Evapotranspiration ratio of six major forest types in the Pearl River Delta was studied in this paper, and the six forest types included eucalyptus forest, fruit forest, coniferous forest, shrub forest, coniferous for...Evapotranspiration ratio of six major forest types in the Pearl River Delta was studied in this paper, and the six forest types included eucalyptus forest, fruit forest, coniferous forest, shrub forest, coniferous forest, and broad-leaved mixed for- est. The mechanism of PT-T model was analyzed based on Priestley-Taylor ex- tended model, and the result showed that land surface temperature or temperature difference between day and night could be used to evaluate the evapotranspiration factor. The evapotranspiration of 6 forest types was estimated with MODIS data and TM data and weather information during 2008-2009. The result suggested that water consumption of different forest differs insignificantly, and the EF of eucalyptus is not high.展开更多
General characteristics of Globicornis Latreille and a key of known subgenera of the genus are given. The new species G.（Globicornis） yushuensis sp. nov. from China（Qinghai Province） is described and illustrated.
The microfibril angle of seven poplar clones was determined by using X-ray diffraction technique. Microfibril angle, wood basic density, fiber length, fiber width and cellulose content were assessed for every growth r...The microfibril angle of seven poplar clones was determined by using X-ray diffraction technique. Microfibril angle, wood basic density, fiber length, fiber width and cellulose content were assessed for every growth ring at breast height for all sample trees. Significant variation in microfibril angle was observed among growth rings. Mean microfibril angle (MFA) at breast height varied from 7.8?to 28?between growth rings with cambial age and showed a consistent pith-to-bark trend of decline an-gles. Analysis of variance also indicated that there were significant differences in wood basic density, fiber length, fiber width and cellulose content between the growth rings, which had an increasing tendency from pith to bark. Correlations between MFA and examined wood properties were predominantly large and significant negative (?0.01), and the coefficients were -0.660 for cellulose content, -0.586 for fiber length, -0.516 for fiber width and -0.450 for wood basic density, respectively. Regression analysis with linear and curve estimation indicated that a quadratic function showed the largest R2 and the least standard error for describing the relationships between microfibril angle and measured wood properties, and the correlation coefficients were over -0.45 (n=125). The results from this study suggested that microfibril angle would be a good characteristic for improvement in the future breeding program of poplars.展开更多
The diagnosis and species distribution of the genus Eriotremex Benson,1943 is briefly reviewed.Two new Chinese species of Eriotremex are described and illustrated:E.decem Wei sp.nov.and E.shengi Wei sp.nov.Eriotremex ...The diagnosis and species distribution of the genus Eriotremex Benson,1943 is briefly reviewed.Two new Chinese species of Eriotremex are described and illustrated:E.decem Wei sp.nov.and E.shengi Wei sp.nov.Eriotremex serraticostatus(Xiao&Wu,1983)comb.nov.is transferred from Tremex Jurine.A key to the four known species of Eriotremex from China is provided.展开更多
基金Supported by Guangdong Hydrotechnics Innovation Project(2010484)National Natural Science Foundation of China(41201432)~~
文摘Evapotranspiration ratio of six major forest types in the Pearl River Delta was studied in this paper, and the six forest types included eucalyptus forest, fruit forest, coniferous forest, shrub forest, coniferous forest, and broad-leaved mixed for- est. The mechanism of PT-T model was analyzed based on Priestley-Taylor ex- tended model, and the result showed that land surface temperature or temperature difference between day and night could be used to evaluate the evapotranspiration factor. The evapotranspiration of 6 forest types was estimated with MODIS data and TM data and weather information during 2008-2009. The result suggested that water consumption of different forest differs insignificantly, and the EF of eucalyptus is not high.
基金supported by the National Natural Science Foundation of China(31501886)
文摘General characteristics of Globicornis Latreille and a key of known subgenera of the genus are given. The new species G.（Globicornis） yushuensis sp. nov. from China（Qinghai Province） is described and illustrated.
基金This research was supported by National Natural Science Foundation of China (Grant No. 30070616).
文摘The microfibril angle of seven poplar clones was determined by using X-ray diffraction technique. Microfibril angle, wood basic density, fiber length, fiber width and cellulose content were assessed for every growth ring at breast height for all sample trees. Significant variation in microfibril angle was observed among growth rings. Mean microfibril angle (MFA) at breast height varied from 7.8?to 28?between growth rings with cambial age and showed a consistent pith-to-bark trend of decline an-gles. Analysis of variance also indicated that there were significant differences in wood basic density, fiber length, fiber width and cellulose content between the growth rings, which had an increasing tendency from pith to bark. Correlations between MFA and examined wood properties were predominantly large and significant negative (?0.01), and the coefficients were -0.660 for cellulose content, -0.586 for fiber length, -0.516 for fiber width and -0.450 for wood basic density, respectively. Regression analysis with linear and curve estimation indicated that a quadratic function showed the largest R2 and the least standard error for describing the relationships between microfibril angle and measured wood properties, and the correlation coefficients were over -0.45 (n=125). The results from this study suggested that microfibril angle would be a good characteristic for improvement in the future breeding program of poplars.
基金supported by the National Natural Science Foundation of China(31970447)GDAS Special Project of Science and Technology Development(2020GDASYL-20200102021,2020GDASYL-20200301003)。
文摘The diagnosis and species distribution of the genus Eriotremex Benson,1943 is briefly reviewed.Two new Chinese species of Eriotremex are described and illustrated:E.decem Wei sp.nov.and E.shengi Wei sp.nov.Eriotremex serraticostatus(Xiao&Wu,1983)comb.nov.is transferred from Tremex Jurine.A key to the four known species of Eriotremex from China is provided.
