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应用生态学报 ›› 2018, Vol. 29 ›› Issue (5): 1405-1411.doi: 10.13287/j.1001-9332.201805.025

• 稳定同位素生态学专栏 • 上一篇    下一篇

若尔盖草甸退化对土壤碳、氮和碳稳定同位素的影响

赵云飞1, 汪霞1,2*, 欧延升1, 洪苗苗1, 黄政1, 李佳1, 贾海霞1   

  1. 1兰州大学资源环境学院, 兰州 730000;
    2兰州大学西部环境教育部重点实验室, 兰州 730000
  • 收稿日期:2017-11-19 出版日期:2018-05-18 发布日期:2018-05-18
  • 通讯作者: *E-mail: wangxia@lzu.edu.cn
  • 作者简介:赵云飞,男,1992年生,硕士研究生. 主要从事土壤生态研究. E-mail: zhaoyf2016@lzu.edu.cn
  • 基金资助:
    本文由国家自然科学基金项目(41572332)、甘肃省重点研发计划项目(17YF1FA131)和兰州大学西部环境教育部重点实验室开放基金项目(lzujbky-2016-bt01)资助

Effects of alpine meadow degradation on soil carbon, nitrogen, and carbon stable istope in Zoige Plateau.

ZHAO Yun-fei1, WANG Xia1,2*, OU Yan-sheng1, HONG Miao-miao1, HUANG Zheng1, LI Jia1, JIA Hai-xia1   

  1. 1College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China;
    2 Ministry of Education Key Laboratory of Western China’s Environmental Systems, Lanzhou University, Lanzhou 730000, China
  • Received:2017-11-19 Online:2018-05-18 Published:2018-05-18
  • Contact: *E-mail: wangxia@lzu.edu.cn
  • Supported by:
    This work was supported by the National Nature Science Foundation of China (41572332), the Key Research and Development Program of Gansu Province (17YF1FA131), and the Open Foundation of Ministry of Education Key Laboratory of Western China’s Environmental Systems, Lanzhou University (lzujbky-2016-bt01)

摘要: 为了解不同退化阶段高寒草甸土壤碳、氮和碳稳定同位素的差异,对若尔盖湿地内沼泽草甸、草原化草甸、退化草甸3个阶段土壤的碳、氮和碳稳定同位素进行了分析.结果表明:若尔盖湿地草甸土壤δ13C 值介于-26.21‰~-24.72‰之间,土壤δ13C 值随土层加深而增大.土壤δ13C 值与有机碳含量对数值呈线性负相关.表层土壤(0~10 cm)δ13C值大小顺序为草原化草甸>退化草甸>沼泽草甸,β值大小顺序为草原化草甸>沼泽草甸>退化草甸.沼泽草甸、草原化草甸、退化草甸0~30 cm 土壤碳含量分别为105.32、42.11和31.12 g·kg-1,氮含量分别为8.74、3.41和2.81 g·kg-1,C/N分别为11.26、11.23和10.89.随着草甸的退化,土壤碳、氮呈降低趋势,退化草甸C/N值低于沼泽草甸和草原化草甸.随着土层深度加深,碳、氮含量呈现降低趋势.草甸退化导致的土壤δ13C 值差异主要发生在表层0~10 cm.3个退化阶段中,退化草甸土壤的β值和C/N最低,表明退化草甸土壤矿化作用较强.

关键词: 若尔盖, 退化, 高寒草甸, 碳和氮, 碳稳定同位素

Abstract: To investigate the differences of soil carbon, nitrogen, and carbon stable isotopes in Zoige wetland, we analyzed the abundance of carbon stable isotopes and the contents of carbon and nitrogen in soils of three kinds of retrogressive successional grasslands (swampy meadow, steppe meadow, and degraded meadow). The results showed that the δ13C values in the meadow soil of Zoige alpine wetland ranged from -26.21‰ to -24.72‰. The abundance of δ13C increased with the depth of soil. There was a significantly negative relationship between δ13C values and logarithm of soil organic carbon content across the soil profile. The δ13C values in the surface soil (0-10 cm) followed the order of grassland meadow>degraded meadow>swampy meadow, and the β values followed the order of grassland meadow>swampy meadow>degraded meadow. Soil organic carbon content was 105.32, 42.11 and 31.12 g·kg-1, while nitrogen content was 8.74, 3.41 and 2.81 g·kg-1, and C/N was 11.26, 11.23 and 10.89, in the swampy meadow, grassland meadow and degraded meadow, respectively. The soil C/N was lower in degraded meadow than that in swampy meadow and grassland meadow. The total organic carbon and nitrogen content decreased obviously with increasing soil depth. The variations of soil δ13C among meadows with different degradation stages were mainly restricted to the 0-10 cm soil layer. The β values and C/N were the lowest in degraded meadow among three stages, suggesting that the mineralization rate of degraded meadow soil organic matter was relatively fast.

Key words: alpine meadow, carbon and nitrogen, Zoige, carbon stable isotope, degradation