Effects of fertilization on growth of eight-year-old Caribbean pine in West Guangdong
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摘要:目的
研究阳江8年生古巴加勒比松Pinus caribaea var.caribaea人工林对氮磷钾不同配比及与微量元素混施的肥效反应。
方法设定17个氮磷钾不同配比及与微量元素混施的追肥处理, 15个月后监测古巴加勒比松的生长量和养分。
结果协方差分析结果表明, N(21.5 g·株-1)、P2O5(30 g·株-1)的配比处理效果最好。单株施用50 g尿素+250 g钙镁磷肥+25 g氯化钾处理15个月后, 单株材积增量比空白对照平均可提高23.6%。加磷(N2P1K2、N2P2K2)比无磷处理(N2P0K2)的生长量显著增大。另外, 在氮磷钾相同情况下, 添加硼对材积也有显著促进作用。
结论磷与硼是影响郁闭后加勒比松生长的重要元素。氮磷配比对肥效反应有重要调控作用。
Abstract:ObjectiveIn order to study the fertilizer response in an eight-year-old Pinus caribaea var.caribaea plantation in Yangjiang to the application of different proportions of nitrogen(N), phosphorus(P) and potassium(K) fertilizers mixed with microelements.
MethodThere were 17 top application treatments of different proportions of N, P and K fertilizers mixed with microelements.The growth and foliar nutrient concentrations of P.caribaea var.caribaea were determined after 15 months.
ResultThe covariance analysis showed that the optimum proportion of fertilizers was N (21.5 g·plant-1) and P2O5 (30 g·plant-1).The individual stem volume of plants fertilized with 50 g urea+250 g calcium magnesium phosphate fertilizer+25 g KCl for 15 months was increased by 23.6% on average compared to the blank control.The treatments with P (N2P1K2, N2P2K2) had significantly more growth compared to the P deficiency treatment (N2P0K2).In addition, boron(B) application significantly increased the stem volume under the same N, P and K treatment.
ConclusionP and B are both important for P.caribaea var.caribaea growth after canopy closure.The proportion of N and P plays an essential role in regulating the fertilizer response of P.caribaea var.caribaea.
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图 1 不同氮施用量对加勒比松人工林单株生长的影响
图中4个处理中, 施P2O5=30 g·株-1, 施K2O=30 g·株-1。图中的值为最小二乘均数(LSMEAN)及其标准误, 同一性状不同处理柱上凡有一个相同小写字母者, 表示该性状不同处理间差异不显著(P>0.05)。
Figure 1. The effects of N application amounts on the growth of individual Pinus caribaea var.caribaea plant
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图 2 不同P2O5施用量对加勒比松人工林单株生长的影响
图中4个处理中, 施N=43 g·株-1, 施K2O=30 g·株-1; 图中的值为最小二乘均数(LSMEAN)及其标准误, 同一性状不同处理柱上凡有一个相同小写字母者, 表示该性状不同处理间差异不显著(P>0.05)。
Figure 2. The effects of P2O5 application amounts on the growth of individual Pinus caribaea var.caribaea plant
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图 3 不同K2O施用量对加勒比松人工林单株生长的影响
图中4个处理中, 施N=43 g·株-1, 施P2O5=30 g·株-1; 图中的值为最小二乘均数(LSMEAN)及其标准误, 同一性状不同处理柱上凡有一个相同小写字母者, 表示该性状不同处理间差异不显著(P>0.05)。
Figure 3. The effects of K2O application amounts on the growth of individual Pinus caribaea var.caribaea plant
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图 4 添加不同微量元素对加勒比松人工林单株生长的影响
图中5个处理中, 施N=43 g·株-1, 施P2O5=30 g·株-1, 施K2O=30 g·株-1。图中的值为最小二乘均数(LSMEAN)及其标准误, 同一性状不同处理柱上凡有一个相同小写字母者, 表示该性状不同处理间差异不显著(P＞0.05)。
Figure 4. The effects of different micronutrients on the growth of individual Pinus caribaea var.caribaea plant
表 1 不同追肥处理方式下单株氮磷钾施用量
Table 1 The amounts of NPK fertilizers applied to individual plant under different top application treatments
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表 2 施肥对加勒比松生长变化影响的协方差分析1)
Table 2 Analysis of covariance of effect of fertilization on Pinus caribaea var.caribaea growth
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表 3 加勒比松生长在不同施肥处理下的表现1)
Table 3 Pinus caribaea var.caribaea growth under different fertilization treatments
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表 4 加勒比松在8种施肥处理下的针叶养分含量1)
Table 4 The foliar nutrient concentrations of Pinus caribaea var.caribaea under eight fertilization treatments
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