1.云南农业大学 资源与环境学院;2.中国科学院 山地表生过程与生态调控重点实验室，中国科学院、水利部 成都山地灾害与环境研究所;3.中国科学院大学
1.College of Resources and Environment , Yunnan Agricultural University;2.Key Laboratory of Mountain Surface Processes and Ecological Regulation, Chinese Academy of Sciences, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences and ministry of Water Conservancy 3.University of Chinese Academy of Sciences;3.2.Key Laboratory of Mountain Surface Processes and Ecological Regulation, Chinese Academy of Sciences, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences and ministry of Water Conservancy
Supported by the National Natural Science Foundation of China (No.42007002), Yunnan Basic Research Project (No. 202101AT070220)
为了分析研究酸化环境对紫色母岩风化产物交换性盐基离子及其酸缓冲容量的影响规律。本研究以侏罗纪紫色岩层中的遂宁组(J3s)、沙溪庙组(J2s)和蓬莱镇组(J3p)为研究对象，设置pH分别为2.5、3.5、4.5、5.6等4个酸性环境，以及去离子水（pH=7.0）为对照处理（CK），采用循环浸泡试验和模拟淋溶试验，研究酸性环境对紫色母岩风化产物特征的影响。结果表明，通过酸化环境处理后，3组紫色母岩风化产物交换性盐基离子及其总量均随酸化环境的pH降低而减小，且3组紫色母岩风化产物的酸缓冲容量与其交换性K+、Na+、Ca2+、Mg2+含量以及交换性盐基总量均呈极显著正相关关系(P<0.01)。以pH =7.0 (CK)处理为对照，循环浸泡处理后的遂宁组(J3s)、蓬莱镇组(J3p)和沙溪庙组(J2s)风化产物中交换性盐基总量的减小幅度分别为8.75%～18.21%、10.83%～23.18%和5.85%～18.41%。而且模拟淋溶24次后，遂宁组(J3s)、沙溪庙组(J2s)和蓬莱镇组(J3p)风化产物中交换性盐基总量较模拟淋溶12次时分别减小为1.77%～24.85%、8.99%～25.75%和8.05%～25.66%。此外，在同一酸度处理下，风化产物中的交换性盐基离子均表现为Ca2+> Mg2+> Na+> K+。本试验中淋溶处理下风化产物酸缓冲容量、交换性盐基离子及盐基总量低于浸泡处理。可见，丘陵地带坡面的矿物或养分的迁移以淋溶作用为主，平地的矿物或养分的迁移以浸泡作用为主。因此，酸沉降可能在一定程度上加速坡面土壤侵蚀的发生，进而导致平原化进程的加速。
【Objectives】This study aimed to analyze the influence of the acidification environment on weathering products of the typical purple parent rock. The weathering products of purple parent rocks from the Suining Group (J3s), Shaximiao Group (J2s), and Penglaizhen Group (J3p) were investigated under different acidification environments in the laboratory. 【Method】 The acid solutions used for acidification of purple parent rock samples were used to cycle soaking and simulate leaching experiment tests at pHs of 2.5, 3.5, 4.5, and 5.6. In addition, deionized water (pH = 7.0) was set as a control treatment (CK). 【Result】 The results showed that the exchangeable cations and content of total exchangeable cations of weathering products of these purple parent rocks decreased as the acidity of the acidifying solutions increased. The acid buffering capacity of weathering products had an extremely significant correlation with the content of the exchangeable K+, Na+, Ca2+, and Mg2+ and the content total of exchangeable cations (P < 0.01). Compared with the value at pH = 7.0 (CK), the total content of exchangeable cations of the weathering products of purple parent rock of the groups J3s, J3p, and J2s in cycle soaking experiment tests decreased by 8.75%-18.21%,10.83%-23.18%, and 5.85%-18.41%, respectively. When the amount of simulated rainfall at 24 times was compared with that at 12 times, the total content of exchangeable cations in J3s, J3p, and J2s decreased by 1.77%-24.85%, 8.99%-25.75%, and 8.05%-25.66%, respectively. In addition, the exchangeable cations characteristics of the weathering products were Ca2+> Mg2+> Na+ > K+ under the same acidity treatment. 【Conclusion】The acid buffer capacity, exchangeable salt ions, and total salt of weathering products under the soaking treatment in this experiment were lower than under the leaching treatment. It can be seen that the transport of minerals or nutrients on the slopes of hilly areas is dominated by leaching, while the transport of minerals or nutrients on the plains is dominated by leaching. Therefore, acid deposition may accelerate the occurrence of soil erosion on slopes to some extent, which in turn leads to an acceleration of the plain side process.
李春培,李 雪,汪 璇,刘刚才,赵吉霞,熊俊芬.酸化环境对紫色母岩风化产物交换性盐基离子及其酸缓冲容量的影响[J].土壤学报,DOI:10.11766/trxb202203200121,[待发表]
LI Chunpei, LI Xue, WANG Xuan, LIU Gangcai, ZHAO Jixia, XIONG Junfen. Effect of the Acidification Environment on Exchangeable Cations and Acid Buffering Capacity of Weathering Products of Purple Parent Rock[J]. Acta Pedologica Sinica, DOI:10.11766/trxb202203200121,[In Press]