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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、氮的影响

刘芙蓉1,2,王红梅1,2,张咏梅1**   

  1. 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)
  • 出版日期:2013-11-10 发布日期:2013-11-10

Effects of elevated temperature and doubled CO2 concentration on soil dissolved organic carbon and nitrogen in a subalpine coniferous forest of western Sichuan, Southwest China. 

LIU Fu-rong1,2, WANG Hong-mei1,2, ZHANG Yong-mei1**   

  1. (1Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China; 2University of Chinese Academy of  Sciences, Beijing 100049, China)
  • Online:2013-11-10 Published:2013-11-10

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。

关键词: 气候响应, 海拔分布上限, 滇西北高原, 大果红杉, 树木年轮

Abstract: 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 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.

Key words: Larix potaninii var. macrocarpa, climatic response, upper distributional limit, dendrochronology, Northwestern Yunnan Plateau.