杉木人工林和水稻田土壤呼吸Q10值的影响因素初探.pdfVIP

第2卷 第4期 亚热带资源与环境学报 Vo1．2 NO．4 2007年12月出版 Journal of Subtropical Resources and Environment December 2007 杉木人工林和水稻田土壤呼吸Qlo值的影响因素初探 高人，唐英平，杨玉盛，尹云锋，陈光水，李又芳，邱敬 (福建省亚热带资源与环境重点实验室，福州350007) 摘要：通过实验室自然变温实验，利用LI一8100研究温度和培养时间对2种土地利用方式 (杉 木人工林和水稻田)的土壤呼吸温度敏感性的影响，培养时间为18O d．结果表明，指数模型 较好地拟合了土壤呼吸速率与5 cm处土壤温度的关系，并且低温时段优于高温时段的拟合效 果．土壤呼吸Q 。值随5 cm处土壤温度的升高呈降低趋势，杉木人工林地土壤 Q 。值由3．18 下降到1．40，而水稻田土壤Q 。值则由2．97下降到1．51，且二者差异不显著 (P0．05)，说 明土地利用方式对土壤呼吸温度敏感性影响不大．回归分析表明，林地和水田的Q 。值与培养 时间均呈极显著的负相关关系，表明除温度外，Q 。值的变化还与培养时间有关． 关键词：土壤呼吸；Q 。值；杉木人工林；水稻田；LI一81()() 中图分类号：S181；Q145 文献标识码：A 文章编号：1673—7105(2007)04—0009—06 Ql0 Values of Soil Respiration and Its Affecting Factors for Chinese fir Plantation and Paddy Field GAO Ren，TANG Ying—ping，YANG Yu—sheng，YIN Yun-feng，CHEN Guang—shui， LI You—fang，QIU Jing (Key Laboratory of Subtropical Resources and Environment of Fujian province，Fuzhou 350007，China) Abstract：Temperature sensitivities of soil respiration for tWO land use types(Chinese fir plan— tation and paddy field)as affected by soil temperature and incubation time were investigated by IA一8100 at laboratory．The incubated time of soil samples were 180 days．The results showed that the relationship between soil respiration and soil temperature at 5 cm depth could be de— scribed as exponential equations，and there was better fit at low soil temperature than at high soil temperature；the Q10 value of soil respiration declined with the increasing of soil tempera— ture and，the Q10 value decreased from 3．18 to 1．4O for Chinese fir soil and 2．97 to 1．5 1 for paddy soil，respectively，but the differences in Q10 between the tWO land use were not signifi— cant(P0．05)，indicating that land