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首页> 外文会议>Molecular environmental soil science at the interfaces in the earth's critical zone >Effect of Long-term Fertilization on the Sequestration Rate of Physical Fractions of Organic Carbon in Red Soil of Southern China
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Effect of Long-term Fertilization on the Sequestration Rate of Physical Fractions of Organic Carbon in Red Soil of Southern China

机译：长期施肥对南方红壤有机碳固结速率的影响

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Typical red soil samples were collected from 17 years long-term fertilization experiments in Qiyang county of southern China. Physical fractions of the red soil include free particulate organic carbon (fPOC), intra-microaggregate particulate organic carbon (iPOC) and mineral associated organic carbon (MOC), were measured and the effects of fertilization on changes of soil organic carbon (SOC) stocks were analyzed. The results indicated that application of manure and manure-mixed-chemical fertilizer (M, NPKM, 1.5NPKM) significantly enhanced SOC and changed its physical fraction distribution. The highest sequestration rate in fPOC (290.6-408.3 kg·ha-1·yr-1), iPOC (162.0～179.2 kg·ha-1·yr-1) and MOC (322.9～514.5 kg·ha-1·yr-1) were observed in these treatments. However, the content of iPOC and MOC didn't increase in unbalanced chemical fertilizer application treatments (NP, N) in red soil, and they maintained lower sOC sequestration rate. The percentage of sOC sequestration distribution in different physical fractions under balanced fertilization treatments (NPK) followed the order: MOC (45.2%-62.7%)>fPOC (21.9%-35.2%)> iPOC (15.1%-20.0%). The highest percentage of MOC implied that SOC associated silt and clay were the primary mechanism of SOC sequestration in red soil.
机译：典型的红壤样品是从中国南方的祁阳县17年的长期施肥实验中收集的。红壤的物理部分包括游离的颗粒有机碳（fPOC），微团聚颗粒内部的有机碳（iPOC）和矿物相关的有机碳（MOC），并进行了测量，并研究了施肥对土壤有机碳（SOC）储量变化的影响被分析。结果表明，施用肥料和肥料混合化学肥料（M，NPKM，1.5NPKM）可显着提高SOC，并改变其物理分数分布。 fPOC（290.6-408.3 kg·ha-1·yr-1），iPOC（162.0〜179.2 kg·ha-1·yr-1）和MOC（322.9〜514.5 kg·ha-1·yr-）的最高螯合率1）在这些治疗中观察到。然而，在红壤中不平衡施用化肥（NP，N）时，iPOC和MOC的含量没有增加，它们的sOC固存率较低。平衡施肥（NPK）下不同物理组分中sOC的固存分布百分比遵循以下顺序：MOC（45.2％-62.7％）> fPOC（21.9％-35.2％）> iPOC（15.1％-20.0％）。 MOC的最高百分比表明，SOC相关的粉砂和粘土是红壤中SOC隔离的主要机理。

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