干旱区生态环境知识资源中心(Arid): 宁夏荒漠草原典型群落的植被特征及其优势植物的水分利用效率

Arid

	宁夏荒漠草原典型群落的植被特征及其优势植物的水分利用效率
其他题名	Characteristic of typical vegetation community and water use efficiency of dominant plants in desert steppe of Ningxia
	胡海英; 李惠霞; 倪彪; 师斌; 许冬梅; 谢应忠
来源期刊	浙江大学学报. 农业与生命科学版
ISSN	1008-9209
出版年	2019
卷号	45 期号:4 页码:460-471
中文摘要	通过系统调查宁夏盐池县研究区在雨季前后蒙古冰草(Agropyron mongolicum)、甘草(Glycyrrhiza uralensis)和短花针茅(Stipa breviflora)群落植被特征,分析研究群落生境土壤含水量、优势植物叶片的碳稳定同位素组成(carbon stable isotopic composition, delta~(13)C)、叶片相对含水量和脯氨酸含量的变化,探讨荒漠草原植物群落特征和植物对水分利用的差异,为荒漠草原地区优良乡土牧草的筛选和利用提供理论与技术依据。结果表明:蒙古冰草、甘草、短花针茅和牛枝子(Lespedeza potaninii)为群落优势种,猪毛蒿(Artemisia scoparia)为主要伴生种,群落中C3植物居多,优势种均为C3植物。雨季期间降水量使群落物种丰富度、多样性指数及土壤含水量均明显增加。降水量对上述5种植物叶片的delta~(13)C值、脯氨酸含量和相对含水量的影响显著,且与不同物种之间有显著的交互作用,5种植物之间也呈现显著的种间差异。其中,甘草的水分利用效率最高,蒙古冰草的抗脱水能力较强,牛枝子和猪毛蒿具有较强的渗透调节能力,短花针茅具有稳定的水分利用效率。由相关性分析可知,植物的delta~(13)C值与土壤含水量呈极显著负相关,与叶片脯氨酸含量和相对含水量呈显著正相关。总之,降水量显著影响了群落植被物种组成数量、结构及优势植物的水分利用效率和利用方式,其中,甘草最节水,猪毛蒿和短花针茅的水分利用比较保守,蒙古冰草和牛枝子具有灵活的用水模式。
英文摘要	The aim of this study was to provide a theoretical and technical basis for the selection and utilization of native grass by discussing the water use efficiency of dominant plants, and the vegetative characteristics of the Agropyron mongolicum, Glycyrrhiza uralensis and Stipa breviflora communities responding to different precipitation amounts in desert steppe of Ningxia. The field investigation and experiment were carried out; and carbon stable isotopic composition (delta~(13)C) value, proline content and relative water content (RWC) of plant leaves were measured. The results showed that A. mongolicum, G. uralensis, S. breviflora and Lespedeza potaninii were the dominant species in the community with a large number of Artemisia scoparia, and they were all C3 plants. With the increase of precipitation amount during the rainy season, the species richness, diversity indexes of these three communities and the soil water content increased significantly. There were significant effects on the leaf delta~(13)C value, proline content and relative water content due to different precipitation amounts, and had significant interaction with different species, indicating that there were significant differences among these five species. In comparison, the water-use efficiency of G. uralensis was the highest; the anti-dehydration ability of A. mongolicum was the stronger than that of the others; the osmotic regulation ability of L. potaninii and A. scoparia was strong; and the water-use efficiency of S. breviflora was stable. The delta~(13)C value of dominant plants was with significantly negative correlation to the soil water content, and with significantly positive correlation to the proline content, as well as the relative water content of leaves. Overall, precipitation significantly affected the community species composition, structure, and water use efficiency of dominant plants. Glycyrrhiza uralensis had a more water-saving trait, while S. breviflora and A. scoparia exhibited a moreconservativewater use pattern, and A. mongolicum and L. potaninii had a flexible water use pattern.
中文关键词	荒漠草原 ; 群落特征 ; 优势植物 ; 碳稳定同位素组成 ; 水分利用效率
英文关键词	desert steppe vegetative characteristics dominant plant carbon stable isotopic composition water use efficiency
语种	中文
收录类别	CSCD
WOS类目	PLANT SCIENCES
WOS研究方向	Plant Sciences
CSCD记录号	CSCD:6573372
来源机构	宁夏大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/316161
作者单位	宁夏大学农学院, 银川, 宁夏 750021, 中国
推荐引用方式 GB/T 7714	胡海英,李惠霞,倪彪,等. 宁夏荒漠草原典型群落的植被特征及其优势植物的水分利用效率[J]. 宁夏大学,2019,45(4):460-471.
APA	胡海英,李惠霞,倪彪,师斌,许冬梅,&谢应忠.(2019).宁夏荒漠草原典型群落的植被特征及其优势植物的水分利用效率.浙江大学学报. 农业与生命科学版,45(4),460-471.
MLA	胡海英,et al."宁夏荒漠草原典型群落的植被特征及其优势植物的水分利用效率".浙江大学学报. 农业与生命科学版 45.4(2019):460-471.