干旱区生态环境知识资源中心(Arid): 塔里木河中游洪水漫溢区荒漠河岸林实生苗更新

Arid

	塔里木河中游洪水漫溢区荒漠河岸林实生苗更新
其他题名	Seedling recruitment in desert riparian forest following river flooding in the middle reaches of the Tarim River
	赵振勇; 张科; 卢磊; 周生斌; 张慧
来源期刊	生态学报
ISSN	1000-0933
出版年	2011
卷号	31 期号:12 页码:3322-3329
中文摘要	以塔里木河中游荒漠河岸林为研究对象,2008年6月至2009年8月,对洪水漫溢区河漫滩裸地、林下及林隙3种生境植物1年生实生苗进行了调查。结果表明:实生苗更新主要依赖洪水漫溢,在非漫溢区没有发现实生苗存在;洪水降低了漫溢区的土壤盐度,更重要的是其提供了宝贵的水分条件,在时间和水量上有效地满足了胡杨等植物种子萌发和幼株生长的水分需求;河漫滩是河岸林种子实生苗产生的基地,洪水漫溢后的河漫滩种子实生苗密度显著大于其余两生境内实生苗密度,同时该生境内物种多样性也显著高于林下和林隙生境;光照决定着漫溢区实生苗能否成林,光照不同的空间样点上,实生苗发生数量和个体生长均存在显著差异,光照强的河漫滩,实生苗发生数量较多且幼苗能保持较高的生长活力和较多的生物量积累。
英文摘要	Desert riparian forest is an important vegetation type of inland river valleys in the arid zone,and dominates the structure and function of riparian ecosystems,as well as the landscape vegetation patterns.The occurrence and development of riparian forests are closely related to river runoff,while stand composition and distribution patterns are affected strongly by the hydrological regime of rivers.Riparian forests commonly proliferate on initially bare flooded surfaces.Flooding was found to have an overriding effect on riparian plant communities,and riparian ecosystems in arid regions exhibit shifting patterns of vegetation in response to periodic flooding.Desert riparian forest dominated by Populus euphratica has a centralized distribution in the Tarim River Basin,China,with highest abundance in the middle reaches of the Tarim River.In recent decades,desert riparian forest has been degraded severely in the lower reaches of the Tarim River,in part owing to alteration of natural flow regimes and suppression of fluvial processes.The flooding control violates inherent laws of riparian forest development,and consequently natural regeneration of riparian forests is checked.Extensive efforts have been made in recent years to restore riparian forests by regulating the hydrological regime according to natural flow regimes.Riparian forest rehabilitation and stability primarily depend on whether the dominant species regenerates successfully.Therefore,P.euphratica plays an important role in rehabilitation of natural riparian forests.Populus euphratica can reproduce both sexually and vegetatively.As sexual reproduction is important to maintain intrapopulation genetic diversity,investigation of seedling recruitment is critical for effective forest conservation.In most riparian plant species,such as P.euphratica,adult individuals mainly depend on groundwater to exist,while seed germination and early establishment are always related to surface runoff.Seedling establishment is an important life-history phase of floodplain plants in relation to drought stress.While distribution,community composition and structure have been the subject of considerable research,few studies have investigated the contribution of flooding to riparian forest establishment.With the objective of verifying whether the relationship between seedling establishment and flooding could explain the spatial pattern and community dynamics of riparian forests,in this study the species composition,quantity,diversity and growth status of seedlings were compared in three habitats,namely floodplain,forest floor,and forest gap.Field investigation of seedling recruitment after flooding was carried out from June 2008 to August 2009 in the middle reaches of the Tarim River.Seedling recruitment mainly depended on flooding,with no seedlings developing in the sample plots that had not been flooded.Flooding reduces soil salinity and represents a combination of temporal and quantitative water supply for both germination and growth of riparian plants such as P.euphratica.The seedling density and species diversity on the floodplain were distinctly higher than those in the other two habitats in the seasonally flooded area.Light availability was a critical factor influencing the level of seedling recruitment.High illumination promoted seedling recruitment and the accumulation of biomass.
中文关键词	塔里木河 ; 洪水漫溢 ; 荒漠河岸林 ; 实生苗更新
英文关键词	Tarim River flooding desert riparian forest seedling recruitment
语种	中文
国家	中国
收录类别	CSCD
WOS类目	FORESTRY
WOS研究方向	Forestry
CSCD记录号	CSCD:4225633
来源机构	中国科学院新疆生态与地理研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/226935
作者单位	中国科学院新疆生态与地理研究所, 中国科学院绿洲生态与荒漠环境重点实验室, 乌鲁木齐, 新疆 830011, 中国
推荐引用方式 GB/T 7714	赵振勇,张科,卢磊,等. 塔里木河中游洪水漫溢区荒漠河岸林实生苗更新[J]. 中国科学院新疆生态与地理研究所,2011,31(12):3322-3329.
APA	赵振勇,张科,卢磊,周生斌,&张慧.(2011).塔里木河中游洪水漫溢区荒漠河岸林实生苗更新.生态学报,31(12),3322-3329.
MLA	赵振勇,et al."塔里木河中游洪水漫溢区荒漠河岸林实生苗更新".生态学报 31.12(2011):3322-3329.