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3个树种与巨桉混交土壤理化性质、凋落物量和养分含量特征

DOI: 10.3724/SP.J.1145.2015.03043, PP. 948-953

Keywords: 巨桉,混交林,土壤理化性质,凋落物量,养分含量

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Abstract:

摘要比较3年半生的红椿、台湾桤木、檫木与巨桉混交的混交林和巨桉纯林的土壤理化性质、凋落物量和养分含量特征.结果表明:红椿、台湾桤木和巨桉混交都有助于减缓土壤的酸化.檫木与巨桉混交能显著改善土壤容重、持水量、孔隙状况,檫木与巨桉混交也能显著增加土壤的全c、n、p、k含量,分别增加了64.7%、41.9%、28.6%、7.7%.台湾桤木与巨桉混交也能显著增加土壤的全c、n、p含量,分别增加了15.2%、27.9%、47.6%.3种混交林土壤水解n都显著低于巨桉纯林,有效p都显著高于巨桉纯林,只有台湾桤木与巨桉混交能显著增加土壤速效k含量,其他两种混交林土壤速效k较纯林显著降低.巨桉红椿混交林凋落物枝、叶现存量都显著高于巨桉纯林,巨桉檫木混交林凋落叶量、凋落物总量略低于巨桉纯林,分别降低了9.8%、9.3%.巨桉台湾桤木混交林凋落物枝、叶现存量都显著低于巨桉纯林.3种混交林凋落物中c元素含量都显著低于巨桉纯林,n元素含量都显著高于巨桉纯林,台湾桤木与巨桉混交能显著增加凋落物中p元素含量,檫木与巨桉混交能显著增加凋落物中k元素的含量.综合考虑各项指标,在此类混交模式下为

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