| In order to explore the growth law of different poplar clones and characteristics of transpiration water consumption, choose excellent poplar clones for this area and provide theoretical basis and technical support for poplar plantation's fast growth, intensive cultivation and care management, Principles of plant physiology ecology and measurement technology of growth are used for measuring growth indicators of the 5-year-old different poplar clones, daily change of their transpiration rate, rate of water consumption by transpiration and water consumption of transpiration, and ecological factors (PAR, Ca , WC) in nursery garden in forestry bureau of Gaomi City. The paper discusses for daily change of physiological factors and their response process for the change of ecological factors, and physiological and ecological factors on the impact of growth, and analyses the quantitative relation between physiological factors and ecological factors, and confirmed different characteristic of rate of water consumption by transpiration measured by two methods, chooses the excellent poplar clones for this area at last. The following are main results:1.The 1～5a's growths of 11 poplar clones's height, diameter at breast height and volume gradually increase. The H, D and V of L35, which is the most, are 18.04m, 18.4cm and 0.19753 m3, NL1388, which is the least, are 14.85m,14.45cm,0.10506m3. The growth curves of mean annual increment and current annual increment of the 1～5a 11 poplar clones's H, D are convex, but the growth curves of V are concave. The H growth of poplar clone is earlier than D. The differences of different poplar clones are getting bigger and bigger with the H, D and V's fast growth of 11 poplar clones; The clones's growth are bigger, the significance difference of clones's number are more with it. Various poplar clone's D and crown diameter, D and H, H and crown diameter have a good linear relation, power function relation and logarithmic function relation. The growth processes of different poplar clones's H, D and V can be better simulated by Logistic.2. Daily changing tendency of 11 poplar clones's Tr is just the same as their Gs in different seasons; the change of Tr and Gs are positive correlation. Changing tendency of 11 poplar clones is generally unanimous with single-apex curve in 5 , 8 seasons. An average Tr of two months of 11 poplar clones is extreme significance difference(F=22.91﹥F0.01=4.351,sig.=0.000), shows which the change of environment factors cause the discrepancy of different poplar clones's Tr. Correlation of various influence factors and Tr are of the following order, Gs﹥PAR﹥RH﹥Tc﹥TL﹥Ca; the impact factors influenced by Tr in 5 is less obvious than the impact in 8, shows which the change of environment factors result in Tr's increase, and strengthen the correlation of between Tr and influence factors. The relationship of 11 poplar clones between Tr and their influencing factors are good linear function, regression equation achieves the extreme significant level. Tr has the most obvious impact of D, the following is V and H, shows which Tr influencing D is bigger than H.3. Daily dynamic changing tendency of 11 poplar clones's rate of water consumption by transpiration is single-apex curve. The most's rate of water consumption by transpiration, I-107, is 0.0346 kg?m-2?h-1, and the least, T26, is 0.0168kg?m-2?h-1, the daily the biggest rate of water consumption by transpiration are of the following order, I-107﹥L35﹥NL95﹥zhonglin2025﹥NL895﹥NL80106﹥beikangyang﹥L323﹥NL1388﹥80-2-9﹥T26. The correlation between rate of water consumption by transpiration and WC, RH, PAR, Tc and W are of the following order, PAR﹥RH﹥Tc﹥WC﹥W. The relationship of 11 poplar clones between rate of water consumption by transpiration and environmental factors are good linear function, regression equation achieves above the significant level. 4. Single water consumption of transpiration is decided by between rate of water consumption by transpiration and single leaf area. the single water consumption of transpiration are of the following order, L35(11.9127kg)﹥I-107(7.5168kg)﹥zhonglin2025(5.5021kg)﹥NL895(4.0518kg)﹥NL80106(4.0439kg)﹥beikangyang(4.0435kg)﹥NL1388(3.5567kg)﹥T26(2.9235kg)﹥L323(2.5626kg)﹥NL95(2.5117kg)﹥80-2-9(1.9617kg). therefore, single leaf area influencing water consumption of transpiration is more than rate of water consumption by transpiration. The correlation between rate of water consumption by transpiration, single water consumption of transpiration and V is the most, the following is D and H. The stepwise regression between characteristics of transpiration and V shows that V influenced by single water consumption of transpiration of L35, NL95, I-107, 80-2-9, beikangyang is the biggest, the rest 6 poplar clones's rate of water consumption by transpiration influencing V is the biggest.5. The rate of water consumption by transpiration of 11 poplar clones measured with portable steady state porometer method was always higher than standard branch soaking method. The difference about the ratios of measured value between the two methods was not obvious when transpiration rate was lower in the morning and evening, but the difference increased with the transpiration rate increasing. The regression analysis of the rate of water consumption by transpiration by two measured methods shows that T26 is good power function relation, NL1388 and beikangyang are good exponential function relation, the rest clones are linear relationship, correlation achieves above the significant level. It shows that rate of water consumption by transpiration measured with portable steady state porometer method can figure out the adjacent factual rate of water consumption by transpiration.6.By relative theory of grey model, the relation between the poplar clones's V and climate factors are analyzed. The result shows that water(annual precipitation, annual evaporation, annual relative humidity) is the leading factor effecting of V, illuminance(annual sunshine hours) is the second and heat quantity(annual highest temperature, annual lowest temperature, annual 10℃accumulated temperature) is the last. In soil factors, WC is the leading factor effecting of V, next is soil physics character and the last is soil nutrients.7.According to the 5-year-old's single V, rate of water consumption by transpiration and water consumption of transpiration of the different poplar clones, the cluster analysis show that 11 poplar clones are divided into 6 categories. A class (L35), C class (I-107) and D class (zhonglin2025) belong to rapid growth, large water consumption, capacity of large water consumption; E class (L323, 80-2-9, T26) belongs to fast growth, low water consumption, capacity of smaller water consumption; F class (NL895, NL80106, NL1388, beikangyang) belongs to faster growth, larger water consumption, capacity of medium water consumption; E class (NL95) belongs to low growth, lower water consumption, capacity of larger water consumption. Therefore, the rapid growth of L35, I-107 and zhonglin2025, which plant in the sufficient water sandy soil, are selected. The fast growth of L323,80-2-9 and T26, which plant in natural rainfall conditions's sandy soil, are picked. The faster growth of NL895, NL80106, beikangyang and NL1388, which plant in the critical period of water demand for irrigation's sandy soil, are chosed.
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