石质陡坡条件下红松和樟子松的细根适应策略

doi:10.13287/j.1001-9332.202605.004

摘要/Abstract

摘要： 为提升石质陡坡生态修复的成效与树种选择的科学性,本研究以14年生红松和樟子松幼龄林为研究对象,分析石质陡坡修复下红松与樟子松细根的适应策略。结果表明:在非石质缓坡的正常立地下,拓扑指数(TI)在红松(0.69)与樟子松(0.73)间无显著差异。在石质陡坡上,红松细根拓扑指数显著降低(TI=0.63),呈叉状分支;樟子松拓扑指数显著升高(TI=0.79),分支结构趋近鱼尾型。正常立地下,红松与樟子松的形态差异显著,红松细根平均直径为樟子松的1.6倍,比根长和根比表面积仅为樟子松的1/3和1/2;在石质陡坡上,红松1～3级细根平均直径和比根长显著增加,组织密度显著下降,而樟子松则相反。与正常立地相比,石质陡坡下樟子松1~3级细根碳含量和碳氮比显著升高,氮含量显著降低,而红松变化趋势相反;红松菌根侵染率在石质陡坡下显著升高25.0%,樟子松则显著降低32.3%。红松通过增强细根叉状分支,提高菌根共生来提升资源获取;樟子松则通过显著简化细根分支结构、增强组织防御来适应胁迫。两种树种均适用于石质陡坡的生态修复。

关键词: 石质陡坡, 细根, 拓扑结构, 化学计量比, 菌根侵染率, 环境适应

Abstract: To improve the effectiveness of ecological restoration of rocky steep slopes and the scientific selection of tree species, we analyzed the adaptation strategies of fine roots of 14-year-old young plantations of Pinus koraiensis and P. sylvestris var. mongolica under the rocky steep slope restoration. The results showed that under non-rocky gentle normal conditions, there was no difference in the topological indices (TI) between P. koraiensis (0.69) and P. sylvestris var. mongolica (0.73). On rocky steep slopes, the topological indice of P. koraiensis fine root significantly decreased (TI=0.63), showing dichotomous branching, whereas that of P. sylvestris var. mongolica significantly increased (TI=0.79), with branching structure approaching a herringbone pattern. Under normal conditions, there were significant morphological differences between the two species. The average fine root diameter of P. koraiensis was 1.6 times that of P. sylvestris var. mongolica, while its specific root length and specific root surface area were only one-third and one-half that of P. sylvestris var. mongolica, respectively. Under rocky steep slope conditions, the average diameter and specific root length of 1st-3rd order roots significantly increased while tissue density significantly decreased in P. koraiensis, whereas P. sylvestris var. mongolica showed opposite trends. Compared with those under normal conditions, P. sylvestris var. mongolica on rocky steep slopes exhibited significantly increased carbon content and C:N but significantly decreased nitrogen content in its 1st-3rd order fine roots, while P. koraiensis showed an opposite trend. The mycorrhizal colonization rate significantly increased by 25.0% in P. koraiensis but decreased by 32.3% in P. sylvestris var. mongolica on rocky steep slopes. P. koraiensis enhanced resource acquisition through increasing fine root dichotomous branching and mycorrhizal symbiosis, whereas P. sylvestris var. mongolica adapted via simplifying branching structure of fine roots and enhancing tissue defense. Both species were suitable for ecological restoration on rocky steep slopes.

Key words: rocky steep slope, fine root, topological structure, stoichiometric ratio, mycorrhizal colonization rate, environmental adaptation

黄波, 杨立学, 李凡, 董慧, 郝景祥. 石质陡坡条件下红松和樟子松的细根适应策略[J]. 应用生态学报, 2026, 37(5): 1422-1430.

HUANG Bo, YANG Lixue, LI Fan, DONG Hui, HAO Jingxiang. Fine root adaptation strategies of Pinus koraiensis and P. sylvestris var. mongolica under rocky steep slope conditions.[J]. Chinese Journal of Applied Ecology, 2026, 37(5): 1422-1430.

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