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Showing items 1 through 9 of 16.This 2012 Global Food Policy Report is the second in an annual series that provides an in-depth look at major food policy developments and events.
通过综合80年代初以来的农作物面积与产量统计、耕地分布、农业灌溉分布以及作物生长适宜性分布等多源数据,利用基于交叉信息熵原理的作物空间分配模型(Spatial Production Allocation Model,SPAM),获得了我国10km像元尺度的水稻分布信息。在此基础上,重点分析了80年代初以来水稻种植面积与产量的时空变化特征。总体来看,在全国水稻种植区域内发生变化的地区中有超过50%的地区水稻种植面积出现缩减态势,但仍有近70%的地区水稻产量在增加。
As a result of the Land Reform, property forming and land market, farm areas were often built up from a number of land plots (up to 20), sometimes with unfavourable order.
Reviews the history of Chinese hydropower development on the Lancang from the 1950s to the present, the downstream political, economic and environmental implications of Lancang hydropower, China’s hydropower influence in the Lower Mekong Basin, and China’s external environmental and social polici
Reviews current literature on definitions of CSR, main international frameworks, criticisms, CSR in Asia, CSR in hydropower, and drivers and trends in CSR.
In the recent years the issue of optimal size of the utilised agricultural area and its accessibility in particular regions has gained increased importance.
Research on the sustainable use of the soil as the main agricultural resource employing different field crop rotations and tillage systems was started in 2009.
联合国挑战徽章训练手册的目的旨在提高认识和教育、最重 要的是鼓励年轻人改变他们的行为并成为改变当地社区的积 极推动者。挑战徽章训练手册适合在学校班级和青少年团体 中使用并获得世界女童子军协会和世界童子军运动组织的认 可。手册包括广泛的活动且提供很容易由教师或领队进行调 整的想法。其他可用的或正在开发的一系列有关其他主题的 挑战徽章训练手册,包括:农业、生物多样性、气候变化、 能源、森林、管理、饥饿、营养、土壤和水。 海洋挑战徽章训练手册旨在帮助教育孩子和青少年海洋在支 持地球生命中扮演的重要角色。