植物生态学报 ›› 2023, Vol. 47 ›› Issue (6): 847-855.DOI: 10.17521/cjpe.2022.0253

• 研究论文 • 上一篇    下一篇

水位下降对若尔盖高寒草本沼泽木里薹草氮磷重吸收的影响

胡昭佚1, 陈天松1, 赵丽2,4, 许培轩2, 吴正江1, 董李勤1,3,*(), 张昆2   

  1. 1西南林业大学地理与生态旅游学院, 昆明 650224
    2西南林业大学湿地学院, 国家高原湿地研究中心, 昆明 650224
    3国家林业和草原局西南生态文明研究中心, 昆明 650224
    4云南省水利水电勘测设计研究院, 昆明 650021
  • 收稿日期:2022-06-16 接受日期:2023-02-14 出版日期:2023-06-20 发布日期:2023-02-24
  • 通讯作者: * (dongliqin2013@163.com)
  • 基金资助:
    国家自然科学基金(41101097);国家自然科学基金(41461022);云南省院士专家工作站(2019IC012);云南省基础研究专项(202001AT070132);云南省教育厅基金项目(2018JS346);云南省教育厅基金项目(2019J0184);国家科技基础资源调查专项(2019FY100603)

Effect of water level drop on nitrogen and phosphorus reabsorption of Carex muliensis in a herb swamp in Zoigê wetland, China

HU Zhao-Yi1, CHEN Tian-Song1, ZHAO Li2,4, XU Pei-Xuan2, WU Zheng-Jiang1, DONG Li-Qin1,3,*(), ZHANG Kun2   

  1. 1School of Geography and Ecotourism, Southwest Forestry University, Kunming 650224, China
    2National Plateau Wetland Research Center, Wetland College, Southwest Forestry University, Kunming 650224, China
    3Southwest Ecological Civilization Research Center of National Forestry and Grassland Administration, Kunming 650224, China
    4Yunnan Institute of Water & Hydropower Engineering Investigation, Design and Research, Kunming 650021, China
  • Received:2022-06-16 Accepted:2023-02-14 Online:2023-06-20 Published:2023-02-24
  • Contact: * (dongliqin2013@163.com)
  • Supported by:
    National Natural Science Foundation of China(41101097);National Natural Science Foundation of China(41461022);Yunnan Provincial Academician and Expert Workstation(2019IC012);Yunnan Provincial Basic Research Special Project(202001AT070132);Yunnan Provincial Department of Education Fund Project(2018JS346);Yunnan Provincial Department of Education Fund Project(2019J0184);National Science and Technology Basic Resources Investigation Special Project of China(2019FY100603)

摘要:

养分重吸收是植物适应环境的重要策略。该研究以若尔盖高寒草本沼泽中的木里薹草作为研究对象, 通过模拟实验, 于8月、10月对绿叶和枯叶及土壤采样并测定养分含量, 研究其在水位下降和自然水位下叶片养分含量、土壤养分含量和养分重吸收效率的变化规律, 以及相互间的关系。使用单因素方差分析比较不同组间叶片氮(N)含量、叶片磷(P)含量、土壤速效N含量、土壤速效P含量、叶片N:P和养分重吸收效率的差异, 使用一元线性回归拟合土壤速效N、P含量和养分重吸收效率之间的关系, 木里薹草叶片N含量、P含量、N:P和养分重吸收效率的关系均采用Pearson相关分析。结果表明: 水位下降后, 木里薹草土壤速效N含量升高, 速效P含量降低, 进一步导致木里薹草绿叶N含量增加, P含量降低, 枯叶N、P含量均降低, 木里薹草叶片N、P重吸收效率升高, 说明水位下降通过改变土壤速效养分含量影响木里薹草绿叶养分含量, 改变植物养分获取能力(如根数、根长)影响枯叶养分含量, 进而影响养分重吸收效率。

关键词: 水位下降, 养分重吸收, 木里薹草, 若尔盖湿地

Abstract:

Aims Nutrient reabsorption is one of the important strategies for plants to adapt to the environment. In this study, we investigated the nutrient content of green and senescent leaves and soil in the Carex muliensis herb swamp in August and October, in order to examine soil nutrient content and nutrient reabsorption efficiency, as well as the relationship between them under the water level drop and natural water level based on the simulation experiment.

Methods Single factor analysis of variance was used to compare the differences of leaf nitrogen (N) content, phosphorus (P) content, soil available N content, soil available P content, leaf N:P and nutrient reabsorption efficiency among different treatments, and the relationship between soil available N, P contents and nutrient reabsorption efficiency was also fitted by univariate linear regression. Pearson correlation analysis was used to analyze the relationship of N, P contents, N:P with nutrient reabsorption efficiency in leaves of C. muliensis.

Important findings The results showed that the soil available N content increased and the available P content decreased after the water level drop, which further led to an increase in the N content and a decrease in the P content of the green leaves, a decrease in the N content and P content of the senescent leaves, and an increase in the N and P reabsorption efficiency of the leaves of C. muliensis. These results indicated that the decreased water level affected the nutrient content of the green leaves of C. muliensis by changing the contents of soil available nutrients, and thus affected the nutrient contents of the senescent leaves by changing the plant nutrient acquisition ability (i.e. root number and root length), and consequently affected the nutrient reabsorption efficiency.

Key words: water level drop, nutrient reabsorption, Carex muliensis, Zoigê wetland