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通过人为控制CO2浓度(700、400μmol·mol-1)和氮素水平(120 kg N·hm-2),研究了CO2浓度增加和氮沉降及其交互作用对北界(辽宁庄河)栓皮栎幼苗生理生态特征的影响.结果表明:CO2浓度升高使栓皮栎幼苗叶片的形态、光合色素含量和氮含量有减小的趋势,暗呼吸速率较对照降低63.3%,可溶性糖增加2.6%.氮沉降对栓皮栎叶片的形态和光合色素含量有明显的促进作用,叶N含量增加而K含量降低,N/K值增加26.7%.CO2和N交互作用对幼苗叶形态和光合作用有明显的促进作用,叶片最大净光合速率和光饱和点分别是对照的1.4倍和2.6倍,暗呼吸速率和光补偿点分别降低65.9%和50.0%.CO2浓度升高和N沉降均对栓皮栎幼苗生长有一定的促进作用,可能导致栓皮栎分布界线北移.
The effects of CO2 concentration and nitrogen deposition and their interaction on Q. variabilis in the northern boundary of Zhuanghe, Liaoning Province were studied by artificially controlling CO2 concentration (700,400 μmol · mol-1) and nitrogen level (120 kg N · hm-2) The results showed that: the CO2 concentration increased the leaf morphology, photosynthetic pigment content and nitrogen content of Quercus variabilis seedlings decreased, dark respiration rate decreased 63.3%, soluble sugar increased 2.6% .N Sedimentation significantly promoted the leaf morphology and photosynthetic pigment content of Quercus variabilis, with the increase of leaf N content and the decrease of K content, and the increase of N / K value by 26.7%. The interaction of CO2 and N significantly promoted the leaf morphology and photosynthesis , The maximal net photosynthetic rate and light saturation point of leaves were 1.4 times and 2.6 times that of the control respectively, and the dark respiration rate and light compensation point decreased by 65.9% and 50.0% respectively.C02 concentration and N deposition both had certain effects on the growth of the seedlings of Quercus variabilis Promote the role, may lead to the cv. Quercus distribution northbound.