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OALib Journal期刊
ISSN: 2333-9721
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模拟氮沉降对土壤酸化和土壤盐基离子含量的影响
DOI: 10.3724/SP.J.1145.2011.00461, PP. 461-466
Keywords: 氮沉降,土壤酸化,盐基离子,阳离子交换量,盐基饱和度
Abstract:
在温室内对1年生盆栽杉木幼苗进行模拟试验，以研究氮沉降对土壤酸化和土壤盐基离子含量的影响.以nh4no3为外加氮源，设置5种处理，分别为n0（对照，0gm-2a-1，以n计，下同）、n1（6gm-2a-1）、n2（12gm-2a-1）、n3（24gm-2a-1）和n4（48gm-2a-1），每处理重复6次.经过18个月的处理后，对盆栽土壤进行取样分析.结果显示，随着氮沉降量的增加，土壤ph值逐渐下降，而土壤交换性酸度和交换性al3+则不断增加.经n1、n2、n3和n4处理后，土壤交换性盐基总量分别下降6.29%、8.94%、10.07%和10.38%，土壤阳离子交换量分别下降5.07%、7.27%、8.53%和8.83%.随氮沉降量的增加，土壤nh4+-n、no3--n含量逐渐增加.低氮处理（n1、n2）使土壤交换性k+、ca2+、mg2+含量增加，而高氮处理（n3、n4）则呈相反趋势.氮沉降由于增加了土壤活性氮的含量，加速了土壤酸化，从而导致了盐基离子的淋失.图3表3参41
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