Elevated air humidity significantly reduced height, stem diameter and stem volume increments and transpiration of the trees whereas these effects remained highly significant also after considering the side effects from soil-related confounders within the 2.7 ha study area.
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Climate change at northern latitudes: rising atmospheric humidity decreases transpiration, N-uptake and growth rate of hybrid aspen.
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The sentences
The treatment effect on foliar nutrient concentrations differed between the study years ( Table 4 ) and most of these effects were marginally significant ( q <0.05) through both study years except [K] L , which was substantially ( q <0.01) higher in H plots ( Fig. 4d ).