干旱区生态环境知识资源中心(Arid): 不同干扰程度下沙生植物异翅独尾草的种群结构与动态特征

Arid

	不同干扰程度下沙生植物异翅独尾草的种群结构与动态特征
其他题名	Structural and dynamic characteristics of Eremurus anisopterus populations in areas with different levels of disturbance
	安静; 吴玲; 王海娟; 段呈; 王绍明
来源期刊	生态学报
ISSN	1000-0933
出版年	2017
卷号	37 期号:6 页码:2023-2032
中文摘要	不断加剧的人类活动导致古尔班通古特沙漠南缘异翅独尾草(Eremurus anisopterus (Kar.et Kir.) Regel)生存生境片段化,形成许多大小不一的斑块种群。为深刻理解在不同程度破碎化斑块中异翅独尾草种群的生存现状,共选取19个样点,分析其龄级结构,编制静态生命表,绘制存活曲线和死亡曲线,并引入4个生存分析函数。结果表明:古尔班通古特沙漠南缘不同样地中异翅独尾草种群动态因人类干扰与生境破碎化程度的差异,呈现为不同的结构特征及变化趋势,各样地异翅独尾草种群龄级完整性均不同,破碎化程度高的样地中种群的龄级有残缺或断代现象;人类干扰程度中、弱的b类型、c类型斑块的种群年龄结构分别属于稳定至衰退型和增长型,而受干扰最强的a类型斑块中的种群结构表现出较强的波动性,种群趋于衰退的风险较高;存活曲线与4个生存函数曲线表明,a类型种群前、中期稳定,后期衰退; b类型种群前期衰退,中、后期稳定; c类型种群稳定增长。说明异翅独尾草种群的衰退可能是其生境破碎化引起的,因此,对于人类干扰程度强的衰退型种群应亟需减少人为干扰,依据不同生境中的干扰因素及种群生存现状,制定科学与切实可行的保护、恢复策略。
英文摘要	Eremurus anisopterus (Liliaceae) is a perennial ephemeral geophyte herb. In China,E. anisopterus grows on fixed and semi-fixed sand dunes of the Gurbantunggut Desert of Xinjiang Uyghur Autonomous Region. This kind of ephemeral plant contributes greatly to the stabilization of sand. But increasing human activity has fragmented the primary habitat of the E. anisopterus population in the southern Gurbantunggut Desert,resulting in numerous separate population patches. And the frequent human activities,including engineering,reclamation of waste land,industrial discharge and over grazing,severely influence the survival and reproduction of ephemeral plants,more and more ephemeral plants are dying out. The goal of our study was to determine the current survival rates of E. anisopterus populations in different patches. Therefore,we surveyed 19 plots and analyzed age structure,constructed a time-specific life table,produced survivorship and mortality curves,as well as survival analysis function curves. Our results indicated that because of the various levels of human disturbance and habitat fragmentation,population dynamics of E. anisopterus in the 19 plots exhibited different structural features and trends. The age structure of E. anisopterus populations differed among the plots. The age classes within the populations were incomplete,and this phenomenon occurred more frequently in the plots in highly fragmented areas. The age structure of the b-type and c-type patches,based on the degree of fragmentation and human disturbance, exhibited a stable to declining growth trend. Population structure of the a-type patches in the most disturbed areas exhibited greater instability,with the population at higher risk of decline. The a-type population exhibited stability in the early and populations,declines in the early phase and stability in the intermediate and later phases occurred,whereas the c-type populations were stable. Therefore,it is critical to decrease or halt external disturbances in areas subjected to the greatest levels of human intermediate phases according to the survivorship curve,and in the early,intermediate,and later phases according to the survival analysis function curve. The plant population structure is the common result of the survivability of individuals and the impact of environmental conditions,and may also provide important information on the past and present regeneration of species. So the decline in E. anisopterus populations likely resulted from habitat loss in the later phase. For the b-type disturbance. Studies should examine the effects of different combinations of disturbance factors on population status in different habitats to formulate scientific and practical protection and recovery strategies.
中文关键词	破碎化 ; 异翅独尾草 ; 年龄结构 ; 生命表 ; 存活曲线
英文关键词	habitat fragmentation Eremurus anisopterus age structure life table survival curve
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:5959155
来源机构	石河子大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/236455
作者单位	石河子大学生命科学学院, 石河子, 新疆 832000, 中国
推荐引用方式 GB/T 7714	安静,吴玲,王海娟,等. 不同干扰程度下沙生植物异翅独尾草的种群结构与动态特征[J]. 石河子大学,2017,37(6):2023-2032.
APA	安静,吴玲,王海娟,段呈,&王绍明.(2017).不同干扰程度下沙生植物异翅独尾草的种群结构与动态特征.生态学报,37(6),2023-2032.
MLA	安静,et al."不同干扰程度下沙生植物异翅独尾草的种群结构与动态特征".生态学报 37.6(2017):2023-2032.