三江平原小叶章湿地种群生物量结构动态与生长速率分析

对三江平原典型草甸小叶章和沼泽化草甸小叶章的生物量结构动态及生长速率进行了研究。结果表明,2种小叶章地上及各器官生物量均呈单峰型变化且峰值出现的时间相差15 d左右,地上及各器官生物量均表现为典型草甸小叶章>沼泽化草甸小叶章,但地下生物量则表现为典型草甸小叶章<沼泽化草甸小叶章;二者地上生物量的组成结构不尽相同,各器官对地上生物量的平均贡献率存在明显差异;2种小叶章地下生物量均具有明显的垂直结构和季节动态,但差异很大;二者各器官生物量生长速率的变化基本一致,但不同阶段生长速率值的大小存在明显差异;模拟结果表明,二者地上及各器官生物量均符合抛物线模型(y=b0 b1t b2t2),地下生物量和总生物量符合“S”型曲线y=b0/(1 b1e-kt)],其R2大多在0.920以上。

Study on biomass structure dynamics and growth rate of Calamagrostis angustifolia wetland in Sanjiang Plain

The biomass structure dynamics and growth rate of the typical meadow C.angustifolia and marsh meadow C.angustifolia were studied in Sanjiang Plain.The results showed that their aboveground and its each part biomass all presented the character of single peak changing,and the present time of maximum values had about 15 days gap.Their aboveground and its each part biomass all presented typical meadow C.angustifolia>marsh meadow C.angustifoli,while the underground biomass was just inverse to it;Their composing structure of aboveground biomass were different,and the percentages of each part biomass in aboveground biomass were also different;Their underground biomass all had distinct vertical structures and seasonal dynamics,but they had distinct difference;The changes of their growth rate of each part biomass were consistent in essence,but the values in different phases were distinctly different;The results of simulation showed that,their aboveground and its each part biomass all can be described by parabola model(y=b_0 b_1t b_2t~2),and the underground biomass and total biomass can be described by "S" curvey=b_0/(1 b_1e~(-kt))],their R~2 were almost over 0.92.