The main purpose of this study is to put forward a reasonable idea of the general protection for Singing Sand Moun- tain and Crescent Moon Spring, a rare and unique desert wonder, and of sustainable tourism developmen...The main purpose of this study is to put forward a reasonable idea of the general protection for Singing Sand Moun- tain and Crescent Moon Spring, a rare and unique desert wonder, and of sustainable tourism development based on the research on the ecological environment around. Methods of documentation, case study and comparison were employed. Finally, aiming at solving the problems of natural environment and those existing after the exploitation of Singing Sand Mountain and Crescent Moon Spring the author puts forward three measures: the com- prehensive treatment for Crescent Moon Spring (broadening re- sources of water and reducing expenditures, checking the de- creasing depth of Crescent Moon Spring, and improving the geo- graphical environment), the general protection envisions for Singing Sand Mountain and Crescent Moon Spring and establish- ing a dynamic monitoring and early-warning system of regional ecosystem.展开更多
Black locust (Robinia pseudoacacia L.) was the first forest tree species to be imported from North America to Europe at the beginning of the 17th century. It is the most important fast-growing stand-forming tree speci...Black locust (Robinia pseudoacacia L.) was the first forest tree species to be imported from North America to Europe at the beginning of the 17th century. It is the most important fast-growing stand-forming tree species in Hungary. Black locust planta-tions can be successfully established in response to a range of economic and ecological opportunities. Plantation survival and productivity are maximized by matching the species' growth characteristics with silvicultural options and land management needs. In the paper the sequence of forest tending operations in black locust stands is proposed, based on results of long-term stand structure and forest yield trials. Implementing good silvicultural plans and models will lead to profitable black locust stands and greater ac-ceptance of the species by land managers. Black locust would also be a very useful species for energy productions as the related research results have been shown in the paper.展开更多
This paper presents an overview and analyzes the impact of the Partido Renacimientoy Union de Espana （PRUNE, Renascence Party and Union in Spain） specifying in the socio-political articulation of Muslims in Spain. I...This paper presents an overview and analyzes the impact of the Partido Renacimientoy Union de Espana （PRUNE, Renascence Party and Union in Spain） specifying in the socio-political articulation of Muslims in Spain. In particular, it aims to describe and analyze the historical and political context of the emergence of these types of parties in the European Union （EU）; their background in Spain, particularly in the Autonomous Cities of Ceuta and Melilla and their specific impact on socio-political movements. The main hypotheses of work are the heterogeneity of Islamic communities in Spain, its religious references and social integration are difficult and complex, implying that this will provide a strategic impact from PRUNE, which could be very limited, slow, and uncertain.展开更多
Abundant perfectly-preserved phosphatic microspherules have been discovered across the Frasnian-Famennian （F-F） transition from the Yangdi section in Guilin, Guangxi, South China. They are mostly spherical or ellipt...Abundant perfectly-preserved phosphatic microspherules have been discovered across the Frasnian-Famennian （F-F） transition from the Yangdi section in Guilin, Guangxi, South China. They are mostly spherical or elliptical in shape and about 150 gin in diameter with smooth exterior surfaces. Each microspherule consistently possesses a small dimple on the surface. The internal texture of microspherules consists of concentric light-colored apatite and dark-colored organic matter bands alternating around a central core. Conodonts have also been found preserved together with phosphatic microspherules in the same horizon, and the abundance of the former is obviously higher than that of the latter. Laser Raman spectral studies show close similarities in spectral patterns between the outer shells of phosphatic microspherules and the blade of the conodont genus Palmatolepis sp., as well as between the microspherule nucleus and the platform of the same conodont genus. Furthermore, the statistical results and geochemical data demonstrate that the elevated abundance of phosphatic microspherules roughly coincides with the blooms of bacteria and algae, but is later than the sharp increase of oceanic nutrients. The phosphatic microspherules are inter- preted here to be the ＇otoliths＇ secreted by conodont animals based on the compositional similarities between phosphatic mi- crospherules and conodonts and their interrelated abundances. In addition, an analogous study reveals morphological and tex- tural similarities between fish otoliths and phosphatic microspherules. The formation of phosphatic microspherules is probably related to seawater eutrophication. We speculate that the explosive growth of bacteria and algae is probably caused by the en- richment of nutrients that is most likely associated with the increase of terrestrial inputs, submarine hydrothermal activities or the upwelling anoxic bottom waters in the late Devonian, which would stimulate the conodont animals to secrete phosphatic microspherules--the ＇otoliths＇ of conodont animals. This study reveals the coupling relationship between organisms and envi- ronments from the perspective of phosphatic microspherules and provides new evidence for the cause of faunal crisis during the Late Devonian F-F transition.展开更多
This study aims to assess the impact of monospecific Tectona grandis forest plantation on the soil mite abundance and diversity. To achieve these objectives, two sites situated in Ivory Coast were investigated. The fi...This study aims to assess the impact of monospecific Tectona grandis forest plantation on the soil mite abundance and diversity. To achieve these objectives, two sites situated in Ivory Coast were investigated. The first, a primary forest was characterized by a very weak human activities whereas the second, a teak plantation was characterized by a high disturbance performed during the planting. After extracting, sorted and description, 116 mite species were described in the two sites. Mite densities were lower in teak plantation and also higher in the litter and decreased to the depth in both sites. Species richness re- corded in teak plantation （52 species） was significantly lower compared to primary forest （98 species）. The same trend was ob- served for Oribatida but not for Gamasida. The lower Oribatida （5 vs. 17） and higher Oribatida （24 vs. 41） were recorded respec- tively in teak plantation and primary forest. Mite Shannon index and evenness were significantly different between sites. High Jaccard index values and the appearance of exclusive species in both habitats showed that the sites are very distinct. Total number of species recorded corresponded to 58%-63% of the total number of species estimated by ACE and Chao 1＆2 estimators, indi- cating that the sampling effort was not sufficient. Mite abundance and diversity varied depending on the characteristics of habi- tats. Chemical element （Corn, Ctot, Ntot, and SOM） values were lower in teak plantation （disturbed habitat） and significantly dif- ferent to primary forest in the topsoil. Apart from litter height, soil depth, pH and C/N ratio, others variables were strongly corre- lated to mite abundance and diversity [Current Zoology 59 （5）： 633-643, 2013].展开更多
文摘The main purpose of this study is to put forward a reasonable idea of the general protection for Singing Sand Moun- tain and Crescent Moon Spring, a rare and unique desert wonder, and of sustainable tourism development based on the research on the ecological environment around. Methods of documentation, case study and comparison were employed. Finally, aiming at solving the problems of natural environment and those existing after the exploitation of Singing Sand Mountain and Crescent Moon Spring the author puts forward three measures: the com- prehensive treatment for Crescent Moon Spring (broadening re- sources of water and reducing expenditures, checking the de- creasing depth of Crescent Moon Spring, and improving the geo- graphical environment), the general protection envisions for Singing Sand Mountain and Crescent Moon Spring and establish- ing a dynamic monitoring and early-warning system of regional ecosystem.
文摘Black locust (Robinia pseudoacacia L.) was the first forest tree species to be imported from North America to Europe at the beginning of the 17th century. It is the most important fast-growing stand-forming tree species in Hungary. Black locust planta-tions can be successfully established in response to a range of economic and ecological opportunities. Plantation survival and productivity are maximized by matching the species' growth characteristics with silvicultural options and land management needs. In the paper the sequence of forest tending operations in black locust stands is proposed, based on results of long-term stand structure and forest yield trials. Implementing good silvicultural plans and models will lead to profitable black locust stands and greater ac-ceptance of the species by land managers. Black locust would also be a very useful species for energy productions as the related research results have been shown in the paper.
文摘This paper presents an overview and analyzes the impact of the Partido Renacimientoy Union de Espana （PRUNE, Renascence Party and Union in Spain） specifying in the socio-political articulation of Muslims in Spain. In particular, it aims to describe and analyze the historical and political context of the emergence of these types of parties in the European Union （EU）; their background in Spain, particularly in the Autonomous Cities of Ceuta and Melilla and their specific impact on socio-political movements. The main hypotheses of work are the heterogeneity of Islamic communities in Spain, its religious references and social integration are difficult and complex, implying that this will provide a strategic impact from PRUNE, which could be very limited, slow, and uncertain.
基金supported by National Basic Research Program of China (Grant No. 2011CB808800)National Natural Science Foundation of China (Grant Nos. 41290260, 41072252)Doctoral Fund of Ministry of Education of China (Grant No. 20120145110012)
文摘Abundant perfectly-preserved phosphatic microspherules have been discovered across the Frasnian-Famennian （F-F） transition from the Yangdi section in Guilin, Guangxi, South China. They are mostly spherical or elliptical in shape and about 150 gin in diameter with smooth exterior surfaces. Each microspherule consistently possesses a small dimple on the surface. The internal texture of microspherules consists of concentric light-colored apatite and dark-colored organic matter bands alternating around a central core. Conodonts have also been found preserved together with phosphatic microspherules in the same horizon, and the abundance of the former is obviously higher than that of the latter. Laser Raman spectral studies show close similarities in spectral patterns between the outer shells of phosphatic microspherules and the blade of the conodont genus Palmatolepis sp., as well as between the microspherule nucleus and the platform of the same conodont genus. Furthermore, the statistical results and geochemical data demonstrate that the elevated abundance of phosphatic microspherules roughly coincides with the blooms of bacteria and algae, but is later than the sharp increase of oceanic nutrients. The phosphatic microspherules are inter- preted here to be the ＇otoliths＇ secreted by conodont animals based on the compositional similarities between phosphatic mi- crospherules and conodonts and their interrelated abundances. In addition, an analogous study reveals morphological and tex- tural similarities between fish otoliths and phosphatic microspherules. The formation of phosphatic microspherules is probably related to seawater eutrophication. We speculate that the explosive growth of bacteria and algae is probably caused by the en- richment of nutrients that is most likely associated with the increase of terrestrial inputs, submarine hydrothermal activities or the upwelling anoxic bottom waters in the late Devonian, which would stimulate the conodont animals to secrete phosphatic microspherules--the ＇otoliths＇ of conodont animals. This study reveals the coupling relationship between organisms and envi- ronments from the perspective of phosphatic microspherules and provides new evidence for the cause of faunal crisis during the Late Devonian F-F transition.
文摘This study aims to assess the impact of monospecific Tectona grandis forest plantation on the soil mite abundance and diversity. To achieve these objectives, two sites situated in Ivory Coast were investigated. The first, a primary forest was characterized by a very weak human activities whereas the second, a teak plantation was characterized by a high disturbance performed during the planting. After extracting, sorted and description, 116 mite species were described in the two sites. Mite densities were lower in teak plantation and also higher in the litter and decreased to the depth in both sites. Species richness re- corded in teak plantation （52 species） was significantly lower compared to primary forest （98 species）. The same trend was ob- served for Oribatida but not for Gamasida. The lower Oribatida （5 vs. 17） and higher Oribatida （24 vs. 41） were recorded respec- tively in teak plantation and primary forest. Mite Shannon index and evenness were significantly different between sites. High Jaccard index values and the appearance of exclusive species in both habitats showed that the sites are very distinct. Total number of species recorded corresponded to 58%-63% of the total number of species estimated by ACE and Chao 1＆2 estimators, indi- cating that the sampling effort was not sufficient. Mite abundance and diversity varied depending on the characteristics of habi- tats. Chemical element （Corn, Ctot, Ntot, and SOM） values were lower in teak plantation （disturbed habitat） and significantly dif- ferent to primary forest in the topsoil. Apart from litter height, soil depth, pH and C/N ratio, others variables were strongly corre- lated to mite abundance and diversity [Current Zoology 59 （5）： 633-643, 2013].
