Carbon （C） dynamics are central to understanding ecosystem restoration effects within the context of Grain for Green Project （GGP）. GGP stared in China since 2003 to improve the environment. Despite its importance...Carbon （C） dynamics are central to understanding ecosystem restoration effects within the context of Grain for Green Project （GGP）. GGP stared in China since 2003 to improve the environment. Despite its importance, how total forest ecosystem C stock （FECS） develops fol- lowing land-use changes from cropland to plantation is poorly under- stood, in particular the relationship of C allocation to pools. We quanti- fied C pools in a chronosequence ranging from 0 to 48 years, using com- plete above- and below-ground harvests based on detailed field inventory Stands were chosen along a succession sequence in managed plantations of Korean larch （Larix olgensis Henry.）, a native planting species in the Lesser Khingan Mountains, Northeast of China. The FECS of Korean larch plantation （KLP） were dynamic across stand development, chang- ing from 88.2 Mg.ha-1 at cropland, to 183.9 Mg.ha·-1 as an average of forest C from 7- through 48-year-old plantation. In a 48-year-old mature KLP, vegetation comprises 48.63% of FECS and accounts for 67.66% of annual net C increment （ANCI）. Soil is responsible for 38.19% and 13.53% of those, and with the remainders of 13.18% and 18.81% in down woody materials. Based on comparisons of our estimate to those of others, we conclude that afforestation of Korean larch plantation is a valid approach to sequester carbon.展开更多
Quantifying forest stand parameters is crucial in forestry research and environmental monitoring because it provides important factors for analyzing forest structure and comprehending forest resources.And the estimati...Quantifying forest stand parameters is crucial in forestry research and environmental monitoring because it provides important factors for analyzing forest structure and comprehending forest resources.And the estimation of crown density and volume has always been a prominent topic in forestry remote sensing.Based on GF-2 remote sensing data,sample plot survey data and forest resource survey data,this study used the Chinese fir(Cunninghamia lanceolata(Lamb.)Hook.)and Pinus massoniana Lamb.as research objects to tackle the key challenges in the use of remote sensing technology.The Boruta feature selection technique,together with multiple stepwise and Cubist regression models,was used to estimate crown density and volume in portions of the research area’s stands,introducing novel technological methods for estimating stand parameters.The results show that:(i)the Boruta algorithm is effective at selecting the feature set with the strongest correlation with the dependent variable,which solves the problem of data and the loss of original feature data after dimensionality reduction;(ii)using the Cubist method to build the model yields better results than using multiple stepwise regression.The Cubist regression model’s coefficient of determination(R^(2))is all more than 0.67 in the Chinese fir plots and 0.63 in the P.massoniana plots.As a result,combining the two methods can increase the estimation accuracy of stand parameters,providing a theoretical foundation and technical support for future studies.展开更多
Platelet-rich plasma(PRP)can stimulate the proliferation of stem cells and have a positive effect on tissue repair.Although many commercialized PRP preparation kits are already on the market,first-line clinical worker...Platelet-rich plasma(PRP)can stimulate the proliferation of stem cells and have a positive effect on tissue repair.Although many commercialized PRP preparation kits are already on the market,first-line clinical workers are still not satisfied with most of the PRP kits.The work of commercial PRP kits is based on the density of blood elements.However,the blood elements are very close in density which makes the separation challenging.Therefore,the mentioned commercialized kits are generally contaminated by leucocytes and erythrocyte.In this study,a home-designed PRP device was developed to use a separation membrane with adequate cut-off pore size of 5μm,3μm and 2μm for the groups of H5M,H3M,and H2M,respectively,to be placed in the middle of the centrifuge tube.The home-designed H2M showed a very promising results regardless of the final volume(1.82±0.09 ml),platelet yield(8.39±0.44%),Red Blood Cells(0%),White Blood Cells(0%),and Relative Concentration of Platelet Increment value(225.09%).Further,it showed a good result in cell viability and cytotoxicity and confirmed a good multilineage potentials.The concentration in PRP prepared by group H2M was relatively stable and far above average.All the fibrin fibers were linked together as bridging strands or strings and turned into an inter-connected porous structure for nutrients transportation and regenerative cell migration.We believe that the home-designed group H2M should have a great potential to develop into the final product to meet the requirements of first-line clinical workers.展开更多
基金supported by the Special Public Interest Research and Industry Fund of Forestry(No.200904003-1)Project of Forestry Science and Technology Research(No.2012-07)the Importation of Foreign Advanced Agricultural Science and Technology Program(2008-4-48)
文摘Carbon （C） dynamics are central to understanding ecosystem restoration effects within the context of Grain for Green Project （GGP）. GGP stared in China since 2003 to improve the environment. Despite its importance, how total forest ecosystem C stock （FECS） develops fol- lowing land-use changes from cropland to plantation is poorly under- stood, in particular the relationship of C allocation to pools. We quanti- fied C pools in a chronosequence ranging from 0 to 48 years, using com- plete above- and below-ground harvests based on detailed field inventory Stands were chosen along a succession sequence in managed plantations of Korean larch （Larix olgensis Henry.）, a native planting species in the Lesser Khingan Mountains, Northeast of China. The FECS of Korean larch plantation （KLP） were dynamic across stand development, chang- ing from 88.2 Mg.ha-1 at cropland, to 183.9 Mg.ha·-1 as an average of forest C from 7- through 48-year-old plantation. In a 48-year-old mature KLP, vegetation comprises 48.63% of FECS and accounts for 67.66% of annual net C increment （ANCI）. Soil is responsible for 38.19% and 13.53% of those, and with the remainders of 13.18% and 18.81% in down woody materials. Based on comparisons of our estimate to those of others, we conclude that afforestation of Korean larch plantation is a valid approach to sequester carbon.
基金supported by the project of the National Technology Extension Fund of Forestry,‘Forest Vegetation Carbon Storage Monitoring Technology Based on Watershed Algorithm’([2019]06)the National Natural Science Foundation of China,‘Study on Crown Models for Larix olgensis Based on Tree Growth’(31870620).
文摘Quantifying forest stand parameters is crucial in forestry research and environmental monitoring because it provides important factors for analyzing forest structure and comprehending forest resources.And the estimation of crown density and volume has always been a prominent topic in forestry remote sensing.Based on GF-2 remote sensing data,sample plot survey data and forest resource survey data,this study used the Chinese fir(Cunninghamia lanceolata(Lamb.)Hook.)and Pinus massoniana Lamb.as research objects to tackle the key challenges in the use of remote sensing technology.The Boruta feature selection technique,together with multiple stepwise and Cubist regression models,was used to estimate crown density and volume in portions of the research area’s stands,introducing novel technological methods for estimating stand parameters.The results show that:(i)the Boruta algorithm is effective at selecting the feature set with the strongest correlation with the dependent variable,which solves the problem of data and the loss of original feature data after dimensionality reduction;(ii)using the Cubist method to build the model yields better results than using multiple stepwise regression.The Cubist regression model’s coefficient of determination(R^(2))is all more than 0.67 in the Chinese fir plots and 0.63 in the P.massoniana plots.As a result,combining the two methods can increase the estimation accuracy of stand parameters,providing a theoretical foundation and technical support for future studies.
基金This work was supported by the Indonesia Endowment Fund for Education(LPDP)within the ministry of Finance,Indonesia(grant number PRJ-317/LPDP.3/2016).
文摘Platelet-rich plasma(PRP)can stimulate the proliferation of stem cells and have a positive effect on tissue repair.Although many commercialized PRP preparation kits are already on the market,first-line clinical workers are still not satisfied with most of the PRP kits.The work of commercial PRP kits is based on the density of blood elements.However,the blood elements are very close in density which makes the separation challenging.Therefore,the mentioned commercialized kits are generally contaminated by leucocytes and erythrocyte.In this study,a home-designed PRP device was developed to use a separation membrane with adequate cut-off pore size of 5μm,3μm and 2μm for the groups of H5M,H3M,and H2M,respectively,to be placed in the middle of the centrifuge tube.The home-designed H2M showed a very promising results regardless of the final volume(1.82±0.09 ml),platelet yield(8.39±0.44%),Red Blood Cells(0%),White Blood Cells(0%),and Relative Concentration of Platelet Increment value(225.09%).Further,it showed a good result in cell viability and cytotoxicity and confirmed a good multilineage potentials.The concentration in PRP prepared by group H2M was relatively stable and far above average.All the fibrin fibers were linked together as bridging strands or strings and turned into an inter-connected porous structure for nutrients transportation and regenerative cell migration.We believe that the home-designed group H2M should have a great potential to develop into the final product to meet the requirements of first-line clinical workers.
