异质性水分环境中克隆整合对活血丹生物量分配及叶片结构特征的影响

喀斯特石漠化环境有着高度的生境异质性，异质性生境中土被不连续，土壤瘠薄，岩溶漏斗上的土壤保水性差，严重制约着喀斯特植被的生长及分布。为探究克隆植物在喀斯特地区的适应策略，本研究以喀斯特黄色石灰土为基质，选用克隆植物活血丹（Glechoma longituba），以一个节间连接的两个分株为材料，保持节间连接或切断，种植于相邻花盆中，并施以不同浇水量，以明确不同水分可用性水平下克隆整合对活血丹生物量积累、生物量分配、叶片气孔及叶片组织特征的影响。结果显示，克隆整合显著促进活血丹生物量的积累及对根、叶的生物量分配；增加了活血丹叶气孔导度，降低了气孔指数；叶海绵组织受克隆整合影响较小，但栅栏组织及栅海比（栅栏组织/海绵组织）表现为非整合分株高于整合分株。本研究表明，克隆整合可增加活血丹胁迫分株对根、叶的投资，并以更佳的叶气孔、组织适应策略提高其在喀斯特生境中的生存与适应。

Effects of Clonal Integration on Biomass Allocation and Leaf Structure of Glechoma longituba(Nakai) Kupr in Different Water Availability

Because of discontinuous soil coverage, poor soil fertility and soil water scarcity, the high heterogeneity of karst habitats seriously restricts the growth and distribution of local plants. To clarify the adaptive strategies of clonal plants in karst area, two connected ramets with a single internode of Glechoma longituba were planted in yellow calcareous soil. Then, we cut off the half of the internode and made the ramets disconnected, supplied different amounts of water to clarify the effects of the clonal integration on biomass accumulation, distribution, stomata and tissue characteristics of leaves under different treatments. The results showed that clonal integration significantly promoted the biomass accumulation of G.longituba, and increased biomass allocation to roots and leaves. The stomatal conductance were increased and the stomatal index were decreased by clonal integration of leaves. There was less affected on leaves sponge tissue, but the palisade tissue and the ratio of palisade to spongy tissue showed that the non-clonal integration ramets were higher than the integrated ramets. The clonal integration could increase the investment of roots and leaves of G.longituba, and further promoted clonal plant survival and adaptation in karst habitats with better leaves stomata and tissue structure.