间伐强度对辽东落叶松人工林土壤理化性质的影响

Effects of thinning intensity on soil physicochemical properties of Larix kaempferi plantation in eastern Liaoning Province

以辽东山区日本落叶松(Larix kaempferi)人工林为研究对象,采集不同间伐强度(对照、20%、30%和40%)落叶松林的0~10 cm(表层)和10~20 cm(下层)土壤,研究不同间伐强度处理5年后落叶松林土壤理化性质的变化特征。结果表明,间伐5年后,各间伐强度落叶松林土壤容重、总孔隙度、毛管孔隙度、全碳、全氮、C∶N、N∶P以及NO3--N含量与对照之间差异性均不显著,但高强度间伐(40%强度)处理的落叶松林表层土壤田间持水量、全碳、全氮、N∶P及活性碳含量显著高于中度和强度间伐处理,且高强度间伐处理更有利于大径材培育。因此,对于辽东山区日本落叶松人工林经营管理,其间伐强度为40%时更合理。

The present study investigated the response of soil physical and chemical properties of the larch （Larix kaempferi） plantation to thinning intensity after five years in eastern mountainous area of Liaoning Province, through collecting soil sample from the topsoil （0-10 cm） and subsoil （10-20 cm） along a thinning gradient （CK, 20%, 30% and 40%）. The results indicated that there were no significant variations in the soil bulk density, total porosity, capillary porosity, to- tal C content, total N content, C ： N, N ： P, and NO3--N content under different thinning in- tensities, compared to the CK treatment. However, the soil water-holding capacity, total C con- tent, total N content, N ： P, and active carbon content in the topsoil （0-10 cm） under the 40% thinning intensity were significantly higher than under the other two thinning intensities. Further- more, 40% thinning intensity was beneficial to obtaining the large-diameter wood. Therefore, the 40% thinning intensity was preferable to the management of the larch plantations in the eastern mountainous area of Liaoning Province.