植物生态学报 ›› 2022, Vol. 46 ›› Issue (11): 1376-1387.DOI: 10.17521/cjpe.2022.0257

• 研究论文 • 上一篇    下一篇

毛乌素沙地沙丘不同固定阶段黑沙蒿叶性状特征

代远萌1,2, 李满乐1,2, 徐铭泽1,2, 田赟1,2,3,*(), 赵洪贤1,2, 高圣杰1,2, 郝少荣1,2, 刘鹏1,2,3, 贾昕1,2,3, 查天山1,2,3   

  1. 1北京林业大学水土保持学院, 北京 100083
    2宁夏盐池毛乌素沙地生态系统国家定位观测研究站, 宁夏盐池 751500
    3北京林业大学水土保持国家林业和草原局重点实验室, 北京 100083
  • 收稿日期:2022-06-18 接受日期:2022-09-23 出版日期:2022-11-20 发布日期:2022-09-28
  • 通讯作者: *田赟(tianyun@bjfu.edu.cn)
  • 基金资助:
    国家自然科学基金(31901366);国家自然科学基金(32071842);国家自然科学基金(32071843);国家自然科学基金(32101588)

Leaf traits of Artemisia ordosica at different dune fixation stages in Mau Us Sandy Land

DAI Yuan-Meng1,2, LI Man-Le1,2, XU Ming-Ze1,2, TIAN Yun1,2,3,*(), ZHAO Hong-Xian1,2, GAO Sheng-Jie1,2, HAO Shao-Rong1,2, LIU Peng1,2,3, JIA Xin1,2,3, ZHA Tian-Shan1,2,3   

  1. 1School of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China
    2Yanchi Ecology Research Station of Mau Us Desert, Yanchi, Ningxia 751500, China
    3Key Laboratory of State Forestry and Grassland Administration on Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China
  • Received:2022-06-18 Accepted:2022-09-23 Online:2022-11-20 Published:2022-09-28
  • Contact: *TIAN Yun(tianyun@bjfu.edu.cn)
  • Supported by:
    The National Natural Science Foundation of China(31901366);The National Natural Science Foundation of China(32071842);The National Natural Science Foundation of China(32071843);The National Natural Science Foundation of China(32101588)

摘要:

半干旱地区沙丘固定过程中的植物叶性状的动态研究对于揭示该地区沙生植物对环境变化的生态适应策略具有重要意义。该研究选择毛乌素沙地沙丘4个不同固定阶段(半固定沙丘、固定沙丘、土壤结皮固定沙丘和草本植物固定沙丘)典型沙生植物黑沙蒿(Artemisia ordosica)为研究对象, 通过相关性分析、主成分分析及相似性分析等方法对黑沙蒿叶面积(LA)、比叶面积(SLA)、叶干物质含量(LDMC)和最大净光合速率(Amax)等11个叶性状进行分析, 探明黑沙蒿叶性状随沙丘逐渐固定的变化规律及叶性状间相互关系。主要结果有: (1)黑沙蒿LA和Amax在半固定沙丘阶段显著高于其他3个阶段; 叶碳含量随沙丘逐渐固定呈现先显著升高后略下降的变化趋势; 叶磷含量在半固定沙丘和土壤结皮固定沙丘阶段显著高于其余2个阶段, 且在半固定沙丘阶段最高。这些叶性状的变化表明在半固定沙丘阶段黑沙蒿倾向于增强光合作用来提高生存能力。(2)在不同阶段, 与植物光合能力相关的LA、SLA分别同反映物理防御结构的LDMC、叶组织密度间存在显著或极显著负相关关系。表明植物为适应环境, 对叶片光合能力的投资会随物理防御结构投资的增加而降低。这也表明了植物在生长繁殖和增强防御能力之间存在一种“此消彼长”的权衡关系。(3)综合沙丘的4个固定阶段, 与植物营养相关的叶化学性状同形态、生理性状间均存在显著相关关系; 且随沙丘逐渐固定, 黑沙蒿在资源权衡策略上存在从“快速投资-收益型”向“缓慢投资-收益型”变化的趋势。该研究结果进一步证实了沙生植物可通过叶性状与叶性状间相互关系优化其资源权衡策略, 以此来适应环境变化。

关键词: 叶性状, 资源权衡策略, 固沙阶段, 黑沙蒿

Abstract:

Aims The dynamic changes of plant leaf traits during sand dune fixation in semi-arid areas is of significance to reveal the ecologically adaptative strategies of sand plants to environmental changes in the region.
Methods Eleven leaf traits of a typical species, Artemisia ordosica, in the Mau Us Sandy Land, was measured at its four different stages of sand dune fixation (semi-fixed dune, fixed dune, fixed dune with biological soil crusts, fixed dune with abundant herbaceous plants). The variations in the leaf traits and their relationships over different sand-fixation stages were tested using correlation, principal component and similarity analysis.
Important findings (1) The leaf area (LA) and maximum net photosynthetic rate (Amax) in the semi-fixed dune stage were significantly higher than the other three stages of sand dune fixation, leaf carbon content increased significantly and then decreased slightly as the dunes gradually fixed. Leaf phosphorus content at the semi-fixed dune and the fixed dune with biological soil crusts was significantly higher than that at other two stages, and being highest at the semi-fixed dune stage. These variations in leaf traits indicated that A. ordosica tended to enhance photosynthesis for survival in the semi-fixed dune stage. (2) Photosynthesis-related traits of LA and specific leaf area (SLA) were significantly and negatively correlated with physically defense-related structure traits of leaf dry matter content (LDMC) and leaf tissue density, respectively, regardless of the stage of sand dune fixation. The results demonstrated that in order to adapt to the dry environment, the investment in leaf photosynthetic capacity would decrease with the increase of investment in physical defense structure. It also showed that there was a trade-off between the plant growth and defense capability enhancement at different stages of sand dune fixation. (3) The leaf chemical traits were significantly correlated with the leaf morphological and physiological traits. And the leaf traits tended to develop from “rapid investment - return” to “slow investment - return” as sand dune fixed. The results demonstrated that sandy plants could adjust their resource use trade-off strategy to adapt to different environmental changes through leaf traits and interrelationship optimization.

Key words: leaf trait, resource trade-off strategy, sand fixation stage, Artemisia ordosica