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氮过量吸收对地肤暗呼吸速率及相对生长速率的影响

曹勋1,2,郑新军1**,李彦1,唐立松1   

  1. (1中国科学院新疆生态与地理研究所, 阜康荒漠生态系统国家野外观测研究站, 乌鲁木齐 830011; 2中国科学院大学, 北京 100049)
  • 出版日期:2013-08-10 发布日期:2013-08-10

Effects of excessive nitrogen absorption on the dark respiration rate and relative growth rate of Kochia scoparia.

CAO Xun1,2, ZHENG Xin-jun1**, LI Yan1, TANG Li-song1   

  1. (1Fukang Desert Ecosystem Observation and Experiment Station of Chinese Academy of Sciences, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, rümqi 830011, China; 2University of Chinese Academy of Sciences, Beijing 100049, China)
  • Online:2013-08-10 Published:2013-08-10

摘要:

为研究N过量吸收对植物生长的作用,以耐盐植物地肤(Kochia scoparia)作为研究对象,设置3个不同的施N处理,测量了不同生长时期的N含量、暗呼吸速率、生物量和相对生长速率(RGR)。结果表明:在N过量吸收的情况下,多余的N对暗呼吸速率并没有显著的影响,导致了暗呼吸中N的利用效率变低;单位质量暗呼吸速率与相对生长速率(RGR)有很好的线性相关,并且直线的斜率和截距并不受氮素过量吸收的影响,表明单位质量暗呼吸速率与RGR的关系不受施氮水平的影响;暗呼吸速率与总N的异速关系中,幂指数的大小与施N量相关,施N量越大对应的幂指数越小。

 

关键词: 缓冲带, 营养级, 系统特征, 生态通道(EWE)模型, 湿地生态系统

Abstract: To better understand the effects of excessive nitrogen (N) absorption on plant growth, three N fertilization treatments were installed to measure the plant N content, dark respiration rate, biomass, and relative growth rate (RGR) of halophyte (Kochia scoparia) during its growth period. Under the conditions of excessive N absorption, the excessive N had minor effects on the dark respiration rate, resulting in the low N use efficiency during dark respiration. There was a highly linear correlation between mass-based dark respiration rate and RGR, and this correlation was consistent across different N treatments. An allometric relationship was observed between dark respiration rate and plant N content, and the relationship was correlated with N application rate, i.e., the higher the N application rate, the smaller the scaling exponent.

Key words: buffering zone, Ecopath with Ecosim (EWE) model, wetland ecosystem, trophic level, system features.