文章基本信息

标题：Simulated snowmelt and infiltration into frozen soil affected root growth, needle structure and physiology of Scots pine saplings
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作者：Sirkka Sutinen ; Marja Roitto ; Tarja Lehto 等
期刊名称：Boreal Environment Research
印刷版ISSN：1239-6095
出版年度：2014
卷号：19
期号：4
页码：281-294
语种：English
出版社：Finnish Limnological Society
摘要：Climate warming scenarios predict a decreased snow cover and more rain instead of snow in boreal areas in winter. These conditions may affect soil freezing processes. We studied how watering of the soil before and after soil thawing affects fine roots and shoots of Scots pine saplings during the follow-up season. A growth chamber experiment was carried out with four treatments. During the dormancy water was applied onto frozen soil three times (3¥FROSOIL) or once (1¥FROSOIL) whereas in the beginning of the growing season the watering was started when the soil temperature reached +9 (START+9) and +15 °C (START+15). Fine root damage was noted in 3¥FROSOIL, and on a smaller scale also in 1¥FROSOIL. The root growth did not recover during the follow-up season. Due to the root damage, in 3¥FROSOIL there was a reduced transport of water in the saplings, which induced xeromorphic features in the needles developed after the treatment. The fine root damage in 3¥FROSOIL was most probably caused by mechanical breakage after the applied water froze in the soil. Our results suggest that even established saplings may suffer root damage if the climatic and soil conditions favour infiltration and freezing cycles of water, which induce frost heaving.