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基于在3个取样尺度(4、2、1 m)对庞泉沟自然保护区的落叶松人工林(L_arix principis-rupprechtii)土壤呼吸速率(Rs)以及生物和非生物因子的观测数据,对不同取样尺度Rs的空间变异性进行了研究,分析了不同取样尺度下5、10和15 cm深度的土壤温度(T_5、T_(10)、T_(15))、10 cm深度的土壤水分(Ws)、土壤全氮(N)、全碳(C)、碳氮比(C/N)、全硫(S)、凋落物量(L_w)和凋落物含水量(L_m)对Rs空间变异的影响,并计算了3种尺度各变量在不同置信水平与估计精度下的最佳采样数量.结果表明,1除4 m取样尺度的C/N比、2 m的Ws和1 m的T_10、T_15的空间变异属于弱变异外,Rs及其它相关因子的空间变异均属于中等变异;Rs、C/N比和S的变异系数随着取样尺度的增大而减小,N、C、Ws、T_5、T__(10)、T__(15)、L_w和L_m则相反.2随着取样尺度的减小,Rs、Ws、T_5、T_(10)、T_(15)、L_w和L_m的空间自相关性减弱,而C、N和C/N比的空间自相关性增强,S则随着取样间距的减小空间自相关性先减弱后增强.3不同取样尺度下影响Rs空间变异的关键因子不同,在较大的尺度上土壤温度是影响Rs空间变异性的主要因素,而在较小的尺度上则受C、L_m和L_w的共同影响.4随着置信水平和估计精度的减低,R_s及其影响因子的合理取样数目逐渐减少;Rs、C/N比和S的取样数目随着取样间距的减小而增加,而N、C、Ws、T_5、T_(10)、T_(15)、L_w和L_m的取样数量则减少.
Based on the observed data of soil respiration rate (Rs) and biotic and abiotic factors of L_arix principis-rupprechtii at 3 sampling scales (4, 2 and 1 m) in Pangquangou Nature Reserve, The spatial variability of sampling scale Rs was studied. The effects of soil temperature (T5, T10, T15) and depth of soil water (Ws) at depths of 5, 10 and 15 cm on different sampling scales were analyzed. , Soil total nitrogen (N), total carbon (C), C / N, total sulfur (S), litterfall (L_w) and litter moisture content (L_m) on spatial variability of Rs The best sampling numbers for each of the three scales were calculated under different confidence levels and estimated accuracy.The results showed that the spatial variability of spatial distributions of C_N at 1 m sampling interval and C_N ratio of 2 m at 1 m and T_10 at 1 m The variation of Rs, C / N ratio and S decreased with the increase of sampling scale. N, C, Ws, T_5, T_ ( 10, T __ (15), L_w and L_m are the opposite.2 As the sampling scale decreases, the spatial autocorrelation of Rs, Ws, T_5, T_ (10), T_ (15), L_w and L_m decreases, C, N and C / N ratio of empty The autocorrelation increases, and the spatial autocorrelation of S decreases first and then increases with decreasing sampling spacing.3 The key factors affecting the spatial variation of Rs at different sampling scales are different, and on a larger scale the soil temperature affects the Rs space The main factor of variability is the co-influence of C, L_m and L_w on a smaller scale.4 As the confidence level and estimation accuracy decrease, the number of reasonable samples of R_s and its impact factor decreases gradually. Rs, C The number of samples / N and S increases with decreasing sampling interval while the number of samples N, C, Ws, T_5, T_ (10), T_ (15), L_w and L_m decreases.