不同水位泥炭地铁、铝矿物复合体及有机碳形态分布特征  

Distribution characteristics of iron and aluminum mineral complexes and organic carbon forms in peatlands with different water levels

作　　者：付玮 陈槐[3,4] 王尹佳 刘建亮[3,4] 白银萍[2] 黄鑫 杨刚 FU Wei;CHEN Huai;WANG Yinjia;LIU Jianliang;BAI Yinping;HUANG Xin;YANG Gang(School of Life Sciences and Engineering,Southwest University of Science and Technology,Mianyang 621000,China;School of Environmental Science and Engineering,Shaanxi University of Science and Technology,Xi′an 710069,China;Zoige Wetland Ecosystem Research Station,Chinese Academy of Sciences,Hongyuan 624400,China;Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization,Chengdu Institute of Biology,Chengdu 610041,China)

机构地区：[1]西南科技大学生命科学与工程学院,绵阳621000 [2]陕西科技大学环境科学与工程学院,西安710069 [3]中国科学院四川若尔盖湿地生态研究站,红原624400 [4]中国科学院成都生物研究所山地生态恢复与生物资源利用重点实验室,成都610041

出　　处：《生态学报》2025年第5期2200-2208,共9页Acta Ecologica Sinica

基　　金：国家自然科学基金项目(42430715,42077038);四川省自然科学基金项目(2023NSFSC0758)。

摘　　要：铁铝矿物影响着土壤有机碳稳定性和积累。为评估不同水位泥炭地中不同形态铁铝矿物复合体对有机碳积累和稳定性的影响,以红原县三处不同水位泥炭地(泥炭沼泽:S1(-1.9cm)、沼泽草甸:S2(-10cm)、高寒草甸:S3(-19cm))为研究对象。采用选择性提取法测定泥炭地中晶质金属氧化物(DH)、短程有序矿物(HH)、有机金属络合物(PP)的碳和铁铝含量。结果表明,提取剂提取的碳含量及其占有机碳的百分比在各泥炭地中均表现为PP>DH>HH。总铁铝结合碳、PP提取的碳含量在S3中最高,S1最低,这种显著差异主要表现在表层土中。提取的金属(Al+Fe)含量在各泥炭地中均表现为:PP>DH>HH,且C/M均大于1,说明铁铝矿物以共沉淀和络合作用与有机碳结合形成有机金属络合物主导着泥炭地中有机碳的积累,并且主要表现在土壤表层和亚表层,而晶体铁铝和短程有序铁铝矿物与有机碳的相互作用积累效应较弱,并且这种差异在S3的表层和亚表层土壤中更加显著。相关分析表明,S1中有机碳的积累受晶质铁铝矿物与有机碳相互作用和有机金属络合物驱动;S2中有机碳的积累仅受到有机金属络合物的驱动;铁铝矿物对S3中有机碳的积累没有决定性作用。可见,泥炭地不同水位对矿物与有机碳结合方式及有机碳分布有显著影响,且有机金属络合物含量的增加在一定程度上驱动泥炭地有机碳的稳定和积累。鉴于泥炭地在全球碳循环中的关键作用,研究结论对矿物与有机物相互作用如何响应水位变化,预测湿地生态系统中的碳储存动态至关重要。Iron and aluminum minerals influence the stability and sequestration of soil organic carbon.To assess the effects of various forms of iron and aluminum mineral complexes on the accumulation and stability of organic carbon in peatlands across varying water levels,this study focused on three peatlands in Hongyuan County with distinct water levels:peat swamp(S1,-1.9cm),swamp meadow(S2,-10cm),and alpine meadow(S3,-19cm).The carbon and iron⁃aluminum contents within crystalline metal oxides(DH),short⁃range ordered minerals(HH),and organometallic complexes(PP)in the peatlands were ascertained using the selective extraction method.The results showed that the carbon contents extracted by the different extractants and their proportions relative to the total organic carbon followed the sequence PP>DH>HH in each peatland.The total carbon bound to iron⁃aluminum and the carbon content extracted by PP peaked in S3 and reached the minimum in S1,with this notable difference primarily evident in the topsoil.The contents of the extracted metals(Al+Fe)in each peatland were in the order of PP>DH>HH,and the C/M ratios were all greater than 1.This finding indicated that iron and aluminum minerals primarily interacted with soil organic carbon through coprecipitation and complexation,forming organometallic complexes that dominated soil organic carbon accumulation in peatlands.This effect was most pronounced in the surface and subsurface soil layers.In contrast,the interaction and accumulation effects of crystalline iron⁃aluminum minerals and short⁃range ordered iron⁃aluminum minerals with soil organic carbon were relatively weak.This difference was particularly evident in the surface and subsurface soils of S3,where organometallic complexes played a more significant role in soil organic carbon stabilization and accumulation.The correlation analysis revealed that the accumulation of organic carbon in S1 was influenced by the interactions among crystalline iron⁃aluminum minerals,organic carbon,and organometallic complexes;the

关 键 词：泥炭地 水位 有机碳稳定性 选择性溶解 铁铝矿物 

分 类 号：G63[文化科学—教育学]