干旱区生态环境知识资源中心(Arid): 荒漠草原不同大小土岛生境中短花针茅种群小尺度点格局分析

Arid

	荒漠草原不同大小土岛生境中短花针茅种群小尺度点格局分析
其他题名	Fine-scale spatial point patterns of Stipa breviflora population at differentSoil Islandhabitat sizes in desert steppe
	薛毅 1; 王兴 2; 宋乃平1 ; 随金明 1; 陈娟 1
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:2 页码:211-220
中文摘要	荒漠草原经过长期人为、自然等因素的干扰引起原始生境退化、破碎化,形成原生硬质灰钙土斑块并散布在广大沙化土地中,类似岛状的土被结构,我们称之为土岛。为研究不同大小土岛生境对优势种短花针茅种群空间格局的影响,2016年9月在宁夏盐池县杨寨子村选取大(200~300m~2)、中(约100m~2)、小(约50m~2)土岛各3个,共9个土岛,然后在每个土岛上选取一个2m*2m样方开展研究。结果表明:1)所有土岛上的短花针茅种群均处于老龄衰退阶段,幼龄小苗极少。2)随着土岛面积增大,土岛内部0~40cm土层的土壤黏粉粒含量呈现增加趋势(P<0.05),细砂粒含量逐渐减少(P<0.05),土壤有机碳含量在不同土层均有所增加(P<0.05)。3)小土岛上的短花针茅种群主要表现为聚集分布,随着土岛面积的增大,短花针茅种群的生态对策发生转变,在大、中土岛上变成以随机分布为主。4)在各土岛上,短花针茅都为优势种,随着土岛面积增大,短花针茅种群密度表现为先增加后减小,推测短花针茅的最适土岛生境面积大约为100m~2。此次研究表明,随着土岛生境不断缩小,短花针茅种群点格局从随机分布变为聚集分布,种群的生存状况受到极大威胁,说明荒漠草原典型植被的这种原始生境破碎化可能会引起种群的衰退甚至消失。今后在对荒漠草原的原始植被进行保护时,首先应当保障其生境的完整性、连续性,进而保障典型植被种群的规模。
英文摘要	Through long-term natural factors and human disturbance,the natural habitats of desert steppe become degradation and fragmentation,forming natural hard sierozem patches which were similar to islands in the extensive sandy desertified land,which were named asSoil Island.In order to study the influence of differentSoil Islandhabitat areas on the spatial pattern of Stipa breviflora,we chose three largeSoil Island(200-300 m~2),three middleSoil Island(about 100 m~2) and three smallSoil Island(about 50 m~2) habitats,and set one 2 m*2 m sample plot in eachSoil Islandin September 2016.The results showed that:1) S.breviflora population was in the aging and declining stage in the all ofSoil Island habitats,with very few young seedlings.2) With the increase of the area ofSoil Island,the content of clay silts in the 0-40 cm soil layer increased (P<0.05),and the content of fine sand in the 0-40 cm soil layer decreased (P<0.05),and the content of soil organic content (SOC) in different soil layers increased (P<0.05).3) With the increase of the area ofSoil Island,the ecological strategy of S.breviflora population changed.In the smallSoil Island,the spatial patterns of S.breviflora aggregated mainly.But in the largeSoil Islandand middleSoil Island,the spatial patterns of S.breviflora were mainly random.4) In eachSoil Island,S.breviflora was the dominant species.With the increase of the area ofSoil Island,the density of S.breviflora population increased first and then decreased,so we guessed that the optimum area ofSoil Islandhabitat was about 100 m~2.In summary,with the continuous reduce of the habitat areas ofSoil Island,the spatial pattern of S.breviflora population changes from a random distribution to an aggregated distribution,and its population size and survival are under great threat,which indicates that the fragmentation of typical vegetation habitat will make population decline or even disappear.In the future,the integrity and continuity of the habitat should be guaranteed first,and then the size of the typical vegetation population could be guaranteed for the protection of the native vegetation of desert steppe.
中文关键词	荒漠草原 ; 短花针茅 ; 点格局 ; 土岛 ; 土壤
英文关键词	desert steppe Stipa breviflora point pattern Soil Island soil
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:6497348
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/2XILL650/239697
作者单位	1.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, 银川, 宁夏 750021, 中国; 2.宁夏大学农学院, 银川, 宁夏 750021, 中国
推荐引用方式 GB/T 7714	薛毅,王兴,宋乃平,等. 荒漠草原不同大小土岛生境中短花针茅种群小尺度点格局分析[J]. 宁夏大学,2019,45(2):211-220.
APA	薛毅,王兴,宋乃平,随金明,&陈娟.(2019).荒漠草原不同大小土岛生境中短花针茅种群小尺度点格局分析.浙江大学学报. 农业与生命科学版,45(2),211-220.
MLA	薛毅,et al."荒漠草原不同大小土岛生境中短花针茅种群小尺度点格局分析".浙江大学学报. 农业与生命科学版 45.2(2019):211-220.