欢迎访问《生态学杂志》官方网站,今天是 分享到:

生态学杂志 ›› 2021, Vol. 40 ›› Issue (10): 3159-3166.doi: 10.13292/j.1000-4890.202110.007

• 研究报告 • 上一篇    下一篇

氮沉降背景下藓类植物齿肋赤藓的氮磷特征及异速生长关系

梅月磊1,2,陶冶2,李永刚2,张元明2,张玲卫1*,周晓兵2*     

  1. 1新疆农业大学草业与环境科学学院, 乌鲁木齐 830052; 2中国科学院新疆生态与地理研究所荒漠与绿洲生态国家重点实验室, 乌鲁木齐 830011)
  • 出版日期:2021-10-10 发布日期:2022-04-01

Characteristics of nitrogen and phosphorus concentrations and their allometric relationship in moss plants Syntrichia caninervis under elevated nitrogen deposition.

MEI Yue-lei1,2, TAO Ye2, LI Yong-gang2, ZHANG Yuan-ming2, ZHANG Ling-wei1*, ZHOU Xiao-bing2*   

  1. (1College of Grassland and Environment Sciences, Xinjiang Agricultural University, Urumqi 830052, China; 2State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China).
  • Online:2021-10-10 Published:2022-04-01

摘要: 随着全球变化的加剧,氮沉降的生态效应越发受到关注,尤其是氮缺乏且对氮响应敏感的荒漠生态系统。藓类结皮是荒漠生物土壤结皮发育的高级阶段,对荒漠生态系统氮素循环具有重要作用,但藓类植物养分状况对氮沉降的响应特征尚不明晰。以古尔班通古特沙漠优势藓类齿肋赤藓(Syntrichia caninervis)为研究对象,通过模拟不同氮沉降水平(0~3 g N·m-2·a-1),对比研究了齿肋赤藓地上和地下部分氮磷化学计量对氮沉降的响应特征。结果表明:藓类植物地上部分氮(17.89 g·kg-1)、磷(1.81 g·kg-1)含量高于地下部分(氮13.95 g·kg-1、磷1.28 g·kg-1),但两部分氮磷比差异不显著;随氮沉降增加,地上部分氮、磷含量均呈现先升后降趋势,地下部分氮含量与地上部分变化趋势相同,但磷含量受氮影响不显著。地上部分氮磷比随氮沉降增加保持相对稳定,而地下部分氮磷比有显著增加趋势;齿肋赤藓植物化学计量响应与其生长状态一致,呈低氮促进而高氮抑制的效应,但地上与地下部分氮、磷之间能够协同变化,具有异速生长特征。本研究加深了对荒漠藓类植物适应荒漠环境能力的理解,为评估长期氮沉降下荒漠藓类植物生长趋势提供依据。

关键词: 氮沉降, 齿肋赤藓, 化学计量, 异速生长, 古尔班通古特沙漠

Abstract: Along with the intensification of global change, more and more researches have been focused on the ecological effects of nitrogen deposition, especially for the deserts which are limited by nitrogen availability and sensitive to changes in nitrogen inputs. Moss crust is the late successional stage of biological soil crusts, which plays an important role in nitrogen cycling of deserts. However, the responses of moss nutrient to nitrogen deposition are still unclear. In this study, different nitrogen deposition levels (0-3 g N·m-2·a-1) were simulated on moss crust dominated by S. caninervisin the Gurbantunggut Desert. Nitrogen and phosphorus stoichiometry in aboveground and belowground parts of S. caninervis under nitrogen deposition were examined. Concentrations of nitrogen (17.89 g·kg-1) and phosphorus (1.81 g·kg-1) in the aboveground part of moss were higher than that in the belowground part (13.95 vs. 1.28 g·kg-1), while there was no difference in ratio of nitrogen to phosphorus between the two parts. With increasing nitrogen deposition level, the concentrations of nitrogen and phosphorus in the aboveground part increased firstly and then decreased. The nitrogen concentration in the belowground part had a similar trend to that in the aboveground part, whereas the phosphorus concentration was not affected by nitrogen addition. The ratio of nitrogen to phosphorus in aboveground part remained relatively stable, while the ratio in belowground part increased with increasing nitrogen deposition level. Our results showed that the stoichiometric response of S. caninervis was consistent with its growth responses, with positive effects of low nitrogen addition dose and negative effects of high dose.Nitrogen and phosphorus concentrations can vary coordinately between the aboveground and belowground parts and showed an allometric relationship. This study improved our understanding of the adaptive ability of desert mosses, and provided scientific basis to assess the growth trend of desert mosses under long-term nitrogen deposition.

Key words: nitrogen deposition, Syntrichia caninervis, stoichiometry, allometric growth, Gurban tunggut Desert.