斧头湖挺水植被的群落学研究 Ⅲ.菰群落(Com. Zizania Iatifolia)的生物量动态及生产量测定

A PHYTOCOENOLOGICAL STUDY ON THE EMERGENT VEGETATION IN FUTOU LAKE Ⅲ.THE BIOMASS AND PRIMARY PRODUCTION OF COM.ZIZANIA LATIFOLIA

用收割法对湖北省武昌县斧头湖菰群落地上部分生物量的变化进行了研究,并测定了该群落的生产量。菰群落的抽条密度在3月下旬达到最大值97.8±13.5根/m^2,现存量在9月份达到最大值1520.88±346.32g/m^2。利用生产结构图对菰群落3—6月份的枯死叶量进行了估计,并主要利用Mason等(1975)的方法对菰群落的枯死凋落量进行了估算,由此得到菰群落的生产量为1792.02g/m^2,比最大现存量高出17.8%,P/B=1.24。菰群落的种子生产量很低,约为14.56g/m^2。

The biomass changes of Com.Zizania latifolia was studied using the harvest method,and its primary production was estimated.The peak shoot density of the community,occuring in March 23 1990, was 97.8/m^2.The peak standing crop 1520.88 g/m^2 was achieved in September.The cumulative weights of the dead leaves during March and June was reckoned using the productive structure graphs,and according to the method of Mason and Bryant(1975),the production of the community was estimated as 1792.02g/m^2,17.8% higher than its peak standing crop,and P/B=1.24.The seed production of the community was very low,only about 14.46g/m^2.