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| 1 | Climate and litter C/N ratio constrain soil organic carbon accumulation显示文摘Soil organic carbon(SOC) plays critical roles in stabilizing atmospheric CO2 concentration, but the mechanistic controls on the amount and distribution of SOC on global scales are not well understood. In turn, this has hampered the ability to model global C budgets and to find measures to mitigate climate change. Here, based on the data from a large field survey campaign with 2600 plots across China’s forest ecosystems and a global collection of published data from forested land, we find that a low litter carbon-to-nitrogen ratio(C/N) and high wetness index(P/PET, precipitation-to-potentialevapotranspiration ratio) are the two factors that promote SOC accumulation, with only minor contributions of litter quantity and soil texture. The field survey data demonstrated that high plant diversity decreased litter C/N and thus indirectly promoted SOC accumulation by increasing the litter quality. We conclude that any changes in plant-community composition, plant-species richness and environmental factors that can reduce the litter C/N ratio, or climatic changes that increase wetness index, may promote SOC accumulation. The study provides a guideline for modeling the carbon cycle of various ecosystem scales and formulates the principle for land-based actions for mitigating the rising atmospheric CO2 concentration. | Guoyi Zhou Shan Xu Philippe Ciais Stefano Manzoni Jingyun Fang Guirui Yu Xuli Tang Ping Zhou Wantong Wang Junhua Yan Gengxu Wang Keping Ma Shenggong Li Sheng Du Shijie Han Youxin Ma Deqiang Zhang Juxiu Liu Shizhong Liu Guowei Chu Qianmei Zhang Yuelin Li Wenjuan Huang Hai Ren Xiankai Lu Xiuzhi Chen | 2019 | National Science Review2019，6，4： | 21 |
| 2 | Responses of Soil Acid Phosphomonoesterase Activity to Simulated Nitrogen Deposition in Three Forests of Subtropical China显示文摘Soil acid phosphomonoesterase activity (APA) plays a vital role in controlling phosphorus (P) cycling and reflecting the current degree of P limitation. Responses of soil APA to elevating nitrogen (N) deposition are important because of their potential applications in addressing the relationship between N and P in forest ecosystems. A study of responses of soil APA to simulated N deposition was conducted in three succession forests of subtropical China. The three forests include a Masson pine (Pinus massoniana) forest (MPF)-pioneer community, a coniferous and broad-leaved mixed forest (MF)-transition community and a monsoon evergreen broad-leaved forest (MEBF)-climax community. Four N treatments were designed for MEBF: control (without N added), low-N (50 kg N ha-1 year-1), and medium-N (100 kg N ha-1 year-1) and high-N (150 kg N ha-1 year-1), and only three N treatments (i.e., control, low-N, medium-N) were established for MPF and MF. Results showed that soil APA was highest in MEBF, followed by MPF and MF. Soil APAs in both MPF and MF were not influenced by low-N treatments but depressed in medium-N treatments. However, soil APA in MEBF exhibited negative responses to high N additions, indicating that the environment of enhanced N depositions would reduce P supply for the mature forest ecosystem. Soil APA and its responses to N additions in subtropical forests were closely related to the succession stages in the forests. | HUANG Wen-Juan ZHANG De-Qiang LI Yue-Lin LU XianKai ZHANG Wei HUANG Juan D.OTIENO Z.H.XU LIU Ju-Xiu LIU Shi-Zhong CHU Guo-Wei | 2012 | Pedosphere2012，22，5： | 13 |
| 3 | Phosphorus limitation on photosynthesis of two dominant understory species in a lowland tropical forest显示文摘Aims Elevated nitrogen(N)deposition in tropical regions may accelerate ecosystem phosphorus(P)limitation.However,it is not explicitly addressed that how changes in soil N and P availability affect foliar nutrients and photosynthesis of plants in tropical forests.In this study,we examined the effects of N and P additions on foliar nutrients and net photosynthesis of two dominant understory species,Randia can-thioides(R.canthioides)and Cryptocarya concinna(C.concinna)in an N-saturated old-growth tropical forest(>400-year-old)in south-ern China.Methods A full factorial NP addition experiment(2×2)was established in 2007 and continued through August 2010.Four treatments,including control,N addition(150 kg N ha^(−1) year^(−1)),P addi-tion(150 kg P ha^(−1) year^(−1))and NP addition(150 kg N ha^(−1) year^(−1) plus 150 kg P ha^(−1) year^(−1))were set up in this experiment.Photosynthetic traits maximum photosynthetic CO_(2) assimilation(Amax),stomatal conductance(gs),leaf transpiration(E),light satu-rating point,concentrations of chlorophyll a/b and foliar nutri-ents(N and P)of the two species were measured with standard methods.Important Findings Three years of N addition had no significant effects on any measured photosynthetic parameter of either species.However,N addition significantly elevated foliar N and P concentrations of one species(R.canthioides),resulting in lower photosynthetic nitrogen use effi-ciency(PNUE).N treatments decreased foliar P concentration of the other(C.concinna),resulting in increased photosynthetic phos-phorus use efficiency,which was potentially related to N-induced P shortage.In contrast,positive effects of P treatments on gs of R.can-thioides,Amax and chlorophyll a+b of C.concinna were observed.P treatments also elevated foliar P and PNUE of both species,imply-ing P induced more efficient use of N.Our results suggested a more important role of P than N on influencing photosynthetic traits of these two understory species.Alleviation of P shortage through P addition may enhance photosynthetic performances of some under-story species in N-rich tropical forests. | Feifei Zhu Xiankai Lu Jiangming Mo | 2014 | Journal of Plant Ecology2014，7，6： | 10 |
| 4 | Acousto-optic modulation of photonic bound state in the continuum显示文摘Photonic bound states in the continuum(BICs)have recently been studied in various systems and have found wide applications in sensors,lasers,and filters.Applying BICs in photonic integrated circuits enables low-loss light guidance and routing in low-refractive-index waveguides on high-refractive-index substrates,which opens a new avenue for integrated photonics with functional single-crystal materials.Here,we demonstrate high-quality integrated lithium niobate microcavities inside which the photonic BIC modes circulate and further modulate these BIC modes acoustooptically by using piezoelectrically actuated surface acoustic waves at microwave frequencies.With a high acoustooptic modulation frequency,the acousto-optic coupling is well situated in the resolved-sideband regime.This leads to coherent coupling between microwave and optical photons,which is exhibited by the observed electro-acoustooptically induced transparency and absorption.Therefore,our devices serve as a paradigm for manipulating and controlling photonic BICs on a chip,which will enable many other applications of photonic BICs in the areas of microwave photonics and quantum information processing. | Zejie Yu Xiankai Sun | 2020 | Light(Science & Applications)2020，9，1： | 9 |
| 5 | Genetically optimized on-chip wideband ultracompact reflectors and Fabry–Perot cavities显示文摘Reflectors are an essential component for on-chip integrated photonics. Here, we propose a new method for designing reflectors on the prevalent thin-film-on-insulator platform by using genetic-algorithm optimization.In simulation, the designed reflector with a footprint of only 2.16 μm× 2.16 μm can achieve ~97% reflectivity and 1 dB bandwidth as wide as 220 nm. The structure is composed of randomly distributed pixels and is highly robust against the inevitable corner rounding effect in device fabrication. In experiment, we fabricated on-chip Fabry–Perot(FP) cavities constructed from optimized reflectors. Those FP cavities have intrinsic quality factors of>2000 with the highest value beyond 4000 in a spectral width of 200 nm. The reflectivity fitted from the FP cavity resonances is >85% in the entire wavelength range of 1440–1640 nm and is beyond 95% at some wavelengths.The fabrication processes are CMOS compatible and require only one step of lithography and etch. The devices can be used as a standard module in integrated photonic circuitry for wide applications in on-chip semiconductorlaser structures and optical signal processing. | ZEJIE YU HAORAN CUI XIANKAI SUN | 2017 | Photonics Research2017，5，6： | 7 |
| 6 | ON THE EXISTENCE OF PERIODIC SOLUTIONS FOR THE THIRD-ORDER NONLINEAR ORDINARY DIFFERENTIAL EQUATIONS显示文摘§1IntroductionTheexistenceofperiodicsolutionswasstudiedforthefolowingtriadofdiferentiale-quationsin[1],namelyx…+ax+bx+h(x)=p(... | Huang Xiankai | 1999 | Applied Mathematics(A Journal of Chinese Universities)1999，14，2： | 5 |
| 7 | Nitrogen deposition and its ecological impact in China: An overview显示文摘 | Xuejun Liu Lei Duan Jiangming Mo Enzai Du Jianlin Shen Xiankai Lu Ying Zhang Xiaobing Zhou Chune He Fusuo Zhang | 2010 | Environmental Pollution2010，，10： | 4 |
| 8 | Tracing Method of Natural Sediments by Neutron Activation and Its Application显示文摘A new method of Neutron Activation Analysis (NAA) for sediment movement study is presented in this paper. Through analyzing the natural sediment, the information about natural tracing agents has been obtained, which can show the direction of sediment movement and relative discharge of sediment transportation. Test results in some areas, such as Shantou Harbour and Hangzhou Bay, are in good agreement with those from normal hydrologic measurements and some results are not obtainable with the latter. The NAA is economical, practical and reliable, and should be widely used in engineering practice. | Mao, Zhixiang Yan, Peilan Huang, Jianwei Dai, Xiankai Han, Naibing Chai, Zhifang Qian, Qinfang Ma, Shulan Ma, Jianguo | 1991 | China Ocean Engineering1991，6，3： | 3 |
| 9 | Derivatization of (±) dihydrotetrabenazine for copper-64 labeling towards long-lived radiotracers for PET imaging of the vesicular monoamine transporter 2显示文摘 | Amit Kumar Su-Tang Lo Orhan K. ?z Xiankai Sun | 2014 | Bioorganic & Medicinal Chemistry Letters2014，，： | 1 |
| 10 | Emissions of nitrous oxide from three tropical forests in Southern China in response to simulated nitrogen deposition显示文摘 | Wei Zhang Jiangming Mo Guirui Yu Yunting Fang Dejun Li Xiankai Lu Hui Wang | 2008 | Plant and Soil (-)2008，，1： | 1 |
| 11 | Existence and stability of periodic solutions for Hopfield neutral network equations with periodic input显示文摘 | Dong Qinxi Matsui K Huang Xiankai | 2002 | Nonlinear Analysis TMA2002，49，4： | 1 |
| 12 | On existence of 2π-periodic solutions for delay Duffing eqution x'+g(t,x(t-(t)))= p(t)显示文摘 | | 1994 | Chinese Science Bulletin1994，，39： | 1 |
| 13 | The 2π-periodic solution of delay Duffing equation x”+g(t,x(t-t))=p(t) 显示文摘 | Huang Xiankai Xiang Zigui | 1994 | Chinese Sci Bull1994，39，3： | 1 |
| 14 | G,On existence of 2π-periodic solutions for delay Duffing equation x″+g(t,x(t-τ(t)))=p(t)显示文摘 | Huang Xiankai and Xiang Z | 1994 | Chinese Science Bulletin1994，，： | 1 |
| 15 | Coarse-to-Fine Video Instance Segmentation With Factorized Conditional Appearance Flows显示文摘We introduce a novel method using a new generative model that automatically learns effective representations of the target and background appearance to detect,segment and track each instance in a video sequence.Differently from current discriminative tracking-by-detection solutions,our proposed hierarchical structural embedding learning can predict more highquality masks with accurate boundary details over spatio-temporal space via the normalizing flows.We formulate the instance inference procedure as a hierarchical spatio-temporal embedded learning across time and space.Given the video clip,our method first coarsely locates pixels belonging to a particular instance with Gaussian distribution and then builds a novel mixing distribution to promote the instance boundary by fusing hierarchical appearance embedding information in a coarse-to-fine manner.For the mixing distribution,we utilize a factorization condition normalized flow fashion to estimate the distribution parameters to improve the segmentation performance.Comprehensive qualitative,quantitative,and ablation experiments are performed on three representative video instance segmentation benchmarks(i.e.,YouTube-VIS19,YouTube-VIS21,and OVIS)and the effectiveness of the proposed method is demonstrated.More impressively,the superior performance of our model on an unsupervised video object segmentation dataset(i.e.,DAVIS19)proves its generalizability.Our algorithm implementations are publicly available at https://github.com/zyqin19/HEVis. | Zheyun Qin Xiankai Lu Xiushan Nie Dongfang Liu Yilong Yin Wenguan Wang | 2023 | IEEE/CAA Journal of Automatica Sinica2023，10，5： | 1 |
| 16 | 2π periodic solutions of Duffing equation with delay x+cx+g(x(t-r))= p(t)显示文摘 | Huang Xiankai Chen Wending | 1998 | Progress in Natural Science1998，8，1： | 1 |
| 17 | 2π periodic solutions of Dulling equation with delay x+g(x(t-r))=p(t)显示文摘 | Huang Xiankai Xiang Zigui | 1994 | Chinese Science Bulletin1994，39，3： | 1 |
| 18 | Effects of experimental nitrogen additions on plant diversity in an old-growth tropical forest显示文摘 | Lu Xiankai Mo Jiangming Gilliam F S | 2010 | Global Change Biology2010，16，10： | 1 |
| 19 | Effects of experimental nitrogen additions on plant diversity in tropical forests of contrasting disturbance regimes in Southern China显示文摘 | Lu Xiankai Mo Jiangming Gilliam F S | 2011 | Environmental Pollution2011，159，10： | 1 |
| 20 | 显示文摘 | Zhang Yang Lin Bixia Sun Xiankai | 2005 | Appl Phys Lett2005，86，13： | 1 |
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