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为探知红松苗对未来大气CO_2浓度的碳、氮响应策略,系统了解不同CO_2浓度下红松幼苗及其土壤碳、氮特征,采用生长箱培养法,分别研究了350、700μmol/mol CO_2浓度下红松幼苗主要器官碳、氮浓度与积累(吸收)量变化,并分析其培养土壤的碳、氮含量。结果表明:与低浓度CO_2处理相比,高浓度CO_2处理并未对红松幼苗根、茎及叶的碳浓度产生显著影响,但导致叶碳积累量显著增加3763%;高浓度CO_2培养导致红松幼苗根、茎、叶氮浓度显著降低,茎氮吸收量显著下降27.45%,根、茎、叶的碳氮比升高,土壤溶解性有机碳含量显著增加2882%,总有机碳、微生物量碳、全氮、微生物量氮及水解性氮含量均未发生显著变化,碳氮比增加。总体上,3年生的红松幼苗氮浓度、碳氮比、叶碳积累量及土壤溶解性有机碳对CO_2升高响应迅速。
In order to understand the carbon and nitrogen response strategies of Korean pine seedlings to future atmospheric CO 2 concentrations, the characteristics of C 2 and N in Korean pine seedlings and their soils under different concentrations of CO 2 were systematically studied. Using the growth chamber culture method, the CO 2 concentrations at 350 and 700 μmol / The changes of carbon and nitrogen concentration and accumulation (absorption) of main organs of Korean pine seedlings were analyzed, and the contents of carbon and nitrogen in the soil were analyzed. The results showed that compared with low concentration CO 2 treatment, high concentration CO 2 treatment did not significantly affect the carbon concentration of roots, stems and leaves of Korean pine seedlings, but significantly increased leaf carbon accumulation by 3763%. High CO 2 culture resulted in red The contents of nitrogen and nitrogen in roots, stems and leaves of pine seedlings decreased significantly, and the absorption of stems and nitrogen decreased significantly by 27.45%, while that of roots, stems and leaves increased, the content of soil dissolved organic carbon increased significantly by 2882%, the total organic carbon and microbial biomass No significant changes were observed in carbon, total nitrogen, microbial biomass nitrogen and hydrolyzable nitrogen, and the ratio of carbon to nitrogen increased. In general, the nitrogen concentration, C / N ratio, leaf carbon accumulation and soil dissolved organic carbon of 3-year-old Korean pine seedlings responded rapidly to CO 2 increase.