土壤矿物与生物炭可溶性组分的交互作用及机制  

Mechanisms of interactions between soil minerals and dissolvable biochar components

作　　者：秦晶晶 刘玉学[2,3,4] 何莉莉 汪玉瑛 吕豪豪[2,3] 陈立天 杨生茂[1,2,3] QIN Jingjing;LIU Yuxue;HE Lili;WANG Yuying;LÜHaohao;CHEN Litian;YANG Shengmao(College of Chemistry and Life Sciences,Zhejiang Normal University,Jinhua 321000,China;Institute of Environment,Resource,Soil and Fertilizer,Zhejiang Academy of Agricultural Sciences,Hangzhou 310021,China;Engineering Research Center of Biochar of Zhejiang Province,Hangzhou 310021,China;College of Environmental and Resource Sciences,Zhejiang A&F University,Hangzhou 311300,China)

机构地区：[1]浙江师范大学化学与生命科学学院,浙江金华321000 [2]浙江省农业科学院环境资源与土壤肥料研究所,杭州310021 [3]浙江省生物炭工程技术研究中心,杭州310021 [4]浙江农林大学环境与资源学院,杭州311300

出　　处：《农业环境科学学报》2022年第7期1490-1500,共11页Journal of Agro-Environment Science

基　　金：国家自然科学基金项目(42077090);浙江省自然科学基金项目(LY20D010005)。

摘　　要：为探究生物炭可溶性组分与土壤矿物的交互作用,进而从矿物角度揭示生物炭在土壤中的稳定机制,以水稻秸秆为生物质原料制备不同炭化温度的生物炭(RS300、RS500和RS700),选用高岭石、蒙脱石和伊利石3种土壤矿物,开展土壤矿物与生物炭可溶性组分的吸附结合实验。结果表明:随生物炭可溶性组分碳浓度的升高,土壤矿物对其吸附量逐渐增加,3种土壤矿物的吸附量顺序总体为蒙脱石>伊利石>高岭石,这与土壤矿物的自身结构直接相关。高岭石、蒙脱石对生物炭可溶性组分的结合机制以范德华力为主,其贡献比例分别为3.4%-87.0%和32.0%-82.0%;而伊利石与RS300可溶性组分的吸附结合作用以Ca^(2+)架桥为主(贡献比例为60.4%-70.6%),与RS500和RS700可溶性组分的结合以范德华力为主(贡献比例分别为18.7%-65.0%和53.0%-67.6%)。经综合对比分析,RS500通过与蒙脱石的交互结合,最大程度上抑制了可溶性组分的溶解,有利于更好地发挥生物炭的固碳减排优势。The interactions between dissolvable biochar components and soil minerals were explored from the perspective of minerals to reveal the mechanism of biochar stability in soil. Batch experiments on the adsorption of dissolvable biochar components by soil minerals were carried out. Biochar was prepared from rice straw under different carbonization temperatures(RS300, RS500, and RS700). Kaolinite,montmorillonite, and illite were selected as three representative soil minerals. The results showed that the adsorption capacity of soil minerals gradually increased as the carbon concentration of dissolvable biochar components increased. The order of adsorption capacity of the three soil minerals, montmorillonite>illite>kaolinite, was related directly to their structures. The proportions by which each mechanism contributed to the stability of the representative soil minerals also differed. The binding mechanisms of both kaolinite and montmorillonite to the dissolvable biochar components, whose contribution proportions were 3.4%-87.0% and 32.0%-82.0%, respectively, were a result of the van der Waals force. The binding of illite to the dissolvable components of RS300 was primarily conducted by Ca^(2+), at a contribution ratio of 60.4%-70.6%;its binding to RS500 and RS700, with contribution ratios of 18.7%-65.0% and 53.0%-67.6%, respectively, was a result of the van der Waals force. Comprehensive comparative analysis shows that RS500 can inhibit the dissolution of dissolvable components to the greatest extent by interactive combination with montmorillonite, which is conducive to utilizing the carbon sequestration and emissions reduction advantages of biochar.

关 键 词：生物炭 高岭石 蒙脱石 伊利石 吸附 固碳 

分 类 号：S156[农业科学—土壤学] X14[农业科学—农业基础科学]