| It is very important to study the interaction of vegetation, soil and atmosphere, which has highly theoretical and realistic meaning. In one side, the study may make the simulating model of climatology and land-biosphere more perfect, in the other side, the study will help to discover the real action of vegetation in the global carbon circle, which gives the more scientific method to estimate accurately biomass and net primary production (NPP) of ecosystem and how much carbon in atmosphere absorbed by vegetation, to predict the possible impact of global climate change on terrestrial ecosystems, and to make scientific strategies for the global change. This paper takes the deciduos needleleaf forest in cold-temperate zone as emphasises to study the interaction of vegetation, soil and atmosphere, which has more materially purport in this field and give better understand of interaction between biosphere and atmosphere.Mainly by using the data of land meteorological observation and sun radiation of Mohe area, Heilongjiang Province, which is located deciduos needlelaf forest area in North China from 2001 to 2002, this paper adopts BATS (Biosphere-Atmosphere Transfer Scheme), accepted in the world, and radiation computing solution developed by Zhou Suoquan et al. to simulate land surface procedure and vegetation growth with 6h integrating step size. NPP of Harbin area is also discussed in the simulating of vegetation growth for die sake of contrast analyzing to Mohe area.It is found in this paper that:1. The radiation computing solution developed by Zhou Suoquan et al. shows good performance on the fluxes simulation of the total surface radiation and net surface radiation, which can reflect the annual and daily radiation change very well, and radiation differences between clear day and cloudy day as well. The results of radiation simulating, summer better than winter and clear day better than cloudy day, can be used in BATS directly, which give a good solution for lacking of land surface radiation observation.2. The BATS can simulate well on the temperature value and change of surface soil and subsurface soil, which can reflect very well that the daily changed temperature of subsurface is obviously lower than that of surface. Snowmelt is considered in the computing of Mohe's soil temperature, which decrease the effect of forced comeback. In the result, the characteristics of temperature stablization in snowmelt time span and the variety trend in other time span also are well simulated. The simulated results of summer is better than winter, day time better than nighttime, and surface better than subsurface.3. Foliage temperature and air temperature have the same changing trend in season. The results show that foliage temperature is nearly equal to or little higher than airtemperature in day time when it is clear day, apparently lower than air temperature while in nighttime, and lower than air temperature when it is cloudy and/or rainy day. Also, vegetation has effect on heat transfer between atmosphere and land surface.4. In the vegetation growth simulating model, a new vegetation phenology and temperature criteria added, which control the growth time of deciduos needleleaf forest in North China, make the simulated results more fit the fact. The simulated results of net primary production (NPP) are similar to other's study. The annual, seasonal and daily change of NPP can reflect the physiological characteristic of vegetation growing very well and has close relationship with climatological factors. In growth season, computed daily NPP has some negative correlation with precipitation and the monthly NPP has apparently active correlation with monthly average air temperature.5. The results of experiment in vegetation growing model show that CO2 increasing and its resulting in climate change would make NPP of deciduos needleleaf forest in the cold-temperate zone apparently higher. |
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