种植枸杞对次生盐渍化土壤活性有机碳和碳库管理指数的影响

Effects of Medlar Planting on Active Organic Carbon and Carbon Pool Management Index in Secondary Salinized Soil

以次生盐渍化弃耕地为对照,研究种植枸杞对次生盐渍化土壤有机碳、活性有机碳、非活性有机碳及碳库管理指数的影响。结果表明：与弃耕地相比,4 a、7 a、11 a枸杞地0~100 cm土壤有机碳分别增加41.6%、46.5%、51.1%,活性有机碳分别增加57.1%、57.9%、54.4%,非活性有机碳分别增加24.0%、33.2%、47.3%,增加量在0~10 cm和60~80 cm土层最为明显;次生盐渍化土地种植枸杞后碳库活度和碳库活度指数有所增加,碳库指数和碳库管理指数明显增加,土壤质量得到改善。土壤总有机碳、活性有机碳、非活性有机碳和碳库指数与土壤肥力提高、含盐量和p H的降低密切相关,可作为表征次生盐渍化土壤质量改善的指标。

This study explored effects of medlar planting on contents of total organic carbon（ TOC）,active organic carbon（ AOC）,non active organic carbon（ NAOC）,and carbon pool management index（ CPMI） in secondary salinized soil and compared those contents against what in abandoned salinized agricultural land. The result showed that the contents of TOC,AOC,and NAOC increased by 41. 6%,46. 5% and 51. 1%; 57. 1%,57. 9%,and54. 4%; and 24. 0% and 33. 2%,47. 3%,respectively in the soil depth of 0- 100 cm after medlar planting for4,7 and 11 years. The largest increases appeared at the soil depths of 0- 10 cm and 60- 80 cm. Carbon pool activity and carbon pool activity index had a little increase,carbon pool index（ CPI） and CPMI were significantly increased after medlar planting in secondary salinized soil. The soil quality was improved effectively. Correlation analysis showed that the soil fertility improvement and the decrease of soil salinization were closely related to TOC,AOC,NAOC and CPI. The four indices could be used as the indicators to reflect the soil quality improvement of secondary salinized soil.