Lasting effect of soil warming on organic matter decomposition depends on tillage practices
Lasting effect of soil warming on organic matter decomposition depends on tillage practices
复制标题
土壤变暖对有机质分解的持久影响取决于耕作方式
DOI：
10.1016/j.soilbio.2015.12.008
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发表时间：
2016-04
影响因子：
9.7
通讯作者：
Kuzyakov, Yakov
中科院分区：
文献类型：
--
作者：
Ouyang, Zhu;Maxim, Dorodnikov;Wilson, Glenn;Kuzyakov, Yakov
全球变暖加速了土壤有机质分解，并对大气CO2产生强烈反馈。这样的效果应该是特别重要的免耕农业实践，其中有机质积累在表土相比，传统的耕作。我们培养土壤样品（0-5厘米），在三个温度水平（15，21和27 °C）从长期耕作和免耕系统，werein situwarmed和non-warmed，以评估温度敏感性的CO2流出，不稳定的有机碳和胞外酶活性。长期变暖的热适应，观察导致SOM分解的持久影响。平均而言，26，14和12%以上的CO2排放在每个孵化温度从温暖的土壤相比，非温暖的土壤。温暖土壤的Q10值低于非温暖土壤。土壤微生物生物量C和溶解性有机C随升温而下降。增温免耕条件下，β-葡萄糖苷酶、几丁质酶和硫酸酯酶的活性均高于未增温耕作条件下。我们的结论是，增加SOM分解由于微生物的刺激，通过变暖是持久的。预测免耕农业在表层土壤中的碳积累应该谨慎，因为这个碳库特别容易受到全球变暖的影响。
Global warming accelerates soil organic matter (SOM) decomposition with strong feedback to atmospheric CO2. Such an effect should be especially important for no-till agricultural practices, where SOM accumulates in the topsoil as compared with conventional tillage. We incubated soil samples (0–5 cm) at three temperature levels (15, 21 and 27 °C) from long-term till and no-till systems that werein situwarmed and non-warmed to assess the temperature sensitivity of CO2efflux, labile organic carbon and extracellular enzyme activities. Thermal adaptation to prolonged warming was observed resulting in a lasting effect on SOM decomposition. On average, 26, 14 and 12% more CO2was emitted at each incubation temperature from the warmed soils compared to the non-warmed soils. TheQ10value was lower for the warmed than the non-warmed soils. Soil microbial biomass C and dissolved organic C declined with warming. The activities of three extracellular enzymes, β-glucosidase, chitinase, and sulfatase, were higher under warming and no-till as compared to non-warmed and tilled soil. We concluded that the increased SOM decomposition due to the stimulation of microorganisms by warming was long-lasting. Predictions of C accumulation in the topsoil by no-till farming should be taken with caution, as this C pool is especially vulnerable to global warming.
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影响因子：
4
作者：
Jing, Xin;Wang, Yonghui;He, Jin-Sheng
通讯作者：
He, Jin-Sheng
影响因子：
2.3
作者：
Geisseler, Daniel;Horwath, William R.;Scow, Kate M.
通讯作者：
Scow, Kate M.
影响因子：
8.8
作者：
Bradford, Mark A.;Davies, Christian A.;Wallenstein, Matthew D.
通讯作者：
Wallenstein, Matthew D.
DOI：
10.1073/pnas.1018189108
发表时间：
2011-06-07
影响因子：
11.1
作者：
Melillo, Jerry M.;Butler, Sarah;Tang, Jim
通讯作者：
Tang, Jim
影响因子：
11.6
作者：
Wallenstein, Matthew D.;McMahon, Shawna K.;Schimel, Joshua P.
通讯作者：
Schimel, Joshua P.