杨树人工林冻裂率为60%以上。
本文报道了施肥4年对杨树人工林土壤养分的消长、水分物理特性及土壤微生物的影响。
This paper deal with the effect of fertilization for 4 years on the changes of the soil nutrients, the soil water physical characters and the soil microbes in the poplar plantation.
应用土壤养分状况系统研究法(SNSA法)对江汉平原杨树人工林土壤养分状况进行了评价。
A study was conducted to evaluate the soil nutrient status of poplar plantations by soil nutrient Systematic Approach (SNSA) in Jianghan Plain, Hubei Province.
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。
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。
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.
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