南京林业大学学报(自然科学版) ›› 2011, Vol. 35 ›› Issue (05): 135-138.doi: 10.3969/j.jssn.1000-2006.2011.05.030

• 研究简报 • 上一篇    下一篇

湿地松林下6树种光合日变化及其与环境因子的关系

吴统贵1,曾广泉2,肖杨根2,姚婕3,虞木奎1*,成向荣1,王臣1   

  1. 1.中国林业科学研究院亚热带林业研究所,浙江富阳311400; 2.吉安县林业科学研究所,江西吉安343100;3.宁国市林业局,安徽宁国242300
  • 出版日期:2011-09-30 发布日期:2011-09-30
  • 基金资助:
    收稿日期:2010-06-28修回日期:2010-11-09基金项目:国家林业局“948”项目(2008-4-50);“十一五”国家科技支撑计划(2006BAD03A1603);浙江省林业科技项目(06A01)作者简介:吴统贵(1981—),助理研究员,博士。*虞木奎(通信作者),研究员。Email:yumukui@sina.com。

Daily variation of photosynthesis of six tree species under Pinus elliotii forest and their relations with environmental factors

WU Tonggui1,ZENG Guangquan*   

  1. 1.Research Institute of Subtropical Forestry, Chinese Academy of Forestry, Fuyang 311400,China;2.Research Institute of Forestry of Jian County, Jian 343100,China;3.Ningguo Forestry Bureau, Ningguo 242300, China
  • Online:2011-09-30 Published:2011-09-30

摘要: 以红壤区湿地松林下栽植的6树种为研究对象,监测了各树种叶片净光合速率(Pn)的日变化,同时系统分析了Pn与各环境因子间的关系。结果发现,麻栎(Quercus acutissima)、黧蒴锥(Castanopsis fissa)、木荷(Schima superba)和胡枝子(Lespedeza bicolor)的Pn日变化均呈现为先增加后降低的趋势,最大值均出现在11:00,分别为(1982±266)、(1458±179)、(1611±482)、(1492±367) μmol/(m2〖DK〗·s);而椤木石楠(Photinia davidsoniae)和杨桐(Adinandra millettii)则呈现为双峰曲线,最大值分别为(891±181)、(1085±163)μmol/(m2〖DK〗·s)。各树种日平均Pn从大到小的顺序依次为麻栎、木荷、黧蒴锥、胡枝子、杨桐、椤木石楠。方差分析发现,麻栎、黧蒴锥、木荷的Pn显著大于椤木石楠和杨桐(p<005)。通径分析发现,黧蒴锥、麻栎和胡枝子的Pn动态变化主要受饱和水蒸气压差(VPD)、温度(T)、相对湿度(RH)和光合有效辐射(PAR)的影响;木荷主要受VPD、T和PAR的影响,而椤木石楠和杨桐的主要受VPD、T、RH的影响,且各物种各因子均具有较大的间接通径系数。

Abstract: Daily variations of net photosynthesis rates (Pn) of 6 tree species in red soil under Pinus elliotii forest were determined and their relation with environmental factors were analyzed using path analysis. The daily courses of Quercus acutissima, Schima superba, Castanopsis fissa and Lespedeza bicolor showed unimodal curves, with the maximum of (1982±266), (1458±179), (1611±482), (1492±367) μmol/(m2〖DK〗·s) at 11:00 am, and Adinandra millettii, Photinia davidsoniae presented bimodal curves, with the maximum of (891±181), (1085±163) μmol/(m2〖DK〗·s). The sequence of daily average of Pn was Q. acutissima >S. superba > C. fissa > L. bicolor > A. millettii > Ph. davidsoniae, and significant differences were found among Q. acutissima, S. superba, C. fissa and A. millettii, Ph. davidsoniae (p<005). Based on pathway analysis, Pn was mainly influenced by vapor press deficit (VPD), temperature (T), relative humidity (RH) and photosynthetic active radiation (PAR) for Q. acutissima, C. fissa and L. bicolor. While S. superba was mainly influenced by VPD, T and PAR. Whereas for A. millettii and Ph. davidsoniae

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