Scientia Agricultura Sinica ›› 2011, Vol. 44 ›› Issue (17): 3575-3583.doi: 10.3864/j.issn.0578-1752.2011.17.010

• SOIL & FERTILIZER·WATER-SAVING IRRIGATION·AGROECOLOGY & ENVIRONMENT • Previous Articles     Next Articles

Characteristics of Organic Carbon Mineralization of Maize Straw in Lime Concretion Black Soil

ZHANG  Li-Juan, CHANG  Jiang, JIANG  Li-Na, XU  Shan, ZHANG  Li-Gan   

  1. 安徽农业大学资源与环境学院
  • Received:2010-07-26 Revised:2010-09-08 Online:2011-09-01 Published:2010-12-02

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Abstract: 【Objective】 In order to better understand the characteristics of organic carbon mineralization of maize stalk in soil, the influences of different temperatures and different maize straw additions on the mineralization and decomposition of maize stalk in lime concretion black soil were investigated under the controlled condition in the laboratory. 【Method】 Mineralization of maize stalk at different temperatures (10℃, 20℃, 30℃) and different levels of maize straw addition (0.3, 1.5 and 3.0 g straw at 50 g soil) were studied by aerobic incubation tests. 【Result】 Results showed that organic carbon mineralization of maize stalk in soil was significantly influenced by temperature. At the same maize straw addition level, the higher the mineralization temperature (from 10℃ to 30℃), the higher the amounts of the organic carbon accumulated in soil. The mean mineralization temperature coefficients (Q10) of soil organic carbon (SOC) were 1.229, 1.251, 1.572, 1.399 at lower temperatures (＜20℃), and 1.006, 1.249, 1.401, 1.374 at higher temperatures (＞20℃) for CK, Ⅰ, Ⅱand Ⅲ treatments, respectively. The Q10 values were higher at lower temperatures (＜20℃) than that at higher temperatures (＞20℃), which indicated that mineralization of SOC was more sensitive to temperature rise at lower temperature. The accumulation and daily mineralization of SOC were increased with the increasing of maize straw addition at the same incubation temperature. The dynamics of SOC mineralization could be well fit by the first-order kinetics equation , and the C0 value increased with the increasing of straw addition. However, the potentially mineralized carbon (C0) was not significantly affected by temperature. 【Conclusion】 The increase of temperature and maize straw addition may be effective strategies for enhancing mineralization of maize straw in soil, and accelerating accumulation of organic carbon in soil.

Key words: lime concretion black soil, maize straw, organic carbon mineralization, mineralization kinetics

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