抚育间伐对华北落叶松枯落物与土壤持水量的影响研究

Influence of Tending Thinning on Water Holding Capacity of Litter and Soil in Larix Principis-rupprechtii

以塞罕坝地区华北落叶松纯林和混交林作为对象,研究抚育间伐前后枯落物厚度,储量,土壤持水能力以及孔隙度的变化,探究抚育间伐的积极作用。结果表明,枯落物厚度抚育后大于抚育前,其中,抚育后抚育样地枯落物厚度的增加量小于对照样地;枯落物总储量表现为抚育样地的减少量小于对照样地,说明抚育后枯落物储量增多;枯落物最大持水量和最大持水率均值抚育后大于抚育前,且抚育样地的增加量大于对照样地,从总体来看未分解层最大持水量和最大持水率均高于半分解层;土壤容重无明显变化;总孔隙度均值表现为抚育后大于抚育前,最大持水量除10~20cm层抚育后大于抚育前,其余层均小于抚育前,最小持水量和毛管持水量除0~10cm层抚育后小于抚育前,其余各层均大于抚育前,自然含水量抚育后大于抚育前。

In this paper,the pure and mixed forests of Larix principis-rupprechtii in Saihanba region were studied as subjects to study changes in litter thickness,reserves,soil water holding capacity,and porosity before and after thinning to explore the positive effects of thinning and thinning.The results showed that the thickness of litter was greater than that before nursery,and the increase of litter thickness after tending was less than control plot.The total litter storage showed that the decrease of tending plot was less than the control plot.It shows that the litter reserves increase after tending.The maximum water holding capacity and the maximum water holding capacity of the litter were greater than those before tending,and the increase amount of the rearing plot was greater than that of the control plot.The overall water holding capacity and maximum water holding capacity of the undecomposed layer were generally high.In the semi-decomposition layer.There was no significant change in soil bulk density.The mean total porosity is expressed as follows:after tending more than before tending,the maximum water holding capacity except 10~20cm layer after tending is greater than before tending,the remaining layers are smaller than before tending,the minimum water holding capacity and capillary water holding capacity are divided by 0-10cm layer after tending less than tending Before the rest of the layers were larger than those before tending,the natural water content was greater than that before tending.