Shifting of the first-order root foraging strategies of Chinese fir (Cunninghamia lanceolata) under varied environmental conditions.
Shifting of the first-order root foraging strategies of Chinese fir (Cunninghamia lanceolata) under varied environmental conditions.
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DOI：
10.1007/s00468-023-02394-5
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发表时间：
2023
期刊：
影响因子：
--
通讯作者：
Rongzhen Huang
中科院分区：
文献类型：
--
作者：
Yingchun Liao;Houbao Fan;Xiaohua Wei;Huiming Wang;Fangfang Shen;Liang Hu;Yanyan Li;Huanying Fang;Rongzhen Huang
Fine roots are critical for soil resource acquisition by trees. Understanding root traits and their responses to varied.environmental conditions is crucial for root resource foraging under environmental alternations. Data on eight first-order.root traits including branching ratio, root diameter (RD), specific root length (SRL), specific root area (SRA), root tissue.density (RTD), root carbon (C) concentration, root nitrogen (N) concentration, and arbuscular mycorrhizal colonization of.roots (AM colonization) were collected along a large environmental gradient to quantify relationships between first-order.root traits and environmental contributing factors in Chinese fir (Cunninghamia lanceolata) plantations of Subtropical China..High mean annual precipitation (MAP) significantly increased AM colonization but decreased root C concentration, resulting.in shifting towards a conservative foraging strategy of the first-order roots. Soil pH showed positive correlations with.AM colonization and root N concentration, but negative correlations with the branching ratio (number of first-order roots/.second-order roots), indicating shifting towards an acquisitive foraging strategy when soil becomes more acidic. However,.increased soil C: N and soil P resulted in lower root N, lower RTD, and thicker root diameter of the first-order roots. Our.study provides evidence that harsh environmental conditions such as drought and acidity resulted in the growth of more.root tips (first-order roots), consequently shifting towards an acquisitive foraging strategy. In contrast, locations with more.abundant rainfall and more neutral and fertile soils caused thicker and fewer root tips with higher AM colonization, shifting.towards a conservative foraging strategy.
