- DeHayes , Donald
University of Vermont
Scientists have reported sugar maple decline throughout the northeastern United States and Quebec during the past 50 years. Insect defoliation, drought, and freezing have been implicated as stress factors, and recent studies point to soil and foliar calcium deficiency as potential instigators in sugar maple decline. Calcium is a critical nutrient that helps plant cells sense and respond to stress. Uptake of soil calcium by tree roots is inhibited by high levels of soil aluminum released when acid precipitation disrupts the natural breakdown of rock and soil.