检索规则说明:AND代表“并且”;OR代表“或者”;NOT代表“不包含”;(注意必须大写,运算符两边需空一格)
检 索 范 例 :范例一: (K=图书馆学 OR K=情报学) AND A=范并思 范例二:J=计算机应用与软件 AND (U=C++ OR U=Basic) NOT M=Visual
作 者:古琛[1] 杜宇凡 乌力吉[1] 陈万杰[1] 薛文杰[1] 赵萌莉[1]
机构地区:[1]内蒙古农业大学生态环境学院,内蒙古呼和浩特010019
出 处:《生态环境学报》2015年第12期1962-1968,共7页Ecology and Environmental Sciences
基 金:国家自然科学基金项目(31460110);内蒙古农业大学草业与草地资源重点实验室
摘 要:以内蒙古短花针茅(Stipa breviflora)草原为研究对象,设置4 个载畜率水平的随机区组实验,根据生活型和不同光合途径划分植物功能群,探讨载畜率对群落地上地下生物量和不同功能群生物量的影响.结果表明:群落地上生物量随载畜率的增大而显著降低(P〈0.05),且二者呈负相关关系,回归方程Y=281.54-53.47X;地下生物量呈“T”字型分布,约80%生物量集中分布在0-20 cm 土层中,载畜率对地下生物量及分布无显著影响(P〉0.05);群落根冠比在7-12 之间,随载畜率的增大而显著增大(P〈0.05).载畜率对C4 植物地上生物量无显著影响(P〉0.05),但其相对生物量随载畜率的增大而增大,C3 植物地上生物量与相对生物量均随载畜率的增大而降低(P〈0.05).多年生丛生禾草地上生物量相对稳定,受载畜率的影响差异不显著(P〉0.05);其相对生物量在群落中最高,且均随载畜率的增大而增大(P〈0.05);灌木、半灌木和小半灌木的地上生物量随载畜率的增大而减小(P〈0.05),但其相对生物量除重度放牧显著最低(P〈0.05)外,其他处理之间无显著差异(P〉0.05);多年生杂类草、多年生根茎禾草和一、二年生植物地上生物量与相对生物量均随载畜率的增大而显著降低(P〈0.05),多年生根茎禾草在轻度放牧下就几乎消失,而一、二年生植物在重度放牧下消失.Desert steppe of Stipa breviflora in Inner Mongolia was taken as the object, and randomized block experiment was set based on 4 stocking rates, as well as plant functional groups were divided according to different life forms and photosynthetic pathways to study the effects of different stocking rates on above-and-underground biomass of community and the biomass of different functional groups. The results indicated that with stocking rates raised, aboveground biomass of community was dropping(P<0.05), and they were negative correlated as well, the regression equation was Y=281.54-53.47 X. Belowground biomass distributed like 'T', and about 80 percent of it concentrated on 0~20 cm soil, meanwhile, it was not effected significantly by stocking rates(P>0.05). However, the root shoot ratio which between 7 and 12 was increasing with the stocking rates added. Aboveground biomass of C4 was also not influenced remarkably, whereas its relative biomass was upgrading and both of aboveground and relative biomass of C3 were reducing markedly by stocking rates increased(P<0.05). Aboveground biomass of perennial bunchgrass was not impacted(P>0.05) but its relative biomass, the highest one in community, was advancing with stocking rates ascended(P<0.05). On the contrary, the aboveground biomass of shrub, subshrub and semishrub was declining(P<0.05), whereas its relative biomass was stable except it was the lowest in heavy grazing(P>0.05). Both aboveground and relative biomass of perennial forbs, perennial rhizome grasses, annuals and biennials were decreasing respectively by stocking rates enlarged(P<0.05), and even perennial rhizome grasses practically disappeared under light grazing as well as annuals and biennials vanished under heavy grazing.
分 类 号:Q948[生物学—植物学] X171[环境科学与工程—环境科学]
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在链接到云南高校图书馆文献保障联盟下载...
云南高校图书馆联盟文献共享服务平台 版权所有©
您的IP:216.73.216.38