围栏封育对绥化地区羊草草地生物量的影响

选择绥化地区现存羊草草地为研究对象,比较围栏内外枯落物生物量、地上总生物量的动态变化。结果表明,枯落物生物量在围栏内外均呈现高—低—高的季节动态变化,且围栏内枯落物生物量积累明显大于围栏外。围栏内地上总生物量包括禾草类、杂类草和豆类草生物量均大于围栏外各组分生物量,且地上总生物量包括禾草类、杂类草和豆类草生物量在围栏内外均呈现明显单峰型增长曲线,这与该地区雨热同季的气象规律吻合,表现在围栏内外,地上总生物量的月增长率与月均气温和降雨量呈显著正相关关系,其他相关关系微弱等特点。

Effect of enclosure on Leymus chinensis steppes biomass in Suihua area

The Leymus chinensis steppe of abandoned field as the object,and research in the content of litter and overground biomass,comparing with in and out of the fence.The result was as follows: the content of litter,total overground biomass and grasses within the fence was higher than out while overground biomass of forbs and legume out of the fence was higher than within.The seasonal dynamic tendencies of litter within and out are both high-low-high.The seasonal dynamic growth curves of total overground,grasses and sedges,forbs and legume are all of similar form,which is single apex.The form of underground biomass is a typical reversed pyramid,spatial distribution descending from surface to subterranean.In this region rainfall comes together with the high temperature,and growth curve of monthly mean temperature and monthly mean rainfall is a single apex,which anastomose the discipline of plant.The seasonal dynamic of aboveground biomass out of fence had a very significant correlation with monthly mean temperature and monthly mean rain fall.At the same time,there was a closely correlation among the increasing rate of aboveground biomass out of fence and monthly mean temperature and monthly mean rain fall.The increasing rate of aboveground biomass within fence has a strong correlation with monthly mean temperature,but was weak in others.