Abstract

Estimates of the spatial heterogeneity of the organic matter distribution in forest soils determined by the influence of the species and spatial structure of phytocenoses are relevant for many environmental problems, including the calculation of carbon sinks and modeling of the dynamics of forest ecosystems. We analyzed the data on the organic carbon (C_org) and total nitrogen (N_tot) contents in the O (forest litter) and AY (humus) horizons of Entic Podzols in the Prioksko-Terrasnyi Reserve (54.89° N, 37.56° E). The studied site is located in a coniferous–deciduous forest formed after overgrowing of the cutting area of pine stands. We sampled the O and AY horizons along transects between trees of different species, i.e., near the trunks, under the crown, and in the intercrown space. The contents of C_org and N_tot in the O horizon varied within 17.6–44.9 and 0.84–1.79%, respectively. The ranges for the AY horizon were greater: 0.71–8.5% (C_org) and 0.035–0.33% (N_tot). The relationship between the contents of C_org and N_tot in the O and AY horizons was close to linear (r_s = 0.72 and r_s = 0.96, respectively). We also obtained similar C : N ratios for the both horizons. The litter thickness and the content of N_tot in the O horizon, as well as the content of C_org in the AY horizon, significantly differed in different parts of the transects (P < 0.05). The differences in the litter thickness and the C_org content in the O horizon under the crowns of different tree species were also significant. In samples from the AY horizon taken in intercrown spaces, the N_tot content correlated with the demand of plant species of the ground cover for soil fertility. The data obtained reflect the influence of specific features of spatial patterns of surface and root litterfall in multispecies communities of mixed forest stands on the spatial variability of C_org and N_tot contents in soil.

中文翻译：

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Prioksko-Terrasnyi保护区的昆虫足动物中有机质和氮的空间分布及其与森林植物群落结构的关系

摘要

由植物碳素的物种和空间结构的影响确定的森林土壤有机质分布的空间异质性估计与许多环境问题有关，包括碳汇的计算和森林生态系统动力学的建模。我们分析了有机碳（C _org）和总氮（N _tot）在Prioksko-Terrasnyi保护区（54.89°N，37.56°E）的Entic Podzols的O（森林凋落物）和AY（腐殖质）层中的含量。所研究的地点位于松林砍伐面积过度生长后形成的针叶-落叶林中。我们沿不同物种的树木之间的样线（即树干附近，树冠下和冠间空间）沿样带采样了O和AY层。O层中C _org和N _tot的含量分别在17.6–44.9和0.84–1.79％之间变化。AY范围的范围更大：0.71-8.5％（C _org）和0.035-0.33％（N _tot）。C _org的含量与N _tot的关系在O和AY地平线上的线性接近（r _s = 0.72和r _s = 0.96）。我们还获得了两个水平的相似的C：N比。在样带的不同部位，O层的凋落物厚度和N _tot含量以及AY层的C _org含量差异显着（P <0.05）。在不同树种的树冠下，O层凋落物厚度和C _org含量的差异也很显着。在从AY地平线采集的冠间空间样本中，N _tot含量与地被植物对土壤肥力的需求相关。所获得的数据反映了混交林多物种群落表层和根凋落物空间格局的特定特征对土壤中C _org和N _tot含量的空间变异性的影响。