摘要
本研究以新疆北部古尔班通古特沙漠的一年生短命植物毛穗旱麦草为对象,通过采样分析沙质和砾质微生境下毛穗旱麦草根系及根鞘的特征,揭示根鞘土壤和根围土壤理化性质对根鞘形成的作用。结果表明,在沙质微生境中,毛穗旱麦草通过发育根毛增强水分和养分吸收,而在砾质微生境中则通过增大根系表面积、体积及分枝数来提高与土壤的接触,从而提高吸收效率。在抽穗期,沙质微生境促进根鞘发育,根鞘重量、长度和发育指数较高;在结实期,砾质微生境的根鞘参数明显较高,表明土壤颗粒对根系黏附性影响较大。沙质微生境下,多项根系指标与根鞘特征呈显著正相关性,尤其在抽穗期;而砾质微生境多项土壤因子与根鞘特征呈显著正相关,且在抽穗期呈显著正相关的指标多于沙质微生境。这些发现为理解短命植物的生态适应策略及植物资源的保护提供了理论依据。
This study focused on the annual ephemeral plant,Eremopyrum distans,in the Gurbantunggut Desert of northern Xinjiang.Root system and rhizosheath characteristics of Eremopyrum distans in sandy and gravelly microhabitats were analyzed to reveal the role of the physical and chemical properties of both the rhizosheath soil and the rhizosphere soil in rhizosheath formation.The results indicated that Eremopyrum distans in the sandy microhabitat enhanced water and nutrient absorption by developing root hairs,whereas in the gravelly microhabitat,contact with soil was increased by enlarging the root surface area,volume,and branch numbe,thereby improving absorption efficiency.At the heading stage,the sandy microhabitat promoted rhizosheath development,exhibiting higher rhizosheath weight,length,and development indices.In contrast,at the fruiting stage,rhizosheath parameters were significantly higher in the gravelly microhabitat,suggesting the effect of soil particle adhesion on the root system.Correlation analysis revealed that several root characteristics were positively correlated with rhizosheath characteristics in the sandy microhabitat,especially at the heading stage.In the gravelly microhabitat,however,several soil factors had positive correlations with rhizosheath characteristics,in which more factors were positively correlated compared with sandy microhabitat at the heading stage.These findings provide a theoretical framework for understanding the ecological adaptation strategies of ephemeral plants and the conservation of plant resources.
作者
张青青
孙瀚博
江康威
王亚菲
丁雨
吕程
ZHANG Qingqing;SUN Hanbo;JIANG Kangwei;WANG Yafei;DING Yu;LYU Cheng(College of Life Sciences,Xinjiang Agricultural University,Urumqi 830052,China;College of Grassland Science,Xinjiang Agricultural University,Urumqi 830052,China;College of Resource and Environment,Xinjiang Agricultural University,Urumqi 830052,China)
出处
《中国草地学报》
北大核心
2025年第5期55-65,共11页
Chinese Journal of Grassland
基金
新疆维吾尔自治区自然科学基金项目(2022D01A189)
国家自然科学基金项目(32260311)。
关键词
根鞘
根系构型
毛穗旱麦草
一年生短命植物
沙质生境
砾质生境
Rhizosheath
Root system architecture
Eremopyrum distans
Annual ephemeral plant
Sandy habitat
Gravel habitat
