北华大学学报(自然科学版)
北華大學學報(自然科學版)
북화대학학보(자연과학판)
JOURNAL OF BEIHUA UNIVERSITY(NATURAL SCIENCE)
2014年
6期
804-807
,共4页
李良%孙悦%夏富才%王戈戎%张英莉
李良%孫悅%夏富纔%王戈戎%張英莉
리량%손열%하부재%왕과융%장영리
美汉草%生物量分配%季节动态
美漢草%生物量分配%季節動態
미한초%생물량분배%계절동태
Meehania fargesii Levl%biomass allocation%seasonal dynamic
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。
調查闊葉紅鬆林林下早春開花植物美漢草( Meehania fargesii Levl)各箇器官生物量分配變化情況。結果錶明:在整箇生長季節中,美漢草各器官生物量總體上呈現先增加後減少的趨勢,5月初~7月初,根生長速率先快後慢,莖葉生長速率先慢後快,7月中旬以後各器官生物量逐漸減少;美漢草有性生殖的生殖分配佔總生物量的比例較小(4%~6%);根冠比在5~6月不斷上升,6~7月迅速下降,7月以後保持穩定;根和莖葉生物量分彆與總生物量呈顯著的線性正相關關繫。分析顯示:為瞭適應闊葉紅鬆林林下的光照變化,在林分鬱閉前,能量主要分配給地下部分;林分鬱閉後,莖葉生長佔主導。美漢草主要以營養繁殖為主,第2年的地下根狀莖來自第1年地上莖的繁殖方式及生物量分配策略,可能是美漢草成為林下優勢草本的重要原因。
조사활협홍송림림하조춘개화식물미한초( Meehania fargesii Levl)각개기관생물량분배변화정황。결과표명:재정개생장계절중,미한초각기관생물량총체상정현선증가후감소적추세,5월초~7월초,근생장속솔선쾌후만,경협생장속솔선만후쾌,7월중순이후각기관생물량축점감소;미한초유성생식적생식분배점총생물량적비례교소(4%~6%);근관비재5~6월불단상승,6~7월신속하강,7월이후보지은정;근화경협생물량분별여총생물량정현저적선성정상관관계。분석현시:위료괄응활협홍송림림하적광조변화,재림분욱폐전,능량주요분배급지하부분;림분욱폐후,경협생장점주도。미한초주요이영양번식위주,제2년적지하근상경래자제1년지상경적번식방식급생물량분배책략,가능시미한초성위림하우세초본적중요원인。
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.