Throughout the growing season, low Rn and air temperature surpressed stand transpiration during spring. Such control of Rn persisted into summer when sufficient soil water was availiable.
从整个生长季来看，春季该林分蒸腾主要受太阳净辐射和大气温度的抑制，在夏季土壤水分充足时，太阳净辐射仍是控制沙地杨树人工林的蒸腾活动主要因子。
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