草业科学2017，Vol.34Issue(1)：9-15,7.DOI:10.11829/j.issn.1001-0629.2016-0151
封育和放牧对黄土高原典型草原芽库的影响
Effects of fencing and grazing management on bud bank in a semiarid steppe on the Loess Plateau
摘要
Abstract
In perennial grassland ecosystems,the bud bank plays an important role in vegetation maintenance and recruitment.In this study,we used field root-digging to examine the bud bank,analyze above-ground vegetation characteristics,and below-ground bud bank density,under fencing and grazing management measures.Results showed that the bud bank in a semiarid perennial steppe on the Loess Plateau was dominated by tiller buds,and bud bank density ranged from 832 to 6 848 bud?m-2.Short-term fencing significantly increased the bud bank density and the density of grass bud banks,and decreased the density of forb bud banks in relation to grazed grasslands (P<0.05).The change of tiller buds,rhizomatous buds and root sucker buds caused a change in total bud bank density under two management types.The density of tiller buds and rhizomatous buds was significantly higher and the density of root sucker buds was significantly lower in grasslands fenced for five years than in grazed grasslands (P<0.05).Grass bud bank density was significantly and positively correlated with above-ground biomass,but negatively correlated with above-ground shoot numbers (P<0.05).To a certain extent,the effects of grazing and fencing on aboveground vegetation in a semiarid steppe on the Loess Plateau are mediated through grass bud bank demography.The bud bank is an excellent predictor of the above-ground vegetation.We can predict grassland productivity and succession direction using bud bank determination.关键词
封育/芽库/典型草原/无性繁殖Key words
fencing/bud bank/semiarid steppe/asexual recruitment分类
农业科技引用本文复制引用
崔伟,赵凌平,赵芙蓉..封育和放牧对黄土高原典型草原芽库的影响[J].草业科学,2017,34(1):9-15,7.基金项目
国家自然科学青年基金项目(31302013) （31302013）
河南省教育厅科学技术研究重点项目(13A2302812013) （13A2302812013）
