油松蒙古栎混交林细根生物量及养分现存量研究

应用固定样地调查生物量的方法,在辽宁省建平县干旱所南大山试验区进行了油松蒙古栎混交林细根生物量和养分现存量的研究。结果表明,混交林的细根生物量大于油松纯林,两树种混栽后蒙古栎能促进油松的细根生长,提高油松细根生物量在混交林中的比例;混交林细根在各土层中分布得比纯林更均匀、更合理,两树种根系生长协调;混交林细根N、P养分现存量分别是纯林的1.1倍和1.2倍,可见混交林细根具有比纯林更高的养分积累和周转能力;纯林和混交林人工林的各径级活细根和死细根养分现存量都随细根径级的增加而减少,说明≤2 mm径级的细根在细根的养分循环中起主导作用。

Study on Fine Root Biomass and Nutrient Status in Mixed Plantation of Quercus mongolicus and Pinus tabulaeformis

Study on fine root biomass and nutrient status by sample plot survey in mixed plantation of Quercus mongolicus and Pinus tabulaeformis was conducted in Nandashan of the west Liaoning province.The result showed that fine root biomass in the mixed plantation was higher than that in pure stand of P.tabulaeformis.Mixed plantation could promote fine root growth of P.tabulaeformis by Q.mongolicus,and increase the rate of fine root biomass of the pine.Nutrient status of N and P in fine root of mixed stands were 1.1 and 1.2 times of that of pure stands.It means that fine root of mixed stands had higher accumulation capacity and more rapid turnover rate of nutrients.