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Effects of grazing intensity on soil labile organic carbon fractions in a desert steppe area in Inner Mongolia

机译：放牧强度对内蒙古荒漠草原区土壤不稳定有机碳组分的影响

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摘要

Grazing can cause changes in soil carbon (C) level. This study aimed to elucidate the response of soil labile organic carbon (SLOC) under four different grazing intensities: non grazing (NG), 0 sheep·ha-1; light grazing (LG), 0.91 sheep·ha-1; moderate grazing (MG), 1.82 sheep·ha-1, and heavy grazing (HG), 2.73 sheep·ha-1. Results showed that there was no significant difference in total soil organic carbon (TOC) and soil inorganic carbon (SIC) content from three soil depths (0-15 cm, 15-30 cm, and 30-45 cm) under different grazing intensities. However, the SLOC including particulate organic carbon (POC), light fraction organic carbon (LFOC), and readily oxidizable carbon (ROC) content at a depth of 0-15 cm decreased with the increasing grazing intensity among LG, MG and HG. The SLOC content at depths of 15-30 cm under the NG and LG were significantly higher than that under the MG and the HG. The TOC and SLOC content decreased with increasing depths of soil horizons, but SIC content increased. The variation trend of the density of different soil carbon fractions and the ratio of individual SLOC fractions to TOC were similar to that of the soil carbon content of corresponding fractions. These results indicated that MG and HG treatments caused C loss at 0-30 cm; and SLOC was more sensitive than TOC in response to different grazing intensities.
机译：放牧会导致土壤碳（C）含量变化。本研究旨在阐明四种不同放牧强度下土壤不稳定有机碳（SLOC）的响应：非放牧（NG），0绵羊·ha -1 ；轻度放牧（LG），0.91羊·ha -1 ；中度放牧（MG），1.82羊·ha -1 ，重度放牧（HG），2.73羊·ha -1 。结果表明，在不同放牧强度下，三种土壤深度（0-15 cm，15-30 cm和30-45 cm）的土壤总有机碳（TOC）和土壤无机碳（SIC）含量均无显着差异。然而，随着LG，MG和HG放牧强度的增加，包括颗粒有机碳（POC），轻质有机碳（LFOC）和易氧化碳（ROC）含量在内的SLOC在0-15 cm深度处降低。 NG和LG下15-30 cm深度的SLOC含量明显高于MG和HG下的SLOC含量。随着土壤层深度的增加，TOC和SLOC含量降低，而SIC含量增加。不同土壤碳组分密度的变化趋势以及各SLOC组分与TOC的比值与相应组分土壤碳含量的变化趋势相似。这些结果表明，MG和HG处理导致0-30 cm处的碳损失； SLOC在不同放牧强度下比TOC更为敏感。

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