Acta Agrestia Sinica ›› 2019, Vol. 27 ›› Issue (1): 71-79.DOI: 10.11733/j.issn.1007-0435.2019.01.010

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Effects of Utilization Patterns on the Spectral Characteristics of Soil Dissolved Organic Matter in Alpine Meadow of Qinghai Province

ZHANG Miao-miao1, CHEN Wei2, ZHAO Jun3, LIN Li4, ZHANG De-gang1   

  1. 1. College of Grassland Science, Gansu Agricultural University, Lanzhou, Gansu Province 730070, China;
    2. Geography and Environmental Engineering College, Lanzhou City University, Lanzhou, Gansu Province 730070, China;
    3. Xiying River Nature Conservation Station of Qilian Nature Reserve, Zhangye, Gansu Province 734031, China;
    4. Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining, Qinghai Province 810001, China
  • Received:2018-09-21 Revised:2018-12-19 Online:2019-02-15 Published:2019-04-13

利用方式对青海省高寒草甸土壤可溶性有机质光谱学特性的影响

张苗苗1, 陈伟2, 赵军3, 林丽4, 张德罡1   

  1. 1. 甘肃农业大学草业学院, 甘肃 兰州 730070;
    2. 兰州城市学院地理与环境工程学院, 甘肃 兰州 730070;
    3. 甘肃祁连山 国家级自然保护区西营河自然保护站, 甘肃 张掖 734031;
    4. 中国科学院西北高原生物研究所, 青海 西宁 810001
  • 通讯作者: 张德罡,E-mail:zhangdg@gsau.edu.cn
  • 作者简介:张苗苗(1985-),女,山东嘉祥人,博士研究生,主要从事草地生态、资源与环境方面的研究。E-mail:187342041@qq.com
  • 基金资助:
    国家重点研发计划(2016YFC0501900,2016YFC0501902);自然科学基金青年基金项目(31500368);中国农业科学院科技创新工程专项资金项目(CAAS-ASTIP-08-LIHPS-08);甘肃省高等学校科研项目(2015A-124)资助

Abstract: Soil dissolved organic matter is the most active component of the global carbon cycle. It plays an important role in the terrestrial ecosystem. In order to explore the effects of utilization patterns to the content and structural characteristics of soil dissolved organic matter of alpine meadow in Qinghai province,the contents of soil dissolved organic carbon,ultraviolet-visible spectroscopy,SUVA254,SUVA280,f450/500,HIX and synchronous fluorescence spectroscopy in 0 to 10 cm and 10 to 20 cm soil layers under 4 different utilization patterns,including secondary seabuckthorn forest,returning farmland to forest,farmland and natural pasture,were measured. The results showed that the variation of soil dissolved organic carbon and organic carbon contents in 0 to 10 cm layers performed a similar pattern,i.e. natural pasture > secondary seabuckthorn forest > returning farmland to forest > farmland. However,soil of returning farmland to forest and secondary seabuckthorn forest in 10 to 20 cm layers had higher dissolved organic carbon and organic carbon contents. The contents of organic carbon and dissolved organic carbon decreased with the depth of the soil layer. The same as the complexity of soil dissolved organic matter. The soil dissolved organic matter in the soil of natural grazing land had a higher degree of aromatization and humification,and had more polycyclic aromatic hydrocarbons. The results indicated that the structure of soil dissolved organic matter of natural pasture was more complicated and more stable. It could give a positive effect on maintaining the balance and ecological stability of the carbon pool in the alpine region of Qinghai province. The structure of soil dissolved organic matter in 0 to 10 cm layers was more complicated.

Key words: Utilization patterns, Alpine meadow, Dissolved organic matter, Spectral characteristics

摘要: 为深入了解不同利用方式对青海省高寒草甸土壤可溶性有机质含量和结构特性的影响,以次生沙棘林地、退耕还林地、农田和天然放牧地等4种利用方式土壤作为对象,研究了其0~10 cm和10~20 cm土层可溶性有机质含量、紫外-可见光光谱及其特征参数、荧光光谱及其特征参数等。结果表明,0~10 cm土层可溶性有机碳和有机碳含量由高到低的顺序为天然放牧地>退耕还林地>次生沙棘林>农田。10~20 cm土层中的可溶性有机碳及有机碳含量在退耕还林地和次生沙棘林中较高。有机碳含量和可溶性有机碳含量及其复杂程度随土层的加深而降低。天然放牧地土壤可溶性有机质的芳香化程度和腐殖化程度较高,含有较多的多环芳烃。研究结果指出,天然放牧地土壤可溶性有机质的结构更为复杂,稳定性更强,对维护青海省高寒地区碳库平衡和生态稳定有积极作用。0~10 cm土层土壤可溶性有机质的结构更为复杂。

关键词: 利用方式, 高寒草甸, 可溶性有机质, 光谱学特性

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