秋季施肥对油松容器苗生长·氮吸收和抗寒性的影响

目的]研究秋季施肥对油松容器苗生长、氮吸收和抗寒性的影响。方法]对在生长期经过不同指数施肥水平10、40、80和120mg/株处理过的油松容器苗进行秋季施肥,设置4个处理水平0(对照)、12、24和48 mg/株,苗木在温室培育一个生长季并在翌年进行造林试验。结果]秋季施肥24 mg/株为最佳处理,在40E-24处理下,N含量相比对照增加了15.9%,抗寒性在-20℃下更提高了95.2%,造林效果最佳。结论]秋季施肥可有效提高苗木体内养分含量,抗寒性及翌年造林效果。但过量的秋季施肥(48 mg/株)并不促进苗木生长甚至有抑制或者损害作用。

The Effect of Fall Fertilization on Pinus tabulaeformis Container Seedlings Growth, Nitrogen Uptake and Cold Tolerance

Objective]Study the effect of fall fertilization to Pinus tabulaeformis container seedlings growth,nitrogen uptake and cold tolerance.Method]We make fall fertilization to Pinus tabulaeformis container seedlings,which have been processed in exponential fertilization level of 10,40,80,and 120 mg/plants in the growing season,set four treatment levels of 0(control),12,24 and 48 mg/plants,seedlings will besed to do afforestation experiment after a growing season in the greenhouse cultivation in the following year.Result]While fall fertilization of 24 mg/plants is the best treatment,under the treatment of 40E-24,N content was increased 15.9% compared to the control,cold resistance at-20 ℃ has increased 95.2%,afforestation effects are the best.Conclusion]Fall fertilization can improve the nutrient content,cold tolerance and afforestation effects the following year.On the contrary,excessive fall fertilization(48 mg/plants)does not promote seedling growth but inhibit or damage.