Response Mechanism of Soil Carbon Pool to Soil Nutrients in Jujube Orchard with Different Cultivation Years
Yuyang Zhang | Xiangyu Li | Xiaofeng Zhou | Bianhui Duan | Cuiyun Wu | Shaungquan Jing
The organic carbon pool in the field is one of the important carbon pools in the ecosystem. This study explored the changes in soil organic carbon fractions and their influencing mechanisms under different cultivation years of jujube trees in the sandy area. This study measured the bulk density, total porosity, water content, pH, salt content, organic matter, major elements, trace elements, and organic carbon fractions of soil in jujube orchards with cultivation years of 2 years, 4 years, 6 years, 8 years, and 10 years, and analyzed the influencing mechanism of physical and chemical properties on soil organic carbon fractions through structural equation modeling. The results showed that soil physical properties were beneficial to plant growth with the increase in limited planting years. Nitrogen, phosphorus, potassium, and other elements were highest in different soil layers in 6–8 years, and then their contents gradually decreased. Soil organic carbon content increased with the increase in different cultivation years and then remained in a stable state. In different soil layers, soil organic carbon is mainly affected by the active soil organic carbon pool (ASCP). The results of this study aim to explore the effect of vegetation on soil improvement in sandy areas and provide theoretical reference for soil restoration and improvement of the organic carbon pool of sandy soil in southern Xinjiang.
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