Stem SaP Flow Dynamiesin Relationto Environmental Factors Of Larix Gmelini

This paper applies Granier thermal diffusion technology to determine sap flow velocity with Larix gmelini in ChaoCha forest farm at Daxing'an Mountain GenHe area, and Combine to eight environmental factors such as air temperature, relative humidity, effective radiation, wind speed, etc., and analyzed the relation between sap flow density and environmental factors and the mostly environmental factor of influencing the change of sap flow density. The result shows that:(1) The correlation of Larix gmelini sapwood area and diameter is significant, the regression equation of chinese larch sapwood area and diameter is that: S=0. 098053D2+0.9444D+25.0521(2) The diurnal variation of Larix gmelini sap flow velocity is single peak curve. But it changes double and multiple peak curve which is starting wee hours, appearing the peak at noon , decreasing subsequently, entering low valley at night from single peak curve which is starting wee hours, appearing the peakat noon, decreasing subsequently, steeping rise at afternoon, entering low valley at nighton those opened.(3) It shows that the correlation of effective radiation of mitsukazu, effective radiation, solar irradiation, net flax, wind speed, average temperature of atmospheric, average humidity of atmospheric, average vapor pressure and chinese larch sapwood area is significant after analyzed the correlation of Larix gmelini sap flow velocity and meteorological factors.(4) There was Linear Relationship between Larix gmelini diameter and water consumption of monthly, and the regression equation is that: T=0.0096S-0.8515. If combined with the regression equation of chinese larch sapwood area and diameter, we can figure out the total water consumption of monthly on forest land over the known diameter of standard tree.