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== Definition ==
== Definition ==
=== Glossary of Ecology (6th ed.) by [[Krebs_2009|Krebs (2009)]] ===
=== Glossary of Ecology (6th ed.) by [[Krebs_2009|Krebs (2009)]] ===
* for plants a shortage of water in winter when the ground is frozen so no water can be taken up by the roots and yet air temperature is high enough that plants attempt to [[photosynthesize]].
* for plants a shortage of water in winter when the ground is frozen so no water can be taken up by the roots and yet air temperature is high enough that plants attempt to photosynthesize.
== 文献（引用） ==
== 文献（引用） ==
