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水分胁迫和接种菌根真菌对青冈栎根系形态的影响

张中峰1,2,张金池3,黄玉清2,郭晓平3,杨慧1,邓艳1**   

  1. (1国土资源部岩溶生态系统与石漠化治理重点实验室、国土资源部/广西岩溶动力学重点实验室(中国地质科学院岩溶地质研究所), 广西桂林 541004; 2广西喀斯特植物保育与恢复生态学重点实验室(广西壮族自治区/中国科学院广西植物研究所), 广西桂林 541006; 3南京林业大学森林资源与环境学院, 南京 210037)
  • 出版日期:2015-05-10 发布日期:2015-05-10

Effects of water stress and mycorrhizal fungi on root morphology of Cyclobalanopsis glauca seedlings.

ZHANG Zhong-feng1,2, ZHANG Jin-chi3, HUANG Yu-qing2, GUO Xiao-ping3, YANG Hui1, DENG Yan1**   

  1. (1Key Laboratory of Karst Ecosystem and Rocky Desertification Control, Ministry of Land and Resources; Karst Dynamics Laboratory, Ministry of Land and Resources/Guangxi Autonomous Region, Institute of Karst Geology, Chinese Academy of Geological Sciences, Guilin 541004, Guangxi, China; 2
    Guangxi Key Laborotary of Plant Conservation and Restoration Ecology in Karst Region, Guangxi Institute of Botany, Guangxi Zhuangzu Autonomous Region and  Chinese Academy of Sciences, Guilin 541006, China; 3 College of Forest Resources and Environment, Nanjing Forestry University, Nanjing 210037, China)
  • Online:2015-05-10 Published:2015-05-10

摘要:

以石漠化地区造林树种青冈栎幼苗为试验材料,在盆栽条件下,分别用内生菌根真菌摩西球囊霉(Glomus mosseae,Gm)、根内球囊霉(Glomus intraradices,Gi)、外生菌根真菌彩色豆马勃(Pisolithus tinctorius,Pt)和3种菌根真菌混合菌剂进行接种,利用根系扫描仪Epson Perfection V700和根系分析软件WinRhizo,研究了正常水分、中度干旱和重度干旱条件下菌根真菌对青冈栎幼苗根系形态的影响。结果表明:在土壤干旱条件下,接种菌根真菌使青冈栎根系生物量、总根长、根表面积和根体积显著增加,使根平均直径减小;在土壤中度干旱胁迫下,Pt处理根表面积显著高于Gm和Gi处理,而根平均直径显著小于Gm和Gi;在重度干旱胁迫下,Pt处理根生物量和根体积显著小于Gm和Gi,根平均直径显著大于Gm和Gi;相关性分析表明,菌根侵染率与根生物量和总根长呈极显著正相关。本研究表明,在干旱条件下,菌根真菌可改变青冈栎幼苗根系形态,促进碳水化合物向根系积累和分配。
 

关键词: CH4, 稻麦轮作系统, 综合温室效应, 陈化生物炭, 温室气体强度, N2O

Abstract: Cyclobalanopsis glauca is a common afforestation species in the karst rocky desertified region of Southwest China. We used two arbuscular mycorrhizal fungi Glomus mosseae (Gm) and Glomus intraradices (Gi), an ectomycorrhizal fungus Pisolithus tinctorius (Pt), and mixed mycorrhizal fungi to inoculate C. glauca seedlings. The seedlings were maintained under three soilwater conditions: well watered, moderate drought, and serious drought. Then, the root scanner Epson Perfection V700 and root analysis software WinRhizo were used to measure root morphological indexes, in order to study the effects of mycorrhizae and drought stress on the C. glauca seedlings. The results showed that under the two conditions of drought stress, root biomass, total root length, root surface area, and root volume of the inoculated seedlings were significantly improved, while average root diameter decreased significantly. Under moderate drought stress, root surface area of the seedlings treated with Pt was significantly higher than that of the seedlings treated with Gm or Gi, while the average root diameter of the seedlings treated with Pt was smaller than that of the seedlings treated with Gm or Gi. However, under severe drought stress, root biomass and root volume of the seedlings treated with Pt were significantly lower than those of the seedlings treated with Gm or Gi, while average root diameter of the seedlings treated with Pt was significantly larger than that of the seedlings treated with Gm or Gi. The correlation of mycorrhizal infection rate with root biomass and total root length was positive. This experiment suggests that the root morphology of C. glauca seedlings was changed by the mycorrhizal fungi, which promoted the accumulation and allocation of carbohydrates to the roots of C. glauca under conditions of drought stress.

Key words: CH4, global warming potential, rice-wheat rotation system, greenhouse gas intensity, N2O, aged-biochar