为探究减氮配施生物炭(BC)对椪柑(Citrus reticulata Blanco cv。Ponkan)生长发育和土壤特性的影响，试验设置6个处理(施肥量以单株计):常规施肥(N100，0。910 kg N)、减氮20％(N80，0。728 kg N)、减氮40％(N60，0。546 kg N)、减氮40％+生物炭 10 g(N60+BC10，0。546 kg N+10 g BC)、减氮 40％+生物炭 20 g(N60+BC20，0。546 kg N+20 g BC)和减氮 40％+生物炭 30 g·m-2(N60+BC30，0。546 kg N+30 g BC)，测定分析不同处理的椪柑根系生长、果实品质、单果重与土壤理化特性等。结果表明，与N100相比，N80和N60处理的椪柑根系活力、根系形态、果实品质、单果重、土壤特性均表现出不同程度的下降趋势，而N60+BC10、N60+BC20、N60+BC30处理的相应指标则表现出上升趋势。主成分分析显示，减氮配施生物炭处理得分依次为N60+BC30＞N60+BC20＞N60+BC10，其中N60+BC30处理的果实品质和土壤理化特性表现最佳。
Effects of nitrogen reduction and biochar application on growth and development of Citurs reticulata Blanco cv.'Ponkan'and soil properties
In order to investigate the effect of nitrogen reduction and biochar application on the growth and develop-ment of ponkan citrus(Citrus reticulata Blanco cv.'Ponkan')and soil properties,the experiment was set up with conventional nitrogen application(N100,0.910 kg N),nitrogen reduction of 20％(N80,0.728 kg N),nitrogen reduction of 40％(N60,0.546 kg N),nitrogen reduction of 40％+biochar 10 g(N60+BC10,0.546 kg N+10 g BC),nitrogen reduction of 40％+biochar 20 g(N60+BC20,0.546 kg N+20 g BC)and nitrogen reduction of 40％+biochar 30 g(N60+BC30,0.546 kg N+30 g BC),the amount of fertilizer applied per plant.The root growth,fruit quality,single fruit weight and soil properties of Ponkan in different treatments were measured and ana-lysed.The results showed that compared with N100,the root activity,root morphology,fruit quality,single fruit weight and soil properties of N80 and N60 treatments showed different degrees of decreasing trends,while the corre-sponding indicators of N60+BC10,N60+BC20 and N60+BC30 treatments showed increasing trends.The statisti-cal analysis of principal components showed that the scores of nitrogen reduction and biochar application were in the order of N60+BC30＞N60+BC20＞N60+BC10,among which the fruit quality and soil properties of N60+BC30 treatment were the best.
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