| 1 | Management scheme influence and nitrogen addition effects on soil CO_(2),CH_(4),and N_(2)O fluxes in a Moso bamboo plantation显示文摘Background:It is still not clear whether the effects of N deposition on soil greenhouse gas(GHG)emissions are influenced by plantation management schemes.A field experiment was conducted to investigate the effects of conventional management(CM)versus intensive management(IM),in combination with simulated N deposition levels of control(ambient N deposition),30 kg N·ha^(−1)·year^(−1)(N30,ambient+30 kg N·ha^(−1)·year^(−1)),60 kg N·ha^(−1)·year^(−1)(N60,ambient+60 kg N·ha^(−1)·year^(−1)),or 90 kg N·ha^(−1)·year^(−1)(N90,ambient+90 kg N·ha^(−1)·year^(−1))on soil CO_(2),CH_(4),and N_(2)O fluxes.For this,24 plots were set up in a Moso bamboo(Phyllostachys edulis)plantation from January 2013 to December 2015.Gas samples were collected monthly from January 2015 to December 2015.Results:Compared with CM,IM significantly increased soil CO_(2) emissions and their temperature sensitivity(Q_(10))but had no significant effects on soil CH_(4) uptake or N_(2)O emissions.In the CM plots,N30 and N60 significantly increased soil CO_(2) emissions,while N60 and N90 significantly increased soil N_(2)O emissions.In the IM plots,N30 and N60 significantly increased soil CO_(2) and N_(2)O emissions,while N60 and N90 significantly decreased soil CH_(4) uptake.Overall,in both CM and IM plots,N30 and N60 significantly increased global warming potentials,whereas N90 did not significantly affect global warming potential.However,N addition significantly decreased the Q_(10) value of soil CO_(2) emissions under IM but not under CM.Soil microbial biomass carbon was significantly and positively correlated with soil CO_(2) and N_(2)O emissions but significantly and negatively correlated with soil CH_(4) uptake.Conclusion:Our results indicate that management scheme effects should be considered when assessing the effect of atmospheric N deposition on GHG emissions in bamboo plantations. | Junbo Zhang Quan Li Jianhua Lv Changhui Peng Zhikang Gu Lianghua Qi Xuzhong Song Xinzhang Song | 2021 | Forest Ecosystems2021，8，1： | 2 |
| 2 | Synthesis and Characterization of Er3+∶Y3Al5O12 Nanocrystalline Powders Prepared by Sol-Gel Method显示文摘Nano-sized Er3+∶Y3Al5O12 powders was successfully prepared via a simple sol-gel route at as low a temperature at 800 ℃ whereas a temperature much higher is necessary to obtain this compound by solid state synthesis (about 1500 ℃). The phase purity, composition and microstructural features of the materials were analyzed by means of X-ray diffraction(XRD), infrared spectroscopy(IR) and transmission electron microscopy(TEM), and no other intermediate phase were observed to form in the range of 700~1000 ℃. The luminescence spectra of Er3+ substituted for Y3+ in YAG in 1% content was characterized on samples at different temperature. | Li Zhanfa Yuan Duorong Duan Xiulan Shi Xuzhong Song Jian'an Wang Lihua | 2006 | Journal of Rare Earths2006，24，z1： | 0 |
| 3 | A multiaxial lead-free two-dimensional organic-inorganic perovskite ferroelectric显示文摘Two-dimensional(2 D)hybrid organic-inorganic perovskites(HOIPs)have recently gained tremendous interest because of their unique features in contrast to three-dimensional counterparts and traditional 2 D materials.However,although some 2 D HOIP ferroelectrics have been achieved,the issue of toxic Pb and uniaxial nature impede their further application.Herein,for the first time,we report a lead-free 2 D HOIP multiaxial ferroelectric,[3,3-difluorocyclobutylammonium]2 CuCl4(1),which shows four ferroelectric axes and eight equivalent polarization directions,more than those of the other 2 D HOIP ferroelectrics and even the inorganic perovskite ferroelectric BaTiO3(three ferroelectric axes and six equivalent polarization directions).1 also features a high Curie temperature of 380 K and exhibits remarkable thermochromism of color change from green-yellow to dark brown.To our knowledge,1 is the first multiaxial lead-free2 D HOIP ferroelectric.This work sheds light on the exploration of better lead-free 2 D HOIP ferroelectrics. | Chao-Ran Huang Xuzhong Luo Xiao-Gang Chen Xian-Jiang Song Zhi-Xu Zhang Ren-Gen Xiong | 2021 | National Science Review2021，8，5： | 0 |
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