采用随机扩增多态DNA(RAPD)技术对黄渤海水域6个地理群(包括辽东湾、渤海湾、海州湾、乳山湾、海洋岛渔场及朝鲜半岛西海岸群)的中国对虾共114个个体进行了遗传多样性分析。筛选的13个随机引物共检测到96个位点(200～2500bp)，利用Popge...采用随机扩增多态DNA(RAPD)技术对黄渤海水域6个地理群(包括辽东湾、渤海湾、海州湾、乳山湾、海洋岛渔场及朝鲜半岛西海岸群)的中国对虾共114个个体进行了遗传多样性分析。筛选的13个随机引物共检测到96个位点(200～2500bp)，利用Popgene Version 1．31、TFPGA以及ARLEQUIN软件中的AMOVA进行分析。结果表明：中国对虾多态位点为25．00％～34．38％，Shannon信息指数(H0)为0．1476～0．1852，并按朝鲜半岛西海岸-乳山湾-海州湾-渤海湾-辽东湾-海洋岛渔场群顺序呈递减趋势；有超过3／4的遗传变异来自群体内；无论是遗传分化指数Gst、UPGMA聚类分析还是AMOVA群体间遗传分化ФST分析等，均证实中国对虾群体间存在着一定程度的遗传分化，即除RSB和HZB两群间的遗传分化很弱外(Gst=0．032、ФST=0．0255)，其余任意两群间的遗传分化达中等(Gst、ФST值均为0．05～0．15)或大的水平(Gst、ФST值均为O．15～O．25)。展开更多
How to restore the destroyed forest after forest fire is a key question that man must face. This paper reviewed the research situation and history on the forest restoration burned blanks and summed up the research met...How to restore the destroyed forest after forest fire is a key question that man must face. This paper reviewed the research situation and history on the forest restoration burned blanks and summed up the research methods used into four scales: seed-bank scale, community scale, ecosystem scale and landscape scale. The new technologies such as GIS & Remote Sensing used to vegetation restoration were also summarized. The strategies and developing trend of vegetation restoration research on burned blanks were discussed.展开更多
Crowd density is an important factor of crowd stability.Previous crowd density estimation methods are highly dependent on the specific video scene.This paper presented a video scene invariant crowd density estimation ...Crowd density is an important factor of crowd stability.Previous crowd density estimation methods are highly dependent on the specific video scene.This paper presented a video scene invariant crowd density estimation method using Geographic Information Systems(GIS) to monitor crowd size for large areas.The proposed method mapped crowd images to GIS.Then we can estimate crowd density for each camera in GIS using an estimation model obtained by one camera.Test results show that one model obtained by one camera in GIS can be adaptively applied to other cameras in outdoor video scenes.A real-time monitoring system for crowd size in large areas based on scene invariant model has been successfully used in 'Jiangsu Qinhuai Lantern Festival,2012'.It can provide early warning information and scientific basis for safety and security decision making.展开更多
文摘采用随机扩增多态DNA(RAPD)技术对黄渤海水域6个地理群(包括辽东湾、渤海湾、海州湾、乳山湾、海洋岛渔场及朝鲜半岛西海岸群)的中国对虾共114个个体进行了遗传多样性分析。筛选的13个随机引物共检测到96个位点(200～2500bp)，利用Popgene Version 1．31、TFPGA以及ARLEQUIN软件中的AMOVA进行分析。结果表明：中国对虾多态位点为25．00％～34．38％，Shannon信息指数(H0)为0．1476～0．1852，并按朝鲜半岛西海岸-乳山湾-海州湾-渤海湾-辽东湾-海洋岛渔场群顺序呈递减趋势；有超过3／4的遗传变异来自群体内；无论是遗传分化指数Gst、UPGMA聚类分析还是AMOVA群体间遗传分化ФST分析等，均证实中国对虾群体间存在着一定程度的遗传分化，即除RSB和HZB两群间的遗传分化很弱外(Gst=0．032、ФST=0．0255)，其余任意两群间的遗传分化达中等(Gst、ФST值均为0．05～0．15)或大的水平(Gst、ФST值均为O．15～O．25)。
文摘How to restore the destroyed forest after forest fire is a key question that man must face. This paper reviewed the research situation and history on the forest restoration burned blanks and summed up the research methods used into four scales: seed-bank scale, community scale, ecosystem scale and landscape scale. The new technologies such as GIS & Remote Sensing used to vegetation restoration were also summarized. The strategies and developing trend of vegetation restoration research on burned blanks were discussed.
基金The authors would like to thank the reviewers for their detailed reviews and constructive comments. We are also grateful for Sophie Song＇s help on the improving English. This work was supported in part by the ‘Fivetwelfh＇ National Science and Technology Support Program of the Ministry of Science and Technology of China （No. 2012BAH35B02）, the National Natural Science Foundation of China （NSFC） （No. 41401107, No. 41201402, and No. 41201417）.
文摘Crowd density is an important factor of crowd stability.Previous crowd density estimation methods are highly dependent on the specific video scene.This paper presented a video scene invariant crowd density estimation method using Geographic Information Systems(GIS) to monitor crowd size for large areas.The proposed method mapped crowd images to GIS.Then we can estimate crowd density for each camera in GIS using an estimation model obtained by one camera.Test results show that one model obtained by one camera in GIS can be adaptively applied to other cameras in outdoor video scenes.A real-time monitoring system for crowd size in large areas based on scene invariant model has been successfully used in 'Jiangsu Qinhuai Lantern Festival,2012'.It can provide early warning information and scientific basis for safety and security decision making.
