Soil heterotrophic respiration in Casuarina equisetifolia plantation at different stand ages  

不同林龄的木麻黄林下土壤异养呼吸特征(英文)

作　　者：肖胜生[1,2] 叶功富[3] 张立华[4] 金钊[5] 刘丽香[1,2] 

机构地区：[1]中国科学院地理科学与资源研究所,北京100101 [2]中国科学院研究生院,北京100039 [3]福建省林业科学研究院,福州350012 [4]厦门大学生命科学学院,厦门361005 [5]中国科学院地球环境研究所,西安710075

出　　处：《Journal of Forestry Research》2009年第4期301-306,I0004,共7页林业研究（英文版）

基　　金：supported by Key Projects in the National Science & Technology Pillar Program during the EleventhFive-year Plan Period (Nos. 2006BAD03A14-01);Important Science & Technology Specific Projects of Fujian province (2006NZ0001-2);supported by the Key Laboratory of south mountain timber culti-vation, state forestry administration, P. R. China

摘　　要：The soil respiration rates （Rh） in 6-year-old （young）, 17-year-old （middle-age）, 31-year-old （mature） Casuarina equisetifolia coastal plantations were measured using an LICOR-8100 automated soil CO2 flux system from May 2006 to April 2007. Results show that Rh displayed an obvious seasonal pattern across the observed years. The maximum values of Rh occurred at June and July and the minimum at December and January. Soil temperature and soil moisture as well as their interaction had significant effects on the monthly dynamics of Rh. The analysis by one-way ANOVA showed that Rh had a significantly exponential relation （p〈0.05） to soil temperature at soil depth of 5 cm, and had a linear relation （p〈0.05） to soil water content of the upper 20 cm. The result estimated by the two-factor model shows that soil temperature at soil depth of 5 cm and soil moisture at soil depth of 20 cm could explain 68.9%-91.9% of seasonal variations in Rh. The or- der of Rh rates between different stand ages was middle-age plantation〉mature plantation〉young-age plantation. With the increase of growth age of plantation, the Q10 of Rh increased. The contribution of Rh to total soil surface CO2 flux was 71.89%, 71.02% and 73.53% for the young, middle-age and mature plantation, respectively. It was estimated that the annual CO2 fluxes from Rh were 29.07, 38.964 and 30.530 t.ha^-1.a^-1 for the young, middle-age and mature plantation, respectively.以中国亚热带木麻黄沿海防护林为研究对象,在2006年5月-2007年4月,利用LI-8100土壤呼吸自动观测系统对不同林龄(幼林、中林、成林)木麻黄人工林生态系统的土壤异养呼吸特征进行了监测。结果表明,不同林龄木麻黄林地土壤异养呼吸季节动态均呈单峰曲线,最大值出现在6～7月份,最小值则出现在12～1月份。土壤温度和水分对土壤异养呼吸的季节变化存在显著影响,并有明显的交互作用,进行单因素方差分析发现,土壤异养呼吸季节变化与5cm深的土温存在着较好的指数相关关系(p<0.05),与土壤表层含水量存在较好的线性相关关系(p<0.05)。双因素模型模拟结果显示,5cm土温和土壤表层含水量能够共同解释土壤异养呼吸变异的68.9%～91.9%(p<0.05)。不同林龄下土壤异养呼吸速率差异显著(p<0.05),其平均土壤异养呼吸速率呈现为中林>成林>幼林。随着林龄的增大,土壤异养呼吸对土壤温度的敏感性增强。土壤异养呼吸对土壤总呼吸的贡献在幼林、中林、成林中分别达到71.89%、71.02%和73.53%。幼林、中林、成林样地土壤异养呼吸CO2年释放量分别为29.072、38.964和30.530t·hm-2·a-1。

关 键 词：soil heterotrophic respiration coastal plantation stand age Casuarina equiset（folia 

分 类 号：S792.93[农业科学—林木遗传育种]