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接种菌根真菌对青冈栎水分吸收的贡献

张中峰1*,张金池2,徐广平1,周龙武1,李艳琼1   

  1. 1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;2江苏省水土保持与生态修复重点实验室, 南京林业大学林学院, 南京 210037)
  • 出版日期:2018-08-10 发布日期:2018-08-10

Contribution of arbuscular mycorrhizal fungi to water absorption by Cyclobalanopsis glauca.

ZHANG Zhong-feng1*, ZHANG Jin-chi2, XU Guang-ping1, ZHOU Long-wu1, LI Yan-qiong1   

  1. (1Guangxi Key Laboratory of Plant Conservation and Restoration Ecology in Karst Terrain, Guangxi Institute of Botany, Guangxi Zhuangzu Autonomous Region and Chinese Academy of Sciences, Guilin 541006, Guangxi, China; 2Jiangsu Province Key Laboratory of Soil and Water Conservation and Ecological Restoration, College of Forestry, Nanjing Forestry University, Nanjing 210037, China).
     
  • Online:2018-08-10 Published:2018-08-10

摘要: 为揭示丛枝菌根真菌对喀斯特地区植物水分吸收的贡献,用摩西管柄囊霉(Funneliformis mosseae)和根内根孢囊霉(Rhizophagus intraradices)接种青冈栎(Cyclobalanopsis glauca)幼苗,利用根系分室装置,使相邻青冈栎之间仅通过菌根菌丝网络连接,用稳定氢同位素作为标记物,估算菌根网络对青冈栎幼苗水分传输的贡献。结果表明,青冈栎根外菌丝可延伸至根外10~15 cm,根际土壤中氢稳定同位素丰度与菌丝密度呈显著正相关。在土壤干旱期间,相邻青冈栎植株之间能够通过菌根网络输导水分。利用混合线性模型公式估算菌根网络水分输送贡献,结果显示,受体室青冈栎植株水分中约1.7%~2.2%是通过菌丝传输作用从供体室吸收,这对于生长在土层浅薄且存在地质性干旱的喀斯特地区植物而言具有积极作用。

Abstract: To examine the contribution of mycorrhizal networks to plant water uptake in karst areas, Cyclobalanopsis glauca seedlings, the main afforestation species in karst areas, were inoculated with mixed Funneliformis mosseae and Rhizophagus intraradices. A root compartmentalization system was used to control the connection between C. glauca seedlings, with adjacent plantsbeing connected only through mycorrhizal networks. Stable hydrogen isotope abundance was used to trace water transport between the mycorrhizal networks and C. glauca seedlings. Our results showed that the density of mycelium decreased with increasing distance from plant roots; the mycelium around C. glauca roots could be found even at a distance of 10-15 cm. There was a significantly positive correlation between hydrogen isotope abundance and mycelial density in the rhizosphere soil. During drought stage, C. glauca seedlings absorbed water via hydraulic lift, with water being transported between adjacent seedlings through the mycorrhizal networks. The contribution of mycorrhizal networks to water transport was estimated using a mixed linear model. The results showed that 1.7%-2.2% of water in the receptor chamber of seedlings was absorbed from the soil of donor chamber by the mycorrhizal networks. The results indicated that water transport by mycorrhizal networks is important for plants with shallow roots in the karst area during the dry season.