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袁晖, 何显平, 兰立达, 李德文. 大气CO2浓度和温度升高对紫花苜蓿生物量及其分配的影响[J]. 四川林业科技, 2013, 34(1): 48-51. DOI: 10.16779/j.cnki.1003-5508.2013.01.011
引用本文: 袁晖, 何显平, 兰立达, 李德文. 大气CO2浓度和温度升高对紫花苜蓿生物量及其分配的影响[J]. 四川林业科技, 2013, 34(1): 48-51. DOI: 10.16779/j.cnki.1003-5508.2013.01.011
YUAN Hui, HE Xian-ping, LAN Li-da, LI De-wen. Effects of Elevated CO2 Concentration and Temperature on the Biomass and its Allocation of Medicago sativa[J]. Journal of Sichuan Forestry Science and Technology, 2013, 34(1): 48-51. DOI: 10.16779/j.cnki.1003-5508.2013.01.011
Citation: YUAN Hui, HE Xian-ping, LAN Li-da, LI De-wen. Effects of Elevated CO2 Concentration and Temperature on the Biomass and its Allocation of Medicago sativa[J]. Journal of Sichuan Forestry Science and Technology, 2013, 34(1): 48-51. DOI: 10.16779/j.cnki.1003-5508.2013.01.011

大气CO2浓度和温度升高对紫花苜蓿生物量及其分配的影响

Effects of Elevated CO2 Concentration and Temperature on the Biomass and its Allocation of Medicago sativa

  • 摘要: 本文利用封闭式生长室系统,研究了环境CO2浓度和温度(对照处理,CON)、CO2浓度升高(环境CO2浓度加倍,EC)、温度升高(环境温度+2.2℃,ET)以及二者同时升高(ECT)对紫花苜蓿生物量积累及其分配的影响。结果表明,CO2浓度升高增加了紫花苜蓿根、茎、叶和总生物量的累积。温度升高仅增加了叶、茎和总生物量,对根生物量的累积无显著影响。在温度升高条件下,CO2浓度升高对紫花苜蓿的根、茎、叶和总生物量的累积效应更多。单独CO2浓度、温度升高以及二者交互作用显著降低了根冠比与地下生物量,显著提高了源汇比和利用率。

     

    Abstract: In this paper, with enclosed chamber system, Medicago sativa seedlings were exposed to two CO2 concentrations levels (ambient and double ambient CO2 concentration), two temperature levels (ambient and + 2.2℃) and their combination for one growth season in order to research on its biomass accumulation and biomass allocation. The results showed that elevated CO2 significantly increased the accumulation of root, stem and leaf biomasses and total biomass. And elevated temperature increased the leaf and stem biomasses and total biomass, but had no obvious effect on the root-biomass. Elevated temperature had positive effect on the accumulation of root, stem, leaf and total biomass under elevated CO2. The combination of elevated CO2 and temperature increased Wsource/Wsink and available biomass, but decreased R/S and root biomass.

     

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