美汉草(Meehania fargesii Levl)生物量分配分析  

Analysis of Biomass Allocation of Meehania fargesii

作　　者：李良[1] 孙悦[1] 夏富才[1] 王戈戎[1] 张英莉[1] 

机构地区：[1]北华大学林学院,吉林吉林132013

出　　处：《北华大学学报（自然科学版）》2014年第6期804-807,共4页Journal of Beihua University（Natural Science）

基　　金：国家"十二五"科技支撑项目(2012BAC01B03-1)

摘　　要：调查阔叶红松林林下早春开花植物美汉草（ Meehania fargesii Levl）各个器官生物量分配变化情况。结果表明：在整个生长季节中,美汉草各器官生物量总体上呈现先增加后减少的趋势,5月初~7月初,根生长速率先快后慢,茎叶生长速率先慢后快,7月中旬以后各器官生物量逐渐减少；美汉草有性生殖的生殖分配占总生物量的比例较小（4%~6%）；根冠比在5~6月不断上升,6~7月迅速下降,7月以后保持稳定；根和茎叶生物量分别与总生物量呈显著的线性正相关关系。分析显示：为了适应阔叶红松林林下的光照变化,在林分郁闭前,能量主要分配给地下部分；林分郁闭后,茎叶生长占主导。美汉草主要以营养繁殖为主,第2年的地下根状茎来自第1年地上茎的繁殖方式及生物量分配策略,可能是美汉草成为林下优势草本的重要原因。Meehania fargesii Levl blooms in early Spring in broad-leaved Korean pine forest. Its biomass allocation of various organs during the growing season was investigated. The result indicated that various organs of M. fargesii Levl biomassfirstly increased and then decreased during the growing season. From early May to early July,root growth rate firstly increased slowly and then decreased quickly, stem and leaf growth rate firstly decreased slowly and then increased quickly. Various organs biomass were declining after mid-July. M. fargesii Levl sexual reproductive allocation（4% ~6%） occupies small proportion in total biomass. M. fargesii Levl root-top ratio was growing from May to June,decreased rapidly from June to July and then remained stable after July. There were significant positive correlations between root biomass and stem and leaf biomass and total biomass, respectively. The above analysis shows：in order to adapt to illumination changes in broad-leaved Korean pine forest,the energy is allocated to the underground portion before tree-canopy closure, stem and leaf growth dominates after tree-canopy closure. The nutritional propagation is the main mode of M. fargesii Levl,the next year underground rhizomes are from the first year stems,reproductive modes and biomass allocation strategy made M. fargesii Levl be understory dominant herbaceous.

关 键 词：美汉草 生物量分配 季节动态 

分 类 号：S718.55[农业科学—林学]