Spatiotemporal variability of the chornozem soils humus

An assessment of the spatio-temporal variability humus content in soil is presented, and atendency its decreasing agro-climatic regions Luhansk region established. The cartogramsof spatial distribution tendencies changing soils theLuhansk for 20 years have been obtained. A very high (from 4 to 6.5 %) isobserved northern, central, and, partially, southern eastern parts first agroclimaticregion, where mainly thick ordinary medium-humus chornozems are located loess rocks. In therest territory, varies from 2 %. most territory secondagroclimatic region, except strip, which stretches northwest southeast, thehumus 3–4%, interspersed with those areas (up 4–6 content.The covers third agroclimatic characterized by a great variety types. ofthe there crushed chernozems on eluvium dense bedrocks predominanthumus 2.5–4 %, here, narrow strip (along Anthracite – Sverdlovske line), arepowerful rocks up small partof them also south region. part district (to east Lutugino –Krasnodon medium-thick low-power lowhumuschernozems, 2–3.5 Over surveys between 1987–1991 2007–2011 against background sufficiently compared theother Steppe zone Ukraine, decrease agroclimaticregion was 0.49 % absolute terms (89.62 results survey), second 0.29 (92.45 relative values), 0.1 (97.48 relativevalues). variation smallest (thecoefficient 15.37 %), cover more uniform, it somewhat larger secondand (the coefficient 20.0 20.67 variegated.The number fields (cases) decreased, an average content,on contrary, increased.