Effects of snow cover thickness on cold resistance and winter survival rates in alfalfa cultivars with different fall dormancies

doi:10.11686/cyxb2015474

Abstract

Abstract:

Four alfalfa cultivars with different fall dormancies (rating 2 Alfaqueen, rating 5 Magna551, rating 8 WL525HQ, and rating 10 Sardi10) were used to study the effects of different snow cover thicknesses on cold resistance and overwintering survival rates. The four cultivars were maintained with 0, 10, and 15 cm winter snow depths. Temperatures were monitored for alfalfa canopy-level and soil surface (1-10 cm). Dynamic variation in malondialdehyde (MDA), soluble sugar (WSC) and soluble protein (SP) contents in collar and stand counts were recorded each fall and spring to assess winter injury. The results showed that without snow cover the winter survival rates of low fall dormancy alfalfa (2, 5) were 64% and 59% respectively, while all the high fall dormancy alfalfa (8, 10) died. With the exception of alfalfa with fall dormancy 10 (Sardi10), a snow cover thickness of 10 cm can ensure the winter safety of alfalfa, with the winter survival rate recorded at over 90%. Increasing snow cover thickness significantly moderated temperatures at alfalfa canopy-level and soil surface. Increased cover significantly improved the winter survival rate of different alfalfa (P<0.05). It increased the SP and WSC content of alfalfa collars in the non- and extremely non-fall dormancy cultivars, and decreased the MDA content. Membership function analysis showed that without snow cover the order of cold resistance and winter survival rate of the alfalfa cultivars was Alfaqueen>Magna551; with snow cover thickness of 10 cm, the order of cold resistance and winter survival rate was Magna551>Alfaqueen>WL525HQ>Sardi10; and with snow cover thickness of 15 cm, the order was Magna551>Alfaqueen=WL525HQ=Sardi10.

YUE Ya-Fei, WANG Xu-Zhe, MIAO Fang, LU Wei-Hua, MA Chun-Hui. Effects of snow cover thickness on cold resistance and winter survival rates in alfalfa cultivars with different fall dormancies[J]. Acta Prataculturae Sinica, 2016, 25(8): 98-106.

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