[目的] 探究杉木人工幼林的施肥技术及其效益分析.[方法] 在对7年生杉木人工幼林的施肥对比试验中,设3种施肥处理:钙镁磷肥500 g/株、尿素250 g/株和磷肥250 g/株+尿素125 g/株,不施肥为对照,采用挖环状沟施肥法,年底11月根据树高生长和胸径生长量调查,计算各试验区立木材积和蓄积量.[结果] 施肥5年后杉木人工林的立木蓄积量,以施磷肥处理的效果最好,比对照区年均增加立木17.13 m3/hm2,净产值增加33 776元/hm2;磷肥+尿素混合施效果次之,比对照区年均增加立木9.04 m3/hm2,净产值增加16 284元/hm2;施尿素对林木作用不大,仅比对照区年均增加立木2.38 m3/hm2.[结论] 磷肥施用效果最佳,施入后杉木人工幼林的林木生长平稳,其效果随时间的推移越趋明显.%[Objective] The study aimed to explore the fertilizer technology for young plantation of Chinese fir and its benefit analysis. [Method] In the contrast test on the fertilizer application for 7-year-old young plantation of Chinese fir, 3 treatments of fertilizer application were set up as the calcium magnesium phosphate 500 g/plant, urea 250 g/plant and phosphate fertilizer 250 g/plant + urea 250 g/plant, with no fertilizer application as CK and they were applied to the young plantation through digging ring channel. The stock volume in each test plot were counted according to the investigation on the growth of tree height and the increment of tree chest diameter in the end (Nov.) of the year annually. [Result] As for the stock volume of the young plantation of Chinese fir after fertilizer application for 5 years, compared with the CK plot, the effect of phosphate fertilizer application was the best, with the stock volume increasing by 17.13 m3/hm2 on annual average and the net output value increasing by 33 776 yuan/hm2, that of the mixed application of phosphate and urea fertilizer was next, with the stock volume increasing by 9.04 m3/hm2 and net output value increasing by 16 284 yuan/hm2 on annual average, and that of urea fertilizer application was little, with the stock volume increasing only by 2.38 m3/hm2. [Conclusion] The phosphate fertilizer application got the best effect. After phosphate application, the forest growth of the young plantation of Chinese fir could be stable and its fertilizer effect was more obvious with time process of application.
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