您的位置: 首页 > 院士专题 > 专题列表

共检索到198条,权限内显示50条;

[学术文献] Adding another dimension: Temporal development of the spatial distribution of soil and crop properties in slow-forming terrace systems 进入全文

Agriculture, Ecosystems & Environment

The cultivation of marginal land in the Andes makes it one of the hot-spots of soil erosion. Since the 1980s an alternative soil conservation method denominated “slow-forming terraces” has been introduced to the area, since it is not labour or cost intensive and therefore more likely to be applied by the small-holder farmers. Research investigating the short-term effect on soil properties and crop productivity in these terrace systems showed reason for concern regarding the sustainability of the method, since there were position-dependent drops in crop productivity and related soil properties especially on shallow soils. Here, we investigate in the same terrace systems the temporal change of the observed properties 21 years after establishment. The terraces are managed by subsistence farmers and thus provide a valuable insight: if the spatial heterogeneity disappears, this renders slow-forming terraces agronomically sustainable in the long-term. Our results show a significant improvement of soil properties in general and furthermore to most extent a disappearance of the spatial heterogeneity in plant properties. These findings outline that the initial disadvantages of this soil conservation practice can be overcome in the long-term making slow-forming terraces a valuable measure for soil conservation and a sustainable system for small-holder subsistence farming. A support in farm planning, informing about both short- and long-term agronomic effects, while also considering social, economic and cultural/traditional aspects, could increase the adoption and maintenance of conservation measures and also symbiotically increase family income.

[前沿资讯] Counting the hidden $12-trillion cost of a broken food system 进入全文

Nature

There’s an unfolding tragedy at the heart of the world’s food system and its cause lies mainly at the door of governments, food manufacturers and agribusinesses. The situation is urgent. One-third of all food goes to waste, and yet governments and other players in the food system are unable to prevent 820 million people from regularly going hungry. The food industry, especially, bears responsibility for the fact that 680 million people are obese, but it is largely governments and their citizens who have to pick up the costs of treatment.

[前沿资讯] 四川发布2018年度水资源公报农业用水量实现“五连降” 进入全文

四川日报

10月15日,省水利厅公布2018年度全省水资源公报。去年,全省农业用水量为156.6亿立方米,同比下降3.4亿立方米。在此基础上,实现农业用水“五连降”。省水利厅相关负责人解释,我省农业用水量不断下降的背后,是持续开展高效节水灌溉、农业水价综合改革等。特别是农业水价综合改革,基本实现了农业用水从“按亩收费”到“计量收费”的转变。从总量上看,去年我省用水总量约259亿立方米。除开农业用水,其余依次是生活、工业和生态用水。水资源方面,受去年汛期降雨量偏多两成影响,2018年全省水资源总量同比增加12.9个百分点,达到2594亿立方米,不过在地域分布上仍然不均衡。水质方面,得益于河长制、湖长制的实施、重点流域水环境综合治理和农村人居环境整治,去年全省河流水质明显改善。全川河流中一至三类地表水质长度占比达到97.8%,同比增加7.5个百分点。

[科技报告] 2018年四川省水资源公报 进入全文

四川省水利厅

2018年,全省农业用水量为156.6亿立方米,同比下降3.4亿立方米。 从总量上看,去年四川用水总量约259亿立方米。除开农业农业维持用水头号大户外,其余依次是生活、工业和生态用水。其中,生态用水总量超5.5亿立方米,也是近年来全省用水需求增长最快的领域。 从用水区域上来看,去年成都市用水总量达到56.02亿立方米,占全省总量的两成以上。 水资源方面,受去年四川汛期降雨量偏多两成影响,2018年全省水资源总量同比增加12.9个百分点,达到2594亿立方米。不过,在地域分布上仍然不均衡。其中,甘孜、阿坝和、凉山、攀枝花人均占有量超过两万立方米,省内其余地区平均值只有1752立方米。最少的是内江,只有391立方米。 水质方面,得益于河长制、湖长制的实施、重点流域水环境综合治理和农村人居环境整治,去年四川河流水质明显改善。特别是,全川河流中一至三类地表水质长度占比达到97.8%,比上一年度增加7.5个百分点。

[专业会议] 2019中国物联网大会(CIOTC)将于2019年11月11-13日南京召开 进入全文

中国电子学会;中国通信学会

为响应国家“十三五”规划、“互联网+”行动计划、《国家信息化发展战略纲要》等国家战略部署,在我国物联网十年发展里程碑的重要阶段,中国电子学会与中国通信学会,将于2019年11月11日-13日在江苏南京召开2019中国物联网大会。本次物联网大会紧抓行业发展契机,汇集国家部委、地方政府、两院院士、科研院所、高校、企业、社会团体等多方声音,以主论坛、分论坛、封闭会议、展览展示等多种形式展开。旨在共同推动中国物联网学术交流,技术应用、商业模式创新,探讨物联网产业发展瓶颈,总结物联网发展十年经验,研判未来发展趋势,搭建政产学研用资互动交流共享平台,打造全行业合作洽谈盛会。 热点主题:大数据与物联网融合创新、智能硬件与可穿戴、边缘计算、区块链、物联网安全、智慧生态、智慧城市、智慧农业、智能家居、物联网5G技术、工业互联网、物联网标识与标准、智能交通、人工智能与物联网、智能物流、物联网芯片与传感器、VR/AR、人才培养、物联网职业教育。

[科技报告] 2019年世界水资源发展报告 进入全文

UN waters

《2019年世界水资源发展报告》(United Nations World Water Development Report- LEAVING NO ONE BEHIND),提出改进水资源管理、获得充足的供水和卫生服务对解决各种社会、经济不平等现象至关重要。报告从社会方面、经济方面及地区视角等,审视水资源现状及水服务的获取,旨在实现享受水提供的多种利益和机会时“没有人掉队”。

首页上一页123456...下一页尾页

热门相关

意 见 箱

匿名:登录

个人用户登录

找回密码

第三方账号登录

忘记密码

个人用户注册

必须为有效邮箱
6~16位数字与字母组合
6~16位数字与字母组合
请输入正确的手机号码

信息补充