林下种植巴西铁对土壤理化性质的影响

目的]研究林下种植巴西铁对土壤理化性质的影响。方法]2004和2005年两次采集土壤样品,经过室内分析,研究琼中县百花岭林场种植巴西铁前后林下土壤理化性质的变化情况。结果]试验区土壤多为石质中壤土。2005年较2004年土壤样本的有机质含量明显减少,速效钾含量变化不明显。0～20cm土层的pH值极显著降低,土壤的酸性极显著增强。20～40cm土层的有机质和速效钾含量变化都不显著,pH值极显著降低。土壤样品的速效磷含量为痕量。0～20cm土层的有机质含量明显比20～40cm土层的高,但速效钾和pH值的变化不大。结论]林下种植巴西铁对土壤有机质含量及pH值有显著的影响,有机质和速效钾的含量明显减少,同时降低土壤pH值,增加土壤保肥性能。

Primary Discussion on the Influence of Planting Dracaena Sanderiena under Forest on the Physical and Chemical Characteristics of Soil

Objective] The purpose was to study the influence of planting Dracaena sanderiena under forest on the physical and chemical characteristics of soil.Method] The soil samples were collected twice in 2004 and 2005.The change situation of the physical and chemical characteristics of soil under forest before and after planting D.sanderiena in Baihualing forest farm of Qiongzhong County was studied by indoor analysis.Result] Most soil in experimental area was neutral lithoid soil.The content of organic matter in soil sample reduced obviously in 2005 than in 2004,and the content of available potassium had no obviously change.The pH value reduced extremely significantly and the acidity of soil increased extremely significantly in 0～20 cm soil layer.The content changes of both organic matter and available potassium were not significant,and the pH value decreased extremely significantly in 20～40 cm soil layer.The content of available phosphorous in soil samples was trace amount.The content of organic matter in 0～20 cm soil layer was obviously higher than that in 20～40 cm soil layer,the change of available potassium and pH value was little.Conclusion] Planting D.sanderiena under forest has significant influence on the content of organic matter and pH value in soil,which reduces the contents of organic matter and available potassium obviously and simultaneously decreases pH value in soil and increases the fertilizer retention of soil.