Chin J Plant Ecol ›› 2023, Vol. 47 ›› Issue (6): 847-855.DOI: 10.17521/cjpe.2022.0253

Special Issue: 生态化学计量

• Research Articles • Previous Articles     Next Articles

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: * (
  • 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)


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