施肥对马尾松幼苗及根系生长的影响

采用盆栽试验研究了不同施肥处理下马尾松苗木苗高、地径、根系的动态变化。研究表明：施肥对马尾松地上及根系生长有一定促进作用。其中，苗高、地径在单施磷肥时生长最好，到12个月时，分别为16.23、0.29 cm，高于对照67.5 %及155.1 %；根长最长为54.58 cm/株，高于对照69.2 %；主根长相对较短（20.67 cm/株），仅高于对照29.1 %;根表面积较大，为11.86 cm2/株，明显高于对照104.8 %；根尖数较多（239个/株），高于对照16.1 %，侧须根发达。其次是氮、磷、钾肥混施效果较好，而单施氮肥则效果不佳。因此，在马尾松苗木培育过程中，适当施用磷肥可促进大苗、壮苗培育。

Effect on the growth of Pinus massoniana seedlings and root under different fertilizer treatments

Dynamic diversification of the height,diameter and root under different fertilizer treatment was studied.Results showed: the growth of aboveground parts and root under different fertilizer treatments increased more or less.The height and diameter of Pinus massoniana were the best under phosphate fertilizer treatment.The value of height and diameter were 16.23 cm and 0.29 cm after one year and 67.5% and 155.1% higher than that of CK respectively.The root length was 54.58 cm/strains and 69.2 % higher than CK.The main root length was relatively short,20.67 cm/strains,only 29.1% higher than CK.The root surface area was 11.86 cm2/strain and 104.8% higher than the CK.The root tips was 239 in a plant and 16.1% higher than CK.The lateral fibrous roots were well developed under phosphate fertilizer treatment.Followed by the NPK fertilizer mixing facilities,single application of nitrogenous fertilizer was ineffective.Thus,in the process of pine seedling,the appropriate application of phosphate fertilizer can promote sound seedlings cultivation.