生态学报2018，Vol.38Issue(10)：3432-3440,9.DOI:10.5846/stxb201703200469
扎龙湿地不同生境芦苇种群根茎数量特征及动态
Quantitative characteristics and dynamics of the rhizome of Phragmites australis populations in heterogeneous habitats in the Zhalong Wetland
摘要
Abstract
A comparative study of the quantitative characteristics of the rhizome of Phragmites australis populations in four habitats in the Zhalong Wetland was performed by sampling a unit volume of soil and measuring biomass and rhizome length.The results showed that P.australis returned green around May 10 and began to enter the vegetative growth period.There was a slow increasing trend in rhizome length from June to August,but a significantly increasing trend was observed from August to October.Moreover,rhizome length in the late period was 3.5-10.3 times higher than that in the early period.The middle and late growth seasons were the main periods of new rhizome supplement and growth of the population,during which time the spatial expansion of the population was achieved and more breeding buds were reserved for nutritional reproduction.Rhizome biomass and dry matter storage decreased gradually from June to August,but increased gradually from August to October,with the largest biomass observed in October,the end of the growth season,and was significantly higher than in other months(P ＜ 0.05).The consumption of rhizome nutrients in the population mainly contributed to the germination of rhizome buds and the growth of young plants.The storage of rhizome nutrients also provided material support for the renewal and expansion of the population in the next year.The phenomenon of "super compensatory" storage in the rhizomes of the population was obvious.The length and biomass of rhizomes were the largest in the wet habitat,followed by the xeric,and aquatic habitats,however,they were the lowest in the saline-alkali habitat.The dry matter storage of rhizomes was the largest in the xeric habitat,followed by the wet and aquatic habitats,it was the lowest in the saline-alkali habitat.There was a significant,linear correlation between rhizome length of P.australis and the actual growth time after returning green.However,there was a significant,logarithmic correlation between rhizome biomass,dry matter storage,and the actual growth time after returning green,the goodness of fit of equation was 0.804-0.997,and the fitting equation reached a significant level of P＜0.01.The length,biomass,and dry matter storage of P.australis rhizomes in the four habitats showed relatively stable seasonal dynamics controlled by genetic factors during the growing period.The differences between the habitats and their differential orders were basically stable,showing significant environmental effects of soil factors,among which,the soil water content,organic matter,and available nitrogen were the positive drivers,while pH and available phosphorus were the negative drivers.The driving effects of soil water content and pH were the most prominent.关键词
扎龙湿地/芦苇种群/根茎/异质生境/数量特征Key words
Zhalong Wetland/Phragmites australis population/rhizome/heterogeneous habitats/quantitative characteristics引用本文复制引用
焦德志,姜秋旭,曹瑞,闫秋月,杨允菲..扎龙湿地不同生境芦苇种群根茎数量特征及动态[J].生态学报,2018,38(10):3432-3440,9.基金项目
国家自然科学基金项目(31472134,31672471) （31472134,31672471）
黑龙江省教育厅科学技术研究项目(12541887) （12541887）
