Title: Effects of irrigation with organically polluted water on soil organic carbon
Abstract: An experiment was carried out on farmland soil which was irrigated with organically polluted water for many years in Jiaokou Irrigation Area,and soil irrigated with unpolluted ground water was used as control treatment.The climatic conditions,soil conditions and farming system of two sample areas were basically consistent.The total organic carbon content and composition in soil profile were respectively determined,combined with second national soil survey data,the accumulation rate and density of organic carbon were proved and the environment carbon levels of Guanzhong soil and 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 increased part mainly was active organic carbon fractions.The accumulation rate of organic carbon was nearly 3 times as much as 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 total organic carbon.Soil organic carbon density was also evidently higher in soil irrigated with organic polluted water than in control soil,especially in 0~40 cm layer,and difference reaches extremely significant level.This experiment confirmed that Weihe River water is rich in organic matter,and environment carbon capacity of farmland soil in Guanzhong area has not yet reached saturated level.The input of exogenous organic carbon can still enhance soil organic carbon content.
Publication Year: 2012
Publication Date: 2012-01-01
Language: en
Type: article
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