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| 1 | Plant property regulates soil bacterial community structure under altered precipitation regimes in a semi-arid desert grassland, China显示文摘Variations of precipitation have great impacts on soil carbon cycle and decomposition of soil organic matter.Soil bacteria are crucial participants in regulating these ecological processes and vulnerable to altered precipitation.Studying the impacts of altered precipitation on soil bacterial community structure can provide a novel insight into the potential impacts of altered precipitation on soil carbon cycle and carbon storage of grassland.Therefore,soil bacterial community structure under a precipitation manipulation experiment was researched in a semi-arid desert grassland in Chinese Loess Plateau.Five precipitation levels,i.e.,control,reduced and increased precipitation by 40%and 20%,respectively(referred here as CK,DP40,DP20,IP40,and IP20)were set.The results showed that soil bacterial alpha diversity and rare bacteria significantly changed with altered precipitation,but the dominant bacteria and soil bacterial beta diversity did not change,which may be ascribed to the ecological strategy of soil bacteria.The linear discriminate analysis(LDA)effect size(LEfSe)method found that major response patterns of soil bacteria to altered precipitation were resource-limited and drought-tolerant populations.In addition,increasing precipitation greatly promoted inter-species competition,while decreasing precipitation highly facilitated inter-species cooperation.These changes in species interaction can promote different distribution ratios of bacterial populations under different precipitation conditions.In structural equation model(SEM)analysis,with changes in precipitation,plant growth characteristics were found to be drivers of soil bacterial community composition,while soil properties were not.In conclusion,our results indicated that in desert grassland ecosystem,the sensitive of soil rare bacteria to altered precipitation was stronger than that of dominant taxa,which may be related to the ecological strategy of bacteria,species interaction,and precipitation-induced variations of plant growth characteristics. | ZHANG Lihua GAO Han WANG Junfeng ZHAO Ruifeng WANG Mengmeng HAO Lianyi GUO Yafei JIANG Xiaoyu ZHONG Lingfei | 2023 | Journal of Arid Land2023，15，5： | 0 |
| 2 | 荒漠草原区地上净初级生产力和土壤呼吸对降水变化的不同响应显示文摘降水变化既影响地上植被动态,也影响地下碳循环过程,尤其以干旱半干旱生态系统对降水的响应更为敏感。然而极端降水如何影响土壤碳固存潜力仍未得出明确结果。本研究在黄土高原西部荒漠草原样地实施了为期3年的降水控制实验,该实验包含5个降水梯度(即自然降水(对照),以及在自然降水基础上的减水40%、减水20%、增水20%、增水40%)。通过对不同降水处理下植物生长指标、地上净初级生产力(ANPP)、土壤水分和土壤呼吸(Rs)进行监测,采用双侧不对称模型揭示ANPP和Rs对降水变化的响应规律;采用结构方程模型,分析降水变化下影响ANPP和Rs的直接和间接因素。研究结果表明,ANPP对极端干旱的响应比极端湿润更敏感,在干旱和湿润年份均符合负向不对称模型。ANPP的变化主要受到降水的直接影响,同时,干旱年份植物密度的变化也对ANPP产生了影响。在湿润年份,Rs对降水变化的响应也呈负向不对称性。然而,干旱年份,Rs对降水变化表现出正向不对称响应,即对降水增加响应的敏感性高于降水减少,这可能与植物生长和ANPP对增水处理的正响应增加使自氧呼吸增强,及降水事件对异氧呼吸具有较强的‘Birch效应’有关。在干旱年份Rs对极端干旱(减水40%处理)表现出饱和响应。ANPP和Rs对降水格局改变的响应模式差异表明荒漠草原区极端湿润或干旱可能降低研究区土壤碳固存的潜力。 | Lihua Zhang Junfeng Wang Ruifeng Zhao Yafei Guo Lianyi Hao | 2022 | Journal of Plant Ecology2022，15，1： | 0 |
| 3 | Rechargeable Na-CO_(2) Batteries Starting from Cathode of Na2CO_(3) and Carbon Nanotubes显示文摘Na-CO_(2) batteries have attracted signifcant attentions due to their high energy density and efective utilization of greenhouse gas CO_(2).However,all reported Na-CO_(2) batteries employ excessive preloaded metal Na,which will lead to safety issues such as dendrite formation and short circuit.In addition,the charging mechanism of reported Na-CO_(2) batteries is not very clear.Here we report the Na-CO_(2) batteries,starting from the cathode of cheap Na2CO_(3) and multiwalled carbon nanotubes(CNTs).Due to the efective electron transfer and high reactivity,the decomposition of Na2CO_(3) and CNTs could take place under 3.8 V.Te charging mechanism of 2Na2CO_(3)+C�→4Na+3CO_(2) without any side reactions is revealed by in/ex situ techniques such as Raman,gas chromatograph,and optical microscope.Dendrite-free Na can quantitatively deposit on the Super P/Al anode because of large specifc surface area and low nucleation barrier of the anode for Na plating.Te batteries could deliver an energy density of 183 Wh kg−1(based on the whole mass of the pouch-type batteries,4 g)with stable cycling performance.Tis work reveals that safe rechargeable Na-CO_(2) batteries could be constructed by cheap Na2CO_(3) and multiwalled carbon nanotubes. | Jianchao Sun Yong Lu Hao Yang Mo Han Lianyi Shao Jun Chen | 2018 | Research2018，，1： | 0 |
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