单 位：
东北师范大学草地研究所/植被生态教育部重点实验室
关键词：
五脉山黧豆;地上生物量;松嫩草地;季节动态;再生量;垂直分布
摘 要：
对松嫩草地羊草+五脉山黧豆群落地上生物量季节动态的研究表明:五脉山黧豆种群和羊草+五脉山黧豆群落地上生物量8月上旬达到最大值,季节动态呈单峰型,极好地符合Logistic生物学增长曲线;绝对增长速率在返青后半个月出现最大值,之后波动变化,8月下旬出现负值;相对增长速率随时间逐渐变小,也在8月下旬出现负值。群落地上生物量的垂直分布集中在7.5~42.5cm层,占总生物量的83%,7.5cm以下所占的比例小。群落第一次取样后的再生量最大,为(135.13±39.55)g/m2。再生量随着时间推移呈指数形式下降。群落的生产力在8月份上旬达到最大值,为339.37g/m2。
译 名：
Study on Seasonal Dynamics of Aboveground Biomass of Leymus chinensis+Lathyrus quinquenervius Community on Songnen Grassland
作 者：
SONG Yan-tao,ZHOU Dao-wei,YU Yang(Institute of Grassland Science,Northeast Normal University,Key Laboratory of Vegetation Ecology,Ministry of Education,Changchun 130024,China)
关键词：
Lathyrus quinquenervius;Aboveground biomass;Songnen grassland;Seasonal dynamics;Regrowth;Vertical distribution
摘 要：
Study on seasonal dynamics of aboveground biomass of Leymus chinensis+Lathyrus quinquenervius community on Songnen grassland showed that: the aboveground biomass of L.quinquenervius population and L.chinensis+L.quinquenervius community reached the peak on first ten days of August,the seasonal dynamics was accord with Logistic curve and monopeaks appeared.The maximal value of the absolute growing rate(AGR) appeared after the about twelve days of the community returning green,then fluctuated,and negative value appeared on last ten days of August.The relative growing rate(RGR) waned gradually and negative value also appeared on the last ten days of August.The layer in 7.5 to 42.5cm occupied 83% of the aboveground biomass,the proportion was small below 7.5 cm.The maximal regrowth biomass appeared after the first time sampling,which was 135.13±39.55g·m-2,and it descended in the form of exponential.The productivity of the community reached the peak on first ten days of August,which was 339.37g/m2.
