Influence of solar energy and tree-crown closure on the species richness of grasses at the south of forest steppe
| Autor: | P. A. Shary, S. V. Saksonov, L. V. Sidyakina, L. S. Sharaya |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
0301 basic medicine
Crown closure Limiting factor Sunlight 030102 biochemistry & molecular biology Ecology business.industry Terrain 04 agricultural and veterinary sciences Solar energy Atmospheric sciences Forest steppe 03 medical and health sciences 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Environmental science Species richness business Water content General Environmental Science |
| Zdroj: | Contemporary Problems of Ecology. 10:464-475 |
| ISSN: | 1995-4263 1995-4255 |
| DOI: | 10.1134/s1995425517050134 |
| Popis: | The perpendicularity of sunlight incidence on the land surface, called slope insolation, is calculated as the nonlinear function of steepness and exposure. This variable better describes the light and thermal regimes of slopes. We demonstrate that grass-cover insolation can be estimated based on the slope insolation and tree-crown closure. It is found for a terrain at the southern boundary of the forest steppe that species richness and green mass of grasses are closely related to topography and grass-cover insolation (R 2 = 0.77 and R 2 = 0.83, respectively), and crown closure is closely related to topography and slope insolation from the south (R 2 = 0.85). A critical level of crown closure (15%) is determined, so that the limiting factor for grasses is soil moisture below and light above this level. It is shown that grass-cover insolation close to its average value (400 W/m2) differentiates phytocenotic and soil characteristics into areas of increased and diminished values. |
| Databáze: | OpenAIRE |
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