CAJ | 학술논문

在云南西双版纳勐仑(600 m,低海拔)、菜阳河(1 100 m,中海拔)和勐宋(1 600 m,高海拔),对热带季节雨林4种主要树种绒毛番龙眼(Pometio tomentosa)、云南玉蕊(Barringtonia macrostachya)、云南肉豆蔻(Myristica yunnanensis)和小叶红光树(Knema globularia)幼苗进行移栽试验,测定幼苗的光合作用和生物量.结果表明,高海拔七的低温使幼苗处于休眠或光系统受到不可恢复的破坏,光合作用几乎停止;4种幼苗的最大净光合速率及生物量均随海拔的增加而下降;低、中海拔上4种幼苗的净光合速率日变化曲线均表现为"双峰型",低海拔的第一个峰明显高于中海拔.除小叶红光树外,其它幼苗的根生物量分数均随海拔增高而增加.海拔升高,温度降低是限制幼苗光合特性、生物量积累的主要因子,也是某些幼苗在更高海拔雨林群落中消失的潜在原因.此外,幼苗的根生物量分数随海拔上升而增加是其对极限环境温度的一种重要适应特征.
재운남서쌍판납맹륜(600 m,저해발)、채양하(1 100 m,중해발)화맹송(1 600 m,고해발),대열대계절우림4충주요수충융모번용안(Pometio tomentosa)、운남옥예(Barringtonia macrostachya)、운남육두구(Myristica yunnanensis)화소협홍광수(Knema globularia)유묘진행이재시험,측정유묘적광합작용화생물량.결과표명,고해발칠적저온사유묘처우휴면혹광계통수도불가회복적파배,광합작용궤호정지;4충유묘적최대정광합속솔급생물량균수해발적증가이하강;저、중해발상4충유묘적정광합속솔일변화곡선균표현위"쌍봉형",저해발적제일개봉명현고우중해발.제소협홍광수외,기타유묘적근생물량분수균수해발증고이증가.해발승고,온도강저시한제유묘광합특성、생물량적루적주요인자,야시모사유묘재경고해발우림군락중소실적잠재원인.차외,유묘적근생물량분수수해발상승이증가시기대겁한배경온도적일충중요괄응특정.
The seedlings of 4 dominant tree species of tropical seasonal rain forest,such as Pometia tomentosa,Barringtonia macroslachya,Myristica yunnanensis and Knema globularia,were transplantcd at three altitudinal sites (low 600 m in Menghn;middle 1 1 00 m in Caiyanghe;high 1 600 m in Mengsong)in Xishuangbanna.The parameters of photosynthesis and biomass of these seedlings were measured.The results showed that the low temperature at high altitude caused dormancy or photosynthetic system destroy.The maximum photosynthesis rate (P_(max))and dry biomass of four seedlings declined significantly along the increment of elevation.The diurnal change pattern of photosynthetic rate of four seedlings at low and middle altitude both showed double-peak type,which the first peak appeared at 11:00～12:00 am and the next peak at 4:00～5:00 pm,and the first peak was higher significantly at low altitude than that at middle altitude.Except for K.globularia,the root biomass fraction (RMF)of seedlings of the others increased with the increment of altitude.It is cocluded that the biomass and photosynthetic rate of these seedlings are mainly limited by temperature,which is the potential rcason that these species disappeared in rain forest Conmmunity at high altitude.Furthermore,It is an important characteristic adapted to limited environmental temperature that RMF of four seedlings increased with the increment of altitude.