干旱区生态环境知识资源中心(Arid): 5种川西北沙化地草本植物生态适应策略的差异性

Arid

	5种川西北沙化地草本植物生态适应策略的差异性
其他题名	Differences of ecological adaptation strategies of 5 herbs from the desertified grassland in the northwest Sichuan
	李莹 1; 曾晓琳 1; 游明鸿 2; 刘金平 1; 蔡捡 1
来源期刊	草业科学
ISSN	1001-0629
出版年	2016
卷号	33 期号:5 页码:843-850
中文摘要	以5种川西北沙化草地自然留存植物沙生苔草(Carex praeclara)、赖草(Leymus secalinus)、紫花列当(Orobanche coerulescens)、藏茴香(Carum carvi)和地八角(Astragalus bhotanensis)为研究对象,通过测定5种草地植物的表观性状、构件含水量和生物量及其分配,分析5种植物的生长发育、资源分配对沙化生境的响应差异,探讨5种植物对沙化地生境的应对策略与适应机理。结果表明,1)5种植物的表观性状具有极显著差异(P<0.01),沙生苔草通过冠幅,赖草通过根茎,地八角通过深根系,紫花列当和藏茴香通过扩大有性生殖来适应沙化生境。2)5种植物的含水量及其配比均存在极显著差异(P<0.01),沙生苔草、赖草和地八角的水分优先分配到生殖枝,紫花列当优先分配到茎叶,藏茴香则采用相对均衡的水分分配方式。3)5种植物的生物量及其分配也存在极显著差异(P<0.01),沙生苔草生物量优先分配到根茎,赖草优先分配到地上茎叶,紫花列当优先分配到生殖枝,地八角优先分配到根部,而藏茴香则相对均衡的分配生物量到各构件。5种沙生植物对资源权衡分配的方式不同,但均能通过表型可塑性、水分利用能力和生物量分配等应对策略来获取或分配有限的可利用资源,增加其对生境的适应性,得以在沙化草地中留存下来。
英文摘要	In the study,five species of natural herbs in the desertified grassland of northwest Sichuan,including Carex praeclara,Leymus secalinus,Orobanche coerulescens,Carum carvi and Astragalus bhotanensis,were selected to determine their adaptation strategies and mechanisms to desertification habitat by measuring apparent traits,water content,biomass and its allocation ratio,and analyzing the response of growth and development and resource allocation of different herbs to desertified habitats.The results of this study showed that apparent traits were extremely significant difference among five species of herbs(P<0.01),in which O.coerulescens and C.carvi adapted to desertification habitats by encouraging the sexual reproduction,however C.praeclara, L.secalinus and A.bhotanensis adapted to desertification habitats through crowns,rhizomes,and deep roots,respectively.Water content and its allocation proportion also were extremely significant difference among five species of herbs(P<0.01),in which the water content of C.praeclara,L.secalinus and A.bhotanensis preferentially assigned to reproductive branches,but O.coerulescens had priority to stems and leaves,and C.carvi usedthe water allocation with relative balance.Biomass and its allocation proportion showed aextremely significant difference among five species(P<0.01),indicating that the biomass of C.praeclara,L. secalinus,O.coerulescens and A.bhotanensis preferentially allocated to rhizomes,stems and leave,reproductive branches,and roots,respectively;however,C.carvi allocated the biomass to each component with relative balance.These suggested that five species of psammophytesshowed a difference strategies to trade off resource allocation and they obtained or allocated the limited available resources to increase the adaptability to habitat through varieties of phenotypic plasticity,water using ability and biomass allocation,etc.
中文关键词	沙化草地 ; 沙生植物 ; 表观性状 ; 水分分配 ; 适应策略
英文关键词	desertified grassland psammophytes apparent traits water allocation adaptation strategy
语种	中文
国家	中国
收录类别	CSCD
WOS类目	AGRICULTURE MULTIDISCIPLINARY
WOS研究方向	Agriculture
CSCD记录号	CSCD:5717018
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/233978
作者单位	1.西华师范大学生命科学院, 南充, 四川 637009, 中国; 2.四川省草原科学研究院, 成都, 四川 611731, 中国
推荐引用方式 GB/T 7714	李莹,曾晓琳,游明鸿,等. 5种川西北沙化地草本植物生态适应策略的差异性[J],2016,33(5):843-850.
APA	李莹,曾晓琳,游明鸿,刘金平,&蔡捡.(2016).5种川西北沙化地草本植物生态适应策略的差异性.草业科学,33(5),843-850.
MLA	李莹,et al."5种川西北沙化地草本植物生态适应策略的差异性".草业科学 33.5(2016):843-850.