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应用生态学报 ›› 1993, Vol. 4 ›› Issue (2): 146-149.

• 研究论文 • 上一篇    下一篇

易旱农田生态系统养分循环的研究

傅庆林2, 俞劲炎1, 王兆骞1   

  1. 1. 浙江农业大学, 杭州 310029;
    2. 浙江省农业科学院土壤肥料研究所, 杭州 310021
  • 收稿日期:1990-09-29 修回日期:1992-07-04 出版日期:1993-04-25 发布日期:1993-04-25

Nutrient cycling in easily drought farmland ecosystem

Fu Qinglin2, Yu Jinyan1, Wang Zhaoqian1   

  1. Zhejiang Agricultural University, Hangzhou 310029
  • Received:1990-09-29 Revised:1992-07-04 Online:1993-04-25 Published:1993-04-25

摘要: 对多熟制农田生态系统的养分循环研究表明,小麦后稻-稻(农田Ⅰ)、大麦后稻-豆(农田-Ⅱ)和油菜后稻-稻(农田-Ⅲ)复种制Ca、Mg有盈余.P、K、Fe、Mn均表现亏缺,N素有较大的浪费.N、P、K主要通过肥料输入农田生态系统,而随农产品输出系统外,Ca、Mg主要受水循环控制,作物残留部分中,N的残留量最大,为23—71kg·ha-1,Fe的残留率最高,为64—87%.

关键词: 养分平衡, 养分循环, 残留率, 农田生态系统, 重力模型, 最小费用模型, 生态网络, 生物多样性

Abstract: Studies of nutrient cycling in farmland ecosystems with multiple cropping systems show that in fields Ⅰ(double cropping rice after wheat), Ⅱ(rice-soybean after barley) and Ⅲ(double cropping rice after rape), there are surplus in Ca and Mg, deficient in P, K, Fe and Mn, and greater extravagant in N. N, Pand Kin farmland ecosystems are imported by fertilizers and exported by agricultural products. Ca and Mg are controlled by water cycle. The remnant amount of Nis maximum (23—71kg·ha-1), and the residual rate of Fe is as high as 64—87%.

Key words: Nutrient balance, Nutrient cycling, Residual rate, Farmland ecosystem, gravity model, least cost model, ecological network, biodiversity.