Geographical Variants of the Siberian Alpine Vegetation for the ＂Circum-Boreal Vegetation Map＂

The vegetation cover in highlands is rather peculiar and complicated in its structure. The experience gained in mapping of alpine vegetation shows that the schematic small-scale maps reflect only the very common features. In boreal forest mountains of Siberia there are four systems of alpine vegetation including alpine-meadow, goltsy-tundra, island near the Pacific Ocean and tundra-steppe ones. Every system is represented by several geographical variants, characterized by regional phytogeographical peculiar features of this vegetation. The geographical variant includes a number of altitudinal belts （zones）, each of them has its floristic peculiarities and complexes of plant formations （for instance, Altai-Sayan variant composes of subalpine-alpine-subnival-nival belts）. Such geographical variants of alpine vegetation may be indicated as chorological units on a new Circum-Boreal Vegetation Map. Under discussion is the possible use of ecological-geographical approach to reflect the alpine vegetation as chorological （structural） units of the vegetation cover being exemplified by high mountains of the Siberia. This map may be more informative in terms of regional peculiarities in alpine vegetation within the boreal biome.

高寒地区锌肥对垂穗披碱草影响研究

为探寻锌肥在高寒草地对垂穗披碱草产量及品质的影响。试验试剂为ZnSO_4·7H_2O,Zn含量21%,试验牧草为垂穗披碱草(Elymus nutans Griseb),喷施浓度分别为500、600、700、800、900、1000和0 mg/kg(CK) 7个梯度锌溶液,通过对比物候期、生长速度、饲草产量、营养成分、种子产量和越冬率来筛选出适宜喷施锌溶液浓度。结果表明,在喷施800 mg/kg锌溶液浓度时,能较好的促进高寒地区垂穗披碱草的产量及品质。