为探讨铁基生物炭配施甲壳素对三七连作土壤理化性质及酶活性的影响，试验共设4个处理（T1 ~ T4）和1个对照（CK）.结果表明，T3和T4处理土壤电导率分别比CK提高了71.42%和78.57%.T4处理土壤总氮质量分数明显提高.培养第15天后，T4处理土壤蔗糖酶活性较CK提高了6.17%；T1、T4处理土壤蛋白酶与脲酶活性分别较CK提高了11.33%和19.08%；T3处理三七叶片超氧化物歧化酶和过氧化物酶活性最高.培养第30天后，土壤中3种酶活性较第15天均有不同程度降低.相关性分析发现，蔗糖酶与硝态氮之间呈极显著正相关，脲酶与pH之间呈显著负相关，蔗糖酶和超氧化物歧化酶与土壤有机碳之间显著负相关，超氧化物歧化酶与土壤全氮呈显著负相关.PCA分析表明，T3处理土壤理化性质与酶活性的关系与其他处理有所差异.

This study aims to investigate the effects of iron-based biochar combined with chitin on the physico-chemical properties and enzyme activities of soils under continuous cropping of Panax notoginseng. The experiment included four treatments（T1 ~ T4） and one Control（CK）. The results showed that the soil electrical conductivity in T3 and T4 treatments was increased by 71.42% and 78.57%， respectively， compared with CK. The total nitrogen content in the soil significantly increased in the T4 treatment. After 15 days of cultivation， the soil sucrase activity in the T4 treatment increased by 6.17% compared to CK； the protease and urease activities in the T1 and T4 treatments increased by 11.33% and 19.08% respectively， compared with CK. The activities of superoxide dismutase and peroxidase in Panax notoginseng leaves in T3 treatment were highest. After 30 days of cultivation， the activities of the three enzymes in the soil decreased to varying degrees compared with those after 15 days. Correlation analysis showed that there was a very significant positive correlation between invertase and nitrate nitrogen， a significant negative correlation between urease and pH， and a significant negative correlation between sucrase and superoxide dismutase and soil， a significant negative correlation between organic carbon， and a significant negative correlation between superoxide dismutase and total soil nitrogen. PCA analysis indicated that the relationship between soil physicochemical properties and enzyme activities in the T3 treatment differed from those in other treatments.