Growth features of Juniperus excelsa M. under field vegetation experience of the Southern Coast of the Crimea

Abstract

The dependence of the growth rate of Juniperus excelsa M. Bieb on some environmental factors was studied under the conditions of the Southern Coast. In March, vegetation began at an average daily air temperature of 3.5-7.5°C and the increase in stem diameter was 1% (0.68 mm). In July-August, two sections: the first one - 27.07. - 08. - intensive growth, the second one - after 08. - access to the growth plateau. In September-October there are also two sections: the first one - 01.09. -14.10. - intensive growth, the second section after 14.10. - exit to the growth plateau and the end of the growing season. The optimal environmental factors were: in March-May, Ta=20-26°C, Da=0.4-1.2 kPa, I=300-900 mmol/m²s; July-August, Ta=22-28°С, Da=1.8-2.5 kPa, I=500-1000 μmol/m²s; in September-October, Ta=17-25°C, Da=0.3-1.5 kPa, I=400-800 μmol/m²s, respectively.