【摘要】 采用全自动微气候控制的"人工模拟气候实验系统",研究了增温和CO2浓度加倍对川西亚高山针叶林土壤可溶性有机碳(DOC)和氮(DON)的影响。结果表明:(1)增温(ET)、增CO2(EC)及两者的交互作用(ETC)均增加了DOC含量,增加强度为EC>ET>ETC>CK,各处理对土壤0~15 cm层DOC的作用大于15~30 cm层。(2)ET、EC和ETC对DON的影响与DOC相似。(3)不同土层DOC/DON差异不显著;EC处理显著降低了DOC/DON。(4)DOC、DON的浓度与土壤溶液在254 nm处紫外吸光度值(UVA254 nm)之间呈显著正相关,表明可用UVA254 nm值推测川西亚高山针叶林土壤溶液DOC和DON浓度。更多还原

【Abstract】 By using a fully automated microclimate-controlled artificial climate simulation system,this paper studied the effects of elevated temperate( ET) and doubled CO2concentration( EC) on the soil dissolved organic matter in a subalpine coniferous forest of western Sichuan.ET,EC,and their interaction( ETC) increased the soil dissolved organic carbon( DOC) content,with the increment being in the order of EC > ET > ETC > CK. The effects of ET,EC,and ETC on the soil DOC was greater in 0- 15 cm than in 15- 30 cm layer. The soil dissolved organic nitrogen( DON) content had the similar variation pattern to the soil DOC. There was no significant difference in the soil DOC / DON between different layers. ET decreased the soil DOC /DON significantly. The soil DOC and DON contents had significant positive correlations with the ultraviolet absorbency value at 254 nm( UVA254 nm),indicating that UVA254 nm could be used to speculate the soil DOC and DON contents in subalpine coniferous forest of western Sichuan.更多还原