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OALib Journal期刊
ISSN: 2333-9721
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施肥对1年生桢楠幼苗生长及主要土壤肥力指标的影响
DOI: 10.3724/SP.J.1145.2014.07017, PP. 129-138
Keywords: 施肥,桢楠,幼苗生长,土壤肥力,微生物生物量,土壤酶
Abstract:
采用盆栽的方法，研究施用氮肥（nf）、复合肥（cf）、有机肥（of）和混合肥（mf）对1年生桢楠（phoebezhennans.lee）幼苗期生长与土壤肥力的影响.以年施氮量为标准，设置低（l，0.3g/桶）、中（m，0.6g/桶）、高（h，0.9g/桶）3个施肥水平，于2013年5、7、9月份分3次将各肥料平均施入各栽植桶中，施肥1个月后测定土壤养分、微生物生物量碳、氮以及土壤酶活性指标，且最后一次同时测定桢楠苗高和地径生长量，初步探讨施肥影响桢楠生长的同时对土壤肥力的作用.结果表明：（1）中氮水平的有机肥（mof）对桢楠生长的促进效应最大，其生长量可以达到ck的2倍；且土壤肥力得到了明显的提高，这种优势可以持续到施肥后期（9-10月）；（2）氮肥和复合肥对桢楠生长起到了微弱的促进作用，但不能有效提高甚至维持土壤肥力；（3）混合肥由于在氮肥的基础上配合施用有机肥，与氮肥相比不仅改善了土壤肥力状况，还显著促进了桢楠生长；（4）桢楠生长状况（苗高、地径生长量）均与土壤蔗糖酶活性、微生物生物量氮呈极显著正相关（p<0.01），故这两个指标可以有效反映桢楠生长状况.综合来看，中氮水平的有机肥是最佳施肥方案.
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