CO_2浓度升高对红松和长白松土壤呼吸作用的影响  

Soil respiration of Pinus koraiensis and P. sylvestriformis trees growing at elevated CO_2 concentration.

作　　者：周玉梅[1] 韩士杰[1] 辛丽花[2] 

机构地区：[1]中国科学院沈阳应用生态研究所,沈阳110016 [2]沈阳农业大学,沈阳110161

出　　处：《应用生态学报》2006年第9期1757-1760,共4页Chinese Journal of Applied Ecology

基　　金：国家自然科学基金项目(30400051);国家自然科学基金重点项目(90411020);国家重点基础研究发展规划资助项目(2002CB412502).

摘　　要：以开顶箱法研究了CO2浓度升高对红松和长白松土壤呼吸作用的影响．结果表明，500μmol CO2·mol^-1使红松和长白松土壤呼吸速率明显降低，土壤表面CO2浓度升高导致CO2扩散受阻可能是土壤呼吸受到抑制的主要原因．500μmol CO2·mol^-1下两树种土壤表面CO2浓度明显高于对照箱和裸地条件下的CO2浓度，增加幅度在40～150μmol·mol^-1之间；对照箱内长白松土壤表面CO2浓度略高于裸地，差异不显著，红松差异显著500μmol CO2·mol^-1下的长白松土壤全氮及总有机碳含量略高于对照组，差异不显著，红松裸地的碳氮含量明显低于500μmol CO2·mol^-1及对照箱内土壤碳氮含量；500μmol CO2·mol^-1及开顶箱的微环境对地下3cm处土壤温度没有明显影响．The study with open-top chamber showed that at 500 μmol·CO2· mol^-1, the soil respiration rate under Pinus koraiensis and P. sylvestriformis decreased significantly, probably due to the slow diffusion of increased soil surface CO2 concentration. The soil surface CO2 concentration at 500 μmol· CO2 · mol^-1 was significant higher than that in the control chamber and un-chambered field, with an increment of 40- 150 μmol·CO2 · mol^-1. The soil surface CO2 concentration of P. sylvestriformis in the control chamber was higher than that on unchambered field, but the difference was not significant, while a significant difference was observed in P. koraiensis. The total nitrogen and total organic carbon contents in P. sylvestriformis soil at 500 μmol·CO2 · mol ^-1 had no significant difference with those in the control chamber and on unchambered field, while their contents in P. koraiensis soil were significantly lower on unchambered field than those in the control chamber and at 500 μmol·CO2 · mol^-1. Elevated CO2 and the microenvironment of open-top chamber had little effect on the soil temperature at 3 cm depth.

关 键 词：CO2浓度升高 土壤呼吸 土壤表面CO2浓度 

分 类 号：S714.3[农业科学—林学]