Plant Functional Traits of Terperate Shrubs in Inner Mongolia
【Author in Chinese】 张芯毓；
【Author's Information】 内蒙古大学， 生态学， 2018， 硕士
【Abstract in Chinese】 植物功能性状是植物在漫长的演化过程中对环境变化产生的适应策略及内部不同功能之间权衡策略的体现。研究植物功能性状,有助于确定植物控制功能性状的内在机制以及性状间的比例(scaling)关系,进而可以依据植物功能性状的改变来预测生态系统功能或过程的变化。本文基于对内蒙古自治区155个地点、67种灌木(包括3种半灌木)的野外调查及室内测量,分析了植物高度(H)、丛幅(WCC)、叶面积(LA)、叶厚度(LT)、茎组织密度(STD)、叶干物质含量(LDMC)、比叶面积(SLA)、叶碳含量(LC)、叶氮含量(LN)和叶片碳氮比(C:N)10种功能性状的相互关联、在不同生境间的差异以及对环境因子的响应,同时还重点探讨了广布类型灌木虎榛子和锦鸡儿属功能性状的特征及功能性状对环境因子的响应,主要研究结果如下:1.10种植物功能性状的种内变异小于种间变异,其中LC无论在种间水平还是种内水平,变异程度都非常小,是植物较为稳定的性状。2.山地灌木的H、LA、SLA、C:N显著高于草地灌木和荒漠灌木,草地灌木的WCC、LN显著高于荒漠灌木和山地灌木,荒漠灌木的STD、LT显著高于草地灌木和山地灌木,而LDMC、SLA、LN显著低于草地灌木和山地灌木。3.有5对性状的相关关系在整体水平上、不同生境的灌木中存在一致性,即H与WCC呈显著正相关,与STD显著负相关;C:N与LDMC呈显著正相关,与LN呈显著负相关;LT与SLA呈显著负相关。4.环境与植物种间差异共同影响植物功能性状的变异,在去除种间差异对性状的影响后,环境是导致部分性状变异的最主要原因。5.植物的H、STD、SLA、LC与年平均降水量(MAP)的关系在大尺度上、不同生境中、同属植物和同种植物中具有一致性,即MAP与植物H、SLA、LC呈显著正相关关系,与STD呈显著负相关关系。以上结果反映了干旱、半干旱的内蒙古地区,灌木的叶、茎等功能植物功能性状受环境因子(尤其是气候因子)的强烈影响,而植物种间性状存在的明显差异,同时潜在影响着植物功能性状与环境因子之间的关系。此外,植物种间的巨大差异也反映出系统发育对植物功能性状的变异有着重要的影响作用。
【Abstract】 Plant functional traits are the adaptation strategies of plants to environmental changes in the long evolution process and the representation of trade-off between different internal functions.The study of functional traits for various plant species and their response to environmental factors is helpful to understand the plant strategies and predict the consequence of climate change on ecosystem functions.Many studies have examined the variability of traits for various plant species and find both environment and phylogenetic exert strong impacts on plant traits.However,previous studies commonly concern on herbs,trees or the combination of multiple lifestyles(i.e.,trees,herbs and shrubs),shrub plants have seldom been reported in previous studies.Shrub species widely distributed across desert,grassland and mountain areas along the aridity gradients in Inner Mongolia,providing the opportunity to examine the variability corresponds to the variations in environmental factors.We conducted a field investigation at 155 sites dominated by shrub plants in Inner Mongolia.Totally 67 dominant shrub species were sampled and 10 functional traits were measured,including plant height(H),width of clump crown(WCC),leaf area(LA),leaf thickness(LT),stem tissue density(STD),leaf dry matter content(LDMC),specific leaf area(SLA),leaf carbon content(LC),leaf nitrogen content(LN)and leaf carbon to nitrogen ratio(C:N).We compared the difference for these functional traits for species distributed in desert,grassland and open mountain areas.Further,we analyzed the trade-off relationships between functional traits,and(1)the species levels,where the functional traits of species sampled at different sites along environmental gradients;(2)the intra-specific level,where the variability of plant traits in response to environmental factors is tested within a single species(i.e.,Ostryopsis davidiana);and(3)the genus level,where the variability of plant traits in response to environmental factors is tested within a genus(Caragana).The results showed that most plant functional traits measured here varied considerably among species,with the exception of leaf carbon content having minimal variations at inter-species and intra-specific levels.The values of H,LA,SLA and C:N for mountain shrubs were generally higher than those of shrubs in desert and grassland areas,while WCC and LN for grassland shrubs were significantly higher than that of shrubs grow in desert and mountain regions.Moreover,the shrubs in arid deserts commonly form the large woody density and leaf thickness but low LDMC,SLA and LN in fitting to the arid environment.We found the widespread trade-off relationships between plant traits either for data pooled for all species or the data for species in different ecosystems.The phylogenetic and environmental factors have strong effects on plant traits,especially for plant height and leaf traits.Furthermore,the variability of traits within a species or within a genus reflects the capacity of a species in response to environmental factors.In this study,the suit of traits of for Ostryopsis davidiana and Caragana spp.remain responded significantly to variations in environment factors.The above-mentioned results reflect that the traits of leaves and stems for shrubs respond strongly to environment factors,especially to climate factors.Under different environments,shrubs develop a suit of varied traits.Moreover,the phylogenetic effects also play an important role in the functional traits of these plants.
- 【Contributor】 内蒙古大学 【Year of Internet Publish】201812
- 【CLC code】Q948