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不同海拔百山祖冷杉细根性状及微生物群落组成
Traits of fine roots and composition of microbial communities of Abies beshanzuensis at different altitudes
【摘要】 研究植物性状及与植物密切相关的微生物群落沿海拔的变异,有助于理解个体对环境变化的适应能力。以生存于不同海拔高度的极小种群野生植物百山祖冷杉(Abies beshanzuensis)成年个体(海拔951、1 400和1 590 m处为人工培育实生苗;海拔1750m处为野生成年个体)为研究对象,利用根系扫描仪测定百山祖冷杉细根性状,利用高通量测序技术分析百山祖冷杉根际土壤及根内微生物(细菌及真菌)群落组成,探究根际土壤及根内微生物群落和细根性状在不同海拔高度的差异。结果表明:不同海拔高度的百山祖冷杉周围土壤养分有效性较差,理化性质除铵态氮含量和pH值外均存在显著差异(P<0.05)。根际土壤及根内真菌和细菌群落沿海拔变异明显。为适应土壤生物及非生物因子沿海拔的变化,百山祖冷杉采取不同的细根营养策略;细根具有高度可塑性,与外生菌根真菌产生协同效应缓解了百山祖冷杉受到的生存限制。
【Abstract】 Studies on the variation of plant traits and plant-associated microbiomes at different altitudes will contribute to understanding the adaptation of plants to climate change. In this study, we selected three extant adults of A. beshanzuensis at 1 750 m and other adults from artificially cultivated seedlings at different altitudes(951, 1 400, and 1 590 m), and investigated their differences in root traits and microbial community compositions in the rhizosphere soil and roots. We used a root scanner and high-throughput sequencing to explore these differences at different altitudes. The main results were as follows: the nutrient availability around A. beshanzuensis was low. There were significant differences in physicochemical properties at different altitudes, except in ammonium nitrogen and pH value(P<0.05). The fungal and bacterial communities in the rhizosphere soil and roots at different altitudes have obvious variance. In order to adapt to the variation in soil biotic and abiotic factors across altitudes, A. beshanzuensis adopted different fine root foraging strategies. The fine roots of A. beshanzuensis showed high plasticity and could effectively cooperate with ECM fungi to increase fitness.
【Key words】 Abies beshanzuensis; altitudinal gradient; fine root traits; microbial community composition; plant-microbiome interactions;
- 【文献出处】 森林与环境学报 ,Journal of Forest and Environment , 编辑部邮箱 ,2023年01期
- 【分类号】S791.14
- 【下载频次】40