生态补偿中的环境成本核算研究综述

环境成本是衡量经济发展代价——环境污染与生态破坏的主要方式,也是制定生态补偿标准的重要依据之一,但现有研究中很少明确提出以环境成本为依据核算生态补偿标准。主要从环境成本入手,在全面总结国内外近期有关生态补偿标准制定以及环境成本的基础之上,对环境成本的概念和核算方法进行了概述,分析了目前环境成本核算研究中存在的一些问题,对环境成本与保护成本关系、环境成本空间化进行了讨论,认为环境成本学科综合化、核算方法科学化是未来的发展趋势,环境成本的空间化是未来的研究重点。     

残膜对土壤水分运移的影响

采用室内模拟的方法对残膜影响土壤水分运移进行了研究。结果表明,残膜会阻碍土壤水分向上移动,而且残留量和残膜面积越大,阻碍作用越明显。此外,残膜对土壤水分下渗有一定的促进作用。     

On the problem of pre-harvest sprouting of wheat

Summary The problem of pre-harvest sprouting in wheat is very intricate. New concepts in breeding for resistance to pre-harvest sprouting regard many components such as -amylase production potential, response to gibberellic acid and inhibition in the bracts as important as dormancy. In the research work carried out at The University of Sydney's Plant Breeding Institute, we found varietal differences for each of these components. We also developed criteria for screening breeding material for these components. The implications of our findings in planning efficient breeding programmes to evolve varieties with multiple resistance to pre-harvest sprouting have been discussed briefly.