氮素添加对外生菌根和丛枝菌根人工林细根养分获取策略的不同影响——以马尾松和杉木为例

IF 3.9 2区 农林科学 Q1 AGRONOMY
Jing Wu, Xiaoxiang Zhao, Taidong Zhang, Shuai Ouyang, Liang Chen, Yelin Zeng, Huili Wu, Wenhua Xiang
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引用次数: 0

摘要

与外生菌根(ECM)和丛枝菌根(AM)相关的aimstreet物种表现出不同的营养获取策略。然而,不同氮添加量对ECM和AM物种细根养分获取策略的影响尚未完全阐明。方法对马尾松(Pinus massoniana, ECM)和杉木(Cunninghamia lanceolata, AM)人工林在5个不同施氮水平(0、25、50、100和200 kg N ha−1 yr−1)下16年的细根性状、菌根定植率和根际酶活性进行了研究。结果马尾松(Pinus massoniana, ECM)细根生物量随施氮量的增加呈先增加后下降的趋势,杉木(Cunninghamia lanceolata, AM)细根生物量呈连续增加趋势。马尾松比根长(SRL)和比根面积(SRA)随N浓度的增加变化不显著,而杉木比根长和比根面积(SRA)随N浓度的增加先增大后减小。两种植物的菌根定殖率均随施氮量的增加而降低。此外,马尾松根际细胞外酶活性在高氮水平下升高,而杉木根际细胞外酶活性在低氮水平下升高。结论随着N添加量的增加,杉木细根从优先考虑营养物质的寻找效率(通过SRL)向优先考虑营养物质的寻找数量(通过生物量)转变,马尾松细根从最初依赖细根生物量和菌根关联向最终向寻找效率和与菌根脱钩转变。我们的研究结果增强了对植物-土壤相互作用的认识,并为氮沉降下的森林管理提供了有意义的信息。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Nitrogen addition shifts fine root nutrient-acquisition strategies differently in ectomycorrhizal and arbuscular mycorrhizal plantations: A case study of Pinus massoniana and Cunninghamia lanceolata

Aims

Tree species associated with ectomycorrhizal (ECM) and arbuscular mycorrhiza (AM) exhibit distinct strategies for nutrient acquisition. However, the effects of varying nitrogen (N) additions on the nutrient-acquisition strategies of fine roots in ECM and AM species have not been fully elucidated.

Methods

We investigated fine root traits, mycorrhizal colonization rates, and rhizosphere enzyme activity in Pinus massoniana (ECM) and Cunninghamia lanceolata (AM) plantations at 16-year-old under five levels of N addition (0, 25, 50, 100 and 200 kg N ha−1 yr−1).

Results

The fine root biomass of Pinus massoniana (ECM) initially increased and then declined with increasing N additions, whereas that of Cunninghamia lanceolata (AM) exhibited a continuous increase. The specific root length (SRL) and root area (SRA) of P. massoniana did not significantly change with increasing levels of N, while those in C. lanceolata increased initially and then decreased. For both species, the mycorrhizal colonization rate decreased as the level of N addition increased. Furthermore, rhizosphere extracellular enzyme activity in P. massoniana increased at high N levels, while that in C. lanceolata increased at low N levels.

Conclusions

With increasing N addition, the fine roots of C. lanceolata shifted from prioritizing nutrient exploration efficiency (via SRL) to nutrient exploration quantity (via biomass), while the fine roots of P. massoniana initially relied on fine root biomass and mycorrhizal associations, eventually transitioning to exploration efficiency and a decoupling from mycorrhiza. Our findings enhance understanding of plant-soil interactions and provide insightful information for forest management under N deposition.

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来源期刊
Plant and Soil
Plant and Soil 农林科学-农艺学
CiteScore
8.20
自引率
8.20%
发文量
543
审稿时长
2.5 months
期刊介绍: Plant and Soil publishes original papers and review articles exploring the interface of plant biology and soil sciences, and that enhance our mechanistic understanding of plant-soil interactions. We focus on the interface of plant biology and soil sciences, and seek those manuscripts with a strong mechanistic component which develop and test hypotheses aimed at understanding underlying mechanisms of plant-soil interactions. Manuscripts can include both fundamental and applied aspects of mineral nutrition, plant water relations, symbiotic and pathogenic plant-microbe interactions, root anatomy and morphology, soil biology, ecology, agrochemistry and agrophysics, as long as they are hypothesis-driven and enhance our mechanistic understanding. Articles including a major molecular or modelling component also fall within the scope of the journal. All contributions appear in the English language, with consistent spelling, using either American or British English.
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