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OALib Journal期刊
ISSN: 2333-9721
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闽南山区不同年龄桉树人工林土壤养分动态
DOI: 10.3724/SP.J.1145.2009.00756, PP. 756-760
Keywords: 土壤养分动态,年龄序列,桉树人工林,闽南山区
Abstract:
对闽南山区连续年龄序列（2a、3a、4a、5a、6a）的尾巨桉(eucalyptusurophylla×e.grandis)人工林土壤有机碳及氮、磷、钾含量进行了分析，以评价土壤养分随林分年龄的变化动态.土壤有机碳、全氮、水解氮、全磷、速效磷均表现出随林分年龄增加而增加，到4a生时达到最大，随后则呈下降趋势，6a生时下降到最低值.速效钾含量则随林分年龄增加逐步下降，6a生林分0~20cm、20~40cm和40~60cm这3个土层速效钾含量分别比2a生下降了53.2%、44.4%和55.2%；土壤全钾含量也表现出一定的下降趋势.所有年龄林分的土壤有机碳、全氮、水解氮、全磷、速效磷和速效钾含量均随土层深度增加而降低，而土壤全钾则表现出相反的趋势.因此，在桉树人工林经营过程中，应定期增施钾肥，适时施用有机肥及氮、磷肥，以控制地力衰退.图4表2参24
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