Linking fine‐root diameter across root orders with climatic, biological and edaphic factors in the Northern Hemisphere

IF 3.1 2区 环境科学与生态学 Q2 ECOLOGY Oikos Pub Date : 2024-09-18 DOI:10.1111/oik.10763
Wei Guo, Cunguo Wang, Ivano Brunner, Qinrong Tang, Junni Wang, Yingtong Zhou, Mai‐He Li
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Abstract

The importance of fine‐root diameter for ecosystem functioning is increasingly recognized, yet much remains to be learned about the variation in fine‐root diameter at large scales. We conducted an analysis of fine‐root diameter for five root orders for 1163 plant species to detect patterns in relation to resource availability (e.g. carbon, nitrogen, water and net primary production (NPP)), stress intensity (e.g. plant/soil biodiversity and soil bulk density) and temperature. First‐ to fourth‐order root diameters showed non‐linear relationships with mean annual temperature (except for first‐order root diameter) and/or with latitude. The diameters of the five root orders decreased with increasing mean annual precipitation, but increased with greater NPP, which was the strongest determinant of fine‐root diameter. Increasing soil biodiversity was associated with decreasing diameters of fourth‐ and fifth‐order roots, while greater plant biodiversity was associated with decreasing diameters of first‐ to third‐order roots. Soil total nitrogen concentration had a positive effect on first‐order root diameter but a negative effect on fourth‐ and fifth‐order root diameters. The patterns reversed for soil total phosphorus concentration. First‐ to third‐order and fifth‐order root diameters increased with greater soil bulk density. Second‐ to fourth‐order root diameters increased with higher soil pH. Overall, the variables related to climatic, biological and edaphic factors explained 44–63% of the total variance in the diameters of the different root orders. The unique patterns of plasticity observed in fine‐root diameter across root orders in response to varying environmental conditions contributes to a diversification of plant strategies for nutrient/water acquisition and transport under climate change.
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将北半球各根系的细根直径与气候、生物和土壤因素联系起来
人们日益认识到细根直径对生态系统功能的重要性,但对大尺度下细根直径的变化仍有许多问题需要了解。我们对 1163 种植物的五个根阶的细根直径进行了分析,以检测与资源可用性(如碳、氮、水和净初级生产力)、胁迫强度(如植物/土壤生物多样性和土壤容重)和温度相关的模式。一阶至四阶根系直径与年平均温度(一阶根系直径除外)和/或纬度呈非线性关系。五阶根的直径随着年平均降水量的增加而减小,但随着净生产力的增加而增大,而净生产力是决定细根直径的最大因素。土壤生物多样性的增加与四阶和五阶根直径的减少有关,而植物生物多样性的增加与一阶至三阶根直径的减少有关。土壤全氮浓度对一阶根直径有正向影响,但对四阶和五阶根直径有负向影响。土壤全磷浓度的影响模式则相反。土壤容重越大,一阶至三阶和五阶根直径越大。土壤 pH 值越高,二阶至四阶根系直径越大。总的来说,与气候、生物和环境因素有关的变量解释了不同根阶直径总变异的 44-63%。不同根序的细根直径在不同环境条件下具有独特的可塑性,这有助于植物在气候变化条件下养分/水分获取和运输策略的多样化。
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来源期刊
Oikos
Oikos 环境科学-生态学
CiteScore
6.20
自引率
5.90%
发文量
152
审稿时长
6-12 weeks
期刊介绍: Oikos publishes original and innovative research on all aspects of ecology, defined as organism-environment interactions at various spatiotemporal scales, so including macroecology and evolutionary ecology. Emphasis is on theoretical and empirical work aimed at generalization and synthesis across taxa, systems and ecological disciplines. Papers can contribute to new developments in ecology by reporting novel theory or critical empirical results, and "synthesis" can include developing new theory, tests of general hypotheses, or bringing together established or emerging areas of ecology. Confirming or extending the established literature, by for example showing results that are novel for a new taxon, or purely applied research, is given low priority.
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