巴尔鲁克山地混播人工草地群落生物量动态变化研究

摘要

对建植2～4年旱作混播人工草地地上生物量、各类群所占比例、地下生物量动态进行了研究分析,结果表明,随建植年限的延长,人工草地上生物量动态总体呈＂慢（初期）-快（中期）-慢（后期）＂的＂S＂型变化模式,地上生物量逐年增加;草地群落中,禾本科草替代豆科草的速率逐渐加快;垂直分布上,0～30cm地下生物总量逐年增加。地上、地下生物量积累在时空分配上趋于合理化,对资源的竞争趋于平稳,有助于草地建植4年内生产和生态上的稳定性。%The dynamic of aboveground biomass,the percentage of plant community and the underground biomasses of mix-sowed artificial grassland,which had been constructed in 2-4 years,were tested.The results showed that overall dynamic trend of the aboveground biomass was in ＂S＂ curve type,which is demonstrate in 3 varied stages：＂slow（beginning stage）-fast（middle stage）-slow（later stage）＂,and it increased with time.Leguminosae and Gramineae forages still took the dominated position,and the speed of Gramineae replaced the speed of Leguminosae among years in grassland community.The 0~30 cm underground biomass increased yearly.The accumulating of aboveground and underground biomass inclined to rationalization in the space distribution,and the competition for resources inclined to be steady,which was in favor of temporary steady ecological situation and production within 4 years.