间伐对黄龙山辽东栎林下枯落物持水性的影响

目的]对黄龙山林区辽东栎林抚育间伐与对照设置试验样地,研究其林下枯落物持水效应特征,为该地区森林抚育提供理论依据。方法]采用重度(间伐35%)、中度(间伐25%)、轻度(间伐15%)抚育间伐,通过典型取样法、烘干法、浸泡法等开展研究。结果]枯落物总储量大小依次表现为:CK(23.500±0.780)轻度(22.950±1.012)中度(22.708±0.365)重度(20.725±1.041),只有CK与重度有显著性;枯落物总持水量大小依次表现为:轻度(9.37)CK(8.29)中度(7.61)重度(6.39),轻度间伐下枯落物总有效拦蓄量最大;枯落物持水量与浸泡时间呈对数函数变化,R2均在0.93以上,具有显著相关性;枯落物吸水速率与浸泡时间呈幂函数变化,R2均在0.99以上,具有显著相关性。结论]综合比较不同间伐强度下枯落物持水性,轻度间伐下枯落物持水性较好,可为黄土高原地区森林抚育提供理论依据。

Effects of Thinning on Litter's Water Holding Capacity of Quercus Wutaishanica Forest Understory in Huanglong Mountain

Objective] The effects of thinning on the water holding features of forests understory litter were studied to provide theoretical basis for local regional forest tending.Methods] The experimental had thinning treatments of heavy thinning(thinning 35%), medium thinning(thinning 25%), light thinning(thinning 15%) and the control(no thinning) in Quercus wutaishanica forest of Huanglong Mountain in Loess Plateau. Typical sampling method, drying method and soaking method were used to measure water holding traits.Results] Total litter volumes ranked as:CK(23.500±0.780) > light thinning(22.950±1.012) > medium thinning(22.708±0.365) > heavy thinning(20.725±1.041). Only the difference between CK and heavy thinning was significant; The total water holding capacities ranked as:light thinning(9.37) > CK(8.29) > medium thinning(7.61) > heavy thinning(6.39); the total effective retain capacity of light thinning is maximum. The litter water holding capacity presented a significant logarithmic function with soaking time as independent variable and the R² was above 0.93. Meanwhile, water absorption rate had a significant power function with soaking time, their R² was above 0.99.Conclusion] Water holding capacity of light thinning performed the best. This is theoretically important for regional forest tending.