Ecosystem Function And Evaluation Of Mixed Coastal Wetland

The composite coastal wetland is formed by the synthetical effects of driving force, ocean driving force and hunman being, it has rich biological resources and distinctive ecosystem structure. Haixing wetland becomes composite coastal wetland with special propagation interborough, biological community structure, ecological environment and natural landscape, and rich biodiversity resources. But, unreasonable exploitation leaded to the grave degeneration of wetland ecosystem. The thesis studied on the Haixing wetland, by the combination method of investigation on the spot and interior analysis, we studied on the propagation diversity, accommodation function to ecological environment and ecosystem vulnerability, also made the appraisal to the Haixing wetland ecology function. The results indicated:1. By inquiring the wetland type, distribution and area evolution in Haixing wetland the composite coastal wetland could be divided into 4 classes, 10 types. There are 5 natural wetlands and 5 manpower wetlands.2. The composite coastal wetland ecological environment is complicated variously, whose territory species is exceedingly rich. We discovered 147 kinds vegetations, 612 kinds animal. We have also analyzed the value of environment, economy, and scientific research culture.3. Soil moisture content is the main factor that the vegetation affecting wetland displays being accomplished as well as distributing a pattern along slope place grad. Depend on the minus grade place, species rich degree and coverage degree are all comparatively low; there are Perennial monocotyledon and Perennial secondary brushwood growth in the up grade place.4. Community makeup species (Y1) , community cover up with degree (Y2) , much fluffy wing alkali degree (Y3) and soil saltness (x) return equation as y1=15.242-1.0312x, y2=93.341-4.0127x, y3=55.419x-21.774, and R12=0.9813, R22=0.9778, R32=0.9889 that relevance modulus are notable community. With soil salt degree increasing, community diversity shows the decreased trend, the community species gradually unitary-rization, the similarity that the community room species is composed of improves gradually.5. By studying the impact of diversity wet land on the part microclimate, we find that the impact of wet land including increasing air humidity of some areas, reducing the temperature, besides the effect to temperature and humidity in fresh water area is higher than salt water area.6. By studying the ability of wetland purifies water quality, we find that the wetland purification ability is strong, purification has big seasoning fluctuation; the ability stll exist on phosphorus purification in autumn, but lost on nitrogen purification.7. By studying the impact of salina over periphery soil ecological environment, we find that salina extension leads to increasing salinized soil, the salinized soil area have increased 3401 hectares.8. The estimate on ecology functions at the wetland of Haixing, we gets ecological environment quality evaluation exponent CEI is 0.63; general organism's habits service function value is 205,700,000 yuan. Thereinto the immediacy using value is 61,600,000 yuan, while the indirect using value is 144,100,000 yuan, takes up 70.05% of the gross value.9. We must adopt rational exploitation and governing tactics, make combination between using and protecting, get the wetland resource economic effect. At the same time, protect the wetland organism's habits big and powerful function; obtain the sustainable development of wetland ecosystem.