Trait complementarity betweenfine roots of Stipa purpurea and their associated arbuscular mycorrhizal fungi along a precipitation gradient in Tibetan alpine steppe Trait complementarity betweenfine roots of Stipa purpurea and their associated arbuscular mycorrhizal fungi along a precipitation gradient in Tibetan alpine steppe

最小化 最大化

Vol16 No.3: 542-547

Title】Trait complementarity betweenfine roots of Stipa purpurea and their associated arbuscular mycorrhizal fungi along a precipitation gradient in Tibetan alpine steppe

Author】ZHANG Jing1; WANG Ping2; XUE Kai3; HAO Yan-bin1; WANG Yan-fen1*; CUI Xiao-yong1*

Addresses】1 College of Life Sciences, University of Chinese Academy of Sciences, Beijing 100049, China; 2 College of Forestry, Beijing Forestry University, Beijing 100083, China; 3 College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China

Corresponding author】WANG Yan-fen; CUI Xiao-yong

Citation】Zhang J, Wang P, Xue K,et al. (2019) Trait complementarity betweenfine roots of Stipa purpurea and their associated arbuscular mycorrhizal fungi along a precipitation gradient in Tibetan alpine steppe. Journal of Mountain Science 16(3). https://doi.org/10.1007/s11629-018-5311-9

DOI】https://doi.org/10.1007/s11629-018-5311-9

Abstract】Development of fine roots and formation of symbiosis with arbuscular mycorrhizal (AM) fungi represent two strategies for plants to acquire nutrient and water from soil. Here, we elucidatedhow fine root development and symbolized mycorrhizal fungi withStipa purpurearesponded to the precipitation change in Tibetan alpine steppe ecosystemacross a precipitation gradient from 50 mm to 400 mm. As precipitation increased, the proportion of thinner fine roots (diameter < 0.4 mm) in total roots increased significantly; while the mycorrhizal colonization percentage, either associated with thinner or thicker roots, decreased.This phenomenon indicated that fine root development and symbolized mycorrhizal fungi are likely alternative, and plant preferred to develop fine root rather than build a symbiotic relationship with mycorrhizal fungi in more benign niches with higher precipitation. Also, root diameter was negatively correlated with specific root length (SRL), but positively correlated with AM fungal colonization percentage, indicating thicker-root species rely more on mycorrhizal fungi in alpine steppe. The complementarity between fine root and mycorrhizal fungi of S. purpurea is mediated by precipitation in Tibetan alpine steppe.

Keywords】Arbuscular mycorrhizal fungal colonization; Root diameter; Trait complementarity; Precipitation; Stipa purpurea;Alpine steppe