干旱区生态环境知识资源中心(Arid): 毛乌素沙地两种典型灌木叶片凝结水吸收能力及吸水途径

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	毛乌素沙地两种典型灌木叶片凝结水吸收能力及吸水途径
其他题名	Foliar condensate absorption and its pathways of two typical shrub species in the Mu Us Desert
	桂子洋; 秦树高; 胡朝; 白凤; 石慧书; 张宇清
来源期刊	植物生态学报
ISSN	1005-264X
出版年	2021
卷号	45 期号:6 页码:583-593
中文摘要	凝结水是半干旱地区生态系统重要的水源,已有研究表明,一些沙生植物可以通过叶片吸收凝结水以改善其水分状况。该研究以毛乌素沙地典型沙生灌木黑沙蒿(又称油蒿)(Artemisia ordosica)和北沙柳(Salix psammophila)为研究对象,研究这两种植物的叶片是否具有吸收凝结水的能力,并探究叶片吸水的途径及运移的通道。分别将黑沙蒿与北沙柳失水和未失水离体枝条置入人工模拟加湿室中,使用高丰度氘水标记的凝结水进行浸润实验,比对浸润前后枝条质量、叶片水及茎水氢同位素丰度变化,确定黑沙蒿和北沙柳的叶片吸水能力;并将盆栽黑沙蒿和北沙柳整株置入人工模拟加湿室,使用荧光标记的凝结水进行浸润实验,比对浸润前后叶片、小枝荧光显像,确定黑沙蒿和北沙柳叶片吸收和运移凝结水的途径。结果显示: (1)黑沙蒿和北沙柳未失水枝条在浸润前后质量无显著差异,黑沙蒿和北沙柳失水离体枝条在凝结水浸润后质量显著提高了2.04%和6.74%,叶片水氘丰度提高了170.10和104.09,茎水氘丰度提高了10.52和12.72; (2)荧光标记凝结水浸润后,荧光示踪剂分布在黑沙蒿和北沙柳叶片的角质层、气孔、海绵组织、栅栏组织和维管束中,黑沙蒿叶片的厚角组织中也发现了荧光示踪剂,两种灌木小枝的表皮、韧皮部、木质部和髓中均观察到荧光。以上结果表明,毛乌素沙地两种典型灌木叶片均具有吸收凝结水的能力,水分亏缺植株的吸水能力更强;两种灌木叶片通过气孔或角质层吸收凝结水,并通过叶肉运移至维管束乃至小枝。黑沙蒿与北沙柳叶片具有的吸水功能可能是其适应干旱期水分亏缺的重要水分利用策略。
英文摘要	Aims Condensate is an important water source for plants in the ecosystems of drylands. Previous studies have found that some desert plants can absorb condensate via leaves. This study aimed to determine the capacity of the foliar condensate absorption of typical shrub species (Artemisia ordosica and Salix psammophila) in the Mu Us Desert, and to explore the pathways of foliar condensate absorption and transport. Methods The dehydrated and non-dehydrated detached shoots of A. ordosica and S. psammophila were placed in an artificial chamber and exposed to deuterium labelled condensate, and the foliar condensate absorption was determined by comparing the differences of shoot masses and isotopic signals between pre- and post-immersion. The potted whole plants of A. ordosica and S. psammophila were placed in an artificial chamber and exposed to fluorescent tracer solution, and the pathways of foliar water uptake and transport were determined by comparing the differences of fluorescent tracing in leaves and twigs between pre- and post-immersion. Important findings (1) After the deuterium labelled dew exposure, no significant differences were found in shoot masses between pre- and post-immersion of non-dehydrated detached shoots of A. ordosica and S. psammophila. However, the dehydrated shoot masses significantly increased by 2.04% and 6.74% in A. ordosica and S. psammophila, respectively; the deltaD (stable isotope ratio of hydrogen) of leaf water increased by 170.10 and 104.09 in A. ordosica and S. psammophila, respectively; and the deltaD of xylem water increased by 10.52 and 12.72 in A. ordosica and S. psammophila, respectively. (2) After the fluorescent tracer solution exposure, fluorescence was observed in the cuticles, stomata, spongy mesophyll, palisade cells and vascular bundle of the leaves of A. ordosica and S. psammophila. The fluorescence was also found in collenchyma of the leaves of A. ordosica. In addition, the fluorescence was observed in phloem, xylem, and pith of twigs of two shrub species. This study found that two typical shrub species in the Mu Us Desert had the capacity to absorb condensate via their leaves, and the plants undergoing water stress had the higher capacity of foliar condensate absorption. The leaves of A. ordosica and S. psammophila absorbed condensate through cuticles or stomata, and the absorbed water was transported to vascular bundle and even twigs. Foliar condensate absorption may be an important water use strategy to survive for A. ordosica and S. psammophila during dry periods.
中文关键词	黑沙蒿 ; 北沙柳 ; 叶片吸水 ; 凝结水 ; 水分利用策略
英文关键词	Artemisia ordosica Salix psammophila foliar condensate absorption condensate water use strategy
类型	Article
语种	中文
开放获取类型	gold
收录类别	CSCD
WOS类目	Forestry
CSCD记录号	CSCD:7048316
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/378046
作者单位	桂子洋, 北京林业大学水土保持学院, 宁夏盐池毛乌素沙地生态系统国家定位观测研究站, 北京 100083, 中国.; 胡朝, 北京林业大学水土保持学院, 宁夏盐池毛乌素沙地生态系统国家定位观测研究站, 北京 100083, 中国.; 白凤, 北京林业大学水土保持学院, 宁夏盐池毛乌素沙地生态系统国家定位观测研究站, 北京 100083, 中国.; 秦树高, 北京林业大学水土保持学院;;北京林业大学, 宁夏盐池毛乌素沙地生态系统国家定位观测研究站;;水土保持国家林业和草原局重点实验室, ;;, 北京;;北京 100083;;100083, 中国.; 张宇清, 北京林业大学水土保持学院;;北京林业大学, 宁夏盐池毛乌素沙地生态系统国家定位观测研究站;;水土保持国家林业和草原局重点实验室, ;;, 北京;;北京 100083;;100083, 中国.; 石慧书, 宁夏哈巴湖国家级自然保护区管理局, 盐池, 宁夏 751500, 中国.
推荐引用方式 GB/T 7714	桂子洋,秦树高,胡朝,等. 毛乌素沙地两种典型灌木叶片凝结水吸收能力及吸水途径[J],2021,45(6):583-593.
APA	桂子洋,秦树高,胡朝,白凤,石慧书,&张宇清.(2021).毛乌素沙地两种典型灌木叶片凝结水吸收能力及吸水途径.植物生态学报,45(6),583-593.
MLA	桂子洋,et al."毛乌素沙地两种典型灌木叶片凝结水吸收能力及吸水途径".植物生态学报 45.6(2021):583-593.