摘要
对森林草原火烧后群落建群种(优势种)、植物生活型、水分生态类型、牧草经济类群和产量变化动态的研究结果表明,在大兴安岭中段的森林草原地带,群落建群种贝加尔针茅、大针茅于火烧当年其盖度明显提高,但第二年有所下降,羊草盖度提高,日阴管盖皮下降;一年生杂类草较火烧前减少20％;旱生、广旱生植物增加一倍以上,中生,旱中生植物减少,禾本科增加12％,杂类草减少40％,莎草科也稍有减少;干草产量当年下降,在第二年出现最低值。出现上述结果是火烧促使生境条件旱化造成的,并与主要气候因子降水量有密切的关系。
The study of community constructive species (dominant), plant living form, water ecotype. pasturage economic groups and the changing trend of output on the forest steppe, which had been fired, showed that in the forest steppe of Great Xingan Mountains Middle Section. the cover degree of Stipa baicalensisand S.grandis, which are the constructive species, increased obviously at the first year, In the second year however, the cover degree of these grasses and carex pediformisdecreased, Annual weeds decreased by 20% also; but the cover degree of Aneurolepidium chinense increased, and the xeris and euryxeris plants increased by one time compared with that of pre—fired forest steppe; on the other hand, mesad and xeric-mesad plants decreased; Gramineaeincreased by 12%. Nevertheless, weeds decreased by 40%, Cyperaceaealso decreased slightly. The hay output declined at the first year and got its lowest value at the second year. These results were caused by the fire which brought about desiccation of habitat, and this is also connected closely with the main climatic factor of precipitaiton.
出处
《草业科学》
CAS
CSCD
北大核心
1990年第5期53-58,共6页
Pratacultural Science
