PC_s1 was a general description of site climatic conditions, with highly significant effects from all variables (temperature, VPD and precipitation for the growing season and for the entire year).
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Climate and atmospheric deposition effects on forest water-use efficiency and nitrogen availability across Britain.
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The sentences
Whereas, vapour pressure deficit (VPD) did not show a significant trend, except for an increase at the South-eastern most site of Covert Wood (Table 2 ).