退化荒漠草地恢复对土壤有机碳及其驱动因子的影响  

Effects of the degraded desert grassland restoration on soil organic carbon and its driving factors

作　　者：安立伟[1,2] 李志刚 AN Liwei;LI Zhigang(College of Agriculture,Inner Mongolia Minzu University,Tongliao 028000,China;Key Laboratory of Horqin Sandy Land Ecological Agriculture of the State Ethnic Affairs Commission,Tongliao 028000,China)

机构地区：[1]内蒙古民族大学农学院,通辽028000 [2]科尔沁沙地生态农业国家民委重点实验室,通辽028000

出　　处：《生态学报》2024年第13期5519-5531,共13页Acta Ecologica Sinica

基　　金：内蒙古民族大学教研项目(XNK2023001)。

摘　　要：揭示中国北方退化荒漠草地土壤有机碳分布积累对草地恢复的响应规律和驱动机制,可为科学治理退化草地、阐明草地恢复的土壤碳汇效应提供科学依据。以鄂尔多斯高原不同恢复阶段(流动沙地、恢复前期、恢复中期和恢复后期)的退化草地为研究对象,分析了0—10 cm,10—20 cm和20—40 cm的土壤有机碳对草地恢复的响应,并采用多种统计方法分析土壤有机碳的驱动因素。结果表明:(1)草地恢复显著增加了不同深度的土壤有机碳(P<0.05),恢复后期可使0—10 cm、10—20 cm和20—40 cm土壤有机碳分别增加8.28倍、6.44倍和9.46倍。(2)不同深度土壤有机碳的驱动因素不同:植被盖度和植物多样性共同控制0—10cm土壤有机碳的积累,而下层土壤(10—20 cm和20—40 cm)有机碳积累受到养分限制(土壤氮素)的影响,并且这种影响会随着土壤深度的增加而加强。研究结果可为合理恢复退化草地提供理论依据,同时还为通过草地恢复促进土壤碳循环以实现双碳目标提供了证据。Uncovering the patterns and underlying drivers of soil organic carbon(SOC) accumulation in response to restoration of degraded desert grasslands of Northern China can provide a scientific evidence for the effective management of degraded grasslands and the elucidation of soil carbon sequestration effects through grassland restoration.This investigation focused on the response of SOC to different stages of grassland restoration across the Ordos Plateau,which included areas of shifting sands,pre-restoration,mid-restoration,and post-restoration,at soil depths of 0—10 cm,10—20 cm,and 20—40 cm.To unravel the factors influencing SOC,a suite of statistical techniques was employed.The results indicated that:(1) Grassland restoration significantly increased SOC across all studied depths(P< 0.05).Notably,SOC increased by 8.28 times,6.44 times,and 9.46 times at 0—10 cm,10—20 cm,and 20—40 cm soil depths,respectively.(2) The accumulation of SOC at different depths was found to be influenced by various factors.Vegetation coverage and plant diversity were identified as the primary drivers of SOC accumulation at the 0—10 cm depth,while nutrient limitation,specifically soil nitrogen,played a significant role in the accumulation of SOC in deeper layers(10—20 cm and 20—40 cm),and this effect intensified with increasing soil depth.These findings offer a scientific foundation for informed restoration strategies of the degraded grasslands and furnish evidence for the promotion of soil carbon cycling through grassland restoration,contributing to the achievement of dual carbon goals.

关 键 词：荒漠草地 多样性 土壤有机碳 恢复 驱动因子 

分 类 号：S812.2[农业科学—草业科学]