Concentration and reserves of nitrogen in soils and plant matter in blocks of grass ecosystems of the North‐Western Precaspian region, Russia

Aim . Determination of phytocenosis productivity, nitrogen concentration and reserves in blocks plant associations by soil types the North‐Western Precaspian region Russia. Methods. Comprehensive research on accumulation organic matter five matter, six three season using well‐known methods accounting analysis soils plants. Results. The regularities phytomass formation, changes main for 2011–2018 seasons were revealed. Conclusions. Ephemeroid‐wormwood‐cereal, ephemeroid‐wormwood, cereal‐wormwood, forb‐campfire mixed‐grass‐campfire communities formed light chestnut are most productive, with a total productivity 24.34 t/ha. maximum was observed wormwood‐saltwort, forb‐saltwort cereal‐saltwort – 1.9, 1.97, 2.2, 2.57%, respectively, which is due to predominance Artemisia taurica Willd ., lercheana Web.ex Stechm. Salsola iberica Sennen&Pau. In where there representatives Poaceae, Brassicaceae Caryophyllaceae , decreases 1.72–1.74%. Its value higher light‐chestnut soil, being 1.82% absolutely dry mass, while meadow‐chestnut it decreased 1.75 saline typically 1.38%. root mass associations, its indicators 3.2 times less than above ground mass. Nitrogen following decreasing series: roots ≥ green rags felt. input part balance 171.6 accumulates 63.1 49.1 kg/ha automorphic typical 171.9; 64.3 58.1 expenditure part, respectively. first type minimum deficit 0.6 kg/ha, 1.2 9