Study On The Functional Value Of Eco-service And Network Space Efficiency Of Shengjin Lake National Nature Reserve

In order to break through the traditional framework of "Talking about ecosystem in terms of ecosystem",the ecosystem in nature reserve is optimized and adjusted from the dynamic-and macro-level to realize the high-efficiency increment of ecosystem by means of ecological network.Using the research ideas of relevant scholars as reference,this paper analyzed the spatial efficiency of ecosystem network,and determined that the spatial efficiency of Shengjin Lake Reserve can be divided into three steps,namely,self-repair,spatial expansion and infiltration connection.The first step is to dismantle the enclosure and prohibit fish farming in order to achieve maximum self-optimum restoration of the lake.The second step(spatial expansion)is to determine the natural and man-made disturbance factors of wetland ecosystem in order to reduce or even eliminate this disturbance.Therefore,we need to returm the area originally belonged to wetland ecosystem land to the situation permitting.The natural disturbance factors are seasonal disturbance and annual rainfall disturbance.The human disturbance factors are embankment construction,resource consumption,pollutants and invisible pressure.The range of wetland ecosystem was 170.22 km2.The adjusted wetland ecosystem occupied 22.73 km2 of farmland and 0.31 km2 of a small number of water-facing settlements.The range of wetland ecosystem increased by 1.05 km2 due to the breakthrough of levees after the removal of enclosure.Step 3(osmotic connection)links the natural ecosystems in nature reserve,especially restoring the original forest ecosystems,and minimizes the occupation of farmland and residential land based on the concept of biological ecological corridor.According to the existing relationship between forestry Iand and wetland ecosystem,the ecological corridor can be found by means of green space ecological network,pedal and continuous methods,which can provide a continuous habitat for a large number of organisms,help a large number of organisms to reproduce,and protect and improve biodiversity.The adjusted wetland land use is 157.22 km2,farmland 83.75 km2,forestry land 58.40 km2,urban land 34.30 km2,and the adjusted value of ecological service function is 357,407.72 million yuan,an increase of 2285.09 million yuan over the original ecological value.