间伐对云南松林分土壤理化性质的影响效应

以昆明市宜良县花园林场云南松中龄林(抚育间伐、未抚育间伐)为研究对象,利用试验测定和定量统计的方法分析了间伐和未间伐土壤层(0~20 cm,20~40 cm,40~60 cm)的理化性质和化学性质,探讨了短期间伐1 a对云南松林分土壤理化性质的影响,为云南松丰产高效栽培提供一定的理论依据。结果显示:①抚育间伐和土层深度均对土壤理化性质有显著影响(P<0.05),但是交互作用不显著。分析不同土层土壤变异系数发现,抚育间伐之后土壤理化性质变异系数增加。②不同土层深度之间突然理化性质存在显著差异(P<0.05)。随着土层的加深,C和碳储量分别降低66.83%~81.70%,24.06%~35.81%;C∶N和C∶P分别降低63.71%~80.29%和63.06%~80.528%;总孔隙度降低13.80%~16.00%,土壤容重增加15.32%~17.74%。③对土壤理化性质进一步进行相关性分析,C、P和K含量和土壤物理性质显著相关。土壤C含量与P含量显著相关,土壤C和P含量与土壤物理性质显著相关(P<0.05)。研究结果表明,间伐会在短期内显著影响土壤物理性质,而对土壤化学性质的影响不显著。

Effect of Intercropping on Physical and Chemical Properties of Soil in Pinus Yunanensis Stands

In this study,the middle-aged Pinus yunnanensis forest(tending thinning and untending thinning)of the Garden Forest Farm in Yiliang County,Kunming City is used as the research objects,The thinning and unthinning soil layers(0~20 cm,20~40 cm and 40~60 cm)are analyzed by experimental determination and quantitative statistics.The physical and chemical properties of Pinus yunnanensis forest are discussed on the impact of short-term cutting 1a on the soil physical and chemical properties of Pinus yunnanensis,which provides a certain theoretical basis for the high-yield and high-efficiency cultivation of Pinus yunnanensis.The results showed:①Tending thinning and soil depth both had a significant impact on physical and chemical properties of the soil(P<0.05),but the interaction was not significant.Analyzing the coefficient of variation of soil in different soil layers,it is found that the coefficient of variation of soil physical and chemical properties increases after thinning.②There are significant differences in sudden physical and chemical properties between different soil depths(P<0.05).With the deepening of the soil layer,C and carbon storage decreased by 66.83~81.70%and 24.06~35.81%,respectively;C:N and C:P decreased by 63.71~80.29%and 63.06~80.528%,respectively;total porosity decreased by 13.80~16.00%;Soil bulk density increased by 15.32~17.74%.③Further correlation analysis of soil physical and chemical properties,C,P and K content and soil physical properties are significantly related.Soil C content was significantly correlated with P content,and soil C and P content were significantly correlated with soil physical properties(P<0.05).This study shows that thinning will significantly affect the physical properties of the soil in the short term,while the impact on the chemical properties of the soil is not significant.In subtropical regions,it takes a longer time to observe to determine the results of the impact.