH and conductance level before reclaimation and accordingly low level after reclaimation.In the same reclaimation area of historical age,comparing the land of planting rice or ruderal to planting vegetable or cotton,the soil of planting rice or ruderal had stronger capability of carbon conservation.Otherwise by employing the established ecological assessment index system and software management system,the complex ecosystems of the 84-zone,i.e.Haitu Experiment Farm reclamated in 1984,and new-century zone newly reclamating since 2000 in Shangyu Tide Flat reclamation as the case study were carefully evaluated.The score of integrated evaluation was 80.7 and 65.3.It was concluded that the scientific and appropriate exploiture of the tide flat will fruit in to a better consequences both socio-economic benefits and natural ecoenvironment and to a harmonic and sustainable development complex ecosystem of Society-Economy-Nature.