间伐抚育对小五台山华北落叶松林下枯落物持水特性的影响

从涵养水源角度出发,通过野外调查与浸水实验,对河北省小五台山华北落叶松林下枯落物不同间伐强度下枯落物储量及持水特性进行了研究.结果表明,未分解层和半分解层所占总储量比例在间伐前后存在明显差异.间伐抚育前,未分解层所占总储量比例小于半分解层,间伐后则相反.枯落物储量和最大持水量在不同间伐强度间变化顺序相同,均为:弱度间伐＞对照＞中度间伐＞强度间伐＞超强度间伐.枯落物储量和最大持水量在不同间伐强度间存在显著差异(p＜o.01),最大持水率在不同间伐强度间差异不显著(p＞0.05)；在以保留木数量为600株/hm2的强度间伐时,有效拦蓄量最大为162.41 t/hm2,相当于16.241 mm降水.

Influences of Thinning on Water-holding Characteristics of Litters for LarixPrincipis Rupprechtii Forest in Xiaowutai Mountains

From a water conservation perspective,the cumulated mass(CM)and water-holding characteristics of litter were studied at different thinning intensities of Larix principis-rupprechtii forest in Xiaowutai Mountains based on field investigation and indoor experiment.Results showed that there were significant differences in the CM of different layers(un-decomposed and half-decomposed)before and after thinning.The ratio of the un-decomposed layer to the CM was smaller than the half-decomposed before thinning,but contrary after thinning.In all the sample plots,the CM and the maximal water holding capacity(MWHC) varied in the same order of light thinning>control>medium thinning>heavy thinning>super-strong thinning.There were significant differences in the CM and MWHC at different thinning intensities(p <0.01),but insignificant differences in the maximal water holding rate(p >0.05).The modified interception rate showed the maximum of 162.41t/hm² at the thinning intensity of 600 plants/hm²(reserved trees),which was equivalent to 16.241mm precipitation.