关键词: 蔬菜栽培, 有机物料还田, 生物炭, 品质, 矿物结合态有机碳

Abstract:

A pot experiment with sandy loam soil was conducted using a completely randomized block design. The conventional fertilization（CF）as the control. The effects of straw，organic fertilizer，peat，and biochar on vegetable yield，quality，soil organic carbon（SOC），particulate organic carbon（POC），and mineral-associated organic carbon（MAOC）were compared through the rotation of pak choi（Brassica chinensis L.）and spinach（Spinacia oleracea L.）. The results showed that，under equal carbon input conditions，compared with the CF treatment，the biochar treatment increased the yield of pak choi by 47.4%，the soluble sugar content of pak choi by 12.0% and the vitamin C content of spinach by 23.0%. The peat treatment significantly increased the vitamin C content（18.3%）and soluble sugar content（13.0%）of pak choi，as well as the vitamin C content of spinach（35.4%），while significantly reducing the cellulose content of pak choi（27.1%）. After the vegetable rotation finished，compared with the CF treatment，the peat，biochar，and organic fertilizer treatments all significantly increased SOC content by 63.0%，59.8%，and 57.0%，respectively. Their increases in soil POC content were 109.6%，67.7%，and 115.1%，respectively；and their increases in soil MAOC were 12.9%，26.1%，and 39.5%，respectively. The soil MAOC/SOC ratios of the organic fertilizer and peat treatments were below 50%，while that of the biochar treatment was above 50%. The study indicated that applying peat in combination with conventional fertilization can improve vegetable quality and stabilize the soil carbon pool.

Key words: vegetable cultivation, organic material returning, biochar, quality, mineral- associated organic carbon