长期钙施肥通过影响红壤中的氧化铁介导微生物和植物源碳积累

IF 6.8 1区农林科学 Q1 SOIL SCIENCE

Soil & Tillage Research Pub Date : 2025-09-23 DOI:10.1016/j.still.2025.106885

Tingting Sun , Tian Zhang , Zhufeng Wang , Zhu Tongbin , Jianbo Fan , Zhigang Huang

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引用次数: 0

摘要

钙（Ca）通过物理和化学保护对土壤有机碳（SOC）的固存和稳定起作用。然而，长期添加钙如何影响微生物和植物来源的C及其影响因素仍不清楚。通过对中国南方红壤（0-10、10-20和20-40 cm土层）在NPK和NPK+Ca施肥制度下36年的长期田间试验，我们测定了氨基糖和木质素酚的含量，以探讨钙添加对微生物和植物源碳的影响。在0 ~ 10 cm土壤中，氮磷钾和钙配施使植物源性C（木质素酚）含量降低了39 %，占有机碳的比例降低了25 %，说明氮磷钾处理土壤有机碳含量较低。植物源性碳的减少主要是由于植物凋落物转化酶活性和碳吸附铁氧化物含量的下降。NPK+Ca处理下0 ~ 40 cm土壤微生物坏死块C含量保持不变，这是Ca- oc增加和Fe-OC减少抵消的结果，表明Ca-Fe-OC配合物的矿物转移和相互作用。综上所述，本研究为长期钙施肥通过介导酸性土壤中有机矿物质关联对植物和微生物来源的碳固存的影响提供了直接证据。

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Long-term calcium fertilization mediates microbial and plant-derived carbon accumulation by influencing iron oxides in red soils

Calcium (Ca) contributes to soil organic carbon (SOC) sequestration and stabilization through physical and chemical protection. Yet, how long-term Ca addition affects microbial- and plant-derived C and the influencing factors remained unclear. We determined the contents of amino sugars and lignin phenols to explore the effects of Ca addition on microbial- and plant-derived C during a 36-year long-term field experiment under NPK and NPK+Ca fertilization regimes in red soils (0–10, 10–20, and 20–40 cm soil layers) in southern China. The combination of NPK and Ca fertilization reduced plant-derived C (lignin phenols) content by 39 % and its proportion to SOC by 25 % in 0–10 cm soils, which explained a lower SOC content compared to NPK treatment. The reduction in plant-derived C was primarily attributed to the declines in enzyme activities for plant litter transformation and iron (Fe) oxides content for SOC adsorption. In contrast, microbial necromass C content remained constant in 0–40 cm soils under NPK+Ca fertilization, which was a result of the offset of the increased Ca-OC and decreased Fe-OC, indicating mineral shifts and interactions of Ca-Fe-OC complexes. Taken together, this study provides direct evidence for the effects of long-term Ca fertilization on plant-and microbial-derived C sequestration via mediating organo-minerals associations in acid soils.

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来源期刊

Soil & Tillage Research 农林科学-土壤科学

CiteScore

13.00

自引率

6.20%

发文量

266

审稿时长

5 months

期刊介绍： Soil & Tillage Research examines the physical, chemical and biological changes in the soil caused by tillage and field traffic. Manuscripts will be considered on aspects of soil science, physics, technology, mechanization and applied engineering for a sustainable balance among productivity, environmental quality and profitability. The following are examples of suitable topics within the scope of the journal of Soil and Tillage Research: The agricultural and biosystems engineering associated with tillage (including no-tillage, reduced-tillage and direct drilling), irrigation and drainage, crops and crop rotations, fertilization, rehabilitation of mine spoils and processes used to modify soils. Soil change effects on establishment and yield of crops, growth of plants and roots, structure and erosion of soil, cycling of carbon and nutrients, greenhouse gas emissions, leaching, runoff and other processes that affect environmental quality. Characterization or modeling of tillage and field traffic responses, soil, climate, or topographic effects, soil deformation processes, tillage tools, traction devices, energy requirements, economics, surface and subsurface water quality effects, tillage effects on weed, pest and disease control, and their interactions.