干旱区生态环境知识资源中心(Arid): 荒漠草原人工柠条林草本层植被的结构与动态

Arid

	荒漠草原人工柠条林草本层植被的结构与动态
其他题名	Structure and dynamics of herbaceous layer vegetation of artificial Caragana intermedia shrublands in desert steppe
	赵伟; 杨明秀; 陈林; 王磊; 宋乃平; 杨新国
来源期刊	浙江大学学报. 农业与生命科学版
ISSN	1008-9209
出版年	2015
卷号	41 期号:6 页码:723-731
中文摘要	为系统认识柠条林草本层植被的物种组成特征及其动态变化规律,把握灌草结构及人工林系统的演变趋势,采用空间换时间的方法,以天然草地为对照,搭建一个由不同林龄样地构成的研究序列,并开展灌丛内外植被季节性动态的跟踪监测与分析。结果表明:1)对照草地和柠条林地草本层物种共计25种,分属于8个科23个属。16 a柠条林物种数最多(16种),随着林龄的增大,物种数逐渐减少,中亚白草和隐子草等多年生禾草开始出现,但是优势种以一年生短命植物为主。物种多样性指数则随林龄增长呈先增长后下降的趋势。2)草本层植被盖度、生物量与物种数的季节动态主要受降水、气温变化的影响,但是灌丛的存在显著延滞了草本层植被经历春季干旱后的生长恢复速度,并以25 a柠条林的生长节律变化最为突出。3)林龄显著改变了灌丛内外草本层植被盖度以及灌丛内草本层植被生物量的季节动态,林龄与季节因子间存在显著的交互作用。综上所述,荒漠草原人工柠条林草本层植被的结构与动态是林龄、季节以及空间异质性等因子交互作用下的产物,伴随人工柠条林的衰败,群落存在逐步向地带性植被演替的趋势,但是在以一年生短命植物为主要优势物种情况下,系统稳定性的维持和演替方向还存在诸多的不确定性。
英文摘要	Caragana intermedia is a leguminous shrub plant, which is planted in desert steppe area on a large scale, which can also be used as forage grass, with very important ecological and economic value. However, a series of shrub and grass resource competition problem emerged with the aging of C. intermedia shrublands. The growth of zonal perennial vegetation often subjected to great constraints, and self-degradation of C. intermedia shrublands was also developed to different degrees. The reasonable collocation relations of shrub and grass were one of the key elements to maintain ecology and production services of C. intermedia shrublands in desert steppe. The objective of this study is to understand composition characteristics of herbaceous plant species and its dynamic change rules around the C. intermedia shrublands, and to reveal the structure of shrub and grass and the evolution trend of C. intermedia shrubland system. Taking natural grassland as a control, spatiotemporal substitution methods were used, and a research sequence constituted of different ages of C. intermedia shrubland plots was erected to carry out tracking, monitoring and analysis of vegetation seasonal dynamics at interior and exterior of the shrubs. The results showed that: 1) The number of natural grassland (CK) and herbaceous plant species of C. intermedia shrublands were 25 species, belonging to 8 families and 23 genera. The highest species number was the 16 a C. intermedia shrublands (16 species), and the number of species gradually decreased with aging of C. intermedia shrublands. Pennisetum centrasiaticum, Cleistogenes squarrosa and other perennial grasses began to appear, but the dominant species still was short-lived annual plants. Species diversity indexes showed a decreasing trend after a steady increase with aging of C. intermedia shrublands. 2) The seasonal dynamics, coverage degree, aboveground biomass and species number of herbaceous layer vegetation were mainly affected by the change of precipitation and temperature, but the existence of C. intermedia shrubs delayed the growth recovery rate of herbaceous layer vegetation after spring drought, and the highest relative volatility index was 25 a C. intermedia shrublands. 3) The coverage degree of herbaceous layer vegetation at the interior and exterior of the C. intermedia shrubs and the seasonal dynamics of aboveground biomass at the interior of the C. intermedia shrubs were significantly changed by the ages of C. intermedia shrubland, and a significant interaction between ages of C. intermedia shrublands and seasonal factors was observed. In conclusion, the structure and dynamics of herbaceous layer vegetation of C. intermedia shrublands in desert steppe is regulated by the ages of C. intermedia shrublands, season and spatial heterogeneity and so on. With the decay of C. intermedia shrublands, the community gradually grows towards zonal vegetation succession, but under the circumstance of short-lived annual plants as dominant species, maintenance of system stability and succession direction still has many uncertainties.
中文关键词	荒漠草原 ; 人工柠条林 ; 林龄 ; 季节动态 ; 草本层植被
英文关键词	desert steppe artificial Caragana intermedia shrublands age of shrublands seasonal dynamics herbaceous layer vegetation
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:5593307
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/2XILL650/233618
作者单位	宁夏大学, 西北土地退化与生态恢复国家重点实验室培育基地;;西北退化生态系统恢复与重建教育部重点实验室, 银川, 宁夏 750021, 中国
推荐引用方式 GB/T 7714	赵伟,杨明秀,陈林,等. 荒漠草原人工柠条林草本层植被的结构与动态[J]. 宁夏大学,2015,41(6):723-731.
APA	赵伟,杨明秀,陈林,王磊,宋乃平,&杨新国.(2015).荒漠草原人工柠条林草本层植被的结构与动态.浙江大学学报. 农业与生命科学版,41(6),723-731.
MLA	赵伟,et al."荒漠草原人工柠条林草本层植被的结构与动态".浙江大学学报. 农业与生命科学版 41.6(2015):723-731.