苘麻形态特征结构对出苗时间的响应动态  

Dynamic architectural responses of morphological traits to emergence timing in Abutilon theophrasti(Malvaceae)

作　　者：Shu Wang Dao-Wei Zhou 

机构地区：[1]College of Forestry and Forest Ecology Research Center,Guizhou University,Guiyang 550025,China [2]Northeast Institute of Geography and Agroecology,Chinese Academy of Sciences,Changchun 130102,China

出　　处：《Journal of Plant Ecology》2023年第3期66-79,共14页植物生态学报（英文版）

基　　金：funded by the National Natural Science Foundation of China(NSFC,32171511)to S.W.

摘　　要：结构可塑性有利于理解植物应对出苗时间变异中的形态和生物量分配可塑性以及相关联的生长策略。为研究植物如何通过动态的结构可塑性对出苗时间做出响应,本研究设置野外试验,在不同的日期种植苘麻(Abutilon theophrasti),使它们在春季、晚春、夏季和晚夏出苗,作为4个出苗时间处理(ET1-ET4)。在3个生长阶段测量植物在不同垂直构层(每层间距10或20 cm)中的生物量和形态特征。结果表明,在春季与夏季之间出苗的植物和晚夏出苗的植物在繁殖阶段分别表现出“垂直拱形”和“倒锥形”两种形状,揭示了它们对营养和繁殖生长的时间安排有鲜明反差。出苗更早的植物有相对分离的营养和繁殖阶段,晚夏出苗的植物由于寿命缩短,同时加速叶片和繁殖生长,营养和繁殖阶段相互重叠。尽管如此,更早出苗的植物仍有能力采取不同的优化策略应对它们相应的处境。结构分析应该是能更好地理解在变化的环境条件背景中植物的多样化策略的有效途径。Architectural plasticity in traits should be useful for understanding morphological and allocation plasticity at the whole-plant level and associated growth strategies of plants in dealing with variation in emergence time.To investigate how plants respond to emergence timing via dynamic architectural plasticity,we conducted a field experiment by sowing plants of Abutilon theophrasti on different dates to make them emerge in spring,late spring,summer and late summer,as four treatments of emergence time(ET1-ET4),and measured a series of mass and morphological traits in different vertical layers(with an inter-distance of 10 or 20 cm per layer)of plants at three stages.The‘vertical arch'and‘inverted-cone'shapes displayed at reproductive stage by plants emerged between spring and summer(ET1-ET3)and in late summer(ET4),respectively,revealed that they had contrasting timing schemes for vegetative and reproductive growth.Plants emerged earlier had relatively isolated vegetative and reproductive stages,while late-summer emerged plants had overlapped vegetative and reproductive stages due to accelerated leaf and reproductive growth simultaneously,as a result of shortened lifetime.In spite of this,plants emerged earlier were still able to adopt different optimal strategies in dealing with their corresponding circumstances.Architectural analysis should be a useful approach to better understanding diverse plant strategies in the context of varying environmental conditions.

关 键 词：生物量分配 出苗推迟 植物结构 繁殖生长 营养生长 垂直分层 

分 类 号：Q94[生物学—植物学]