Influence of Intercropping with Different Root Segregation on Soil Nutrients,Extracellular Enzymes and Their Stoichiometric Characteristics of Chinese Cabbage

SUN Xinying; FAN Bowen; ZHAO Liqin; LIU Juncai; DONG Ziming; YANG Fengjun

doi:10.15933/j.cnki.1004-3268.2025.03.012

Abstract：This study investigated the soil nutrient content and extracellular enzyme activities related to soil carbon,nitrogen and phosphorus cycles and their stoichiometric change characteristics under Chinese cabbage and garlic intercropping,so as to provide scientific basis and theoretical support for efficient Chinese cabbage production and sustainable land use.Spring and Autumn Imperial cabbage and Zhaozhou white garlic were used as experimental materials,and four treatments were set up including Chinese cabbage monoculture(CK),Chinese cabbage and garlic plastic film root-separated intercropping(SM),Chinese cabbage and garlic nylon net root-separated intercropping(NW),and Chinese cabbage and garlic non-separated intercropping(BF),to determine the nutrient nature of the soil and the four kinds of extracellular enzyme activities and their stoichiometric ratios,and to calculate the lengths and angles of vectors used for the indication of the resource limitation of microorganisms.The results showed that,compared with CK treatment,BF treatment was able to increase soil organic carbon(SOC),total nitrogen(TN),total phosphorus(TP)and quick-acting phosphorus(AP)contents by 10.51％to 21.21％,24.51％to 266.07％,35.71％to 102.86％,and 18.88％to 154.17％,respectively,and intercropping was able to improve soil nutrient profiles and soil fertility.Compared with CK treatment,NW and BF treatments were able to significantly increase NAG and ALP activities,with NAG enzyme activities increased by 17.54％to 104.58％and 48.04％to 159.05％,respectively,and ALP enzyme activities increased by 9.60％to 31.55％and 20.67％to 48.32％.By calculating enzyme stoichiometric ratios,it was found that CK and SM treatments significantly increased vector length(VL)and angle(VA)compared with NW and BF,and potting soils were mainly limited by microbial carbon and phosphorus.The degree of carbon and phosphorus limitation was slowed down under NW and BF treatments compared to CK treatment.The carbon and phosphorus limitations faced by soil microorganisms are easily exacerbated by monocropping;Chinese cabbage and garlic non-separated intercropping can improve soil nutrient effectiveness,increase soil alkaline phosphatase content,and effectively alleviate microbial resource limitations.