干旱区生态环境知识资源中心(Arid): 新疆艾比湖湿地自然保护区荒漠优势种体内的水分来源

Arid

	新疆艾比湖湿地自然保护区荒漠优势种体内的水分来源
其他题名	Water sources of dominant desert species in ebinur lake wetland nature reserve, Xinjiang, China
	马辉英 1; 杨晓东 1; 吕光辉2 ; 何学敏 2; 张雪妮 2; 汪溪远 1; 李岩 2
来源期刊	生态学报
ISSN	1000-0933
出版年	2017
卷号	37 期号:3 页码:829-840
中文摘要	植物体内各水分来源的比例反映植物的适应特征,在水分作为限制因子的荒漠区,其更是物种间生态位分化、荒漠多样性维持的重要机理之一。通过检测艾比湖湿地自然保护区内4个生境(荒漠、河岸林、盐沼地和沙丘)的8科14种优势种的木质部,以及当地河水、地下水、4层不同深度(0-40,40-70,70-100 cm和100-150 cm)土壤水的稳定氧同位素值(delta~(18)O),估算各物种和各科植物体内各种水分来源的比例,随后依据根系的空间位置再将14种植物分成13个中深根系和1个浅根系物种,进一步利用delta~(18)O值分析深浅根系植物间的水分差别,以及各水源间的补给关系。结果表明:(1)艾比湖湿地自然保护区内,不同物种体内水分来源存在差别。将所有优势物种按科属归类后,类似物种水平,不同科属植物体内的水分来源也存在差别;(2)地下水是大部分植物的主要补给水源,多数植物很少利用0-40 cm表层土壤水;(3)深浅根系植物的水分来源不同,深根系植物主要利用地下水和河水,而浅根系植物主要利用土壤水;(4)艾比湖湿地自然保护区内,地下水补给河水,随后两者共同从土壤深层至浅层依次补给土壤水。综上可知:干旱荒漠内,水源可利用性的多样化,导致不同区域植物体内各水分来源的比例存在差别。在离河岸距离、地下水位高低、土壤表层盐渍化程度等因素的综合影响下,多年生和盐渍环境生长的植物,趋向于吸收地下水、河水和深层土壤水,相反,一年生或短命植物趋向于利用其能触及到的各种水源。
英文摘要	The proportions of water sources in plants are related to plant adaptation, and reflect the mechanisms of niche differentiation and diversity in arid desert regions. At present, traditional physical methods is hard to determine the proportions of water sources in plants. But,due to the stable isotopes does not existed fractionation when it transported from the roots to the leaves, the stable hydrogen -oxygen isotope content (delta~(18)O and deltaD) were essentially unchanged among roots,xylem,and the water sources. This resulted in the hydrogen-oxygen stable isotope analysis as a tool for accurately identifying the proportions of water sources in plants. In the present study, delta~(18)O of the xylem of 14 dominant desert species in 8 families (including Apocynaceae, Chenopodiaceae, Tamaricaceae, Leguminosae, Salicaceae, Zygophyllaceae, Compositae and Polygonaceae),river water, groundwater, and 4 layers soil water (including 0-40,40-70,70-100, and 100-150 cm) were measured respectively in desert, riparian forest, salt marsh, and sand dunes of Ebinur Lake Wetland Nature Reserve, Xinjiang, China. Based on the roots distribution and delta~(18)O,14 dominant desert species were firstly classified into 13 deep-rooted species and 1 shallow-rooted species, and then the proportions of water sources in plants, the differences of water utilization strategies between the deep- and shallow-rooted plants,and the replenishment relationships among water sources were analyzed. The results showed that: (1) the proportions of water sources in plants were different among species and families in the Ebinur Lake Wetland Nature Reserve; (2) groundwater occupied the largest proportion in water sources in plants,whereas the 0-40-cm layer soil water was rarely used; (3) the proportions of water sources in plants differed between deep- and shallow-rooted plants. Groundwater and river water were the main sources for deep-rooted plants, whereas the soil water was the primary source for shallow-rooted plants; (4) groundwater contributed to river supply, and subsequently,these two waters were discharged into the soil waters from deep to shallow soil layers; (5) atmospheric condensed waters as a special precipitation in arid desert, to some extent, it also discharged into the soil water, river water and groundwater. Overall,in the arid desert region,the diversity of availability in water sources showed a large variation in the proportions of water sources in plants among species and families. Additionally, under the comprehensive influences of the distance from habitat to riverbank,groundwater levels,and soil salinization levels,the perennials and halophytes mainly absorbed the groundwater, river water, and deep soil water. On the contrary, the annuals and ephemeral plants utilized all water sources that could be reached and absorbed by their roots.
中文关键词	水分来源 ; 深根系植物 ; 浅根系植物 ; 荒漠 ; 大气凝结水
英文关键词	delta~(18)O water sources delta~(18)O deep-rooted plants shallow-rooted plants desert atmospheric condensed waters
语种	中文
国家	中国
收录类别	CSCD
WOS类目	PLANT SCIENCES
WOS研究方向	Plant Sciences
CSCD记录号	CSCD:5924593
来源机构	新疆大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/236439
作者单位	1.新疆大学资源与环境科学学院, 绿洲生态教育部重点实验室;;智慧城市与环境建模新疆自治区普通高校重点实验室, 乌鲁木齐, 新疆 830046, 中国; 2.新疆大学资源与环境科学学院, 绿洲生态教育部重点实验室, 乌鲁木齐, 新疆 830046, 中国
推荐引用方式 GB/T 7714	马辉英,杨晓东,吕光辉,等. 新疆艾比湖湿地自然保护区荒漠优势种体内的水分来源[J]. 新疆大学,2017,37(3):829-840.
APA	马辉英.,杨晓东.,吕光辉.,何学敏.,张雪妮.,...&李岩.(2017).新疆艾比湖湿地自然保护区荒漠优势种体内的水分来源.生态学报,37(3),829-840.
MLA	马辉英,et al."新疆艾比湖湿地自然保护区荒漠优势种体内的水分来源".生态学报 37.3(2017):829-840.