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5 cm）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360 kg/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240 kg/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240 kg/hm2。
Abstract
A filed experiment was conducted to compare the effect of controlledrelease fertilizer (CRF) on the growth of one year old Larix olgensis seedling with conventional urea at 0, 120, 240, and 360 kg/hm2 N rate. The results showed that both the height and firstorder lateral roots（L＞5 cm）were significantly enhanced when L. olgensis seedlings were applied with CRF as compared with common nitrogen fertilizer irrespective of rate. And at 360 kg/hm2 rate, the dry mass increased by 24.3 % applying the CRF in contrast to common urea. While no significant differences were found in either height to diameter ratio, or shoot to root mass ratio in the nitrogen types. At rates of both 120 kg/hm2 and 240 kg/hm2 nitrogen application, more nitrogen content was associated with the seedlings under CRF treatments, whereas the less ratio of leaf to total nitrogen content was found in the seedlings applied with CRF, indicating that at low and moderate CRF rates, seedlings absorbed more nitrogen and allocated more nitrogen to the stem and root. Combined results for seedling response to the urea source and their rates indicated that CRF was superior to conventional urea and the optimal rate was 240 kg/hm2 rate.
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基金
收稿日期：2010-04-01修回日期：2010-10-25基金项目：“十一五”国家科技支撑计划（2006BAD24B01）；中央高校基本科研业务费专项资金项目（BLJD200905）作者简介：祝燕(1985—)，博士。*刘勇（通信作者），教授。 Email: lyong@bjfu.edu.cn。
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