马尾松复层混交不同密度大叶栎对林分生长及土壤理化性质的影响OA

In order to clarify effects of Pinus massoniana plantation multi-layer mixed with Quercus griffithii different densities on stand growth and soil physical and chemical properties,and screen suitable P.massoni-ana-Q.griffithii multi-layer mixed plantation configuration,two density treatments of P.massoniana-Q.griffithii mixed plantations were established(T1:3 000 individuals/hm2,T2:1 667 individuals/hm2)and taking P.massoniana pure plantation as control(CK),indexes of stand growth characteristics,timber value and soil physical and chemical properties were measured and entropy weight method was adopted to evaluate soil com-prehensive fertility.Results showed that multi-layer mixing could improve total timber value.Based on evalua-tion of soil fertility index(SFI),it was found that soil comprehensive fertility of T1 stand was significantly higher than those of T2 stands and CK.SFI showed as T1>T2>CK.Correlation analysis indicated that contents of soil organic carbon,total nitrogen,available phosphorus and hydrolyzable nitrogen as well as field capacity,capil-lary water-holding capacity,maximum water-holding capacity and bulk density were core factors to drive im-provement of SFI.SFI was significantly positively correlated with total stand accumulation and total timber val-ue.Multi-layer mixed mode of P.massoniana-Q.griffithii could realize synergistic effect of total timber value improvement and soil fertility improvement.High-density interplanting(T1)mode could rapidly increase total stand accumulation,improve soil fertility and enhance economic benefits,whereas low-density interplanting(T2)mode had obvious advantages in cultivating high-quality and large-diameter broad-leaved woods.