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通过对杉木幼林施肥 1 a及 1 7a后土壤养分变化的研究 ,结果表明 ,杉木幼林施肥 1 a后 ,比无施肥 ( CK)土壤对照有机质、全氮和速效磷以及土壤 p H值和小于 0 .0 0 1 mm的粘粒变化不大 ,土壤的速效氮增加 1 4.96%～ 1 5.62 %,速效钾增加 2 6.0 9%～ 43.75%;杉木幼林施肥 1 7a后施肥比无施肥 ( CK)的土壤有机质增加 1 7.1 3%～ 2 3.76%、全氮增加 1 2 .37%～ 1 4.67%、速效氮增加 1 3.1 0 %～ 66.2 4 %、速效磷增加 1 3.95%～ 2 4 .2 4 %和速效钾增加 6.52 %～ 36.1 1 %;土壤 p H值和小于 0 .0 0 1 mm的粘粒变化不大 ;3年生杉木施肥后当年效应显著 ,每株施纯元素NPK混合肥 0 .2 5kg( N为 0 .1 5kg;P为 0 .0 5kg;K为 0 .0 5kg) ,即 375kg/hm2 .施肥比无施肥对照 ( CK)树高增加 1 4.0 4 %,地径增加 1 8.36%;1 7a后 ,施肥持续效应也是显著 ,施过肥的比对照 ( CK)树高增加 1 9.79%,胸径增加 1 1 .65%.
The results showed that after young Chinese fir plantation was applied for 1 year, the soil organic matter, total nitrogen and available phosphorus, soil p H values and soil p H values less than 0 .0 0 1 mm clay did not change much, soil available N increased by 1.96% -1 5.62%, available K increased by 2 6.09% ~ 43.75%; young Chinese fir F 1 7 after fertilization than without fertilization (CK) Soil organic matter increased by 7.131-3.276%, total nitrogen increased by 12.37% -1.467%, available nitrogen increased by 3.110% -66.2%, available phosphorus increased by 1.95% -24.4% And available potassium increased by 6.52% -36.1 1%. Soil p H value and clay particles less than 0.0101 mm did not change much. The effect of 3-year-old Chinese fir after fertilization was significant, 5kg (N = 0.1 5kg; P = 0.050kg; K = 0.050kg), ie, 375kg / hm2.Compared with no fertilization control (CK), the tree height increased by 1 4.04% and the diameter increased by 1 8.36 After 1 year, the continuous effect of fertilization was also significant. Compared with the control, CK increased by 1 9.79% and the DBH increased by 11.65%.