Machine learning techniques open up new opportunities for research, analysis and can be obtained from forest inventory. Ensemble machine learning methods contain several alternative learning models for predicting characteristics and improving the analysis efficiency of processed data. One of the goals of inventory data analysis is to model heights for individual forest elements, which will allow to build the most accurate models of forest stands growth.
This work investigates the influence of vegetation succession processes on the soil changes of former arable lands. It was noted that on post-agricultural soils, accumulation of organic matter in the soil differs, depending on the state of the land plot. The analysis shows that influence of vegetation on the accumulation of organic matter in the former arable horizon has a distinctly linear nature. The dominant species are mesotrophic and mesophyte plants, requiring little more than soils with mineral nutrients and sufficient humidity. The amount of organic matter accumulated in the upper horizon of the soil is greater than that of the underlying horizon. The content of organic matter in the soil horizons of the studied area is characterized by a distinct decreasing pattern in the direction from the forest edge to the field edge. Overall, it can be noted that farther away from the forest edge, the soils change from moderately acidic to slightly acidic. At this stage, depending on the succession state of the post-agricultural soil plot, the amount of organic matter in it is determined either by the species forming the soil cover and (or), to a greater extent, by tree and shrub vegetation. The optimum of the organic matter accumulation shifts to the zone with a large share of tree species.
The article presents the study of the restoration processes of vegetation in stands of pine and spruce on lands formerly used for agricultural purposes. The standard methods used in phytocenological and pedologic studies are used. It is noted that a high content of organic matter can not be a limiting factor in the growth and development of living soil cover and does not affect its projective cover. Depending on the care of stands by applying fertilizers and using herbicides, the species composition of forest live cover varies while the dominant species are preserved. The number of woody species is considerably large in pure pine cultures in comparison with those of experimental sites, where fertilizers and herbicides were applied and understory is completely absent. It should be noted that more intensive recovery is observed in pine stands treated with herbicides. In cultures of old-age pine and spruce, the natural recovery of spruce is constrained by the vegetation of understories and the canopy of forest stand. After the formation of the closed canopy of forest stand, forest site factor and heterogeneity of the soil cover are mitigated by low light under the canopy. Thus, forest live cover becomes more uniform.
A study was carried out at the plantations of the genus Populus in the Leningrad Region, formed on lands previously used in agriculture, on soils underlain by carbonate rocks. It is noted that in the studied stands, stem phytomass is produced, exceeding the natural aspen forests in the studied area. Minor damage by stem rot is noted only in the fragrant poplar forest. An increase in the initial density of forests increases the density of poplar wood, but reduces the total stock of the stand and stem phytomass. The conducted studies have shown the promise of growingFirst sections in your paper.
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