四川盆地西缘4种人工林土壤团聚体及有机碳特征

发布时间：2019-01-01 19:49

【摘要】：土壤团聚体作为土壤结构的基本单元,强烈影响着土壤物理化学性质.通过干筛法对四川盆地西缘4种人工林(柳杉林、含笑林、桢楠林和麻栎林)两个土壤层次(0-20 cm和20-40 cm)土壤团聚体及有机碳进行研究.结果表明:4种人工林土壤团聚体均以2 mm粒径为主,而0.5-0.25 mm粒径团聚体仅占1.07%-3.39%;柳杉人工林0-20 cm土壤有机碳含量比20-40 cm高2倍多,其他3种人工林两个土壤层次差异幅度相对较小;与2 mm土壤大团聚体相比,各林地微小团聚体有机碳含量相对较高.2 mm粒径团聚体对有机碳贡献率达到72%-87%.但是,较小粒径土壤团聚体有机碳储量相对较高.综上所述,就土壤团聚体及有机碳特征而言,柳杉林和麻栎林比桢楠林和含笑林更适合用于当地植被恢复.
[Abstract]:As the basic unit of soil structure, soil aggregates strongly affect the physical and chemical properties of soil. Soil aggregates and organic carbon (soil aggregates and organic carbon) in two soil layers (0-20 cm and 20-40 cm) of four plantations in the western margin of Sichuan Basin (Cryptomeria fortunei forest, Miao forest, Zhennan forest and Quercus acutissima forest) were studied by dry sieve method. The results showed that the soil aggregates of the four plantations were mainly of 2 mm diameter, while 0.5-0.25 mm aggregates accounted for 1.07- 3.39; The soil organic carbon content in 0-20 cm plantation was more than 2 times higher than that in 20-40 cm, and the difference between the two soil layers in the other three plantations was relatively small. Compared with 2 mm soil aggregates, the content of organic carbon in small aggregates of forest land was relatively high, and the contribution rate of mm aggregates to organic carbon reached 72-87. However, the organic carbon storage of soil aggregates with small particle size is relatively high. In conclusion, in terms of soil aggregates and organic carbon characteristics, Cryptomeria forest and Quercus acacia forest are more suitable for local vegetation restoration.
【作者单位】：四川农业大学生态林业研究所四川省林业生态工程重点实验室;四川农业大学华西雨屏区生态环境监测站长江上游生态安全协同创新中心;
【基金】：国家自然科学基金项目(31570601,31570445,31500509) 中国博士后科学基金项目(2013M540714,2014T70880)资助~~
【分类号】：S714.2

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