多成分草地的嫩枝和根的生物量及其对富含石块的阿伦诺斯土壤碳积累的影响

Land Pub Date : 2024-07-20 DOI:10.3390/land13071098
L. Tripolskaja, M. Toleikienė, Aida Skersiene, Agnė Veršulienė
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摘要

为防止轻质土壤退化,建议将其用于草地。这些土壤管理系统有助于加快土壤有机碳(SOC)的积累,从而改善土壤性质,减少农业用地的碳排放。在这项实验中,我们研究了多成分多年生草根在阿伦诺索尔剖面中的分布及其对温带气候区 SOC 固碳的影响。我们的研究旨在确定 0-15 厘米、15-30 厘米和 30-50 厘米深处根系生物量的差异,并评估它们与土壤中 SOC 和溶解有机碳 (DOC) 的相关性。我们连续两年在草地开花期和最后收割后采集了施肥草地和未施肥草地的根、芽和土壤样本。我们的研究结果表明,在富含石块的沙壤土 Arenosol 中,0-50 厘米的土壤深度积累了 12.4-15.9 兆克/公顷的根系生物量。施用氮磷钾肥料对草根生物量的影响不大,但对草芽生物量的影响很大。大部分根系(84-88%)集中在 0-15 厘米土层。多年生禾本科植物的根部平均储存了 5.10-6.62 兆克/公顷-1 的有机碳(OC),位于 0-50 厘米的土壤深度内。我们发现,0-50 厘米土层中的 SOC 含量与相应土层根部积累的碳的相关性(r = 0.62,p < 0.001)比与嫩枝生物量的相关性(r = 0.41,p = 0.04)更强。然而,在 DOC 与嫩枝生物量(r = 0.68,p < 0.001)以及 DOC 与残留物生物量(r = 0.71,p < 0.001)之间发现了明显的相关性,这解释了 30-50 厘米土层中 DOC 显著增加的原因,并表明使用肥料后,土壤有机质(SOM)的移动物质从地上生物量中沥滤出来。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Biomass of Shoots and Roots of Multicomponent Grasslands and Their Impact on Soil Carbon Accumulation in Arenosol Rich in Stones
To prevent the degradation of light-textured soils, it is advisable to use them for grasslands. These soil management systems help with the faster accumulation of soil organic carbon (SOC), thereby improving the soil’s properties and reducing carbon emissions from agricultural land. In this experiment, we studied the distribution of multi-component perennial grass roots in the Arenosol profile and their impact on SOC sequestration in temperate climate zones. Our research aimed to identify differences in root biomass at depths of 0–15 cm, 15–30 cm, and 30–50 cm and to assess their correlation with SOC and dissolved organic carbon (DOC) in the soil. The roots, shoots, and soil samples of fertilized and unfertilized grasslands were collected at the flowering stage and after the final grass harvest two years in a row. Our findings revealed that, in sandy loam Arenosol rich in stones, 12.4–15.9 Mg ha−1 of root biomass was accumulated at 0–50 cm of soil depth. The application of NPK fertilizers did not significantly affect grass root biomass, but significantly affected shoot biomass. Most roots (84–88%) were concentrated in the 0–15 cm layer. On average, 5.10–6.62 Mg ha−1 of organic carbon (OC) was stored in the roots of perennial grasses within 0–50 cm of soil depth. We found that the SOC content in the 0–50 cm soil layer correlated more strongly (r = 0.62, p < 0.001) with C accumulated in the roots of the corresponding layer than with shoot biomass (r = 0.41, p = 0.04). However, a significant correlation was found between DOC and shoot biomass (r = 0.68, p < 0.001) and between DOC and the biomass of residues (r = 0.71, p < 0.001), explaining the significant increase in DOC in the 30–50 cm soil layer and indicating the leaching of mobile soil organic matter (SOM) substances from the above-ground biomass using fertilizers.
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