毛乌素沙地中国沙棘克隆生长对土壤水分含量的响应  

The response of clonal growth of Hippophae rhamniodes L.subsp sinensis to the availability of soil moisture in Mu Us sand land

作　　者：贺斌[1] 赵粉侠[1] 李根前[1,2] 马先锋[1] 徐德兵[3] 李甜江[2] 

机构地区：[1]西南林业大学林学院,云南昆明650224 [2]北京林业大学林学院,北京100083 [3]云南省林业科学研究院,云南昆明650204

出　　处：《南京林业大学学报（自然科学版）》2012年第4期46-50,共5页Journal of Nanjing Forestry University：Natural Sciences Edition

基　　金：国家自然科学基金项目(31070551);国际科技合作项目(2008DFA32270);西南林学院森林培育云南重点学科资助项目

摘　　要：通过生物量测定和跟踪挖掘法,研究了毛乌素沙地中国沙棘克隆种群生长特征和形态特征对土壤水分条件的可塑性反应。结果表明:低水分条件下,植株个体和种群都较小,子株数量、萌蘖根条数和分枝级数较少,而隔离区较长,种群趋向于游击型;高水分条件下,植株个体和种群都较大,子株数量、萌蘖根条数和分枝级数较多,而隔离区较短,种群趋向于集团型。在生物量分配方面,低水分条件下,枝条、叶片、根系和地上生物量分配比例较大;高水分条件下,树干、萌蘖根和地下生物量分配比例较大。土壤水分条件差异引起中国沙棘个体大小和种群大小的分化,进而导致了种群适合度的差异。Based on the biomass determination and track mining techniques, plasticity strategy of Hippophae rhamniodes L. subsp sinensis population at different soil moisture conditions was studied in the Mu Us sand land. The results showed ： under low level of soil moisture supply, plant individuals and population were smaller, the daughter ramets den- sity and branching intensity were smaller while spacer was longer, which caused population tend to guerrilla type ; under high level of soil moisture supply, plant individuals and population were bigger, the daughter ramets density and branching intensity were bigger while spacer was shorter, which caused population tend to phalanx type. In addition, the biomass al- location of branch, leave, root and aboveground were more under low level of soil moisture supply ; the biomass allocation of trunk, spacer and underground biomass were more under high level of soil moisture supply. Differences of soil moisture conditions caused the plant individuals and population differentiates and led to the differentiation in population fitness.

关 键 词：中国沙棘 克隆生长 表型可塑性 土壤水分 

分 类 号：S718[农业科学—林学]