干旱区生态环境知识资源中心(Arid): 浑善达克沙地三种生境中不同植物的水分生理生态特征

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	浑善达克沙地三种生境中不同植物的水分生理生态特征
其他题名	Hydrological characteristics of different species in three habitats of Hunshandak Sandland
	刘美珍; 蒋高明; 李永庚; 牛书丽; 高雷鸣
来源期刊	生态学报
ISSN	1000-0933
出版年	2004
卷号	24 期号:7 页码:1465-1471
中文摘要	对浑善达克沙地固定沙丘、丘间低地和湿地3种生境中83种植物的叶片渗透势(Psis)和含水量(LWC)进行了对比研究,结果表明: 各生境下植物Psis之间差异显著(P<0.01).固定沙丘的小叶锦鸡儿(Caragana microphylla)Psis最低,为-6.54MPa;湿地的湿车前(Plantago cornuti)最高,为-0.63MPa.43%的植物Psis变化于-1.00 至 -1.99MPa之间,33 %的植物变化范围为-2.00至-2.99MPa.LWC变化也很大,小叶锦鸡儿最低,为26%;而碱蓬(Suaeda glauca)和钝叶瓦松(Orostachys malacophyllus)的则很高,分别为9 8%和97%.统计表明,85%植物LWC变化于60%至89%之间.就生活型而言,灌木Psis 最低,乔木次之,草本植物最高.在不同生境中,植物Psis随生境土壤水势(Psi soil) 升高而增加,其中乔木和灌木Psis变化趋势为:固定沙丘<丘间低地(P <0.01);草本植物为:固定沙丘<丘间低地<湿地(P<0.01).叶片含水量随生活型及生境的变化与渗透势相似.植物叶片渗透势与根系分布深度呈极显著负相关 (P<0.001) ,而叶片渗透势与含水量呈显著正相关(P<0.01).
英文摘要	Hunshandak Sandland in Inner Mongolia of China distributes in typical grassland. It is often sensitive to environmental changes, also lack, of precipitation that restricts to the native plants to develop regularly. However, over grazing has induced serious grassland degradation in the past few decades here. For the serious sandstorm occurred frequently in north China, Hunshandak Sandland has been widely blamed as one of sandstorm centers. Therefore, it is urgent to take imperative measures for the restoration of degraded land there. For this purpose, the natural plant species should be the first’ selection rather than introducing merely exotic species. As far as natural vegetation is concerned, water is the most restrictive factor in controlling the growth and distribution of plant species in an arid or semi-arid region. So it is necessary to explore the hydrological and other relative features characteristics of the natural in order to fully understand how the native plants response to their habitats. Also such findings will offer the scientific basis for the restoration of the degraded sandlands. Hence, in this paper, the leaf osmotic potential (psi_s) and leaf water content (LWC) of 83 species have been investigated in the three main habitats of Hunshandak sandland, i. e. fixed sand dune, lowland and wetland. The relationships between psi_s of individual plant and its rooting depth, LWC, as well as growth forms and habitats were also examined. The psi_s values of the 83 species varied from -6. 54 MPa (Caragana micropkylla) to - 0.63MPa (Plantago cornuti)(P<0. 01). Among all species measured, 43% had the value of psi_s from -1.00 MPa to -1.99 MPa, 33% between -2.99 and -2.OOMPa, 18% above - 1. OOMPa and 6% below -3. OOMPa. LWC varied from 26% of Caragana microphylla in fixed sand dune to 98% of Suaeda glauca at lowland. Orostachys malacophyllus with CAM photosynthetic pathway also had a high LWC of 97%. LWC values of 85% species were between 60% and 89%. For different growth forms, shrubs usually had the lowest psi_s, while grasses showed the highest values. In fixed sand dune and lowland, the psi_s, values of different growth forms were ordered as follows: shrubs < trees < grasses (P<0. 01). Accordingly, similar trends were noted in LWC of different growth forms. psi_s increased when the soil water potential (psi_(soil)) elevated from fixed sand dune, via lowland to wetland. For grasses, the order appeared, fixed sand dune
中文关键词	渗透势 ; 叶片含水量 ; 生境 ; 根系深度 ; 生活型 ; 浑善达克
英文关键词	leaf osmotic potentials leaf water content rooting depth habitats growth forms Hunshandak Sandland
语种	中文
国家	中国
收录类别	CSCD
WOS类目	AGRICULTURE MULTIDISCIPLINARY
WOS研究方向	Agriculture
CSCD记录号	CSCD:1588062
来源机构	中国科学院植物研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/205369
作者单位	中国科学院植物研究所, 植被数量生态学开放研究实验室, 北京 100093, 中国
推荐引用方式 GB/T 7714	刘美珍,蒋高明,李永庚,等. 浑善达克沙地三种生境中不同植物的水分生理生态特征[J]. 中国科学院植物研究所,2004,24(7):1465-1471.
APA	刘美珍,蒋高明,李永庚,牛书丽,&高雷鸣.(2004).浑善达克沙地三种生境中不同植物的水分生理生态特征.生态学报,24(7),1465-1471.
MLA	刘美珍,et al."浑善达克沙地三种生境中不同植物的水分生理生态特征".生态学报 24.7(2004):1465-1471.