Simulation On The Response Of Vegetation Net Primary Productivity (NPP) To The Climate Change In Hangzhou Bay

In order to understand the impact of the climate change on regional NPP,the author used the LPJ-DGVM to simulate the plant NPP in Hangzhou Bay with the realistic climate data and investigated the impact of annual CO₂ density,air temperature and precipitation.And the change of plant NPP is calculated in different climate,when annual CO₂ density increased 1.5PPMV.The results is as follow:(1)With the realistic climate,the LPJ-DGVM stimulate that there are 4 primary PFTS in Hangzhou Bay,that the annual leaf index is about 5.0,and that the plant (?)is about 552.095C/m²Ã‚·a.According with the references and on-the-spot investigations,the simulation with the model is credible and practical.(2)Using the DEM and its derivation data.(?)was interpolated spatially with the method multiple regression.The correlation coefficient is 0.404 and throughα=0.05 confidence interval examination.The distribution of(?)and its change with the DEM were analysed.In Hangzhou Bay,the plant(?)is between 385.274 and 605.864gC/m²Ã‚·a.Majority of mountainous area plant(?)is above 480gC/m²Ã‚·a,but the less value appears near the summit.In coastal plain,(?)is 550gC/m²Ã‚·a.(3)With the increment of annual CO₂ density,(?)in Hangzhou Bay increased gradually.(?)in Hangzhou Bay reduced with the increment of air temperature.(?).Along with precipitation's increment,Hangzhou Bay's(?) showed a tendency of decreasing at the lower part of precipitation and increasing at the middle part of precipitation and decreasing at the top part of precipitation. Along with precipitation's decrease,(?)of the Hangzhou Bay increased firstly, and then decreased.(4)It showed that the climate impact on the NPP when both air temperature and precipitation changed didn't equal to the sum of the impact when air temperature or precipitation changed.