Studies On Photosynthetic And Growth Characteristic Of The Seeding Of Paulownia Clones

This research was based on the ten paulownia clones were come from P.tomentosa × P. fortunei hybridized, These clones named as 1B, 2B, 4B, 5B, 6B, 7B, 8B, 10B,13B and 9501(ck). study guound diameter, chest diameter, height, photosynthesis, transpiration and so on targert of ten Paulownia clones, for the purpose of further promulgating the different Pawlownia clone the growth developmental mechanism, then provides the important scientific basis for the formulation reasonable Pawlownia cultivation and the improved variety selective breeding technology.The mainly results were listed as follow:(1) It is that the soil section of culture district has obvious level of superposing that the Paulownia clones; The soil is received hydrothermal strongly, the soil particle takes powder grains of sand as the core, as a foot-path of advantage with 0.01-0.2mm, the soil layer of 60~80cm, in order to glue the soil layer again, have certain protecting water and the fertile characteristic; Organic matter, P, N content are relatively low, soil unit weight is relatively great. Indicate to the simulation result of the moisture characteristic curve of this soil, the sand soil layer soil is prominent with exponential functional relation, The total soil opposes on more general sand ground in water ability strongly, the soil suction is whether the Paulownia clones can utilize moisture to resist the key of the drought.(2) Analyse and research Paulownia clones department light of seedling stage photosynthetic curve, transpiration curve,etc. obtain photosynthetic characteristic, transpiration characteristic shows 10 Paulownia clones seedling stage have stronger adaptation strong light environment, produce and accumulate material, adjust and control photosynthetic and transpiration,divided into three kinds these 10 kinds of Paulownia clones through cluster's analysis, the first kind is 2B and 4B, the second kind is 10B, 13B and ck, the third kind is 1B, 5B, 6B, 7B, 8B(3) It is that characteristic research grows in seedling stage to indicate that the Paulownia clones except 1B, it is in three indexes of growing and two quality indexes that 8 kinds of other Paulownia clones have improvement of the one in various degree more than ck;Especially 4B, 5B, 7B, 13B improve is relatively large, ground diameter, chest diameter and height have improved 0.72-1.12cm, 0.93-1.12cm, 0.42-0.68m averagely separately; The relevant relations between every index are the best with the result of fitting of exponential function.(4) Synthesize 10 Paulownia clones photosynthetis, transpiration, moisture utilize characteristic and grow result of study of characteristic, Choose 5B, 7B two Paulownia clones seedling stage comprehensive property of department these have certain superiority than others, It is the seed selection Paulownia clones with fine comprehensive property offer the important seedling stage basis...