Assessment of Plant-Driven Mineral Weathering in an Aggrading Forested Watershed in Subtropical China

查看全文 作　　者：ZUO [1,2]Shuangmiao;YANG [1,2]Jinling;HUANG [1,2,3]Laiming;David [1,4]G.ROSSITER;ZHANG [1,2]Ganlin

机构地区：[1]State Key Laboratory of Soil and Sustainable Agriculture,Institute of Soil Science,Chinese Academy of Sciences,Nanjing 210008(China);[2]University of Chinese Academy of Sciences,Beijing 100049(China);[3]Key Laboratory of Ecosystem Network Observation and Modeling,Institute of Geographic Sciences and Natural Resources Research,Chinese Academy of Sciences,Beijing 100101(China);[4]Section of Crop&Soil Sciences,Cornell University,Ithaca NY14853(USA)

出　　处：《Pedosphere》索引2016年第26卷第6期,共12页

基　　金：supported by the National Natural Science Foundation of China(Nos.41471176 and41130530) 摘　　要：Plant growth contributes to mineral weathering,but this contribution remains poorly understood.Weathering rates in an aggrading forested watershed in subtropical China were studied by means of geochemical mass balance.Rainfall,dry deposition,and streamwater were monitored from March 2007 to February 2012.Samples of vegetative components,rainfall,dry deposition,streamwater,representative soils,and parent rock were collected and determined for mass balance calculation and clarifying plant-driven weathering mechanisms stoichiometrically.Ignoring biomass,weathering rates of Ca^(2+),Mg^(2+),Na^+,and Si were 25.6,10.7,2.8,and 51.0 kg ha-1year-1,respectively.Taking biomass into consideration,weathering rates of Ca^(2+),Mg^(2+),and Si and the sum of weathering rates of Ca^(2+),Mg^(2+),Na+,K+,and Si were 2.6,1.8,1.2,and 1.5-fold higher than those ignoring biomass,respectively.This is attributed to plant-driven weathering due to the nutrient(e.g.,Ca^(2+),Mg^(2+),and K^+) absorption by vegetation and substantial proton production during assimilation of these nutrients,with the former acting as a pump for removing weathering products and the latter being a source of weathering agents solubilizing mineral components.The same pattern of weathering,i.e.,higher rates of weathering with than without including biomass in mass balance calculation,was reported in previous studies;however,the extent to which plants drive weathering rates varied with vegetation types and climatic zones.The documented biological weathering driven by plants is expected to play a critical role in regulating nutrient cycling and material ?ows within the Earth's Critical Zone. 关键词：矿物风化设备驱动森林流域亚热带中国加积风化速率植物生长

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Assessment of Plant-Driven Mineral Weathering in an Aggrading Forested Watershed in Subtropical China

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