期刊文献+
共找到3篇文章
< 1 >
每页显示 20 50 100
对云南中北部粳稻品比试验材料的相关性分析及灰色关联综合评价
1
作者 单艳 陈于敏 +4 位作者 赵国珍 俞顺武 赵应平 世荣 苏振喜 《农业科技通讯》 2016年第6期178-184,共7页
在杂交水稻育种工作中,少不了要进行不同品种组合的测配与筛选。本文对13个云南中北部粳稻品比试验材料的12个性状采用相关性分析和灰色关联度分析法进行综合分析评价。结果表明:Mannabyeo/丽粳11号组合关联度最大,ri=0.699 1;其次是凤... 在杂交水稻育种工作中,少不了要进行不同品种组合的测配与筛选。本文对13个云南中北部粳稻品比试验材料的12个性状采用相关性分析和灰色关联度分析法进行综合分析评价。结果表明:Mannabyeo/丽粳11号组合关联度最大,ri=0.699 1;其次是凤稻23号,ri=0.648 4;第三是云粳37号/云粳31号,ri=0.597 8;最小的组合是Sambaekbyeo/云粳31号(2013KB2),ri=0.448 2。依据综合评价结果,以期达到优中选优的目的,最终筛选出优异的新品系参加区域试验。 展开更多
关键词 品比试验 云南中北部 粳稻 相关性分析 灰色关联度 综合评判
下载PDF
云南中北部地区1954-2012年干旱评价研究 被引量:2
2
作者 韩元元 刘辉 《水资源与水工程学报》 2015年第1期111-115,共5页
利用云南中北部地区6个气象站点1954-2012年资料,选用标准化指数计算各站点干旱指数,统计分析了云南中北部地区1954-2012年发生干旱的年份及发生不同干旱的频次。研究结果表明:1临沧站出现干旱的年份较多,但蒙自站出现极端干旱的年份明... 利用云南中北部地区6个气象站点1954-2012年资料,选用标准化指数计算各站点干旱指数,统计分析了云南中北部地区1954-2012年发生干旱的年份及发生不同干旱的频次。研究结果表明:1临沧站出现干旱的年份较多,但蒙自站出现极端干旱的年份明显高于其他5站;2各站点在不同季节出现干旱的频次不同,其中腾冲在春季相比于其他5站,发生干旱的频率较高35.6%,临沧站在夏季和冬季发生干旱频率均较大,分别为35.6%和37.9%,蒙自站在秋季发生干旱频率最大,为34.8%。研究成果可为云南中北部地区的干旱评价分析和水资源保护提供一定的参考价值。 展开更多
关键词 标准化降水指数 干旱统计 干旱频次 干旱评价 云南中北部地区
下载PDF
Seasonal waterbird population changes in Lashihai Lake in northwest Yunnan, China 被引量:3
3
作者 LIAO Jun-tao YE Hui +1 位作者 HUANG Ting-fa PENG Gui-hong 《Journal of Mountain Science》 SCIE CSCD 2017年第9期1852-1862,共11页
We studied the waterbird population at Lashihai Lake, Yunnan Province, China, which is a Ramsar Site(Wetland of International Importance), to determine seasonal variation in the species composition and size of the wat... We studied the waterbird population at Lashihai Lake, Yunnan Province, China, which is a Ramsar Site(Wetland of International Importance), to determine seasonal variation in the species composition and size of the waterbird population. The study was conducted at five selected spots along Lashihai Lake at the same time each week from August 2011 to September 2013. In total, 62 waterbird species were recorded, of which 38.71%, 35.48%, 16.13%, and 9.68% were winter migrants, passage visitors, residents, and summer migrants, respectively. We found important seasonal changes in waterbird species composition and population size. Waterbird species richness was highest from September to the following April, with the total species numbers peaking in December. Total individual numbers peaked twice from late November to early December and mid-to-late February. However, waterbird species and individual numbers were comparatively lower from May to August. The change in species composition was determined by the arrival and departure dynamics of winter migrants and passage visitors. Winter migrants primarily caused the periodic changes in population size. Of concern,species and overall waterbird numbers seemed to be lower than the numbers in historical records. The decline of waterbird numbers implies that environmental changes caused by the implementation of the dam upstream of Lashihai Lake may have had adverse effects on this waterbird population. This study confirms the existence of major seasonal changes in species composition and size of the waterbird population at Lashihai Lake. Furthermore, the findings demonstrate that this wetland is of high conservation importance for waterbirds using the Central Asian–Indian and Asian–Pacific migratory routes. 展开更多
关键词 Seasonal variation Species number Individual number Waterbird population
下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部