生态科学2025，Vol.44Issue(5)：231-240,10.DOI:10.14108/j.cnki.1008-8873.2025.05.022
兰州南山土壤碳氮对土地利用方式转变的响应
Response of soil carbon and nitrogen to land use change in the Southern mountain of Lanzhou City
摘要
Abstract
Land use changes significantly affect soil carbon and nitrogen cycles.This study investigated the impacts of converting grassland to afforested land following grassland retirement in the southern mountains of Lanzhou(1800-2100 m),located at the western edge of the Loess Plateau,using natural grassland as a control.We focused on changes in soil organic carbon(SOC)and soil total nitrogen(STN)under the two land-use types.The results showed that SOC did not differ significantly between grassland(12.83 g·kg-1)and afforested land(12.00 g·kg-1),whereas STN differed significantly(1.29 g·kg-1,0.62 g·kg-1).Vertically,SOC exhibited surface accumulation,while STN did not follow this pattern.In the mid-elevation range,grassland SOC(12.14 g·kg-1)in the 15-30 cm soil layer was significantly higher than that in afforested land(9.38 g·kg-1).In contrast,at high elevations,the opposite pattern was observed in the 0-15 cm layer.With the exception of the high-elevation 0-15 cm layer,STN was significantly higher in grassland than in afforested land across all elevations.Soil water content(SWC)and soil total phosphorus(STP)were identified as the main factors influencing SOC and STN under both land-use types,with elevation also playing an interactive role.These findings suggest that the conversion from grassland to forest in the study area has not enhanced carbon and nitrogen sequestration.Therefore,careful consideration is needed when implementing grassland to afforested land measures.关键词
兰州南山/土地利用方式转变/退草还林/土壤有机碳/土壤总氮Key words
the Southern mountain of Lanzhou City/change of land use pattern/returning the grassland to the afforested/soil organic carbon/soil total nitrogen分类
农业科技引用本文复制引用
李育梅,崔家宝,王风初,曹建军,朱恭,王继伟..兰州南山土壤碳氮对土地利用方式转变的响应[J].生态科学,2025,44(5):231-240,10.基金项目
甘肃省科技计划资助(23ZDKA017) （23ZDKA017）
兰州市科技计划项目(2024-3-91) （2024-3-91）
