施用餐厨垃圾调理剂对果园土壤有机碳组分的影响

为研究施用餐厨垃圾调理剂对土壤有机碳组分的影响，以果园土壤为研究对象，从时间、空间维度解析长期施用餐厨垃圾调理剂对土壤有机碳积累、组成及其分布规律的影响，结合CPMI（碳库管理指数）和相关性分析，揭示施用餐厨垃圾调理剂对土壤碳汇的影响机制.结果表明，施用餐厨垃圾调理剂可显著提高土壤中w（TOC）（TOC为总有机碳），并随施用时间的增加逐渐向深层土壤迁移，改善TOC分布状况.随着施用餐厨垃圾调理剂时间的增加，0~20 cm土壤层中w（NOC）（NOC为非活性有机碳）和30~40 cm土壤层中w（AOC）（AOC为活性有机碳）呈增加趋势，AOC分配比例低于NOC分配比例.随着施用时间的增长，0~30 cm土壤层中w（POC）（POC为颗粒有机碳）显著提高，最大值为42.94 mg/g，MOC（矿质结合态有机碳）分配比例与POC分配比例呈相反变化趋势，有利于提高土壤碳稳定性.各土壤层中CPMI均大于空白对照组，最大值为154.437，表明施用餐厨垃圾调理剂有利于提升土壤肥力.相关性分析表明，w（POC）与pH呈负相关，与含水率、EC（电导率）、w（OM）（OM为有机质）呈正相关，其中与含水率相关性最高（R=0.91）.可见，长期施用餐厨垃圾调理剂对提高果园土壤碳汇、改善土壤肥力具有重要意义，研究结果有助于进一步提升土壤碳汇的新型土壤调理剂的研发与应用. 

Effects of Food Waste Soil Conditioner on Organic Carbon Distribution in Orchard Soil

In order to study the influence of long-term application of food waste soil conditioner on soil organic carbon sink, the orchard soil organic carbon accumulation, composition and distribution were analyzed. Under the CPMI (carbon pool management index) and correlation analysis, the mechanisms of soil carbon sink were revealed. The results show that the application of the food waste soil conditioner significantly improved the w(TOC) (TOC represents total organic carbon) and migration of TOC from surface to deep orchard soil. The w(NOC) (NOC represents non-active organic carbon) in the 0-20 cm surface soil and w(AOC) (AOC represents active organic carbon) in the 30-40 cm deep soil increased over time, and distribution proportion of AOC was lower than that of the NOC. With the long-term application of food waste soil conditioner, the w(POC) (POC represents particulate organic carbon) was significantly improved in the 0-30 cm soil, with a maximum of 42.94 mg/g, and the distribution proportion of MOC (mineral-associated organic carbon) and POC showed opposite tendency, indicating that food waste soil conditioner application had the potential to accumulate and stabilize the soil organic carbon. Under food waste soil conditioner application, the CPMI were better than that of the blank group, with a maximum of 154.437, which indicating that food waste soil conditioner application was conducive to improving soil fertility. The correlation analysis observed that the correlation of w(POC) with pH was negative, while the correlations of moisture content, electrical conductivity (EC) and w(OM) (OM represents organic matter) were positive, with the highest correlation with moisture content (R=0.91). Overall, the results indicated that the long-term application of food waste soil conditioner played a critical role in improving orchard soil carbon stability and fertility. This study provides a theoretical basis for the development of new soil conditioners and application on soil carbon sink.