中国宁夏南部山区不同恢复年限森林土壤养分及有机碳组分变化。
Changes of soil nutrients and organic carbon fractions in forests with different restoration years in mountainous areas of southern Ningxia, China.
机构信息
College of Soil and Water Conservation Science and Engineering, Northwest A&F University, Yangling 712100, Shaanxi, China.
College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, Shaanxi, China.
出版信息
Ying Yong Sheng Tai Xue Bao. 2024 Mar 18;35(3):639-647. doi: 10.13287/j.1001-9332.202403.018.
Vegetation restoration can effectively enhance soil quality and soil organic carbon (SOC) sequestration. In this study, the distribution characteristics of soil nutrients and SOC along soil profile (0-100 cm), and their responses to restoration years (16, 28, 38 years) were studied in plantations in the southern mountainous area of Ningxia, compared with cropland and natural grassland. The results showed that: 1) the contents of SOC, soil total nitrogen (TN), total phosphorus (TP), particulate organic carbon (POC), mineral-associated organic carbon (MAOC) and the proportion of particulate organic carbon to total organic carbon (POC/SOC) all decreased with increasing soil depth. The ratio of mineral-associated organic carbon to total organic carbon (MAOC/SOC) exhibited an opposite trend. 2) The contents of SOC, TN, TP, C:P, N:P, POC and MAOC gra-dually decreased as the restoration years increased. However, the C:N ratio showed no significant change. The POC/SOC ratio initially increased and then decreased, while the MAOC/SOC ratio decreased initially and then increased. 3) In three different types of vegetation, POC, MAOC, and SOC showed a highly significant positive linear correlation, with the increase in SOC mainly depended on the increase in MAOC. The SOC, TN, TP, POC and MAOC contents in natural grassland and plantations were significantly higher than those in cropland. In conclusion, soil nutrients and POC and MAOC contents of plantations gradually decreased with the increases in restoration years. However, when compared with cropland, natural grassland and plantations demonstrated a greater capacity to maintain and enhance soil nutrient and carbon storage.
植被恢复可以有效提高土壤质量和土壤有机碳（SOC）固存。本研究比较了宁夏南部山区人工林、耕地和天然草地沿土壤剖面（0-100cm）的土壤养分和 SOC 的分布特征及其对恢复年限（16、28、38 年）的响应。结果表明：1）SOC、土壤全氮（TN）、全磷（TP）、颗粒有机碳（POC）、矿物结合有机碳（MAOC）和颗粒有机碳与总有机碳的比例（POC/SOC）随土壤深度的增加而降低。矿物结合有机碳与总有机碳的比例（MAOC/SOC）呈相反趋势。2）随着恢复年限的增加，SOC、TN、TP、C:P、N:P、POC 和 MAOC 的含量逐渐降低。然而，C:N 比没有明显变化。POC/SOC 比先增加后减少，而 MAOC/SOC 比先减少后增加。3）在三种不同类型的植被中，POC、MAOC 和 SOC 呈高度显著的正线性相关，SOC 的增加主要取决于 MAOC 的增加。天然草地和人工林的 SOC、TN、TP、POC 和 MAOC 含量明显高于耕地。总之，随着恢复年限的增加，人工林的土壤养分和 POC、MAOC 含量逐渐降低。然而，与耕地相比，天然草地和人工林具有更大的维持和增强土壤养分和碳储存的能力。
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