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首页> 外文期刊>Biogeosciences >Biological enhancement of mineral weathering by Pinus sylvestris seedlings - effects of plants, ectomycorrhizal fungi, and elevated CO2
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Biological enhancement of mineral weathering by Pinus sylvestris seedlings - effects of plants, ectomycorrhizal fungi, and elevated CO2

机译：Pinus sylvestris幼苗的矿物风化的生物学增强 - 植物，植物癌真菌和升高的二氧化碳的影响

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摘要

Better understanding and quantifying the relative influence of plants, associated mycorrhizal fungi, and abiotic factors such as elevated CO2 on biotic weathering is essential to constraining weathering estimates. We employed a column microcosm system to examine the effects of elevated CO2 and Pinus sylvestris seedlings, with or without the ectomycorrhizal fungi Piloderma fallax and Suillus variegatus, on rhizosphere soil solution concentrations of low-molecular-weight organic acids (LMWOAs) and on the weathering of primary minerals. Seedlings significantly increased mineral weathering, as estimated from elemental budgets of Ca, K, Mg, and Si. Elevated CO2 increased plant growth and LMWOA concentrations but had no effect on weathering. Colonization by ectomycorrhizal fungi, particularly P. fallax, showed some tendency to increase weathering. LM-WOA concentrations correlated with seedling biomass across both CO2 and mycorrhizal treatments but not with total weathering. We conclude that nutrient uptake, which reduces transport limitation to weathering, is the primary mechanism by which plants enhanced weathering in this system. While the experimental system used departs from conditions in forest soils in a number of ways, these results are in line with weathering studies performed at the ecosystem, macrocosm, and microcosm scale, indicating that nutrient uptake by plants and microbes is an important biological mechanism by which mineral weathering is enhanced.
机译：更好地理解和量化植物，相关的菌根真菌和非生物因子（如升高的二氧化碳）对生物风化的相对影响，对于限制风化估计是必不可少的。我们使用柱微型药物系统来检查升高的二氧化碳和松树Sylvestris幼苗的影响，有或没有突出的菌毒性真菌piloderma Residax和Suillus Variegatus，对低分子量有机酸（LMWoas）和耐候物质的根际土壤溶液浓度主要矿物质。幼苗显着增加矿物风化，估计来自Ca，K，Mg和Si的元素预算。升高的二氧化碳增加了植物生长和LMWOA浓度，但对风化没有影响。 Ececycorrhizal真菌的定植，特别是P. Realsax，显示出一些增加风化的趋势。 LM-WOA浓度与二氧化碳和菌根治疗的幼苗生物量相关，但没有耐候性。我们得出结论，营养吸收降低了对风化的运输限制，是植物在该系统中增强风化的主要机理。虽然所用的实验系统以多种方式从森林土壤中脱离森林土壤的条件，但这些结果符合生态系统，宏观和微观尺度的风化研究，表明植物和微生物的营养吸收是一种重要的生物机制哪种矿化风化增强了。

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