施肥对湿地松林分根系生物量的影响

EffectofFertilizerApplicationonRootBiomassinPinuselliottii

摘要:

为了探讨土壤资源有效性对根系生物量与分配的影响，本研究以11 a生湿地松为研究对象，通过对林地施氮肥和磷肥处理，分析湿地松根系生物量变化。结果表明：施氮肥+磷肥会明显增加湿地松的土壤根系生物量，在距离树体30～100 cm时，土壤表层的根系总生物量较CK增加23%～35%,土壤亚表层增加21%～48%,其中土壤表层根系总生物量低于土壤亚表层，这主要由于土壤资源有效性在空间分布上的差异与外界环境条件不同；随着施氮肥+磷肥使湿地松根系生物量的增加，根系不断生长，其根系总根长、总根投影面积和总根表面积也会增加。因此，施用氮肥+磷肥能增加湿地松根系生物量，发挥土壤资源的有效性。

Abstract:

In order to investigate the effect of soil resource availability on root biomass and distribution, the11-year Pinus elliottii plantation was used to analyze the change of wetland pine root biomass by applying nitrogen and phosphorus treatment.The results show that the nitrogen + phosphate fertilizer will increase the soil root biomass of the wetland pine plantation at 30 to 100 cm, the total root biomass of the soil surface increased by 23% to 35% and 21% to 48% in the soil subsurface than the distance of the soil surface than the root biomass of the forest, the total root length, total root projection area and total root surface area.Therefore, the application of nitrogen fertilizer + phosphate fertilizer can increase the root biomass of wetland pine plantation, and promote the effectiveness of soil resources.