Efficiency and Economy of a New Agricultural Rainwater Harvesting System

作     者：Ji Wenhua Cai Jianming Marinus van Veenhuizen 

作者机构：Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China Graduate University of Chinese Academy of SciencesBeijing 100049China ETC-Urban AgricultureLeusden 3830 ABNetherland 

出 版 物：《Chinese Journal of Population,Resources and Environment》 (中国人口·资源与环境（英文版）)

年 卷 期：2010年第8卷第4期

页      面：41-48页

学科分类：0303[法学-社会学] 1007[医学-药学(可授医学、理学学位)] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 083001[工学-环境科学] 1004[医学-公共卫生与预防医学(可授医学、理学学位)] 1001[医学-基础医学(可授医学、理学学位)] 08[工学] 0706[理学-大气科学] 

基　　金：supported by SWITCH Project(project no.018530),which was launched by UNESCO-IHE(Institute for Water Education)in2006 Municipal Extension Center of Agricultural Technologies 

主　　题：Beijing greenhouse agriculture rainwater harvesting cost-benefit 

摘      要：Shortage of water is the key limiting factor for agricultural development of *** harvesting(RWH) could provide an alternative water source for greenhouse agriculture,but local natural and socioeconomic conditions challenge the application of the *** article analyses the advantages and disadvantages of different types of greenhouse RWH in Beijing,and describes a new greenhouse RWH system demonstrated in 2008 in Huairou,a suburb district of *** analyses the efficiency,cost-benefit ratios and limiting factors of the new *** results show that with the new system,RWH efficiency can be as high as 66%(of total rainfall) and the rainwater usage rate can reach 69% of total water *** ratio of benefit to cost of government investment can be 1.84,and the ratio of benefit to cost of a farmer s investment could be 1.68 provided the project is designed to save water and also increase ***,the price of groundwater for agriculture directly influences the potential for applying and scaling up the *** the RWH system does not increase the farmers incomes at the current water price,they will not use it until the water price rises to a critical point,which is determined by external *** article also suggests a number of measures to increase the efficiency of the system in order to apply it on a large scale.