连栽马尾松人工林土壤肥力比较研究

采用配对样地法,以不同栽植代数(1、2 代)、不同发育阶段(8、15、18、20 a)的马尾松人工林为对象,研究了连栽幼龄林、中龄林土壤肥力的变化情况。结果表明:连栽后,无论是幼龄林还是中龄林,林地土壤密度趋于下降,土壤总孔隙度和含水率则呈上升趋势,林地土壤物理性质得到改善,且中龄林20~40 cm层土壤密度和总孔隙度在1、2代间的差异达显著水平;连栽后,林地土壤全K、全Mg及pH值趋于下降,而有机质、全N、全P、全Ca及速效N、P、K养分均呈上升趋势,且幼龄林0~20 cm层土壤有效P含量以及土壤pH值、中龄林0~20 cm层土壤水解N含量以及土壤全N、有效P、速效K、全K含量在1、2代间的差异达显著或极显著水平。连栽后,幼龄林和中龄林土壤全Fe、Al、Cu、Zn、Mn含量均呈下降趋势,且Mn含量在1、2代幼龄林和中龄林间的差异达显著水平。

Comparison on Soil Fertilities of Masson Pine Plantations of Different Generations

The changes of soil fertilities on young and half-mature Masson pine (Pinus massoniana) plantations with different generations were studied through the pair method with different generations (1, 2) and ages (8, 15, 18, and 20 a). The results as follows: after successive rotation,regardless of being the young growth or the half-mature forest,the soil density decreased,soil total porosity and soil moisture were on the rise, the soil physical properties was got improvement. The differences of soil density and soil total porosity in 20-40 cm half-mature forest between first and second generation were significant level. After successive rotation, the total K, total Mg and pH were declining, while the organic matter, total N, total P, total Ca and alkaline hydrolysis N, available P, available K were on the rise, and the differences of available P in 0-20 cm young forest and pH, the differences of alkaline hydrolysis N in 0-20 cm half-mature forest and total N, available P, available K,total K between first and second generation were significant or most significant level. The soil total Fe, Al, Cu, Zn, and Mn contents in young and half-mature forest were declining, and the differences of total Mn contents in young and half-mature forest between first and second generation reached significant level.