以长白落叶松播种苗(1-0)为试验材料,采用裂区设计,主区为磷肥量,副区为水施比例,研究了磷肥量和水施比例对苗木生长和磷吸收的影响。结果表明:各组织磷浓度、磷肥利用率在3个磷肥处理间差异显著,其中各组织磷浓度在326 kg／hm2磷肥处理下达到最大,而磷肥利用率则在最小磷肥量163 kg／hm2处理下达到最大,平均值为43 ％,并且随磷肥量的增大而逐渐降低;各组织磷质量分数、磷含量以及磷肥利用率在5种水施比例间差异达到显著水平,并且在333 ％水施比例处理下达到最大,其中全磷含量平均值为0079 g／株,磷肥利用率平均值为43 ％。因此在326 kg／hm2磷肥施用量下,将2／3磷肥用做底肥,1／3磷肥用于水施追肥为最佳长白落叶松播种苗磷肥施肥方式。
Abstract
Phosphorus（P） is hard to dissolve and be absorbed for plants.To improve the P efficiency and find the best P applying method, Larix olgensis sowed seedlings (1-0) were used to study the growth effect and Puptaking by seedlings affected by P amounts and fertigation ratios.The experiment conducted the splitspot design,with P amounts as main treatment and fertigation ratios as side treatment. The results showed that P concentration, P content,phosphorus using efficency was affected by phosphorus amounts significantly. The P concentration arrived the highest lever under the phosphorus amount 326 kg／hm2,but the phosphorus use efficency increased as the phosphorus deceased,and arrived the highest lever (43 ％)under the phosphorus amount 163 kg／hm2. At the same phosphorus amounts,fertigation ratios also had remarkable effect on P concentration, P content and phosphorus using efficency. Maximum of these indicators exhibited under 333 ％ fertigation ratio, for example the total P content and phosphorus use efficiency were 0079 g and 43 ％ respectively. The results showed that the best fertigation ratio was 333%. So a combination of two thirds of the phosphorus as basal fertilizer when transplanted, and one third as topdressing in August is the best phosphorus applying method for L. olgensis sowed seedlings.
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基金
收稿日期：2010-07-08修回日期：2010-12-27基金项目：中央高校基本科研业务费专项资金项目(BLJD200905);“十一五”国家科技支撑计划(2006BAD24B01);国家自然科学基金项目(30972353)作者简介：孙宇 (1985—),硕士生。*刘勇 (通信作者),教授。Email:lyong@bjfu.edu.cn。
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