期刊文献+
共找到2篇文章
< 1 >
每页显示 20 50 100
膜下滴灌和淹灌两种栽培模式下水稻光合生理特性的研究 被引量:11
1
作者 王志军 谢宗铭 +4 位作者 田又升 陈林 董永梅 李有忠 吕昭智 《中国水稻科学》 CAS CSCD 北大核心 2015年第2期150-158,共9页
以粳稻品系T-04和T-43为试材,通过盆栽控水试验,比较了在膜下滴灌和淹灌两种栽培模式下乳熟期叶片的光合色素含量、光合特性、叶绿素荧光参数和渗透调节物质含量的差异,分析了两种栽培模式下的水分利用效率和产量构成因素。结果表明,在... 以粳稻品系T-04和T-43为试材,通过盆栽控水试验,比较了在膜下滴灌和淹灌两种栽培模式下乳熟期叶片的光合色素含量、光合特性、叶绿素荧光参数和渗透调节物质含量的差异,分析了两种栽培模式下的水分利用效率和产量构成因素。结果表明,在膜下滴灌栽培模式下,2个水稻品系的水分利用效率显著高于淹灌,叶绿素a、叶绿素b、类胡萝卜素含量均降低;最大净光合速率、胞间CO2浓度、气孔导度、蒸腾速率显著降低,表明光合速率下降受叶绿素含量和气孔的双重影响;表观量子效率、羧化效率、ΦPSII、电子传递速率、Fv/Fm均显著降低,说明光合色素含量降低导致PSⅡ反应中心捕光能力减弱和光化学转化效率降低,从而使叶片光合速率降低;可溶性糖、可溶性蛋白均显著低于淹灌栽培;丙二醛、脯氨酸含量高于淹灌栽培,说明滴灌栽培水稻植株的膜脂过氧化加剧,细胞膜系统受到一定程度的破坏,通过主动积累渗透调节物质,适应干旱胁迫。膜下滴灌栽培水稻单位面积有效穗数和结实率显著降低,导致最终减产。 展开更多
关键词 膜下滴灌 传统淹灌 光合特性 渗透调节 水稻
在线阅读 下载PDF
Future China-Africa research collaboration in geoscience:Challenges and opportunities
2
作者 Michael H.STEPHENSON Hassina MOURI +5 位作者 Gbenga OKUNLOLA CHENG Li WANG Meng ZHAO Yu GU Liping WANG Chengshan 《地学前缘》 北大核心 2025年第1期459-465,共7页
At the 19th G20 Summit in Brazil in November 2024,China promoted the development of sustainable solutions to climate change,biodiversity loss,and environmental pollution.This continued the theme of the 2016 G20 Hangzh... At the 19th G20 Summit in Brazil in November 2024,China promoted the development of sustainable solutions to climate change,biodiversity loss,and environmental pollution.This continued the theme of the 2016 G20 Hangzhou Summit,at which China placed development at the center of the G20’s macroeconomic policy coordination for the first time,adopting the G20 Action Plan on the United Nations 2030 Agenda for Sustainable Development and the G20 Initiative on Supporting Industrialization in Africa and Least Developed Countries.In Brazil,China announced actions on advancing modernization in Africa over the next three years with a Chinese commitment of RMB360 billion yuan in financial support.In this article,we examine the potential role of geoscience research and practice in development,particularly in the sustainable use of natural resources,the prevention of climate change impacts,as well as mitigation of geo-hazards and their health implications,indicating the areas where China’s geoscience for Africa is strong and where it requires more effort.We find that although China is the world’s leading publisher of scientific papers,its contribution to geoscience in Africa(the globe’s fastest-growing economic area),as shown by bibliometric research,appears to be rather small and inconsistent with the research priorities of Africa.Amongst the priorities for geoscience research in Africa,which are not addressed substantially by the research conducted so far,are sustainable mineral and hydrocarbon development,hydrology and hydrogeology,climate change and resilience,natural hazards,medical geology,agrominerals,and geoscience education and training.A particular opportunity for African nations is the presence of critical minerals-minerals needed for the energy transition and for batteries for electric cars in particular.Africa is well-endowed with many of these critical materials,such as rare earth elements and platinum group metals.Several research groups stress the need for the agency on the part of African institutions to map out these valuable resources,understand their value and the economics and sustainability of their extraction,encourage local business,attract investment,and scrutinize proposals from potential international investors to get the best deals.A strong point of existing China-led geoscience development includes the Deep-time Digital Earth(DDE)program online computing platform and its artificial intelligence tool GeoGPT,which is being developed in partnership with Zhejiang Laboratory.These are being developed with strong China funding support for free and wide global access,with a particular focus on Africa.These advanced tools will help to place the agency of development squarely in the hands of African scientists and institutions.In summary,the following are recommended:(1)a more coordinated and strategic approach to China-led geoscience research in Africa;(2)an Africa-centered,geoscience funding initiative that concentrates on relevant topics to the continent such as critical minerals exploration and other geological resources,materials and processes and their health implications on the populations and ecosystems in general,as well as climate change and climate change resilience;and(3)continued support for China-led international initiatives that seek to increase the agency and capacity of Africa geoscience researchers,for example the Deep-time Digital Earth platform. 展开更多
关键词 open science sustainable development digital empowerment China-Africa geo-collaboration Deep-Time Digital Earth
在线阅读 下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部