| Autor: |
Ping HUANG, Jia-bao ZHANG, Xiu-li XIN, An-ning ZHU, Cong-zhi ZHANG, Dong-hao MA, Qiang-gen ZHU, Shan YANG, Sheng-jun WU |
| Jazyk: |
angličtina |
| Rok vydání: |
2015 |
| Předmět: |
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| Zdroj: |
Journal of Integrative Agriculture, Vol 14, Iss 1, Pp 148-157 (2015) |
| Druh dokumentu: |
article |
| ISSN: |
2095-3119 |
| DOI: |
10.1016/S2095-3119(14)60750-4 |
| Popis: |
Cropland productivity has been significantly impacted by soil acidification resulted from nitrogen (N) fertilization, especially as a result of excess ammoniacal N input. With decades' intensive agricultural cultivation and heavy chemical N input in the Huang-Huai-Hai Plain, the impact extent of induced proton input on soil pH in the long term was not yet clear. In this study, acidification rates of different soil layers in the soil profile (0–120 cm) were calculated by pH buffer capacity (pHBC) and net input of protons due to chemical N incorporation. Topsoil (0–20 cm) pH changes of a long-term fertilization field (from 1989) were determined to validate the predicted values. The results showed that the acid and alkali buffer capacities varied significantly in the soil profile, averaged 692 and 39.8 mmolc kg−1 pH−1, respectively. A significant (P |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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