Short-term winter snow reduction stimulates soil nutrient leaching without changing the microbial biomass in an alpine fir forest
Short-term winter snow reduction stimulates soil nutrient leaching without changing the microbial biomass in an alpine fir forest
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短期冬季降雪刺激土壤养分淋溶而不改变高山冷杉林的微生物生物量
DOI：
10.1016/j.gecco.2020.e01434
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发表时间：
2021
影响因子：
4
通讯作者：
Jian Zhang
中科院分区：
文献类型：
--
作者：
Fan Yang;Xiangyin Ni;Xin Zeng;Han Li;Bo Tan;Ziyi Liang;Bowen Liu;Zhenfeng Xu;Jian Zhang
冬季积雪为土壤微生物维持了一个相对温暖的环境，并调节了寒冷生态系统中的土壤地球化学循环;然而，气候变暖引起的积雪减少可能会改变土壤溶解性养分淋溶和微生物生物量。在这里，我们在青藏高原东部的高山森林进行了雪深操纵实验。我们评估了以下影响积雪减少和清除过程中的积雪形成，覆盖和融化期：溶解有机碳，氮，铵和硝酸盐的浓度;微生物生物量碳和氮;和微生物呼吸速率。我们发现，溶解性有机碳和氮浓度减少后积雪减少，但显着增加后积雪清除和土壤硝酸盐浓度显着增加后积雪减少。微生物生物量碳和氮显着高于在积雪覆盖和融化期间的积雪形成期间，虽然在积雪融化期间的微生物呼吸速率高于在积雪形成和覆盖期间。积雪减少对土壤微生物生物量碳、氮浓度及转化酶、脲酶活性无显著影响。积雪减少对有机质土壤硝酸盐含量和微生物呼吸速率的影响大于矿质土壤。这些结果表明，短期积雪减少在第一个冬天的操作刺激土壤有效养分的淋溶，但没有改变微生物生物量。总的来说，我们的研究表明，土壤微生物对积雪减少的负面影响具有快速的适应性。虽然微生物活性和生物量是解耦的，但在不同的土壤层位上，有效氮和酶活性发生了全面的相互作用，这可能代表了在暖冬冻融循环介导的地下分解中的特殊生态功能。
Winter snowpack maintains a relatively warm environment for soil microorganisms and modulates soil biogeochemical cycles in cold ecosystems; however, snowpack reduction induced by climate warming may change soil dissolved nutrient leaching and microbial biomass. Here, we performed a snow depth manipulation experiment in an alpine forest on the eastern Tibetan Plateau. We assessed the following effects of snowpack reduction and removal during the snow formation, coverage and melt periods: the concentrations of dissolved organic carbon, nitrogen, ammonium and nitrate; microbial biomass carbon and nitrogen; and the microbial respiration rate. We found that dissolved organic carbon and nitrogen concentrations decreased after snowpack reduction but significantly increased after snowpack removal and that the soil nitrate concentration significantly increased after snowpack reduction. Microbial biomass carbon and nitrogen were significantly higher during the snow formation period than during the snow coverage and melt periods, although the microbial respiration rate was higher during the snow melt period than during the snow formation and coverage periods. However, the snowpack reduction did not significantly affect the soil microbial biomass carbon and nitrogen concentrations or invertase and urease activities. The effects of snowpack reduction on the soil nitrate concentration and microbial respiration rate were stronger in the organic soil than in the mineral soil. These results suggest that short-term snowpack reduction over the first winter of manipulation stimulated the leaching of soil available nutrient but did not change the microbial biomass. Overall, our study indicates that soil microbes have rapid adaptability to the negative effects of snowpack reduction. Although microbial activity and biomass are decoupled, a comprehensive interaction occurs with available nitrogen and enzyme activities at different soil horizons, which may represent a special ecological function in the underground decomposition mediated by the freeze-thaw cycle during a warmer winter.
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影响因子：
4.8
作者：
Larsen, KS;Jonasson, S;Michelsen, A
通讯作者：
Michelsen, A
影响因子：
1.7
作者：
X. Ni;Wanqin Yang;Han Li;Liya Xu;Jie He;B. Tan;Fuzhong Wu
通讯作者：
X. Ni;Wanqin Yang;Han Li;Liya Xu;Jie He;B. Tan;Fuzhong Wu
影响因子：
9.7
作者：
Miki U. Ueda;O. Muller;Masahiro Nakamura;T. Nakaji;T. Hiura
通讯作者：
Miki U. Ueda;O. Muller;Masahiro Nakamura;T. Nakaji;T. Hiura
影响因子：
18.3
作者：
Pithan, Felix;Mauritsen, Thorsten
通讯作者：
Mauritsen, Thorsten
影响因子：
2.2
作者：
Edwards, Anthony C.;Scalenghe, Riccardo;Freppaz, Michele
通讯作者：
Freppaz, Michele