【摘要】 为明确马尾松补植不同密度大叶栎的混交林下植物多样性、水源涵养和土壤养分变化规律，筛选马尾松补植大叶栎的适宜密度，为马尾松×大叶栎复层混交林营建提供理论基础。以马尾松补植4种密度大叶栎(T1为3 000株·hm^-2、T2为2 500株·hm^-2、T3为1 667株·hm^-2、T4为1 250株·hm^-2)及马尾松纯林对照（CK）为研究对象，调查混交林下植物多样性、凋落物及土壤理化性质等指标，并结合因子分析与隶属度函数法对马尾松×大叶栎复层混交林林分质量进行综合评价。结果显示：灌木层物种数显著高于草本层；马尾松×大叶栎混交林（T3、T4）的林下植物多样性显著优于马尾松纯林。T1凋落物总蓄积量最大；T2凋落物有效持水量最大；T4凋落物最大持水量最大。土壤容重以T1最优；土壤最大持水量以T3最大；在各土层中，全氮、全磷含量均以T4最高。灌木层Shannon多样性指数与土壤有机质、全氮、水解氮及凋落物有效持水量呈极显著正相关；因子分析和隶属函数法计算马尾松补植不同密度大叶栎林分质量综合评价值以T3林分最大为0.794,显著高于其他林分，其大小顺序为T3>CK>T4>T2>T1。研究结果表明：马尾松×大叶栎复层混交林营建过程中首选马尾松补植1 667株·hm^-2的大叶栎，具有改善土壤肥力，增加林分涵养水源能力和维持植物多样性的效果。更多还原

【Abstract】 In order to clarify the changes of plant diversity, water conservation and soil nutrients under different densities of Pinus massoniana replanting Quercus griffithii forest, the suitable density of P. massoniana replanting Q. griffithii was screened, which provided a theoretical basis for the construction of P. massoniana×Q.griffithii mixed forest.Four kinds of density of Q. griffithii(T1:3 000 plants·hm^-2,T2:2 500 plants·hm^-2,T3:1 667 plants·hm^-2,T4:1 250 plants ·hm^-2)and pure P.massoniana forest（CK）were replanted as the research objects.The plant diversity, litter and soil physical and chemical properties of mixed forest were investigated, and the quality of P. massoniana×Q. griffithii mixed forest was comprehensively evaluated by factor analysis and membership function method.The results showed that the number of species in the shrub layer was significantly higher than that in the herb layer.The understory plant diversity of P.massoniana×Q. griffithii mixed forest（T3,T4）was significantly better than that of the P. massoniana pure forest.The total litter accumulation of T1 was the largest, and the effective water-holding capacity of T2 litter was the largest.The maximum water-holding capacity of T4 litter was the highest.The soil bulk density of T1 was the best, and the maximum water-holding capacity of the soil was the highest in T3.In each soil layer, the contents of total nitrogen and total phosphorus were the highest in T4.The Shannon index of the shrub layer was significantly positively correlated with soil organic matter, total nitrogen, hydrolyzable nitrogen, and litter effective water-holding capacity.Factor analysis and membership function method were used to calculate the comprehensive evaluation value of P.massoniana replanted with different densities.The maximum T3 stand value was 0.794,which was significantly higher than those of the other stands, and the order was T3>CK>T4>T2>T1.The results showed that P. massoniana replanting 1 667 plants · hm^-2Q. griffithii was the first choice in the construction of P.massoniana×Q.griffithii multi-layer mixed forest, which could improve soil fertility, increase water conservation capacity, and maintain plant diversity.更多还原