干旱区生态环境知识资源中心

The author’s database of his own and published data on the biological productivity of zonal, mountainous, and intrazonal soil-and-vegetation associations is used to consider geographic patterns of the supply of phytomass, annual production, dead plant matter and its degradation rate, and the like, in northern Eurasia. The highest and lowest biological productivity values are established for each temperature belt, bioclimatic region, province, and zone. Two biohydrothermal boundaries are identified. The first passes along the boundary of the broadleaf forest zone; north of it, the zonal and intrazonal associations have similar annual production values, but south of it, with increasing heat supply, the associations that occur under the highest moisture levels (grass bogs and tugays) have the production values much greater than those of the zonal associations. The second boundary passes along the northern subboreal desert zone and expresses the relationship between living and dead plant material. Quantitative correlations between primary and secondary production are identified.