Soil nutrient content and stoichiometric characteristics of <italic>Dendrocalamus brandisii</italic> forests in different planting patterns

Objective To investigate the effects of different planting patterns of Dendrocalamus brandisii on soil nutrient content and stoichiometric characteristics，and to provide a scientific basis for the sustainable management of D. brandisii forests. Method Four planting patterns were selected in Mengjiao，a village in Cangyuan County，Yunnan Province，for analysis：D. brandisii × Camellia sinensis（ZC），D. brandisii × Betula alnoides（ZX），D. brandisii × Juglans regia（ZH），and D. brandisii pure forest（CK）.Soil samples from the 0-20 cm layer were collected to determine soil organic carbon（SOC），total nitrogen（TN），total phosphorus（TP），and other nutrient indicators.Soil nutrient content，stoichiometric characteristics，and their correlations were analyzed，and a principal component analysis（PCA was conducted to evaluate the comprehensive soil fertility of different planting patterns. Result （1）Soil total nutrient content responded differently to planting patterns.SOC was significantly higher in ZC than in other patterns（PP>0.05）.TN varied significantly across patterns（PPPP>0.05）.Soil available nutrients showed less sensitivity to planting patterns：available nitrogen（AN）was significantly higher in ZC than in others（PPPP>0.05）.C∶K，N∶P，and N∶K ratios were the highest in ZC.Specifically，C∶K in ZC was significantly higher than in CK（PP>0.05）.N∶P and N∶K in ZC were significantly higher than in all other patterns（PPPPPPPPPCK>ZX>ZH. Conclusion In summary，different mixed tree species create varying microenvironments within the forest，resulting in differences in soil nutrient profiles.The ZC pattern demonstrates the best overall soil fertility among the planting strategies studied.