PHYTOMASS STOCK AND NET PRIMARY PRODUCTION IN THE STEPPE ECOSYSTEMS OF SIBERIA AND KAZAKHSTAN
https://doi.org/10.7868/S0373244417040041
Abstract
The article reviews data on different phytomass fractions and aboveground (ANP) and belowground (BNP) net primary production in steppe ecosystems between LE65° and 117° and NL 50° and 56°. The data were obtained by different researchers, employing the same methods. The differences between steppes in the aboveground layer were quite distinct: the average maximum green phytomass content varied from 70 g/m2 (deserted steppe) to 310 g/m2 (meadow steppe). Green phytomass decreased eastward. The average values of ANP were in the range from 160 to 540 g/m2 per year. In contrast to the aboveground phytomass, living and dead belowground plant parts and belowground production was found to be close to the ones in other steppe ecosystems, i.e. meadow, true and dry steppes. The living aboveground phytomass was shown to vary between 800–1400 g/m2 , while belowground production ranged 1060–2300 g/m2 per year. Thus the drier the steppes, the greater the phytomass portion concentrates in soils. Before winter steppe ecosystems store and save significant amount (nearly 1000 g/m2 ) of living belowground plants organs. Due to living roots, rhizomes, tillering nodes that remain in soil, plants survive over the periods unfavorable for green phytomass development, such as frosts, droughts and heavy grazing pressure. The belowground layer safe keeps the biodiversity in steppes.
About the Authors
A. A. Titlyanova
Institute of Soil Science and Agrochemistry, Siberian Branch, Russian Academy of Sciences
Russian Federation
Novosibirsk
Russian Federation
Novosibirsk
S. V. Shibareva
Institute of Soil Science and Agrochemistry, Siberian Branch, Russian Academy of Sciences
Russian Federation
Novosibirsk
Russian Federation
Novosibirsk
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Review
For citations:
Titlyanova A.A., Shibareva S.V. PHYTOMASS STOCK AND NET PRIMARY PRODUCTION IN THE STEPPE ECOSYSTEMS OF SIBERIA AND KAZAKHSTAN. Izvestiya Rossiiskoi Akademii Nauk. Seriya Geograficheskaya. 2017;(4):43-55. (In Russ.) https://doi.org/10.7868/S0373244417040041
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