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| 1 | Conversion of pure Chinese fir plantation to multi-layered mixed plantation enhances the soil aggregate stability by regulating microbial communities in subtropical China显示文摘Background:Soil aggregates are the basic units of soil structure,and their stability is a key indicator of soil quality and capacity to support ecosystem functions.The impacts of various environmental factors on soil aggregates have been widely studied.However,there remains elusive knowledge on the synergistic effects of changing forest stand structure on soil aggregate stability(SAS),particularly in subtropical China where soil erosion remains a critical issue.Methods:We investigated variations in the components of soil humus(HS),including humic acids(HAs),fulvic acids(FAs),and humins(HMs),under pure Chinese fir(Cunninghamia lanceolata)plantation(PP)and multilayered mixed plantation(MP)comprising C.lanceolata,Castanopsis hystrix,and Michelia hedyosperma.The state of soil aggregate stability,was determined by three separate methods,i.e.,dry-sieving,wet-sieving,and the Le Bissonnais.High-throughput sequencing was used to determine the diversity and composition of microbial communities under PP and MP.We then built partial least squares path models(PLS-PM)for assessing the responses of SAS to the variations in soil microorganisms and HS components.Results:The MP stands had significantly greater SAS(P<0.05),higher content of HAs and more rapid organic matter humification within aggregates,than the PP stands.High-throughput sequencing confirmed that the Pielou andα-diversity index values(Chao1 and Shannon)for fungi were all significantly higher under MP than under PP,while no marked difference was found in bacterialα-diversity between the two plantation types.Moreover,there were markedly greater abundance of three bacterial phyla(Verrucomicrobia,Chloroflexi,and Gemmatimonadetes)and three fungal phyla(Ascomycota,Kickxellomycota,and Glomeromycota),and significantly less abundance of two bacterial phyla(Planctomycetes and Firmicutes)and four fungal phyla(Basidiomycota,Mortierellomycota,Mucoromycota,and Rozellomycota)under MP than under PP.The Chloroflexi and Ascomycota phyla appeared to be the primary drivers of soil aggregate distribution.Our findings revealed that the promotion of SAS under MP was mainly driven by increased soil organic matter(SOM)content,which altered bacterial communities and enhanced fungal diversity,thereby increasing HAs content and the rate of organic matter humification.Conclusions:Considering the combined effects of enhanced soil quality,productivity,and relevant economic costs,introducing broadleaved tree species into Chinese fir plantations can be an effective strategy for stabilizing soil structure against erosion in subtropical China.Our study elucidated the controls on variations of SAS in Chinese fir-dominated plantations and demonstrated the benefit of converting pure Chinese fir plantation to multi-layered mixed plantations in increasing soil structural stability and improving site quality. | Guannv Gao Xueman Huang Haocheng Xu Yi Wang Weijun Shen Wen Zhang Jinliu Yan Xiaoyan Su Shushou Liao Yeming You | 2022 | Forest Ecosystems2022，9，6： | 4 |
| 2 | A semi-analytical approach for stiffness modeling of PKM by considering compliance of machine frame with complex geometry显示文摘Stiffness modeling is one of the most significant issues in the design of parallel kinematic machine (PKM). This paper presents a semi-analytical approach that enables the stiffness of PKM with complex machine frame geometry to be estimated effectively. This approach can be implemented by three steps: (i) decomposition of the entire system into two sub-systems associated with the parallel mechanism and the machine frame respectively; (ii) stiffness modeling of each sub-system using the analytical approach and the finite element analysis; and (iii) generation of the stiffness model of the entire system by means of linear superposition. In the modeling process of each sub-system, the virtual work princi- ple and overall deflection Jacobian are employed with special attention to the bending rigidity of the constrained passive limb and the interface stiffness of the machine frame. The stiffness distribution of a 5-DOF hybrid robot named TriVariant-B is investigated as an example to illustrate the effectiveness of this approach. The contributions of component rigidities to that of the system are evaluated using global indices. It shows that the results achieved by this approach have a good match to those obtained through finite element analysis and experiments. | WANG YouYu HUANG Tian ZHAO XueMan MEI JiangPing Derek G CHETWYND | 2008 | Chinese Science Bulletin2008，53，16： | 4 |
| 3 | Conceptual design and dimensional synthesis for a 3-DOF module of the TriVariant--a novel 5-DOF reconfigurable hybrid robot 显示文摘 | Huang Tian Li Meng Zhao Xueman | 2005 | IEEE Transactions on Robotics2005，21，3： | 1 |
| 4 | Conceptual design and dimensional synthesis for a 3-DOF module of the Tri Variant-a novel 5-DOF reconfigurable hybrid robot显示文摘 | HUANG Taosheng LI Meng ZHAO Xueman | 2005 | IEEE Transaction on Robotics2005，21，3： | 1 |
| 5 | Design of a 4-DOF hybrid PKM module for large structural component assembly显示文摘 | HUANG Tian WANG Panfeng ZHAO Xueman | 2010 | CIRP Annals-Manufacturing Technology2010，59，： | 1 |
| 6 | Design of a4-DOF-hybrid PKM module for large structural component assembly显示文摘 | HUANG Tian WANG Panfeng ZHAO Xueman | 2010 | CIRP Annals-Manufacturing Technology2010，59，1： | 1 |
| 7 | Conceptual design and dimensional synthesis for a 3-DOF module of the TriVariant-a novel 5-DOF reconfigurable hybrid robot显示文摘 | HUANG Tian LI Meng ZHAO Xueman | 2005 | IEEE Transaction on Robotics2005，21，3： | 1 |
| 8 | Conceptual design and dimensional synthesis for a 3-DOF module of the TriVariant-A novel 5-DOF reconfigurable hybrid robot显示文摘 | HUANG Tian LI Meng ZHAO Xueman | 2005 | IEEE Transaction on Robotics2005，21，3： | 1 |
| 9 | Conceptual design and dimensional synthesis of 3-DOF module of the trivariant-a novel 5-DOF reconfigurable hybrid robot显示文摘 | HUANG Tian LI Meng ZHAO Xueman | 2005 | IEEE Transactions on Robotics2005，21，3： | 1 |
| 10 | Design of a 4-DOF hybrid PKM module for large structural component assembly显示文摘 | HUANG Tian WANG Panfeng ZHAO Xueman | 2010 | CIRP AnnalsManufacturing Technology2010，59，1： | 1 |
| 11 | Conceptual design and dimensional synthesis for a 3-DOF module of the TriVariant--a novel 5-DOF reconfigurable hybrid robot显示文摘 | HUANG Tian LI Meng ZHAO Xueman | 2005 | IEEE Transactions on Robotics2005，21，3： | 1 |
| 12 | Conceptual design and dimensional synthesis for a 3-DOF module of the TriVariant- A novel 5 -dof reconfigurable hybrid robot 显示文摘 | HUANG Tian LI Meng ZHAO Xueman | 2005 | IEEE Transaction on Robtics2005，21，3： | 1 |
| 13 | Design of a 4-DOF hybrid PKM module for large structural component assembly显示文摘 | Huang Tian Wang Panfeng Zhao Xueman | 2010 | CIRP Annals Manufacturing Technology2010，，59： | 1 |
| 14 | Conceptual design and dimensional synthesis for a 3-DOF module of the TriVariant-a novel 5-DOF reconfigurable hybrid robot显示文摘 | HUANG Tian LI Meng ZHAO Xueman | 2005 | IEEE Transactions on Robotics2005，21，3： | 1 |
| 15 | Conceptual design and dimensional synthesis of a reconfigurable hybrid robot显示文摘 | LI Meng HUANG Tian ZHAO Xueman | 2005 | ASME Journal of Manufacturing Science and Engineering2005，127，3： | 1 |
| 16 | Design of a 4-DOF hybrid PKM module for large structural component assembly显示文摘 | HUANG Tian WANG Panfeng ZHAO Xueman | 2010 | CIRP Annals ManufacturingTeehnology2010，59，1： | 1 |
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