[Objective] The aim was to provide a reference for studying the resistant ability of subtropical forest to freeze disaster and detecting the recovery and evolution of Huodendron biaristatum species after freeze disast...[Objective] The aim was to provide a reference for studying the resistant ability of subtropical forest to freeze disaster and detecting the recovery and evolution of Huodendron biaristatum species after freeze disaster.[Method] Effects of the damage caused by the southern ice storm in early 2008 on Huodendron biaristatum,dominant species of evergreen broad-leaved forest on the Damingshan,were studied in the aspect of population ecology.[Result] Among the 1 090 Huodendron biaristatum individuals （DBH ≥ 1 cm）,697 individuals were victims,accounting for 63.9%.The largest part of the victims was crown breakdown,which took up 37.6%.13.0% of the victims were bent,and 10.2% of the victims were trunk broken.The least part of the victims were uprooted,accounting for only 3.1%.Different types and extent of forestry damage had remarkable differences in diameter class,tree height,crown and taper.Rates of damage and crown breakdown increased with the increase of DBH,while bent rate decreased.Rates of damage,bent and trunk broken declined slowly with the increase of tree height,while crown breakdown rate followed the normal distribution.As the crown level increased,rates of damage and crown breakdown increased,while the rate of trunk broken decreased.Individuals with high taper were more susceptible to crown damage,bending,breaking and uprooted.[Conclusion] The resistant ability of Huodendron biaristatum species to freeze disaster is affected by many factors like DBH,tree height,crown,taper,etc..Huodendron biaristatum species in Damingshan affected by those factors show various kinds of damaged types dominant by mechanical damage,but there is few individual to die.展开更多
利用CAMP/Tibet中CEOP-EOP3改则站2002年10月—2003年9月的观测资料作为强迫场,运用陆面过程模式CoLM(Common Land Model),对青藏高原西部陆面特征的模拟研究表明,在高原西部地表能量平衡过程中,冬半年,感热通量占主要地位,潜热通量较小...利用CAMP/Tibet中CEOP-EOP3改则站2002年10月—2003年9月的观测资料作为强迫场,运用陆面过程模式CoLM(Common Land Model),对青藏高原西部陆面特征的模拟研究表明,在高原西部地表能量平衡过程中,冬半年,感热通量占主要地位,潜热通量较小;尤其在冻结期,潜热通量几乎等于零。但在高原西部的融冻期,潜热通量有显著变化。在干季向湿季转化时段的5月中下旬,表层土壤由于融冻而引起的频繁水分相变,使得潜热通量随之变化并开始增加,Bowen比由大变小。地表有效通量的变化与降水及土壤表层频繁的冻结—消融相联系。展开更多
目的:观察人脐血在不同温区保存时粒-单系造血祖细胞(CFU-GM)的损伤情况及有效地长期深低温保存的可行性。方法:采用传统的室温制备—程序降温—液氮保存方法,观察脐血造血细胞活力及 CFU-GM 产率。结果:在室温存放12 h 不受影响,而-8℃...目的:观察人脐血在不同温区保存时粒-单系造血祖细胞(CFU-GM)的损伤情况及有效地长期深低温保存的可行性。方法:采用传统的室温制备—程序降温—液氮保存方法,观察脐血造血细胞活力及 CFU-GM 产率。结果:在室温存放12 h 不受影响,而-8℃、-20℃温区存放12 h 其活力及产率下降,产率分别比冻存前减少了15.5%和38.1%,-30℃温区继续下降,而-80%温区未再进一步降低。液氮中不同时间-80℃保存不会进一步降低 CFU-GM 产率。结论:-8℃～-30℃之间是冻存损伤造血祖细胞主要的危险区,而液氮中长期深低温保存不会进一步损伤脐血造血祖细胞。故-80℃冻存脐血比较合适。展开更多
基金Support by National Natural Science Foundation of China(30860059)~~
文摘[Objective] The aim was to provide a reference for studying the resistant ability of subtropical forest to freeze disaster and detecting the recovery and evolution of Huodendron biaristatum species after freeze disaster.[Method] Effects of the damage caused by the southern ice storm in early 2008 on Huodendron biaristatum,dominant species of evergreen broad-leaved forest on the Damingshan,were studied in the aspect of population ecology.[Result] Among the 1 090 Huodendron biaristatum individuals （DBH ≥ 1 cm）,697 individuals were victims,accounting for 63.9%.The largest part of the victims was crown breakdown,which took up 37.6%.13.0% of the victims were bent,and 10.2% of the victims were trunk broken.The least part of the victims were uprooted,accounting for only 3.1%.Different types and extent of forestry damage had remarkable differences in diameter class,tree height,crown and taper.Rates of damage and crown breakdown increased with the increase of DBH,while bent rate decreased.Rates of damage,bent and trunk broken declined slowly with the increase of tree height,while crown breakdown rate followed the normal distribution.As the crown level increased,rates of damage and crown breakdown increased,while the rate of trunk broken decreased.Individuals with high taper were more susceptible to crown damage,bending,breaking and uprooted.[Conclusion] The resistant ability of Huodendron biaristatum species to freeze disaster is affected by many factors like DBH,tree height,crown,taper,etc..Huodendron biaristatum species in Damingshan affected by those factors show various kinds of damaged types dominant by mechanical damage,but there is few individual to die.
文摘利用CAMP/Tibet中CEOP-EOP3改则站2002年10月—2003年9月的观测资料作为强迫场,运用陆面过程模式CoLM(Common Land Model),对青藏高原西部陆面特征的模拟研究表明,在高原西部地表能量平衡过程中,冬半年,感热通量占主要地位,潜热通量较小;尤其在冻结期,潜热通量几乎等于零。但在高原西部的融冻期,潜热通量有显著变化。在干季向湿季转化时段的5月中下旬,表层土壤由于融冻而引起的频繁水分相变,使得潜热通量随之变化并开始增加,Bowen比由大变小。地表有效通量的变化与降水及土壤表层频繁的冻结—消融相联系。
文摘目的:观察人脐血在不同温区保存时粒-单系造血祖细胞(CFU-GM)的损伤情况及有效地长期深低温保存的可行性。方法:采用传统的室温制备—程序降温—液氮保存方法,观察脐血造血细胞活力及 CFU-GM 产率。结果:在室温存放12 h 不受影响,而-8℃、-20℃温区存放12 h 其活力及产率下降,产率分别比冻存前减少了15.5%和38.1%,-30℃温区继续下降,而-80%温区未再进一步降低。液氮中不同时间-80℃保存不会进一步降低 CFU-GM 产率。结论:-8℃～-30℃之间是冻存损伤造血祖细胞主要的危险区,而液氮中长期深低温保存不会进一步损伤脐血造血祖细胞。故-80℃冻存脐血比较合适。
