摘要
采用样方法对冀北山地落叶松林的枯落物层进行了调查,并对其水文效应进行了研究。结果表明:(1)冀北山地落叶松林枯落物厚度为3.6~4.2cm,生物量的变化范围为8.41~11.46t·hm^(-2),阴坡枯落物的积累量较大。(2)枯落物最大持水量20.8~29.1t·hm^(-2),最大持水率284%~346%;对枯落物的持水量与浸水时间进行回归分析,符合Q=aln(t)+b的对数关系;枯落物在前0.25h内的吸水速率最大,6h左右速率明显降低。(3)枯落物的半分解层拦蓄能力高于未分解层,以样地C(海拔1180~1310m,西北坡,坡度25-30°)的枯落物拦蓄能力最强。
Litter layer of Larix principis-rupprechtii in northern Hebei Province was investigated 〉 its hydrological effect was studied. Result shows that （1） The litter thickness of three species of Larix principis-rupprechtii plan-tation in northern Hebei Province is from 3. 6 cm to 4. 2 cm; the variation range of biomass is from 8. 41 t hm^-2 to 11. 46 t , hm-2 , and the accumulation of litter is Larger. （2） The maximum water holding capacity of litter is from 20. 8 t hm^- 2 to 29. 1 t hm^-2 , and the maximum water holding capacity is from 284% to 346%. The water reten-tion and immersion time of litter were analyzed by regression analysis Q=aln （t ） ＋ b; litter in the first 0. 25 h is the maximum the water absorption rate reduce significantly 6 h or so. （3） Litter of the semi-decomposed layer of storage capacity is higher than that of the decomposition layer, litter storage capacity of sample C is the strongest.
出处
《防护林科技》
2017年第9期14-17,共4页
Protection Forest Science and Technology
关键词
冀北山地
落叶松
枯落物
水文效应
Mountain of northern Hebei Province
Larix principis-rupprechtii
litter
hydrological effect
