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OALib Journal期刊
ISSN: 2333-9721
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控释氮肥对长白落叶松苗木生长的影响
DOI: 10.3969/j.jssn.1000-2006.2011.01.006, PP. 24-27
Keywords: 控释氮肥,长白落叶松,苗木培育
Abstract:
以长白落叶松1年生播种苗为研究对象，进行梯度剂量的控释氮肥与普通氮肥对比处理。结果表明：在相同施氮量下，控释氮肥培育下苗木的苗高、ⅰ级侧根（长度大于5cm）数均比施普通氮肥的多。随着施氮量的增加，控释氮肥培育下苗木总生物量不断增加，当施氮量为360kg/hm2时，长白落叶松播种苗生物量比施普通氮肥的增加24.3%；但与施普通氮肥相比，控释氮肥培育处理下的播种苗高径比和茎根比没有显著差异。在120与240kg/hm2施氮量时，控释氮肥处理下苗木体内氮的积累比施普通氮肥的高，且叶片氮含量占单株氮的比率均较小。因此，控释氮肥有利于氮向苗木的根和茎分配。长白落叶松播种苗在此次试验地条件下的最佳控释氮肥量为240kg/hm2。
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