Turchina T.A. PHENOLOGICAL SPECTRUM OF BLACK ALDER (ALNUS GLUTINOSA GAERTN.) IN ECOTOPES OF THE EUROPEAN RUSSIA CENTRAL PART STEPPE ZONE // Arid ecosystems. 2019. V. 25. № 1 (78). P. 20-31. | PDF
The duration of the basic phenological stages of black alder development is defined as a result of the long-term researches, which took 21-30 years in the floodplain ecotype, and 12 years in the sandy terraces ecotype. The influence of edaphic factor is shown in expiry dates and duration of separate phenostages. The growth buds form 8 days earlier in the ecotype of sandy terrace, the foliage falls down 2 weeks earlier, and the shoots development period is 7 days longer. The statistically significant distinctions between ecotypes (tf=2.12-7.16>t95=2.01-2.03) were revealed in the duration of flowering process and foliage development. In each ecotype the strongest dependence of phenological stage duration was revealed at the joint influence of warm and water availability of the corresponding period (rx(yz)=0.55-0.99). The identical phenological spectrum in the ecotypes was registered during the years when the average perennial hydrothermic coefficient was exceeded 1.5-2.0 times.
Keywords: steppe zone, black alder, floodplain ecotype, sandy terraces ecotype, seasonal development, phenological stages, ecological distinctions of phenological stage.