滇南地区桃树种植模式对土壤有机碳组分及碳库管理指数的影响

Abstract

PDF HTML阅读 XML下载 导出引用 引用提醒 滇南地区桃树种植模式对土壤有机碳组分及碳库管理指数的影响 DOI: 10.5846/stxb202112103508 作者: 作者单位: 作者简介: 通讯作者: 中图分类号: 基金项目: 国家自然科学基金项目（42071127）；云南大学人才项目（C176220100083） Effects of peach tree planting patterns on soil organic carbon fractions and carbon pool management index in southern Yunnan Author: Affiliation: Fund Project: 摘要 | 图/表 | 访问统计 | 参考文献 | 相似文献 | 引证文献 | 资源附件 | 文章评论 摘要:经果林种植可改变土壤质量、改善生态环境，同时具有较高的经济效益。合理的种植模式可通过物种间的互补性提高资源利用效率，改善土壤碳库质量并提高综合效益。为探讨桃树种植模式对土壤有机碳组分及碳库管理指数的影响，以云南省开远市不同桃树种植模式（桃树单种-SP和桃树南瓜套种-PP）为研究对象，以毗邻的天然林地（CK）为对照，分析不同种植模式下活性碳库，即高锰酸钾氧化有机碳（POXC）、颗粒有机碳（POC），惰性有机碳库即矿物结合态有机碳（MAOC）在0-40 cm土层的分布情况，明确土壤有机碳组分与土壤理化性质的关系；计算碳库活度指数（CPAI）、碳库指数（CPI）以及碳库管理指数（CPMI），明确不同桃树种植模式的碳库变化情况。结果表明：桃树种植模式和对照的土壤有机碳组分的含量均随着土层深度的增加而减少，平均土壤有机碳（SOC）含量为：14.68 g/kg （CK）>9.57 g/kg （PP）>8.58 g/kg （SP）。平均活性有机碳组分所占比例与POC/MAOC均表现为：SP>CK>PP，PP的活性有机碳比例较低，具有较高的有机碳稳定性。两种桃树种植模式的CPMI在10-20 cm土层达到最大值；相较于PP，SP具有较高的CPAI （1.10），而PP则具有更高的CPMI （69.51），表明PP的碳库稳定性和土壤碳库质量均优于SP。桃树种植模式、土层深度以及二者的交互作用对土壤有机碳组分及其分配比例存在不同程度的影响。冗余分析结果显示砂粒、pH是影响不同桃树种植模式以及不同土层深度下土壤有机碳组分及土壤有机碳库的主要环境因子。综上，PP是较好的种植模式，有利于有机碳的固存。经果林的种植应根据土壤性质、碳库基本情况和氮磷等养分的有效性等采取适宜的管理措施，增强其固碳效率和碳汇水平。 Abstract:The ecological environment in southern Yunnan is fragile with serious land degradation. Economic orchard, as a major ecological management, has a certain effect on organic carbon sequestration. Reasonable planting patterns can improve resource utilization efficiency through the complementarity between species, increasing the quality of soil carbon pool and obtaining higher comprehensive benefits. This study was carried out on different planting patterns of peach single species (SP) and peach pumpkin interplanting (PP), located in Taoyuan Village, Kaiyuan City, Yunnan Province. Taking the adjacent natural forest (CK) as control, soil organic carbon (SOC), permanganate oxidizable carbon (POXC), particulate organic carbon (POC), and mineral-associated organic carbon (MAOC) were measured in 0-40 cm soil layer at an interval of 10 cm. Meanwhile, we calculated carbon pool activity index (CPAI), carbon pool index (CPI) and carbon pool management index (CPMI). Our objective was to investigate the effects of peach tree planting patterns on the stability of soil organic carbon and CPMI and clarify the relationship between soil organic carbon fractions and soil physicochemical properties. The results showed that the content of soil organic carbon fractions of the peach tree planting patterns and the control decreased with the increase of soil depths, the average SOC content were 14.68 g/kg (CK), 9.57 g/kg (PP), 8.58 g/kg (SP), respectively. The proportion of average POC, POXC and POC/MAOC showed as SP>CK>PP. PP had a lower proportion of active organic carbon with better organic carbon stability. Moreover, the CPMI of both peach tree planting patterns were lower than CK and reached the maximum value in the layer of 10-20 cm. SP had a higher CPAI (1.10), while PP had a higher CPMI (69.51), indicating that the stability and quality of PP soil carbon pool was better than that of SP. SOC, POXC, POC, and MAOC were all significantly positively correlated with sand, C/N, available phosphorus, exchangeable potassium, pH, and total phosphorus (in order of correlation). Peach tree planting patterns, soil depth and their interaction had different effects on soil organic carbon fractions and its proportion. Redundancy analysis also showed that sand and pH were the main environmental factors affecting the soil organic carbon fractions and soil organic carbon pool under different peach tree planting patterns and soil depths. We concluded that peach tree planting patterns changed the SOC and its fractions. Here, we consider PP as a better planting pattern, which is beneficial to organic carbon sequestration. Appropriate management measures should be taken according to the soil properties, basic situation of carbon pool and the effectiveness of nutrients such as nitrogen and phosphorus, so as to enhance the carbon sequestration efficiency and carbon sink level while improving the economic benefits. 参考文献 相似文献 引证文献