水土保持通报2025，Vol.45Issue(6)：23-32,10.DOI:10.13961/j.cnki.stbctb.2025.06.025
燕麦生物沙障对青海湖流域沙地土壤碳氮磷含量的影响
Effects of Avena sativa biological sand barriers on soil carbon,nitrogen,and phosphorus contents in alpine sandy land of Qinghai Lake basin
摘要
Abstract
[Objective]The soil improvement potential of oat(Avena sativa)biological sand barriers in the restoration of alpine sandy land were evaluated in order to clarify their regulatory mechanisms on soil carbon(C),nitrogen(N),and phosphorus(P)nutrients and their ecological stoichiometric characteristics during a two-year planting period,and provide theoretical and practical guidance for the ecological restoration of desertified grassland in alpine regions.[Methods]Typical alpine mobile sand dunes in Qinghai Lake basin were selected as the study area,where oat biological sand barrier plots were established.Soil samples were collected at four key time points over a two-year continuous growing period:before sowing(T1),at the end of the first growing season(T2),at the beginning of the second growing season(T3),and at the end of the second growing season(T4).Soil carbon,nitrogen,phosphorus contents and their ecological stoichiometric characteristics were determined at different growth stages.[Results]The oat biological sand barriers significantly increased the soil organic carbon(SOC)and total nitrogen(TN)contents in the surface soil(0-20 cm),while the increase in total phosphorus(TP)was relatively slow.In the T4 period,the SOC and TN in the surface soil increased by approximately 18.2%and 29.3%,respectively,compared to the T1 period,and the SOC and TN in the deep soil(20-40 cm)increased by 56.8%and 27.0%,respectively.The available nitrogen(AN)and available phosphorus(AP)contents in the surface soil increased by 19.8%and 72.7%,respectively,in T4 compared to T1,while soil pH value decreased by approximately 15.0%.With increasing planting duration,the C/N and C/P ratios showed a trend of first increasing and then decreasing,while the N/P ratio showed a gradually increasing trend.Mantel test results indicated that SOC,TN,TP,and pH value were the main factors influencing the stoichiometric characteristics.[Conclusion]The oat biological sand barriers effectively enhance soil organic matter level and nutrient supply,promoting the cycling of elements.Additionally,they optimize the ecological stoichiometric structure of C,N,and P,alleviate nutrient limitations,and enhance soil ecological functions.Furthermore,the restoration benefits accumulate progressively over the two-year planting period,demonstrating potential for long-term soil quality restoration.关键词
燕麦/高寒沙地/土壤碳氮磷/生物沙障/生态化学计量特征Key words
Avena sativa/alpine sandy land/soil carbon,nitrogen,and phosphorus/biological sand barri-ers/ecological stoichiometric characteristics分类
农业科技引用本文复制引用
Li Jiyun,Wang Qian,He Keyan,Wang Jiahao,Wei Xiaoxing..燕麦生物沙障对青海湖流域沙地土壤碳氮磷含量的影响[J].水土保持通报,2025,45(6):23-32,10.基金项目
青海省科技厅—青海省中央引导地方科技发展资金项目"青海湖流域高寒沙地综合治理技术集成与示范"(2024ZY034) （2024ZY034）
