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草业学报 ›› 2022, Vol. 31 ›› Issue (8): 72-80.DOI: 10.11686/cyxb2021293

• 研究论文 • 上一篇    下一篇

不同群落生境蒙古冰草种群株丛结构和叶片功能性状的变化

刘万龙1(), 许冬梅1,2(), 史佳梅1, 许爱云1   

  1. 1.宁夏大学农学院,宁夏 银川 750021
    2.宁夏大学西北土地退化与生态恢复国家重点实验室培育基地,宁夏 银川 750021
  • 收稿日期:2021-07-27 修回日期:2021-11-10 出版日期:2022-08-20 发布日期:2022-07-01
  • 通讯作者: 许冬梅
  • 作者简介:E-mail: nxxudongmei@163.com
    刘万龙(1997-),男,宁夏固原人,在读硕士。E-mail: nxuliuwanlong@163.com
  • 基金资助:
    国家自然科学基金项目(32060405);宁夏高等学校一流学科建设(草学学科)项目(NXYLXK2017A01)

Plant cluster structure and leaf functional characters of Agropyron mongolicum populations in different plant species associations

Wan-long LIU1(), Dong-mei XU1,2(), Jia-mei SHI1, Ai-yun XU1   

  1. 1.College of Agriculture,Ningxia University,Yinchuan 750021,China
    2.Key Laboratory of Ecosystem Restoration and Reconstruction,Ministry of Education,Ningxia University,Yinchuan 750021,China
  • Received:2021-07-27 Revised:2021-11-10 Online:2022-08-20 Published:2022-07-01
  • Contact: Dong-mei XU

摘要:

为探究蒙古冰草种群动态及叶功能性状在不同群落生境的变化,以宁夏盐池县荒漠草原蒙古冰草+草木樨状黄芪(MC)、蒙古冰草+老瓜头(ML)、蒙古冰草+牛枝子(MN)3种不同群落生境为研究对象,按丛径将蒙古冰草个体划分为Ⅰ级株丛(0~2.0 cm)、Ⅱ级株丛(2.1~4.0 cm)、Ⅲ级株丛(4.1~6.0 cm)、Ⅳ级株丛(6.1~8.0 cm)、Ⅴ级株丛(8.1~10.0 cm)和Ⅵ级株丛(>10.0 cm),研究了不同群落生境蒙古冰草种群的株丛结构和叶功能性状。结果表明:在蒙古冰草+草木樨状黄芪和蒙古冰草+牛枝子群落生境中,Ⅰ、Ⅱ级株丛较多,株丛密度较大,在蒙古冰草+老瓜头群落生境中,以Ⅲ、Ⅳ级株丛为主,株丛密度较小。蒙古冰草+草木樨状黄芪和蒙古冰草+老瓜头群落生境中蒙古冰草叶面积和比叶面积分别为4.68 cm2和41.2 cm2·g-1、4.70 cm2和39.2 cm2·g-1,显著高于蒙古冰草+牛枝子群落生境的3.38 cm2和27.7 cm2·g-1。蒙古冰草株丛结构主要受土壤全钾的影响,而土壤水分、有机碳、全氮和全磷是影响叶功能性状的主要因子。由此,可通过改变种群数量特征和叶功能性状以适应自然生境的变化。

关键词: 荒漠草原, 群落生境, 蒙古冰草, 株丛结构, 叶功能性状

Abstract:

This study explored the changes in population dynamics and leaf morphological traits of Agropyron mongolicum across three different plant community associations: A. mongolicum+Astragalus melilotoides (MC), A. mongolicum+Cynanchum komarovii (ML) and A. mongolicum+Lespedeza potaninii (MN) in desert steppe in Yanchi County, Ningxia. The individual plants of A. mongolicum were classified according to their basal diameter into grade I plant clumps (0-2.0 cm), grade Ⅱ plant clumps (2.1-4.0 cm), grade Ⅲ plant clumps (4.1-6.0 cm), grade Ⅳ plant clumps (6.1-8.0 cm), grade V plant clumps (8.1-10.0 cm) and grade Ⅵ plant clumps (>10.0 cm diameter). The plant clump size and leaf functional traits of A. mongolicum and their relationships with habitat factors were studied. It was found that in the MC and MN communities of A. mongolicum, there were more A. mongolicum plant clumps of grade I and grade Ⅱ, while in the ML community, the population density of A. mongolicum was lower, with grade Ⅲ and grade Ⅳ plant clumps being dominant. The leaf area and specific leaf area of A. mongolicum in the MC and ML communities of A. mongolicum were, respectively, 4.68 cm2 and 41.2 cm2·g-1, 4.70 cm2 and 39.2 cm2·g-1, which was significantly higher than values of 3.38 cm2 and 27.7 cm2·g-1 recorded in the MN community of A. mongolicum. The clump size of A. mongolicum was correlated with total potassium, while the soil moisture, organic carbon, total nitrogen and total phosphorus were the main factors affecting the leaf functional traits of A. mongolicum. Therefore, A. mongolicum exhibited adaptation to habitat changes in different species associations by altering its population distribution and leaf morphological traits.

Key words: desert steppe, community habitats, Agropyron mongolicum, plant clump structure, leaf functional traits