| Effects of irrigation with organically polluted water on soil organic carbon |
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| DOI：10.7606/j.issn.1000-7601.2012.02.04 |
| Key Words: organic pollution soil organic carbon pools carbon density soil properties |
| Author Name | Affiliation | | LI Xiaoyun | College of Resources and Environment, Northwest A & F University, Yanggling, Shaanxi 712100, China | | WANG Yiquan | College of Resources and Environment, Northwest A & F University, Yanggling, Shaanxi 712100, China | | SHI Zonglin | College of Resources and Environment, Northwest A & F University, Yanggling, Shaanxi 712100, China | | ZHANG Lu | College of Resources and Environment, Northwest A & F University, Yanggling, Shaanxi 712100, China |
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| Abstract: |
| An experiment was carried out on the farmland soil which was irrigated with organically polluted water for many years in the Jiaokou Irrigation Area, and the soil irrigated with unpolluted ground water was used as the control treatment. The climatic conditions, soil conditions and farming system of the two sample areas were basically consistent. The total organic carbon content and composition in the soil profile were respectively determined, combined with the second national soil survey data, the accumulation rate and density of organic carbon were proved and “the environment carbon capacity” levels of Guanzhong soil and the rising potential of its soil organic carbon were analysed. The results show that: long-term irrigation with organically polluted water can significantly increase organic carbon content in topsoil (0～20 cm), and the increased part mainly was the active organic carbon fractions. The accumulation rate of organic carbon was nearly 3 times as much as the control soil. Non-active organic carbon was in relative balance. The profile distribution of soil organic carbon also underwent obvious differentiation. The change of active organic carbon was more remarkable than the total organic carbon. Soil organic carbon density was also evidently higher in the soil irrigated with organic polluted water than in the control soil, especially in the 0～40 cm layer, and the difference reaches extremely significant level. This experiment confirmed that the Weihe River water is rich in organic matter, and the environment carbon capacity of the farmland soil in Guanzhong area has not yet reached saturated level. The input of exogenous organic carbon can still enhance the soil organic carbon content. |
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