草业科学2016，Vol.33Issue(5)：843-850,8.DOI:10.11829/j.issn.1001-0629.2015-0506
5种川西北沙化地草本植物生态适应策略的差异性
Differences of ecological adaptation strategies of 5 herbs from the desertified grassland in the northwest Sichuan
摘要
Abstract
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 appar-ent traits,water content,biomass and its allocation ratio,and analyzing the response of growth and develop-ment and resource allocation of different herbs to desertified habitats.The results of this study showed that ap-parent traits were extremely significant difference among five species of herbs(P<0.01),in which O.coerules-cens and C.carvi adapted to desertification habitats by encouraging the sexual reproduction,however C.prae-clara,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 a-mong five species of herbs(P<0.01),in which the water content of C.praeclara,L.secalinus and A.bho-tanensis preferentially assigned to reproductive branches,but O.coerulescens had priority to stems and leaves, and C.carvi used the water allocation with relative balance.Biomass and its allocation proportion showed aex-tremely 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,reproduc-tive branches,and roots,respectively;however,C.carvi allocated the biomass to each component with rela-tive balance.These suggested that five species of psammophytesshowed a difference strategies to trade off re-source 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.关键词
沙化草地/沙生植物/表观性状/水分分配/适应策略Key words
desertified grassland/psammophytes/apparent traits/water allocation/adaptation strategy分类
农业科技引用本文复制引用
李莹,曾晓琳,游明鸿,刘金平,蔡捡..5种川西北沙化地草本植物生态适应策略的差异性[J].草业科学,2016,33(5):843-850,8.基金项目
四川省科技支撑计划(2011NZ0064) （2011NZ0064）
