知识与财富的链接
对东祁连山高寒草甸区不同休牧模式下植物群落特征和地下根系生物量进行比较研究,试验设传统夏季休牧(TG)、全生长季休牧(RG)和全年禁牧(NG)3个处理。结果表明:与TG处理相比,RG和NG处理增加了垂穗披碱草(Elymus nutans)和冷地早熟禾(Poa crymophila)的重要值、各功能群(禾本科、莎草科、豆科和杂类草)植物的高度、禾本科植物密度和生物量以及总地上、地下生物量,其中以NG处理区效果最为明显;同时RG和NG处理降低了杂类草植物的重要值、地下与地上生物量的比值以及杂类草的生物量和密度;在3种休牧模式中,Shannon-Wiener指数(H)、Pielou均匀度指数(J)和丰富度指数(S)及群落总密度的排列顺序均为:NGTGRG。研究表明,短期禁牧和全生长季休牧是提升青藏高原高寒草甸草原生产力与生态恢复的重要措施之一。
Effects of different grazing rest modes on plant community characteristics and underground biomass of alpine meadow-steppe were investigated in Eastern Qilian Mountains.The three grazing treatments were traditional grazing (TG),grazing rest in growing stage (RG) and non-grazing (NG).The results indicated that the height of gramineous,leguminous,sedge and forbs plant functional groups increased,aboveground and belowground biomass of gramineous plants,and the dominant gramineous plant important values of Elymus nutans were all increased with grazing ceasing of RG or NG,especially obvious with NG.However,the important values and the ratio in aboveground and underground community biomass of forbs were all decreased.The Shannon-Wiener index (H),Pielou evenness index (J),richness index (S) and total density of plant community are in an order of NG
