“双季稻—鸭”共生生态系统稻作季节氮循环  

Nitrogen cycling in rice-duck mutual ecosystem during double cropping rice growth season

作　　者：张帆[1,2] 陈源泉[1] 隋鹏[1] 高旺盛[1] 

机构地区：[1]中国农业大学循环农业研究中心,北京100193 [2]湖南省土壤肥料研究所,长沙410125

出　　处：《应用生态学报》2012年第1期178-184,共7页Chinese Journal of Applied Ecology

基　　金："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239.5kg·hm-2,其中鸭产品N是12.77kg·hm-2."晚稻-鸭"共生系统N输出是338.7kg·hm-2,其中鸭产品N是23.35kg·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178.6kg·hm-2.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·hm-2, in which, 12.77 kg·hm-2 were from ducks, and the N output in the late rice-duck mutual ecosystem was 338.7 kg·hm-2, in which, 23.35 kg·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·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 

分 类 号：S511.42[农业科学—作物学] S834