学术论文

      Environmental Problems From Tea Cultivation in Japan and a Control Measure Using Calcium Cyanamide

      Abstract:
      A field experiment, involving lime N (calcium cyanamide, CaCN2) fertilization as a control measure, was conducted to study environmental problems induced by long-term heavy N application in Japanese tea fields. Long-term tea cultivation caused serious soil acidification. Seventy-seven percent of the 70 tea fields investigated had soil pH values below 4.0, and9% below 3.0, with the lowest value of 2.7. Moreover, excess N application in tea fields put a threat to plant growth,induced serious nitrate contamination to local water, and caused high nitrous oxide loss. Compared with the conventional high N application treatment (1 100 kg N ha-1) without lime N, the low N application (400 kg N ha-1) with calcium cyanamide effectively stopped soil acidification as well as achieved the same or slightly higher levels in tea yield and in total N and amino acid contents of tea shoots. The application of calcium cyanamide could be a suitable fertilization for the prevention of environmental problems in tea cultivation.
      Author: K.OH [1] T.KATO [2] LI Zhong-Pei [3] LI Fa-Yun [4]
      作者单位: Center for Environmental Science in Saitama, Saitama 3,47-0115 (Japan) Jinenjou-no-kai, NPO, Shizuoka 421-0302 (Japan) State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences,njing 210008 (China) Faculty of Environmental Sciences, Liaoning University, Shenyang 110016 (China)
      刊 名: 土壤圈(意译名) ISTICSCI
      Journal: PEDOSPHERE
      年,卷(期): 2006, 16(6)
      分类号: S1
      机标分类号: X7 X45
      在线出版日期: 2006年12月25日
      基金项目: 国家自然科学基金,中国科学院知识创新工程项目