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Impacts of fertilization practices on pH and the pH buffering capacity of calcareous soil

文献类型： 外文期刊

作者： Zhang, Yongyong 1 ; Zhang, Shuiqing 3 ; Wang, Ruzhen 1 ; Cai, Jiangping 1 ; Zhang, Yuge 4 ; Li, Hui 1 ; Huang, Shaomin 3 ;

作者机构： 1.Chinese Acad Sci, Inst Appl Ecol, Shenyang, Peoples R China

2.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing, Peoples R China

3.Henan Acad Agr Sci, Inst Plant Nutr Environm & Resources, Zhengzhou 450002, Peoples R China

4.Shenyang Univ, Univ Coll Environm, Shenyang, Peoples R China

关键词： Long-term fertilization;cation exchangeable capacity;calcium carbonate;base cations;soil acidification;calcareous soil

期刊名称：SOIL SCIENCE AND PLANT NUTRITION （ 影响因子：2.389； 五年影响因子：2.525 ）

ISSN：

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收录情况： SCI

摘要： Modern intensive agricultural practices, particularly the use of nitrogen fertilizers, have accelerated soil acidification on a global scale. The soil pH buffering capacity (pHBC) is often used to quantify the soil acidification rate. Calcareous soils have relatively higher pH and pHBC, reflecting the presence of carbonate minerals; however, the impact of long-term fertilization treatment on pH and pHBC is poorly understood for calcareous soils. Here, calcareous soil samples (0-20 cm) were collected from fields receiving six different fertilization treatments for 22 years: control (CK, unfertilized but planted); nitrogen (N); nitrogen and phosphorus (NP); nitrogen, phosphorus and potassium (NPK); combined manure and NPK (NPKM); and combined corn-stover and NPK (NPKS). Both pH and pHBC significantly decreased for all treatments relative to CK. NPKS treatment had the lowest soil pH. Compared with CK, the soil pHBC decreased 5.7 to 17.3% under different treatments. The calcium carbonate (CaCO3) content was significantly reduced by fertilization treatments, with a maximum decrease under the NPKS treatment. Structural equation model (SEM) analysis revealed that calcium carbonate and soil organic matter (SOM) made important contributions to effective cation exchangeable capacity (ECEC). Soil pHBC was directly controlled by ECEC, while CaCO3 and SOM indirectly contributed to the pHBC through ECEC. These results indicated that NPKS treatment induces more severe soil acidification, reflecting the higher H+ input and lower pHBC under this treatment.

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