Huanghua depression,in the middle of Bohai Bay basin,is a major secondary sedimentary and petroliferous unit.Although this basin has been explored for nearly 50 years,the discovery of new reservoirs increased quickly ...Huanghua depression,in the middle of Bohai Bay basin,is a major secondary sedimentary and petroliferous unit.Although this basin has been explored for nearly 50 years,the discovery of new reservoirs increased quickly in recent years.The subduction of the Pacific Plate to the Eurasia Plate caused the transtensional deformation of the whole basin.During the Paleogene,the depocenters and subsidence centers展开更多
The assessment of ecological status for running waters is one of the major issues within an integrated river basin management and plays a key role with respect to the implementation of the European Water Frame- work D...The assessment of ecological status for running waters is one of the major issues within an integrated river basin management and plays a key role with respect to the implementation of the European Water Frame- work Directive (WFD).One of the tools supporting the development of sustainable river management is physi- cal habitat modeling,e.g.,for fish,because fish population are one of the most important indicators for the e- colngical integrity of rivers.Within physical habitat models hydromorphological ...展开更多
Leymus chinensis （Trin.） Tzvel is the characteristic of the Eastern Asia, and is a perennial herbaceous rhizome species on L. chinensis steppe of the Northern China, the Eastern Mongolia, and area of Outer-Baikal of...Leymus chinensis （Trin.） Tzvel is the characteristic of the Eastern Asia, and is a perennial herbaceous rhizome species on L. chinensis steppe of the Northern China, the Eastern Mongolia, and area of Outer-Baikal of Russia. It has both vegetative and sexual reproductions, and results in complexity of the population structure. Thus, it is difficult to identify distinct clones. Author used the randomly amplified polymorphic DNA （RAPD） technique to identify the clonal structure of heterogeneous and homogeneous habitats in two populations ofLeymus chinensis, analyzed 260 ramets samples using 12 primers and 60 polymorphie markers （reproducible RAPD bands）. The results proved elonal diversity described using PD, D, and E was higher in the HCS habitat than that in the HPS habitat. The PD, D, and E in the HCS of Songzhan population were 0.21, 0.90, and 0.91, respectively, whereas the PD, D, and E in the HPS of Songzhan population were only 0.09, 0.68, and 0.77, respectively; the PD, D, and E in the HCS of Yongle population were 0.19, 0.92 mad 0.90, respectively, correspondingly, these measures in the HPS of Yongle population were only 0.09, 0.63, and 0.79, respectively. The results also indicated that clonal population ofL. chinensis in HPS habitat had lower genetic dissimilarity index than that in the HCS habitat.展开更多
【目的】预测当前及未来气候情景下黑刺粉虱在中国的适生分布范围及适生等级,分析环境变量对其分布的影响,明确主导气候因子,为茶园黑刺粉虱的监测预警和科学防控提供理论依据和实践指导。【方法】基于MaxEnt模型与ArcGIS软件,预测黑刺...【目的】预测当前及未来气候情景下黑刺粉虱在中国的适生分布范围及适生等级,分析环境变量对其分布的影响,明确主导气候因子,为茶园黑刺粉虱的监测预警和科学防控提供理论依据和实践指导。【方法】基于MaxEnt模型与ArcGIS软件,预测黑刺粉虱的适生分布范围及其适生程度,并采用刀切法(Jackknife)评估影响其潜在分布的主要环境变量。【结果】MaxEnt模型预测的曲线下面积AUC(area under curve,AUC)值为0.894,表明模型精度较高,预测结果可靠。利用刀切法分析显示,影响黑刺粉虱潜在分布的主要环境变量为年平均温(bio1)、年平均降水量(bio12)和最干月份降水量(bio14)。在当前及未来气候情景下,黑刺粉虱的适生区广泛分布于我国大部分省份,其中高适生区主要集中在我国秦岭-淮河以南地区,适生程度由南向北逐渐递减。当前黑刺粉虱总适生区面积为277.49万km^(2),占国土面积的28.91%;其中高适生区面积占比最大,为116.21万km^(2),占总适生区面积的41.88%。【结论】在未来多种气候情景下,黑刺粉虱在我国的分布范围呈现北移趋势,适生面积略有增加,但总体分布范围和适生程度未发生明显变化,表现出较强的稳定性。鉴于黑刺粉虱在中国适生区范围广泛,建议加强监测预警和区域防控,以保障茶叶安全生产和品质提升。展开更多
文摘Huanghua depression,in the middle of Bohai Bay basin,is a major secondary sedimentary and petroliferous unit.Although this basin has been explored for nearly 50 years,the discovery of new reservoirs increased quickly in recent years.The subduction of the Pacific Plate to the Eurasia Plate caused the transtensional deformation of the whole basin.During the Paleogene,the depocenters and subsidence centers
文摘The assessment of ecological status for running waters is one of the major issues within an integrated river basin management and plays a key role with respect to the implementation of the European Water Frame- work Directive (WFD).One of the tools supporting the development of sustainable river management is physi- cal habitat modeling,e.g.,for fish,because fish population are one of the most important indicators for the e- colngical integrity of rivers.Within physical habitat models hydromorphological ...
基金Supported by the National Natural Foundation of China (30670336, 30870423, 30870391)
文摘Leymus chinensis （Trin.） Tzvel is the characteristic of the Eastern Asia, and is a perennial herbaceous rhizome species on L. chinensis steppe of the Northern China, the Eastern Mongolia, and area of Outer-Baikal of Russia. It has both vegetative and sexual reproductions, and results in complexity of the population structure. Thus, it is difficult to identify distinct clones. Author used the randomly amplified polymorphic DNA （RAPD） technique to identify the clonal structure of heterogeneous and homogeneous habitats in two populations ofLeymus chinensis, analyzed 260 ramets samples using 12 primers and 60 polymorphie markers （reproducible RAPD bands）. The results proved elonal diversity described using PD, D, and E was higher in the HCS habitat than that in the HPS habitat. The PD, D, and E in the HCS of Songzhan population were 0.21, 0.90, and 0.91, respectively, whereas the PD, D, and E in the HPS of Songzhan population were only 0.09, 0.68, and 0.77, respectively; the PD, D, and E in the HCS of Yongle population were 0.19, 0.92 mad 0.90, respectively, correspondingly, these measures in the HPS of Yongle population were only 0.09, 0.63, and 0.79, respectively. The results also indicated that clonal population ofL. chinensis in HPS habitat had lower genetic dissimilarity index than that in the HCS habitat.
文摘【目的】预测当前及未来气候情景下黑刺粉虱在中国的适生分布范围及适生等级,分析环境变量对其分布的影响,明确主导气候因子,为茶园黑刺粉虱的监测预警和科学防控提供理论依据和实践指导。【方法】基于MaxEnt模型与ArcGIS软件,预测黑刺粉虱的适生分布范围及其适生程度,并采用刀切法(Jackknife)评估影响其潜在分布的主要环境变量。【结果】MaxEnt模型预测的曲线下面积AUC(area under curve,AUC)值为0.894,表明模型精度较高,预测结果可靠。利用刀切法分析显示,影响黑刺粉虱潜在分布的主要环境变量为年平均温(bio1)、年平均降水量(bio12)和最干月份降水量(bio14)。在当前及未来气候情景下,黑刺粉虱的适生区广泛分布于我国大部分省份,其中高适生区主要集中在我国秦岭-淮河以南地区,适生程度由南向北逐渐递减。当前黑刺粉虱总适生区面积为277.49万km^(2),占国土面积的28.91%;其中高适生区面积占比最大,为116.21万km^(2),占总适生区面积的41.88%。【结论】在未来多种气候情景下,黑刺粉虱在我国的分布范围呈现北移趋势,适生面积略有增加,但总体分布范围和适生程度未发生明显变化,表现出较强的稳定性。鉴于黑刺粉虱在中国适生区范围广泛,建议加强监测预警和区域防控,以保障茶叶安全生产和品质提升。
