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排序方式: 共有218条查询结果,搜索用时 171 毫秒
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Shan Dan Wei Wang Jinghui Ren Yali Li Hua Hu Zhengfeng Xu Tze Kin Lau Jianhong Xie Weihua Zhao Hefeng Huang Jiansheng Xie Luming Sun Xiaohong Zhang Weipeng Wang Shixiu Liao Rong Qiang Jiangxia Cao Qiufang Zhang Yulin Zhou Haiyan Zhu Mei Zhong Yi Guo Linhua Lin Zhiying Gao Hong Yao Hongyun Zhang Lijian Zhao Fuman Jiang Fang Chen Hui Jiang Songgang Li Yingrui Li Jun Wang Jian Wang Tao Duan Yue Su Xiuqing Zhang 《黑龙江环境通报》2012,32(13):1225-1232
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A new cropping system of corn mixed with grasses was tried to make full and efficient use of water and to ease environmental problems such as soil erosion by water and wind in grain and forage feed production practices. Field experiments were conducted to investigate the water use efficiency under this mixture cropping system. Six treatments with two replicates were arranged as: bare field, corn only, rye only, alfalfa only, rye–corn mixture and alfalfa–corn mixture. Lysimeters were used to measure different components of water consumption in the crop fields for water use efficiency estimation. From the yields and water consumption of crops under different treatments, combined water use efficiency of corn and grasses were estimated. The results showed that WUEs in the mixed cropping fields of corn–grasses were much higher than those in the fields where only corn or grass were grown. Averaged WUE was 3.71 kg/m3 from the corn and rye mixture fields, 30% higher than that from the plots where only corn or rye were grown. Averaged WUE was 4.55 kg/m3 from the alfalfa and corn mixture fields, 60% higher than that from the fields where only corn or alfalfa were grown. Under the same conditions of irrigation, yields from the rye and corn mixture plots increased by 33%, as compared with those from fields where only corn or rye were grown. The yields from alfalfa and corn mixture fields were 61% higher than those from fields where only corn or alfalfa were grown. The experimental results also indicated that corn and alfalfa mixture cropping is better than a corn–rye mixture system. 相似文献
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人口、资源与环境协调发展关键问题之一——环境承载力研究 总被引:8,自引:1,他引:7
坏境承载力是人口、资源与环境协调发展研究的重要内容,是协调经济发展与环境保护的关键所在。本文试图从环境承载力的定义与表示方法入手,通过对发展变量与限制变量及其间的关系的描述,探讨承载力的内涵与研究方法;同时以福建省湄州湾新经济开发区为例进行分析,提出其规划建议,为该区人口、资源与环境协调发展提供科学依据。 相似文献
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介绍了石化行业安全仪表系统及其安全完整性等级确定方法,并对方法的应用范围进行了说明。 相似文献
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青岛市大气污染特征分析及防治对策 总被引:1,自引:0,他引:1
对青岛的空气质量监测数据进行了分析,分析结果表明:青岛市大气污染物主要是SO2、PM10与NO2,大气污染主要原因是工业废气和机动车尾气。本文还探讨了大气污染防治的新形势,提。出了大气环境质量的改善对策。 相似文献