中龄林马尾松细根固土作用的调控

Regulation of fertilization treatment on fine root fixation in middle aged Pinus massoniana plantation

研究不同施肥处理对中龄林马尾松细根生长动态的影响,结合根系与固土作用的关系,阐述施肥对细根固土作用的调控。结果表明:不同施肥处理下细根生物量及形态指标均表现为夏季(8、9月份)最高,冬季(11、12月份)最低,施P肥或者NPK肥合理混施可促进细根生物量及根长等的生长状况,并延长细根生长时间,且在夏季显著高于对照。因此在马尾松中龄林下,通过施用P肥及NPK肥合理混施调控细根的生长,增强其固土效应。

The effects of fertilization treatments on middle-agedPinus massonianafine-root growth dynamics were investigated. By taking into account for the relations of root system and soilfixation, the adjustive function of fertilization treatments onfine root soil fixation was expounded. The results show that the fine root biomass and morphology under different fertilizer treatments were the highest in summer (August and September), those were the lowest in winter months (November and December); the fertilizer P treatment or fertilizer NPK treatment could promoted the growth offine root biomass and root length and extended thefine root reaction time, and in summer, the actions were significantly higher than the CK, the N, K fertilizer treatments had no significant effect. So thefine root biomass and morphology can be regulated through the application of P fertilizer and reasonable mixed NPK fertilizer.