Structural Convergence of Maize and Wheat Straw during Two-Year Decomposition under Different Climate Conditions

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• 作者：Xiaoyue Wang ; Bo Sun ; Jingdong Mao ; Yueyu Sui ; Xiaoyan Cao
• 刊名：Environmental Science & Technology (ES&T)
• 出版年：2012
• 出版时间：July 3, 2012
• 年：2012
• 卷：46
• 期：13
• 页码：7159-7165
• 全文大小：350K
• 年卷期：v.46,no.13(July 3, 2012)
• ISSN：1520-5851

文摘

Straw decomposition plays an important role in soil carbon sequestration. Litter quality and climate condition are considered to be key factors that regulate straw decomposition. This study investigated the decomposition characteristics of wheat and maize straw under cold temperate, warm temperate, and midsubtropic climate conditions, and examined whether the chemical structures of straw residues became similar during decomposition under different climate conditions. Straws were put in 0.074-mm-mesh size litter bags to exclude soil fauna and buried in black soil plots at three experimental stations located in the aforementioned climate regions to rule out the impact of soil type. The decomposition rate constants of wheat straw and maize straw increased linearly with temperature, and the former was more sensitive to temperature. Climate conditions and straw quality had marked effects on the residual material structure in the first half year of decomposition, but then decreased. Wheat and maize straw showed common decomposition characteristics with a decrease of O/N-alkyl carbons and di-O-alkyls, and a simultaneous increase of alkyl carbons, aromatic carbons, aromatic C鈥揙 groups, and COO/N鈥揅鈺怬 groups. Overall, the results indicated that the chemical compositions of the two types of straw became similar after 2-year decomposition under different climate conditions.