高原农业2025，Vol.9Issue(6)：756-766,11.DOI:10.19707/j.cnki.jpa.2025.06.009
高寒土细沟侵蚀中有机碳迁移影响因素及预测模型构建
The Influencing Factors and Prediction Model Construction of Organic Carbon Transfer in Rill Erosion of Alpine Soil
摘要
Abstract
In order to explore the influencing factors of organic carbon transfer(Msoc)in rill erosion in alpine soil and to construct an organic carbon migration model that conforms to regional erosion characteristics,this study selected four factors that affect soil erosion:gravel cover degree,slope length,slope,and flow rate(Rc,L,S,Q).A full factorial design method was used to conduct runoff erosion experiments.The main results were as follow:(1)Msoc varies parabolically with Rc,and there was a positive correlation between Msoc and Rc when Rc below the critical value,and a negative correlation between Rc and Msoc above the critical value,with a critical value of around 45%;Msoc increased with S,and the rate of increase gradually decreased.L and Q had a small impact on Msoc.(2)The sensitivity and contribution rate of the factors to Msoc were consistent,with Rc(68.69%)>S(18.97%)>Q(6.00%)>S×Q(2.09%)>Rc×S(2.08%)>Rc×Q(1.18%)>L(0.91%).The interactions of Rc×L,S×L,and L×Q had no significant effect on Msoc(P>0.05).(3)Rc,S,and Q had a cumulative contribution rate of 93.66%to Msoc,which can explain most of the Msoc variation.A redictive model for Msoc was established based on these three factors:Msoc=0.6 231Rc+1.998 S+6.885 Q-0.006 849 Rc2-0.06 073 S2-1.108 Q2.The model was tested with measured values,and the R2 value was 0.8 352,the NSE value was 0.722 545,and the P-value of the Mann-Whitney test was 0.724,which indicated that the model was basically applicable and achieve high prediction accuracy.Compared with the various test indicators of the full factor model,some factor models had fewer independent variables,simpler equations,and basically no decrease in accuracy.They had a high explanatory power for the dependent variables,making them more suitable for predicting Msoc in the southeast of Tibet,where information acquisition was difficult and the environment was complex.关键词
高寒土/砾石覆盖/全因子试验/径流冲刷/有机碳流失/模型Key words
Alpine soil/Gravel cover/Full factorial design of experiment/Runoff erosion/Organic carbon loss/Model分类
农业科技引用本文复制引用
周金龙,梁万栋,陈松焱,高鑫,喻武,高志康..高寒土细沟侵蚀中有机碳迁移影响因素及预测模型构建[J].高原农业,2025,9(6):756-766,11.基金项目
国家自然科学基金(32060370),藏东南冻融水力侵蚀交错带砾石空间分布格局及土壤侵蚀影响机制 （32060370）
西藏农牧大学质量工程项目(710030007),水土保持专业人才培养模式探索. （710030007）
