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作 者:卢钰茜[1,2] 王振兴[1] 郑怀舟[2,3] 朱锦懋[1,2]
机构地区:[1]福建师范大学生命科学院,福州350007 [2]福建省湿润亚热带山地生态省部共建国家重点实验室培育基地,福州350007 [3]福建师范大学地理研究所,福州350007
出 处:《生态学报》2012年第8期2466-2473,共8页Acta Ecologica Sinica
基 金:教育部创新团队项目(IRT0960);福建省公益类科研院所基本专项资助(2009R10039-3)
摘 要:通过测定亚热带马尾松和杉木树干韧皮部水溶性糖δ13C值的连日变化,及其对天气变化过程的响应,研究δ13C值对短期天气变化动态的响应特征。结果显示,春季马尾松和杉木树干韧皮部水溶性糖δ13C日均值分别介于-26.81‰到-26.49‰之间,以及-29.26‰到-27.47‰之间,平均值分别为(-26.58±0.12)‰和(-28.67±0.65)‰。进一步分析表明,马尾松树干韧皮部水溶性糖δ13C值与取样之前第4天的太阳辐射、水气压亏缺、相对湿度和空气温度显著相关(P≤0.05),杉木树干韧皮部水溶性糖δ13C值取样之前第3天的太阳辐射、水气压亏缺和相对湿度显著相关(P≤0.05),但与空气温度的相关性不显著(P≤0.05)。在所测定的环境因子中,太阳辐射是影响马尾松和杉木树干韧皮部水溶性糖δ13C值的首要因素。当天降水事件可能导致马尾松和杉木树干韧皮部水溶性糖δ13C值连日变化出现异常波动。马尾松和杉木韧皮部水溶性糖δ13C值可以敏感记录短期天气变化动态。The phloem acts as the main pathway of long distance transport and allocation of nutrients,and as a conduit of inter-organ communication in vascular plants.As a carrier of the dynamic photosynthetic and post-photosynthetic carbon isotope fractionation signal,δ13C value of stem phloem water soluble sugars can be a reliable indicator of whole canopy stomata conductance(Gs) to reflect plant responses to the environmental variables in the plant canopy.Therefore,quantifying the stable carbon isotope fractionation of stem phloem and the extent such fractionation would be impacted by outer environmental variables is the key to understanding plant stem phloem carbon pool discrimination,and interactions between plants and outer environmental parameters.However,nearly all current studies of phloem carbon isotope fractionation of conifer trees had been limited to only several conifers in temperate forests,and there is little information about the impact of abundant availability of water and light,and higher temperature on different conifer tree species in subtropical monsoon ecosystem.Given the importance of exploring plant responses and adaption to outer environmental variables,there was a need for more studies of phloem stable carbon isotope fractionation of additional plant groups in additional ecosystem.The paper measured δ13C value of stem phloem water soluble sugars of Pinus massoniana and Cunninghamia lanceolata for 6 consecutive days from April 20 to 25,2011,and related such values to the daily mean solar radiation(Sr),relative humidity(Rh),water vapor pressure deficit(VPD) and air temperature(Ta) calculated on the sampling day and for 1—7 days before the sampling day,meanwhile combining precipitation(PPT) data for further analysis,in order to reveal the day to day dynamics of stable carbon isotope discrimination of newly assimilated photosynthates in P.massoniana and C.lanceolata stem phloem,and its responses to the studied meteorological factors in subtropics during the spring season.Th
分 类 号:S791.248[农业科学—林木遗传育种]
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