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“双季稻-鸭”共生生态系统稻作季节氮循环
引用本文:张帆,陈源泉,隋鹏,高旺盛.“双季稻-鸭”共生生态系统稻作季节氮循环[J].应用生态学报,2012,23(1):178-184.
作者姓名:张帆  陈源泉  隋鹏  高旺盛
作者单位:1. 中国农业大学循环农业研究中心,北京100193;湖南省土壤肥料研究所,长沙410125
2. 中国农业大学循环农业研究中心,北京,100193
基金项目:“十一五”国家科技支撑计划项目(2007BAD89B01)资助
摘    要:“稻鸭共生”是对我国传统农业稻田养鸭的继承与发展.2010年5-10月在长江流域双季稻主产区湖南布置了稻田养鸭田间试验,以常规稻作为对照,研究了早、晚稻两季“稻鸭共生”生态系统氮(N)循环特征.结果表明:“早稻-鸭”共生系统N输出是239.5 kg· hm-2,其中鸭产品N是12.77 kg·hm-2.“晚稻-鸭”共生系统N输出是338.7 kg· hm-2,其中鸭产品N是23.35 kg· hm-2.在早、晚稻两季,“稻鸭共生”系统在目前的N养分投入水平下,土壤均存在N亏缺;鸭子系统N输入主要来自系统外投入的饲料N;鸭粪N作为系统内被循环利用的养分,早、晚稻两季循环率分别为2.5%和3.5%.两季稻作后,土壤截存的N量是178.6 kg·hm-2.

关 键 词:"稻鸭共生"生态系统  鸭子系统  土壤子系统  N循环

Nitrogen cycling in rice-duck mutual ecosystem during double cropping rice growth season
Zhang Fan,Chen Yuan-Quan,Sui Peng,Gao Wang-Sheng.Nitrogen cycling in rice-duck mutual ecosystem during double cropping rice growth season[J].Chinese Journal of Applied Ecology,2012,23(1):178-184.
Authors:Zhang Fan  Chen Yuan-Quan  Sui Peng  Gao Wang-Sheng
Institution:Circular Agriculture Research Center, China Agricultural University, Beijing, China. zhangfan898@sina.com
Abstract:Raising duck in paddy rice field is an evolution of Chinese traditional agriculture. In May-October 2010, a field experiment was conducted in a double cropping rice region of Hunan Province, South-central China to study the nitrogen (N) cycling in rice-duck mutual ecosystem during early rice and late rice growth periods, taking a conventional paddy rice field as the control. Input-output analysis method was adopted. The N output in the early rice-duck mutual ecosystem was 239.5 kg x hm(-2), in which, 12.77 kg x hm(-2) were from ducks, and the N output in the late rice-duck mutual ecosystem was 338.7 kg x hm(-2), in which, 23.35 kg x hm(-2) were from ducks. At the present N input level, there existed soil N deficit during the growth seasons of both early rice and late rice. The N input from duck sub-system was mainly from the feed N, and the cycling rate of the duck feces N recycled within the system was 2.5% during early rice growth season and 3.5% during late rice growth season. After late rice harvested, the soil N sequestration was 178.6 kg x hm(-2).
Keywords:rice-duck mutual ecosystem  duck sub-system  soil sub-system  N cycling  
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