Drought monitoring is the base for drought coping and adaptation. Xingtai is located in North China＇s key winter wheat production areas where drought is severe and frequent. The rainfall during winter wheat growing s...Drought monitoring is the base for drought coping and adaptation. Xingtai is located in North China＇s key winter wheat production areas where drought is severe and frequent. The rainfall during winter wheat growing season is just about 1/3 of total demand. Xingtai has typical mountainous, hilly and plain agricultural zones, compound rain-fed and irrigated farming patterns. The winter wheat irrigation has heavily depended on overdraw of groundwater in recent decades. In the study, the MODIS （Moderate-Resolution Imaging Spectroradiometer） images taken at the key winter wheat growing season （Mar. to May） in normal rainfall year （2006） were selected, extracted NDVI （Normalized Difference Vegetation Index） and LST （Land Surface Temperature） data, calculated TVDI （Temperature and Vegetation Drought Index）, classified and mapped winter wheat drought intensity. Further, based on TVDI, a CDRA （Comprehensive Drought Risk Assessment） model for winter wheat drought disaster risk assessment was constructed and zoning was made. Verified by winter wheat yield, the risk zoning by CDRA is consistent with actual crop failure space. This method can be used in drought risk management.展开更多
为了解2011～2012年河北省急性弛缓性麻痹（Acute flaccid paralysis，AFP）病例中非脊髓灰质炎肠道病毒（Non-polio enterovirus，NPEV）的血清型分布，探讨这些病毒与AFP的关系，本研究按照世界卫生组织要求，对河北省AFP病例粪便标...为了解2011～2012年河北省急性弛缓性麻痹（Acute flaccid paralysis，AFP）病例中非脊髓灰质炎肠道病毒（Non-polio enterovirus，NPEV）的血清型分布，探讨这些病毒与AFP的关系，本研究按照世界卫生组织要求，对河北省AFP病例粪便标本利用人横纹肌肉瘤（Human rhabdomyosarcoma，RD）细胞和转人脊髓灰质炎病毒受体的小鼠肺（Mouse cell line expressing the gene for the human cellular receptor for poliovirus，L20B）细胞进行病毒分离。筛检出NPEV毒株后，进行VP1区核苷酸序列测定，使用分子定型方法对NPEV进行血清型别鉴定。结果显示，在2011-2012年AFP病例中分离到的82株NPEV中共鉴定出A组人肠道病毒（HEV-A）42株（55．3％），包含4个血清型；B组人肠道病毒（HEV-B）34株（44．7％），包含13个血清型别，未鉴定出c组和D组人肠道病毒。另外还有2株腺病毒，4株未定型NPEV。HEV—A组中又以肠道病毒71型（EV-A71）为主要型别，在HEV-A中比例高达85．7％。2011-2012年河北省AFP病例中分离到的NPEV以HEV-A居多，尤其是EV-A71，为AFP病例中的优势毒株。展开更多
基金The study was supported by the National Natural Science Foundation of China [No.46171501 ].
文摘Drought monitoring is the base for drought coping and adaptation. Xingtai is located in North China＇s key winter wheat production areas where drought is severe and frequent. The rainfall during winter wheat growing season is just about 1/3 of total demand. Xingtai has typical mountainous, hilly and plain agricultural zones, compound rain-fed and irrigated farming patterns. The winter wheat irrigation has heavily depended on overdraw of groundwater in recent decades. In the study, the MODIS （Moderate-Resolution Imaging Spectroradiometer） images taken at the key winter wheat growing season （Mar. to May） in normal rainfall year （2006） were selected, extracted NDVI （Normalized Difference Vegetation Index） and LST （Land Surface Temperature） data, calculated TVDI （Temperature and Vegetation Drought Index）, classified and mapped winter wheat drought intensity. Further, based on TVDI, a CDRA （Comprehensive Drought Risk Assessment） model for winter wheat drought disaster risk assessment was constructed and zoning was made. Verified by winter wheat yield, the risk zoning by CDRA is consistent with actual crop failure space. This method can be used in drought risk management.
文摘为了解2011～2012年河北省急性弛缓性麻痹（Acute flaccid paralysis，AFP）病例中非脊髓灰质炎肠道病毒（Non-polio enterovirus，NPEV）的血清型分布，探讨这些病毒与AFP的关系，本研究按照世界卫生组织要求，对河北省AFP病例粪便标本利用人横纹肌肉瘤（Human rhabdomyosarcoma，RD）细胞和转人脊髓灰质炎病毒受体的小鼠肺（Mouse cell line expressing the gene for the human cellular receptor for poliovirus，L20B）细胞进行病毒分离。筛检出NPEV毒株后，进行VP1区核苷酸序列测定，使用分子定型方法对NPEV进行血清型别鉴定。结果显示，在2011-2012年AFP病例中分离到的82株NPEV中共鉴定出A组人肠道病毒（HEV-A）42株（55．3％），包含4个血清型；B组人肠道病毒（HEV-B）34株（44．7％），包含13个血清型别，未鉴定出c组和D组人肠道病毒。另外还有2株腺病毒，4株未定型NPEV。HEV—A组中又以肠道病毒71型（EV-A71）为主要型别，在HEV-A中比例高达85．7％。2011-2012年河北省AFP病例中分离到的NPEV以HEV-A居多，尤其是EV-A71，为AFP病例中的优势毒株。
