Abstract: Abstract：This study aimed to investigate the eff ects of intercropping cassava on chili pepper growth， photosynthetic performance，soil enzyme activities，yield，and insect pest infestation．Using chili pepper‘Xiangyan No.55’and cassava‘Nanzhi 199’as experimental materials，and monoculture chili pepper（CK）as the control，three planting densities of chili peppers（T1，T2，and T3 treatments，with plant spacings of 0.4，0.5，and 0.6 m，respectively）were established in the intercropping system．The results indicated that under T1 treatment，both the stem diameter and net photosynthetic rate of chili peppers were inhibited to varying degrees．T2 and T3 treatments signifi cantly increased the plant height of chili peppers，with no signifi cant impact on stem diameter．Additionally，T2 and T3 treatments enhanced the relative chlorophyll content，intercellular CO2 concentration，and stomatal conductance of chili pepper plants，while enhancing the net photosynthetic rate during the initial fruiting stage of peppers．The soil catalase and sucrase activities under T1 treatment were significantly lower than those under CK．In contrast，T2 and T3 treatments significantly increased soil urease and acid phosphatase activities．There was no signifi cant diff erence in yield between the intercropping T2 treatment and CK，whereas the yields of T1 and T3 treatment were lowered comparing to the CK．Notably，T1 and T2 treatments were eff ective in mitigating the damage caused by whitefl y and tobacco greenfly，exhibiting better relative pest control effi cacies．In conclusion，the T2 cultivation pattern，involving two rows of cassava intercropped with two rows of chili peppers at a spacing of 0.5 m between chili peppers， was optimal and suitable as an intercropping model for chili peppers and cassava in Hunan production areas．

Key words: Keywords：chili pepper, cassava, intercropping, photosynthetic performance, soil, yield, insect pest

摘要： 摘 要：为研究间作木薯对辣椒生长、光合性能、土壤酶活性、产量和虫害的影响，以辣椒（湘研55 号）和木薯（南植199）为试验材料，以单作辣椒（CK）为对照，设置辣椒和木薯间作时辣椒3 种种植密度（株距分别为0.4、0.5、0.6 m，即T1、T2、T3 处理）。结果表明：T1 处理下辣椒的茎粗和叶片净光合速率均存在不同程度的抑制；T2、T3 处理可以显著增加辣椒株高，对辣椒茎粗则无显著影响；T2、T3 处理还可以提高辣椒植株的叶绿素相对含量、胞间CO2 浓度、气孔导度，并提高辣椒初果期的净光合速率。T1 处理的土壤过氧化氢酶、蔗糖酶活性均显著低于CK；而T2、T3 处理显著提高了土壤脲酶和酸性磷酸酶活性。间作T2 处理与CK 产量无显著性差异；而T1、T3 处理的产量均有降低。T1、T2 处理能有效减轻白粉虱和烟青虫的为害状况，相对防效较好。综上所述，以2 行木薯间作2 行辣椒、辣椒株距为0.5 m 的T2 栽培模式最优，适合作为湖南产区辣椒和木薯的间作模式。

关键词: 关键词：辣椒, 木薯, 间作, 光合性能, 土壤, 产量, 虫害