CAJ | 학술논문

选用云烟87,研究4种种植密度(16 665、15 150、13 875和12 825株hm~(-2))对烤烟下、中、上3部位叶片光合及其同化物的影响.结果表明,叶片净光合速率(P_n)、比叶重以及碳水化合物总量在成熟期(移栽60 d以后)明显表现出密度效应.随着群体生育进程的推进,密度对3个指标的影响程度有增大趋势.降低种植密度可以减小叶片P_n下降率,延缓光合功能的衰退,延长同化产物的积累时间.下部叶除12 825株hm~(-2)外,其他3处理均未出现光合"午休"现象;而上部叶片均出现"午休"现象;较高种植密度能够减轻中部叶片"午休"的程度.在15 150株hm~(-2)的种植密度下,中部叶片日光合总量较高,光合产物也达到较高水平,叶片光合作用和蒸腾作用也达到最为协调的状态.有着较高的水分利用率.
선용운연87,연구4충충식밀도(16 665、15 150、13 875화12 825주hm~(-2))대고연하、중、상3부위협편광합급기동화물적영향.결과표명,협편정광합속솔(P_n)、비협중이급탄수화합물총량재성숙기(이재60 d이후)명현표현출밀도효응.수착군체생육진정적추진,밀도대3개지표적영향정도유증대추세.강저충식밀도가이감소협편P_n하강솔,연완광합공능적쇠퇴,연장동화산물적적루시간.하부협제12 825주hm~(-2)외,기타3처리균미출현광합"오휴"현상;이상부협편균출현"오휴"현상;교고충식밀도능구감경중부협편"오휴"적정도.재15 150주hm~(-2)적충식밀도하,중부협편일광합총량교고,광합산물야체도교고수평,협편광합작용화증등작용야체도최위협조적상태.유착교고적수분이용솔.
The leaves in three positions (leaf 5, 11, 17 from bottom to top) of flue-cured tobacco Yunyan 87 with four planting densities (16 665, 15 150, 13 875, and 12 825 plants ha~(-1)) were tested in the field experiment in Liangfeng Village, Xuanen County, China in 2008. The results indicated that the net photosynthetic rate (P_n), specific leaf weight and carbohydrate content exhibited significant difference under various planting densities in mature period (60 days after transplanting), and the impact of plant density increased in the process of leaf development. With the decrease of planting density, the decline rate of P_n was reduced, photosynthetic function decline was delayed, and the accumulating time of assimilation was prolonged. The lower leaf did not appear photosynthetic midday depression under three planting densities except under the lowest density (12 825 plants ha~(-1)). The upper leaf appeared photosynthetic midday depression under all the planting densities. Degree of photosynthetic midday depression for the middle leaf was lightened under lower densities. Under planting density of 15 150 plants ha~(-1), the middle leaf had higher daily photosynthesis and assimilation, and the photosynthesis and transpiration achieved the most coordinate state, exhibiting higher single-leaf WUE.