增温和CO_2浓度加倍对川西亚高山针叶林土壤可溶性有机碳、氮的影响  

Effects of elevated temperature and doubled CO_2 concentration on soil dissolved organic carbon and nitrogen in a subalpine coniferous forest of western Sichuan,Southwest China

作　　者：刘芙蓉[1,2] 王红梅[1,2] 张咏梅[1] 

机构地区：[1]中国科学院成都生物研究所,成都610041 [2]中国科学院大学,北京100049

出　　处：《生态学杂志》2013年第11期2844-2849,共6页Chinese Journal of Ecology

基　　金：国家自然科学基金项目(30972345;31100383)资助

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0～15cm层DOC的作用大于15～30em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254nm处紫外吸光度值（UVA：254nm）之间呈显著正相关，表明可用UVA值推测川西亚高山针叶林土壤溶液DOC和DON浓度。By using a fully automated microclimate-controlled artificial climate simulation system, this paper studied the effects of elevated temperate （ET） and doubled CO2 concentration （EC） on the soil dissolved organic matter in a subalpine coniferous forest of western Siehuan. 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 em than in 15-30 cm layer. The soil dissolved or-ganic 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 （ UVAzs4 nm ） ＇ indicating that UVA254 nm could be used to speculate the soil DOC and DON contents in subalpine coniferous forest of western Sichuan.

关 键 词：增温 增CO2 可溶性有机碳 可溶性有机氮 紫外吸光度 

分 类 号：S714[农业科学—林学]