杉木大径材林地土壤养分变化规律

Change Rule of Soil Nutrient of Chinese Fir Large-diameter Timber Forest

为了解林地土壤养分状况,本文对黎平县杉木大径材林地土壤进行分级,并检测土壤养分含量变化规律。结果表明:林地土壤pH呈酸性,土壤有机质较丰富、水解氮中等;其中有效磷含量<2 mg/kg的6级土壤比例达到77.42%严重偏低;有效磷都分布在5、6级土壤,速效钾集中分布在4、5级土壤;除20~40 cm土层与40~60 cm土层速效钾含量差异不显著外,各养分含量在不同土层之间差异水平显著,有效磷和速效钾含量在不同土层之间达到强变异程度。0~60 cm土层的土壤养分含量总体表现为土壤上层养分含量高于下层土壤,随着土层深度增加而降低。

In order to understand the status of soil nutrients in forestland,this paper classified the forestland soil in large diameter timber forest of Chinese fir in Liping County,and detected the change rule of soil nutrient content.The results showed that the pH of forestland soil was acidic,the soil organic matter was abundant and the hydrolyzed nitrogen was medium;the proportion of soil of 6 th grade with available phosphorus content less than 2 mg/kg reached 77.42%,which was seriously low;the available phosphorus was all distributed in soil of 5 th and 6 th grade,while available potassium was concentrated in soil of 4 th and 5 th grade;except the difference of available potassium content between 20-40 cm soil layer and 40-60 cm soil layer was not significant,the differences of nutrient content among different soil layers were significant,and the contents of available phosphorus and available potassium varied greatly in different soil layers.The nutrient content in the soil 0-60 cm soil layer was generally higher than that in lower soil layer,and decreased with the increase of soil depth.