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滩地杨树人工林皆伐后蒸发散与产流变化
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Journal Article
滩地杨树人工林皆伐后蒸发散与产流变化
2017
Overview
[目的]揭示杨树人工林皆伐对滩地蒸发散和产流的影响。[方法]基于涡度相关系统对长江滩地杨树人工林皆伐前后水汽通量连续3年（2010-2012年）的观测数据，通过对比皆伐前、后气候条件相似的2个时段（1整年）的蒸发散，揭示皆伐后研究区蒸发散的变化，并基于水量平衡反推研究区产流的变化。[结果]皆伐后土壤温度和水位上升，土壤表层含水量全年均值减小约0．03；研究区蒸发散皆伐前、后具有相似的日变化规律和季节动态特征，但皆伐后的全年蒸散量仅为皆伐前的66．3％；皆伐后研究区产流率（产流量／降雨量）从皆伐前的0．53上升至0．62；皆伐前、后7、8、12月的干旱指数（潜在蒸发散／降雨量）均大于l，其他时期均小于1。[结论]滩地杨树人工林皆伐后滩地蒸发散减少而产流率增加，加剧夏季干旱的可能性有所降低，但洪水爆发期间削减洪峰的能力也减弱。
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