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首页> 美国卫生研究院文献>Scientific Reports >Three-decade long fertilization-induced soil organic carbon sequestration depends on edaphic characteristics in six typical croplands
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Three-decade long fertilization-induced soil organic carbon sequestration depends on edaphic characteristics in six typical croplands

机译：三十年来长期施肥引起的土壤有机碳固存取决于六个典型农田的土壤养分特征

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Fertilizations affect soil organic carbon (SOC) content but the relative influences of the edaphic and climate factors on SOC storage are rarely studied across wide spatiotemporal scales. This study synthesized long-term datasets of fertilization experiments in six typical Chinese croplands, and calculated annual C input from crops and manure amendments, changes in SOC storage (ΔSOC) and C sequestration efficiency (i.e. the percentage of soil C change per unit of C input, hereafter referred as CSE) in 0–20 cm soil over three decades. Three fertilization treatments include no fertilization (CK), chemical nitrogen, phosphorus and potassium fertilizers (NPK) and combined chemical fertilizers and manure (NPKM). Results showed significant fertilization effects on C input and ΔSOC (NPKM>NPK>CK), and significantly higher CSE in Qiyang at Hunan than Zhengzhou at Henan and Heihe at Heilongjiang. The variance partitioning analysis (VPA) showed more variance of CSE can be explained by edaphic factors (up to 39.7%) than other factors. Furthermore, soil available N content and pH were identified as the major soil properties explaining CSE variance. This study demonstrated key controls of soil fertility factors on SOC sequestration and informs the need to develop strategic soil management plan to promote soil carbon sequestration under long-term intensive fertilization.
机译：施肥会影响土壤有机碳（SOC）的含量，但在宽广的时空范围内很少研究土壤和气候因素对SOC储量的相对影响。这项研究综合了六个典型中国农田的施肥实验的长期数据集，并计算了作物和粪便改良剂的年碳输入，SOC储量的变化（ΔSOC）和碳固存效率（即每单位C的土壤碳变化百分比）输入，以下简称CSE）在过去30年中在0–20 cm的土壤中。三种施肥方法包括：不施肥（CK），化学氮，磷和钾肥料（NPK）以及化学肥料和肥料的组合（NPKM）。结果表明，施肥对碳输入和ΔSOC（NPKM> NPK> CK）有显着影响，湖南祁阳的CSE显着高于河南的郑州和黑龙江的黑河。方差划分分析（VPA）显示，教育因素（最多39.7％）比其他因素可以解释CSE的更多方差。此外，土壤有效氮含量和pH被确定为解释CSE变化的主要土壤性质。这项研究证明了土壤肥力因子对SOC固存的关键控制，并提示需要制定战略性土壤管理计划，以促进长期密集施肥下的土壤碳固存。

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