Soil oxidases recovered faster than hydrolases in a 50-year chronosequence of desert revegetation
Soil oxidases recovered faster than hydrolases in a 50-year chronosequence of desert revegetation
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在 50 年沙漠植被恢复时间序列中，土壤氧化酶的恢复速度快于水解酶
DOI：
10.1007/s11104-012-1162-2
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发表时间：
2012-03
期刊：
影响因子：
4.9
通讯作者：
Lei Huang
中科院分区：
文献类型：
--
作者：
Rong-Liang Jia;Yi-Gang Hu;Ming-Zhu He;Lei Huang
目的沙漠以碱性土壤为特征，有机质和养分含量低，土壤氧化电位高。我们假设在固沙群落演替过程中，氧化酶活性比水解酶活性恢复得更快。方法选择不同年份稳定的沙丘，包括腾格里沙漠东南边缘的移动沙丘和草原，以50年的时间顺序研究细胞外酶活性（EEA）的恢复。结果在所有10个研究地点和EEA中，氧化酶活性均显着高于水解酶活性从过氧化氢酶、酚氧化酶、蔗糖酶、脲酶、碱性磷酸酶、α-淀粉酶到纤维素酶均呈下降趋势。经过 50 年的植被恢复，表土中的大多数 EEA 恢复到草原 EEA 的 50-83%（脲酶除外）。氧化酶活性比水解酶恢复更早、更快，而水解酶活性在50年的时间序列中在19-25年恢复最快。结论EEA的恢复受到固沙群落演替的调节：氧化酶活性在灌木占主导地位的阶段表现出峰值恢复率，而水解酶活性的恢复似乎主要受生物土壤结皮和一年生植物的调节。
AimsDesert characterized by alkaline soil with low organic matter and nutrients has a high soil oxidative potential. We hypothesized that oxidase activities would recover faster than hydrolases during the succession of sand-fixing community.MethodsSand dunes stabilized in different years, including a moving sand dune and a steppe at the southeastern fringe of the Tengger Desert, were selected to investigate restoration of extracellular enzyme activities (EEAs) in a 50-year chronosequence.ResultsOxidases showed significantly higher activities than hydrolases at all ten studied sites and EEAs exibited a decreasing trend from catalase, phenol oxidase, sucrase, urease, alkaline phosphatase, α-Amylase to cellulase. After 50 years of revegetation, most EEAs in topsoil recovered to 50–83% of that of the steppe except for urease. Oxidase activities recovered earlier and faster than hydrolases, while hydrolases activities attained the fastest recovery at 19–25 years in the 50-year chronosequence.ConclusionsRecovery of EEAs was modulated by the succession of the sand-fixed community: oxidases activities exhibited peak recovery rates at the stage when shrubs dominated the community, while recovery of hydrolases activities appeared to be mainly regulated by biological soil crusts and annual plants.
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