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中国沙漠 ›› 2023, Vol. 43 ›› Issue (2): 1-10.DOI: 10.7522/j.issn.1000-694X.2022.00107

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齿肋赤藓( Syntrichia caninervis )氮磷计量特征对降水量的响应

黄韵杰1,2(), 李永刚1, 尹本丰1, 张元明1()   

  1. 1.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,新疆 乌鲁木齐 830011
    2.中国科学院大学,北京 100049
  • 收稿日期:2022-03-04 修回日期:2022-07-23 出版日期:2023-03-20 发布日期:2023-04-12
  • 通讯作者: 张元明
  • 作者简介:张元明(E-mail: zhangym@ms.xjb.ac.cn
    黄韵杰(1998—),男,重庆人,硕士研究生,研究方向为植物逆境生态学。E-mail: huangyunjie21@mails.ucas.ac.cn
  • 基金资助:
    国家自然科学基金项目(42007099);新疆维吾尔自治区“天池博士计划”项目

Response of nitrogen and phosphorus stoichiometry in Syntrichia caninervis to annual precipitation

Yunjie Huang1,2(), Yonggang Li1, Benfeng Ying1, Yuanming Zhang1()   

  1. 1.State Key Laboratory of Desert and Oasis Ecology,Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,Urumqi 830011,China
    2.University of Chinese Academy of Sciences,Beijing 100049,China
  • Received:2022-03-04 Revised:2022-07-23 Online:2023-03-20 Published:2023-04-12
  • Contact: Yuanming Zhang

摘要:

荒漠藓类植物是典型的变水植物,对水分能够快速做出反应,恢复光合、呼吸等生理活性,且荒漠藓类植物对水分的敏感性显著高于维管束植物。藓类植物的生态化学计量特征易受到微环境影响,对于藓类植物生态化学计量特征是否受荒漠降水梯度的影响并不清楚。为深入了解荒漠藓类结皮氮(N)、磷(P)化学计量特征对荒漠年降水的响应特征,以齿肋赤藓(Syntrichia caninervis)作为研究对象,测定3个年降水量下齿肋赤藓植物地上、地下部分N、P元素含量,分析不同降水梯度下齿肋赤藓植物N、P元素化学计量特征。结果表明:(1)齿肋赤藓植物地上部分N、P含量显著高于地下部分,地下部分N、P元素的变异系数比地上部分高,齿肋赤藓植物地上部分氮磷比(N∶P)值为10.17~12.03,生长可能受到氮限制;(2)随年降水量的增加,齿肋赤藓植物地上部分N、P含量呈下降趋势,N∶P比均呈升高趋势;(3)齿肋赤藓植物N、P含量显著正相关,且随年降水量的增加,齿肋赤藓植物地上、地下部分的N-P幂关系指数无显著变化。古尔班通古特沙漠齿肋赤藓植物在N、P养分分配上具有较高的稳定性,且能够通过调节地上与地下部分N、P元素化学计量特征维持其生长以适应荒漠降水量的变化。

关键词: 生态化学计量学, 养分特征, 古尔班通古特沙漠, 年降水量, 齿肋赤藓(Syntrichia caninervis

Abstract:

Desert mosses are typical poikilohydric plants, and can quickly respond to water, restore photosynthetic, respiratory and other physiological activities, and the sensitivity of desert mosses to water is significantly higher than that of vascular plants. Previous studies found that the ecological stoichiometric characteristics of mosses are vulnerable to the influence of microenvironment, and it is not clear whether the ecological stoichiometric characteristics of mosses are affected by the desert precipitation gradient. In order to deeply understand the response characteristics of nitrogen and phosphorus stoichiometric characteristics of desert moss crust to desert annual average precipitation, Syntrichia caninervis was taken as the research object, the contents of N and P elements in the aboveground and underground parts of S. caninervis under three different annual average precipitation were measured, and the stoichiometric characteristics of nitrogen and phosphorus elements of S. caninervis under different precipitation gradients were analyzed. The results showed that: (1) the contents of N and P in the aboveground part of S. caninervis were significantly higher than those in the underground part, the coefficient of variation of N and P in the underground part was higher than that in the aboveground part, and the average ratio of nitrogen to phosphorus in the aboveground part of S. caninervis was between 10.17-12.03, which may be limited by nitrogen. (2) With the increase of annual average precipitation, the contents of N and P in the aboveground part of S. caninervis decreased, and the N∶P ratio showed an upward trend. (3) there was a significant positive correlation between the contents of N and P in S. caninervis plants. With the increase of annual precipitation, the N-P relation index of S. caninervis did not change significantly. The results show that S. caninervis in Gurbantunggut Desert have high stability in the distribution of nitrogen and phosphorus nutrients, and can maintain their growth by adjusting the stoichiometric characteristics of nitrogen and phosphorus in the aboveground and underground parts to adapt to the changes of desert precipitation.

Key words: ecological stoichiometry, nutrient characteristics, Gurbantunggut Desert, annual precipitation, Syntrichia caninervis

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