• ISSN 1008-505X
  • CN 11-3996/S
蔡岸冬, 徐明岗, 张文菊, 王伯仁, 蔡泽江. 土壤有机碳储量与外源碳输入量关系的建立与验证[J]. 植物营养与肥料学报, 2020, 26(5): 934-941. DOI: 10.11674/zwyf.19287
引用本文: 蔡岸冬, 徐明岗, 张文菊, 王伯仁, 蔡泽江. 土壤有机碳储量与外源碳输入量关系的建立与验证[J]. 植物营养与肥料学报, 2020, 26(5): 934-941. DOI: 10.11674/zwyf.19287
CAI An-dong, XU Ming-gang, ZHANG Wen-ju, WANG Bo-ren, CAI Ze-jiang. Establishment and verification of the relationship between soil organic carbon storage and exogenous carbon input[J]. Journal of Plant Nutrition and Fertilizers, 2020, 26(5): 934-941. DOI: 10.11674/zwyf.19287
Citation: CAI An-dong, XU Ming-gang, ZHANG Wen-ju, WANG Bo-ren, CAI Ze-jiang. Establishment and verification of the relationship between soil organic carbon storage and exogenous carbon input[J]. Journal of Plant Nutrition and Fertilizers, 2020, 26(5): 934-941. DOI: 10.11674/zwyf.19287

土壤有机碳储量与外源碳输入量关系的建立与验证

Establishment and verification of the relationship between soil organic carbon storage and exogenous carbon input

  • 摘要:
    目的 土壤有机碳是土壤肥力的核心,外源碳的输入量是影响土壤有机碳的主要因素之一。建立外源碳输入量与土壤有机碳储量的内在联系,对深入了解土壤有机碳的形成和土壤肥力的定量提升具有重要意义。
    方法 利用我国南方红壤典型农田长期 (25年) 和短期 (8年) 定位试验平台,选择25年长期施肥试验中CK (不施肥)、NP (氮磷化肥配施)、NPK (氮磷钾化肥配施)、NPKM1 (NPK与有机肥配施);1.5NPKM1 (1.5倍NPKM1) 和M2 (单施有机肥) 6个处理的数据,建立外源碳输入量与土壤有机碳储量的变化量及土壤有机碳储量的关系;选择8年短期施肥试验中T0 (氮磷钾配施)、T1 (NPK与15 t/hm2有机肥配施)、T2 (NPK与30 t/hm2有机肥配施) 和T3 (NPK与45 t/hm2有机肥配施) 4个处理的数据,对长期试验建立的关系进行验证。
    结果 与CK相比,长期施用化肥 (NP和NPK) 处理下年均根茬碳输入量显著增加了0.45~0.75 t/hm2;长期单施有机肥 (M2) 及有机肥配施化肥 (NPKM1和1.5NPKM1) 处理下年均根茬碳输入量为1.59~9.36 t/hm2,显著高于CK、NP和NPK处理 (P < 0.05);而短期化肥 (T0) 和有机肥配施化肥 (T1、T2和T3) 处理间年均根茬碳输入量没有显著差异。长期NP、NPK、NPKM1、1.5NPKM1和M2处理下,土壤有机碳储量均能达到稳定值 (即有机碳储量不再随试验年限的增加而变化),分别为24.01、25.16、48.44、48.46和49.83 t/hm2。长期不同施肥处理下土壤有机碳储量的矿化量平均为4.69 t/hm2,维持初始土壤有机碳储量需要累积外源碳输入的量为8.52 t/hm2;通过长期土壤有机碳储量的变化量与外源碳输入量的关系来预测土壤有机碳储量时存在17%的误差,并低估了土壤有机碳储量的增加量;在考虑初始土壤有机碳储量存在差异的情况下,通过土壤有机碳储量与外源碳输入量的关系来预测土壤有机碳储量时仅存在3%的误差;根据土壤有机碳储量与外源碳输入量的关系,维持初始有机碳储量 (SOCa) 所需外源碳的量为54.35 × 34.62/(48.71 − SOCa) − 1,提升土壤有机碳储量到SOCb时所需外源碳的量为1881.60 × (SOCb − SOCa) / (48.71 − SOCb) × (48.71 − SOCa)。
    结论 根据初始土壤肥力状况,通过土壤有机碳储量与外源碳输入量的关系,可以准确量化土壤有机碳提升所需外源碳输入量。

     

    Abstract:
    Objectives Soil organic carbon (SOC) plays a crucial role in soil fertility, and exogenous carbon (C) input is an important source to regulate its balance. The establishment of their internal relationship will provide an effective tool for quantitative soil fertility improvement in agricultural ecosystem.
    Methods Two localized fertilization experiments were used in this research: one was 25-year long and the other was 8-year long. The data were collected from the treatments of no fertilizer (CK), chemical N and P (NP), chemical NPK fertilizers (NPK), NPK with manure (NPKM1), 1.5 times of NPKM1 (1.5NPKM1) and manure (M2) alone, and the data were used to establish the relationship between SOC and exogenous C input in the 25-year experiment. The data were also collected from the four treatments in the 8-year experiment, including chemical NPK fertilizers (T0) and NPK combined with 15 t/hm2 (T1), 30 t/hm2 (T2) and 45 t/hm2 manure (T3). These data were used to verify the accuracy of the established relationships.
    Results Compared with CK in the 25-year experiment, the application of chemical fertilizer (NP and NPK) significantly increased the annual C input of crop residues by 0.45–0.75 t/hm2. The application of manure (M2) and manure combined with chemical fertilizer (NPKM1 and 1.5NPKM1) showed an annual C input of crop residues with 1.59–9.36 t/hm2, which was significantly higher than that in CK, NP and NPK treatments (P < 0.05). However, the annual C input of crop residues had no significant difference among T0, T1, T2 and T3 treatments in the 8-year experiment. SOC storage under long-term fertilizations could reach a steady value, namely SOC storage did not change with the increase of experimental years, with 24.01, 25.16, 48.44, 48.46 and 49.83 t/hm2 under NP, NPK, NPKM1, 1.5NPKM1 and M2 treatments, respectively. The mineralized amount of SOC storage was 4.69 t/hm2 based on long-term different fertilizations. To maintain the initial SOC storage, 8.52 t/hm2 of exogenous C was inputted. There was a 17% error in predicting SOC storage through the relationship between the change of SOC storage and exogenous C input. Considering the difference of initial SOC storage, only 3% error existed in the prediction of SOC storage through the relationship between SOC storage and exogenous C input. According to the relationship between SOC storage and exogenous C input, the amount of exogenous C needed to maintain initial SOCa storage and increase SOC storage to SOCb was 54.35 × 34.62 / (48.71 − SOCa) − 1 and 1881.60 × (SOCb − SOCa) / (48.71 − SOCb) × (48.71 − SOCa), respectively.
    Conclusions The relationship between SOC storage and exogenous C input based on the initial soil fertility status, could be used to accurately quantify the exogenous C input to improve soil fertility.

     

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