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Productivity in grasslands of the U.S.S.R


, : Productivity in grasslands of the U.S.S.R. Developments in agricultural and managed forest ecology4(24): 374-380

Productivity is characterized by three indices: the standing crop of the green phytomass, G, the standing crop of living roots, R, and the net primary production, NPP, which is the sum of above-ground, ANP, and below-ground, BNP, production. The mean value of Gmax (maximal standing crop during the season) increases from desert steppes to meadows and decreases again in wet meadows and grassy bogs. The mean value of R rises from desert steppes to true steppes, reduces in dry meadows and increases again in wet meadows and grassy bogs. Hence, the change in the standing crops of G and R under the influence of moisture is not linear. Maximal standing crop of G is observed in meadows while maximal standing crop of R is a characteristic feature of true steppes, wet meadows and grassy bogs. With increases in the degree of moistening in grasslands, the NPP value rises from 1000 to 4400 g.m2.yr-1, the BNP value increases from 690 to 3800 g.m2.yr-1. The relationship between NPP and the degree of moistening is practically linear.

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