黄土丘陵沟壑区植被类型对土壤团聚体及有机碳的影响  

Effects of vegetation types on soil aggregates and organic carbon in loess hills and gullies

作　　者：陈泽清 杨光 吴际[1,2,3] 王子萌 任鸣 任喜珍 闫哲 CHEN Zeqing;YANG Guang;WU Ji;WANG Zimeng;REN Ming;REN Xizhen;YAN Zhe(College of Desert Control Science and Engineering,Inner Mongolia Agricultural University,010018,Hohhot,China;Wind Erosion Key Laboratory of Central and Local Government,Inner Mongolia Agricultural University,010018,Hohhot,China;Inner Mongolia Hangjin Desert Ecological Position Research Station,017400,Ordos,Inner Mongolia,China;Inner Mongolia Chifeng Kalaqin Water Conservancy Bureau,024400,Chifeng,Inner Mongolia,China;Inner Mongolia Autonomous Region Water Conservancy Development Center,010018,Hohhot,China)

机构地区：[1]内蒙古农业大学沙漠治理学院,呼和浩特010018 [2]内蒙古农业大学中央与地方共建风沙物理重点实验室,呼和浩特010018 [3]内蒙古杭锦旗荒漠生态系统国家定位观测研究站,内蒙古鄂尔多斯017400 [4]内蒙古赤峰市喀喇沁旗水利局,内蒙古赤峰024400 [5]内蒙古自治区水利事业发展中心,呼和浩特010018

出　　处：《中国水土保持科学》2025年第2期77-88,共12页Science of Soil and Water Conservation

基　　金：内蒙古自治区科技计划项目“黄土丘陵沟壑区智慧水土保持技术”(2021GG0070);中国水利水电科学研究院内蒙古阴山北麓草原生态水文国家野外科学观测研究站2023年度开放研究基金项目“基于3S技术的阴山北麓草原水土流失过程及驱动机制研究”(YSS202305)。

摘　　要：土壤团聚体及有机碳质量分数对土壤结构稳定性至关重要。目前黄土丘陵沟壑区不同植被恢复类型下二者的变化特征及相关性尚不清晰。以内蒙古黄土丘陵沟壑区圪坨店流域的成熟人工油松林、人工柠条林、人工紫花苜蓿草地土壤为研究对象,以裸地为对照,对0~20、20~40和40~60 cm 3层土壤团聚体进行物理分级,测定土壤团聚体平均质量直径(MWD)、几何平均直径(GMD)、分形维数(D)及土壤有机碳等指标,用Pearson法对各指标进行相关性分析。结果表明:1)不同植被下各土层团聚体均以<0.250 mm团聚体为主,3种植被恢复措施下的≥2.000和<2.000~0.250 mm团聚体质量分数均显著高于裸地(P<0.05),人工油松林下土壤≥0.250 mm团聚体质量分数R>0.25最高;2)相较于裸地,3种植被恢复下土壤的R>0.25,MWD和GMD分别提高44.9%~121.36%,63.11%~171.23%和31.21%~194.95%,D值降低0.18%~3.29%,人工油松林土壤稳定性提升最佳;3)土壤团聚体有机碳质量分数经人工植被恢复提高了3.06%~53.36%,人工油松林下土壤有机碳质量分数提升最高;4)土壤团聚体稳定性与≥0.250 mm粒级团聚体有机碳质量分数显著相关(P<0.05),0.250 mm粒级团聚体为影响土壤团聚化的关键阈值。人工油松林对于提升土壤团聚体稳定性和固碳能力具有显著优势,可有效抵抗土壤侵蚀,适宜在该地区植被恢复工作中推广应用。[Background]Planted Pinus tabuliformis forest,Caragana korshinskii forest,and Medicago sativa grassland are common types of planted vegetation restoration in the loess hill and gully region,with extensive planting history and adaptability.These three vegetation types demonstrate differences in growth habits,root structure,and biomass accumulation,which may lead to varying impacts on soil aggregate stability and organic carbon content.Studying their effects on soil aggregates and organic carbon content may provide a scientific basis for selecting effective vegetation and enhancing soil erosion resistance in the local area.[Methods]Representative planted P.tabuliformis forest,C.korshinskii forest,and M.sativa grasslands were selected as study objects,with bare land set as a control.The study consisted of three treatments,and soil samples were collected at depths of 0-20 cm,20-40 cm,and 40-60 cm following an"S"shaped layout.The samples underwent pretreatment such as air drying and sieving.The Elliot wet sieving method was used to analyze soil aggregate stability,and physicochemical properties such as organic carbon,total nitrogen,bulk density,moisture content,and pH were measured.Finally,statistical software was used for data analysis and graph plotting.[Results]1)Under different vegetations,the aggregates in each soil layer are mainly micro-aggregates of<0.250 mm,and the content of≥2.000 mm and<2.000-0.250 mm diameter aggregates under the three vegetation restoration measures is significantly higher than that of the control(P<0.05),with the highest content of>0.250 mm aggregates(R>0.25)under the planted P.tabulaeformis forest.2)Compared with the control,the R>0.25,MWD,and GMD of the soil under the three vegetation restorations increased by 44.90%-121.36%,63.11%-171.23%,and 31.21%-194.95% respectively,and the D value reduced by 0.18%-3.29%.The planted P.tabulaeformis forest showed the best effect on soil stability improvement.3)After planted vegetation restoration,the organic carbon content in soil aggregates effe

关 键 词：土壤团聚体 人工植被恢复 团聚体稳定性 有机碳 黄土丘陵沟壑区 

分 类 号：S157.2[农业科学—土壤学]