摘要
作为土壤恢复的有效措施,施有机肥和免耕补播深刻影响着黄河流域退化高寒草甸草原土壤团聚体组成、稳定性及生态系统养分循环过程。掌握不同修复措施对退化高寒草甸土壤团聚体组成与稳定性及碳氮磷生态化学计量特征的影响,为认识黄河流域退化高寒草甸植被恢复过程中土壤结构和功能的变化及生态系统恢复与重建提供基础资料。2020年在黄河流域退化高寒草甸设置施有机肥(F)、免耕补播(S)及施有机肥+免耕补播(F+S)3种生态修复措施,并以不经过任何处理的高寒草甸作为对照(CK)。结果表明:与CK相比,S显著提高黏粉粒团聚体含量(P<0.05),F+S显著提高微团聚体含量(P<0.05);S显著降低土壤团聚体平均质量直径(MWD)(P<0.05);F+S显著提高了微团聚体全氮和全磷含量(P<0.05),而S显著降低了微团聚体和黏粉粒团聚体有机碳含量(P<0.05);F和F+S显著增加微团聚体、黏粉粒团聚体碳磷比(P<0.05),S只显著增加中团聚体碳磷比(P<0.05),F、F+S显著增加各粒级团聚体氮磷比(P<0.05)。微团聚体和黏粉粒团聚体有机碳含量对大团聚体含量、黏粉粒团聚体含量、MWD和几何平均直径(GMD)有极显著影响(P<0.01)。综上,施有机肥和免耕补播处理3年后能够有效改善黄河流域退化高寒草甸土壤团聚体特性,优化土壤主要化学性状,其中,施有机肥+免耕补播为最佳修复模式。
Effective restoration measures such as organic fertilizer application and no-tillage reseeding,can significantly influence the composition and stability of soil aggregates and ecosystem nutrient cycling processes in degraded alpine meadows of the Yellow River Basin.In this research,effects of different restoration mea⁃sures on soil aggregate composition,aggregate stability,and carbon,nitrogen,and phosphorus content of soil aggregates and their ecological stoichiometric characteristics were determined to provide fundamental data for understanding changes in soil structure and function during vegetation restoration of degraded alpine meadows in the Yellow River Basin,and to offer essential references for ecosystem restoration and reconstruction.In 2020,three ecological restoration measures,organic fertilizer application(F),no-tillage reseeding(S),and combina⁃tion of organic fertilizer application and no-tillage reseeding(F+S)were conducted in degraded alpine mead⁃ows for a three-year field trial,with untreated meadows serving as controls(CK).Results demonstrated that compared with CK,S significantly increased silt and clay aggregate content(P<0.05),while F+S signifi⁃cantly increased micro-aggregate content(P<0.05).Conversely,S significantly inhibited mean weight diam⁃eter(MWD)(P<0.05).Total nitrogen and phosphorus content in micro-aggregates were increased by F+S(P<0.05),whereas organic carbon contents in micro-aggregates and silt and clay aggregates were reduced by S significantly(P<0.05).For carbon-to-phosphorus ratios,increases were found in micro-aggregates and silt and clay aggregates under F and F+S(P<0.05),while the ratio in meso-aggregates was risen by S(P<0.05).Additionally,nitrogen-to-phosphorus ratios in all aggregate compositions were increased by F and F+S(P<0.05).The organic carbon content in micro-aggregates and silt and clay aggregates significantly affect macro-aggregate and silt and clay aggregate content,MWD,and geometric mean diameter(GMD)(P<0.01).In conclusion,after three years of treatment,the soil aggregate properties and major chemical character⁃istics of degraded alpine meadows in the Yellow River Basin were effectively improved by organic fertilizer application and no-tillage reseeding treatments,with the organic fertilizer application+no-tillage reseeding com⁃bination being considered as the most optimal restoration mode.
作者
汪士为
吴伟
WANG Shiwei;WU Wei(Hubei University of Automotive Technology,Shiyan 442002,China;State Key Laboratory of Water Resources and Hydropower Engineering Science,Wuhan University,Wuhan 430072,China)
出处
《中国草地学报》
北大核心
2025年第7期96-106,共11页
Chinese Journal of Grassland
基金
国家自然科学基金项目(52079093)。
关键词
化学计量特征
土壤团聚体
修复措施
高寒草甸
黄河流域
Stoichiometric characteristics
Soil aggregates
Restoration measures
Alpine meadow
Yellow River Basin
