大兴安岭呼玛河流域多年冻土区森林土壤有机碳和有效氮分布特征及影响因素
郑智超, 满浩然, 臧淑英, 刘超, 董星丰

Distribution characteristics and influencing factors of forest soil organic carbon and available nitrogen in permafrost regions of Huma River basin, Greater Hinggan Mountains
Zhichao ZHENG, Haoran MAN, Shuying ZANG, Chao LIU, Xingfeng DONG
图3 基于结构方程模型的土壤有机碳、有效氮的影响因素分析[单个箭头表示一个变量被假定为原因,对另一个变量的直接影响;箭头上的数字为标准化路径系数,其中红色箭头为正向影响(P<0.05),蓝色箭头为负向影响(P<0.05);矩形内R2为模型解释的方差;缩写词包括海拔(EL)、土壤深度(SD)、年均气温(MAT)、年均降水量(MAP)、冻土区类型(PT)、植被类型(VT)、土壤有机碳(SOC)、铵态氮(NH4+-N)和硝态氮(NO3--N)]
Fig. 3 Analysis of influencing factors of soil organic carbon and available nitrogen based on structural equation model (SEM)[A single arrow indicates the direct effect of a variable assumed to be a cause on another variable assumed to be an effect; numbers on arrows are standardized path coefficients, red arrows are positive effects (P<0.05), blue arrows are negative effects (P<0.05); percentages in inside on rectangles indicate the variance explained by the model (R2); abbreviations include elevation (EL), soil depth (SD), mean annual temperature (MAT), mean annual precipitation (MAP), permafrost zone type (PT), vegetation types (VT), soil organic carbon (SOC), ammonium nitrogen (NH4+-N) and nitrate nitrogen (NO3--N)]