Changes in soil acidity under different land use in Zengcheng District, Guangdong Province
Assessing changes in soil acidity and its potential influencing factors is significant for preventing soil acidification and improving soil quality. Ninety-seven soil samples were collected across Zengcheng District, Guangdong Province, which covered three land use types, i.e., paddy rice field, irr...
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| Autores principales: | , , , |
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| Formato: | article |
| Lenguaje: | ZH |
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Agro-Environmental Protection Institute, Ministry of Agriculture
2021
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/388f7275cf39403bb417788f84dad038 |
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| Sumario: | Assessing changes in soil acidity and its potential influencing factors is significant for preventing soil acidification and improving soil quality. Ninety-seven soil samples were collected across Zengcheng District, Guangdong Province, which covered three land use types, i.e., paddy rice field, irrigated land, and dryland. Soil pH, exchangeable acid, organic matter(SOM), cation exchange capacity, calcium carbonate, total and available nutrients were determined, and their inner relationship was analized. The 83.7% and 16.3% of collected soil samples had pH lower or higher than 6.5, respectively; 37.8%, 37.8%, and 8.1% of total soil samples were located in the range: 5.5 < pH ≤ 6.5, 4.5 < pH ≤ 5.5, and pH ≤ 4.5, respectively. Under different land uses, the pH following the order: paddy soil(6.02) >irrigable land(5.51) > dry land(4.87). The concentration of soil exchangeable hydrogen was much higher in irrigable land and dry land than that from paddy soil; the concentration of soil exchangeable aluminum was following the order: dry land(1.38 cmol·kg-1)>irrigable land(0.72 cmol·kg-1)> paddy soil(0.31 cmol·kg-1). Soil pH had positively correlation with soil calcium carbonate and total potassium, and negatively correlation with soil exchangeable acid and Olsen-P; soil exchangeable hydrogen had positively correlation with Olsen-P and available potassium, and negatively correlation with calcium carbonate; soil exchangeable aluminum had positively correlation with cation exchange capacity and Olsen-P, and negatively correlated with calcium carbonate and total potassium. Our study indicated that land use was one of the important factors influencing soil acidity, and dry land and irrigable land had much strong acidity than that from paddy soil, and the mechanism need to be further research. |
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