| Water is an important part of the body of the plant, accounting for80%of the non-lignifiedtissues such as leaves and root biomass to95%, and also the plant metabolism importantcarrier and participants. Water plants and ecosystems, the water cycle is extremely importantin the metabolism of the plants. This article select the source of Taihu Lake in ZhejiangProvince town operating Leizhu Lin of praecox, Anji City mountains Township pubescensMoso bamboo efficient artificial as the object of study, measured liquid flow rate, transpirationrate, water use efficiency, and stomatal conductance were observed test the vapor fluxcharacteristics of the region throughout the year, as well as a variety of environmental factors,in order to provide a theoretical basis for the rational use of local bamboo forest moisture.The results show that:1、 Basic under Phyllostachys praecox stands annual water vapor flux is positive, thehighest in summer, the change characteristics similar to the spring and autumn, the winterminimum, the highest month of July, the lowest month of January. Experimental annualprecipitation1201.72mm, evapotranspiration669.84mm, evapotranspiration accounted for55.74percent of the annual precipitation, artificial coniferous forest, larch, Korean pine forest,oak woods, weed trees, fir and other mine low bamboo evapotranspiration. February, Octoberand December evapotranspiration is slightly larger than the precipitation, evapotranspirationin the rest of the year were less than the current month precipitation, precipitation andevapotranspiration to June the biggest difference. Under Phyllostachys praecox stands vaporflux in a highly significant correlation with the local net radiation, the correlation coefficient of0.6to0.017.2、 Pubescens annual water vapor flux Basic is positive on the monthly scale, the watervapor flux showed a single-peak change, and the maximum value for each month are inbetween12:00-14:00, showing a certain regularity, the highest month of July (0.1116g m-2 s-1), the lowest month of December (0.0209g m-2 s-1); seasonal scale, the highestsummer water vapor flux (0.0873g m-2 s-1), showing the typical variation of the singlepeak spring and autumn (both0.0541g m-2 s-1), followed by the variation characteristicssimilar to summer and lowest in winter (0.0221g m-2 s-1), the curve changes is complexand volatile. Test area annual evapotranspiration （744.72mm） total annual precipitation（1543.10mm）48.26%. February, April, May, November, December evapotranspiration isslightly larger than the precipitation, evapotranspiration in the rest of the year were less thanthe precipitation, of which the biggest difference between precipitation and evapotranspirationto June. Seasonal scale pubescens vapor flux and net radiation Regression Relation summermaximum, R20.6111autumn0.5295the spring to0.2605, winter minimum to0.0455by Ftest, water vapor flux and net radiation between linear relationship is extremely significant. 3、Spring sap flow rate variation Taihu Town, artificial Lei Zhulin efficient operations moresignificantly, showing the trend of a single peak, better regularity. Flow rate variation and ofSummer Lei Zhulin ecosystem is more complicated-day liquid flow rate, and its fluctuationrange. The praecox liquid flow rate variation autumn and summer is similar, but its fluctuationrange is smaller than in summer, and the day of liquid flow rate is less than the summer dayliquid flow rate. Praecox winter small liquid flow, and small changes throughout the day ismore gentle, no big l big drop. The annual maximum values in July for210.01gm/hr, theannual sap flow minimum in April to51.25gm/hr.4、August, the annual bamboo maximum liquid flow, for73601.75g, minimum month April6761.12g. Year round winter liquid flow values are generally smaller, did not exceed100gm/hr. Spring in March, when Mao Zhucheng bamboo from the roots to absorb moistureincrease. But in April, a sharp becomes low. The liquid flow rate in May compared with Aprilrebounded, but still lower than in March and June. July the bamboo sap flow fluctuationsduring the day, turn decreased after reaching the maximum at10:00. And then with thegradual reduction of the net radiation, the temperature is reduced, the liquid flow to anothersmall peak appears at17:00hours, and then gradually decreases as the net radiationdecreases. August maximum liquid flow rate for the whole year, its trends and July, themaximum of the month stream flow9:00188.63gm/hr, daytime sap flow volume for the monthremained at a high level.5、 The praecox annual four seasons, light compensation point in light intensity between20-50praecox in the spring by the respiration rate of1.28, with the enhancement of the lightintensity, praecox photosynthesis gradually enhanced in the light, the praecox photosynthesisintensity reached9.97. The summer the praecox net photosynthetic rate of0.901praecoxphotosynthesis intensity gradually increased, as the light intensity increases, when the lightintensity of1500praecox photosynthesis gradually flatten. Praecox lower metabolic rate inthe summer. Fall praecox net respiration rate is the annual maximum,1.98. Praecox and lightsaturation point reached in the fall when the light intensity of600, lower than the spring andsummer. In winter, the praecox light response curve weak photosynthesis, stomatalconductance and lower, slower metabolism. Praecox diurnal variations of photosynthesischaracteristic curve: at6:00the praecox photosynthesis larger with increasing net radiationincreases gradually, by8:00pm the day photosynthesis maximum10.661, after graduallydecline.6、 As the light intensity increases, the bamboo photosynthesis and stomatal conductance invarying degrees of increase, both showing a positive relationship. With increasing Mosobamboo stomatal conductance, bamboo photosynthesis intensity gradually increasing.Photosynthesis intensity in summer （July） is slightly larger than the other seasons in thesame light conditions throughout the year, no significant difference of the size of the other seasons. Phyllostachys edulis strength in the fall （September）, with light intensity range,when the light intensity0:00photosynthesis-1.96for the whole year minimum, when the lightintensity of2000when its photosynthesis7.87, the highest for the whole year. Winter（December） bamboo light response curve, the light intensity of600, the light intensity of thethe bamboo light saturation point, and then decreased slightly with increasing light intensity.Full year photosynthesis weakest spring （March）. |
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