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新疆45种荒漠植物粗根碳、氮、磷计量特征及其与环境的关系

何茂松1,2,3,罗艳1,3,4,彭庆文1,2,3,严正兵5,杨思琪1,李凯辉1,4,韩文轩1,3*   

  1. (1中国科学院新疆生态与地理研究所,乌鲁木齐 830011;2中国科学院大学,北京 100049;3中国科学院中亚生态与环境研究中心,乌鲁木齐 830011;4中国科学院新疆生态与地理研究所巴音布鲁克草原生态系统研究站,新疆巴音布鲁克 841314;5北京大学城市与环境学院,北京 100871)
  • 出版日期:2019-09-10 发布日期:2019-09-10

Carbon, nitrogen and phosphorus stoichiometry in the coarse roots of 45 desert plant species in relation to environmental factors across the deserts in Xinjiang.

HE Mao-song1,2,3, LUO Yan1,3,4, PENG Qing-wen1,2,3, YAN Zheng-bing5, YANG Si-qi1, LI Kai-hui1,4, HAN Wen-xuan1,3*   

  1. (1Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China; 2University of Chinese Academy of Sciences, Beijing 100049, China;
    3Research Center for Ecology and Environment of Central Asia, Chinese Academy of Sciencesi  Urumqi 830011, China; 4Bayanbuluk Grassland Ecosystem Research Station, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Bayinbuluk 841314, Xinjiang, China; 5College of Urban and Environmental Sciences, Peking University, Beijing 100871, China).
  • Online:2019-09-10 Published:2019-09-10

摘要: 通过测定新疆44个样地45种荒漠植物的粗根碳(C)、氮(N)、磷(P)元素含量,探索荒漠植物化学计量特征与环境因子的关系。结果表明:荒漠植物粗根C、N和P含量为440±73、9.86±3.84和0.82±0.48 mg·g-1,C∶N、C∶P和N∶P为51±21、707±388和15±10。不同生活型植物的粗根C含量存在显著差异,其中乔木最高、灌木次之、草本最低,而粗根P含量表现为相反的趋势;此外,灌木的粗根N含量显著高于乔木和草本。C与P、N与P呈异速生长关系,其幂指数分别为-0.460、0.699。C、N、P化学计量特征与经纬度、年平均温度、年平均降水量存在非线性关系。荒漠植物粗根C、N、P计量特征主要受气候因子的影响,生活型差异和土壤养分影响次之,反映了荒漠植物生长主要受水分限制。

关键词: 重金属, 生物有效性, 红树林沉积物, 东寨港

Abstract: We explored the relationship between C, N and P stoichiometry of coarse roots in 45 species of desert plants and environmental factors from 44 sites in Xinjiang. The results showed that coarseroot C, N and P concentrations of these species were 440±73, 9.86±3.84, and 0.82±0.48 mg·g-1, respectively, and C∶N, C∶P and N∶P averaged 51±21, 707±388, and 15±10, respectively. Significant differences in nutrient concentration existed among three plant lifeforms. Specifically, coarseroot C concentrations decreased in the order of trees, shrubs and herbs, while root P showed an opposite trend. The coarse-root N concentration was the highest in shrubs. Only C vs P and N vs P in roots showed allometric growth relationships, with power exponents being -0.460 and 0.699, respectively. There were nonlinear relationships of coarse-root C, N and P with longitude, latitude, mean annual temperature (MAT), and mean annual precipitation (MAP). In comparison with life-form and soil nutrient content, climatic factors (MAP, MAT) had greater effects on the stoichiometric characteristics of C, N and P in the coarse roots of desert plants, which reflects water limitation for plant growth in deserts.

Key words: heavy metal, bioavailability, mangrove sediment, Dongzhai Harbor.