摘要
短命植物是中国荒漠区系中重要的组成部分,坡向是准噶尔荒漠区最重要的地形因子之一,可能影响该地区短命植物的生物量和化学计量特征。该研究通过分析两种十字花科的短命植物涩荠(Malcolmia africana)和条叶庭荠(Alyssum linifolium)的不同器官(根、茎、叶和繁殖器官)在不同坡向(东坡、西坡和北坡)上的生物量分配和化学计量特征,来探究短命植物的适应策略。结果表明:(1)两种短命植物个体生物量在不同坡向上均差异显著,但涩荠在西坡的单株生物量最大(1.1±0.0134 g),而条叶庭荠在北坡的单株生物量最大(1.45±0.0113 g),东坡最小(0.5±0.0084 g)。(2)涩荠各器官的生物量分配均表现为叶>茎>繁殖器官>根,且在不同坡向上各器官分配比例相似;条叶庭荠各器官的生物量在不同坡向的分配均差异显著,且均表现为根部生物量显著低于其他器官(P<0.05),其中北坡繁殖器官的比例最大,东坡叶片的比例大,而西坡的根、茎、叶生物量所占比例差异不大。(3)两种短命植物在不同坡向的生物量与C、N、P化学计量呈极显著正相关关系。(4)两种短命植物在不同坡向的N/P均小于14,说明植物的生长受到N的限制;涩荠通过调整个体大小以适应不同环境,而条叶庭荠则是通过调整各器官的分配比例来适应变化的环境。研究认为,短命植物具有通过调整养分和生物量分配来适应荒漠环境的策略,在准噶尔荒漠区的低山丘陵地带,坡向是影响其生物量分配和化学计量特征的主要环境因子。
Ephemeral plants are an important part of the desert system in China,and slope direction is one of the most important topographic factors in Junggar Desert,which may affect the biomass and stoichiometric characteristics of ephemeral plants in this area.In this study,we detected the biomass allocation and stoichiometric characteristics of different organs(roots,stems,leaves and reproductive organs)of Malcolmia africana and Alyssum linifolium,two ephemeral plants of the Brassicaceae family,in different slope directions(east slope,west slope and north slope)to explore the adaptation strategies of ephemeral plants.The results showed that:(1)the plant biomass of two ephemeral plants was significantly different on different slopes,but the plant biomass of M.africana was the largest on the west slope(1.1±0.0134 g).The plant biomass of A.linifolium was the largest on the north slope(1.45±0.0113 g)and the smallest on the east slope(0.5±0.0084 g).(2)The biomass distribution of M.africana organs was expressed as the leaves>stems>propagating organs>roots,and the proportion of the organs was similar on different slopes.Biomass distribution of organs of A.linifolium was significantly different in different slope directions,and the biomass of roots was significantly lower than that of other organs(P<0.05),among which the northern slope had the largest proportion of reproductive organs,the eastern slope had a large proportion of leaves,while the western slope had little difference in the proportion of root,stem and leaf biomass.(3)Biomass of two ephemeral plants in different slope directions was significantly positively correlated with C,N and P stoichiometry.(4)The N/P values of the two ephemeral plants in different slope directions were all less than 14,indicating that the growth of plants was limited by N.M.africana adjusts its size to suit different environments,while A.linifolium adjusts the proportion of its organs to suit the changing environment.It suggested that ephemeral plants have a strategy to adapt to desert environment by adjusting nutrient and biomass allocation.In the low mountain and hilly areas of Junggar desert,slope orientation is the main environmental factor affecting biomass allocation and stoichiometric characteristics.
作者
张彩霞
赵文勤
党寒利
庄丽
孙辉
ZHANG Caixia;ZHAO Wenqin;DANG Hanli;ZHUANG Li;SUN Hui(College of Life Sciences,Shihezi University,Xinjiang Production and Construction Corps/Ministry of Education Jointly Build“Xinjiang Key Laboratory of Medicinal Plant Resources”,Shihezi,Xinjiang 832000,China;不详)
出处
《西北植物学报》
CAS
CSCD
北大核心
2021年第1期151-158,共8页
Acta Botanica Boreali-Occidentalia Sinica
基金
国家自然科学基金(41561010)
石河子大学自然科学研究与技术创新项目基金(RCZK201952)。
关键词
短命植物
生物量分配
化学计量特征
涩荠
条叶庭荠
ephemeral plant
biomass allocation
stoichiometry
Malcolmia africana
Alyssum linifolium
