稻鸭、稻鱼共作生态系统CH4和N2O温室效应及经济效益评估

被引：58

作者：

袁伟玲

曹凑贵

李成芳

展茗

蔡明历

汪金平

机构：

[1] 华中农业大学作物栽培与生理生态研究中心

来源：

中国农业科学 | 2009年 / 42卷 / 06期

关键词：

CH4排放; N2O排放; 稻鸭共作; 稻鱼共作; 温室效应; 经济效益;

D O I：

暂无

中图分类号：

S511 [稻]; S834 [鸭]; S964 [淡水鱼养殖方式]; S181 [农业生态学];

学科分类号：

071012 ; 0713 ;

摘要：

【目的】稻鸭、稻鱼共作生态系统是中国南方稻作区两种主要复合种养模式。研究稻鸭、稻鱼共作生态系统中CH4和N2O排放产生的温室效应并对其经济价值进行评价,旨在为进一步开发利用稻田综合利用模式提供理论基础和实践依据。【方法】采用静态箱技术,研究稻鸭、稻鱼共作生态系统CH4和N2O排放规律,并运用增温潜势对稻鸭、稻鱼共作生态系统CH4和N2O排放的温室效应及经济效益进行估算。【结果】在水稻生长期间,稻鸭、稻鱼共作系统中CH4排放峰值均出现在分蘖盛期和抽穗期,其平均排放通量均显著(P<0.05)低于常规淹水稻田;N2O的排放通量在稻田淹水期间保持较低值,而在稻田落干后迅速升高。养鸭显著(P<0.05)提高了稻田N2O的排放,养鱼降低了稻田N2O的排放。2006和2007年稻鸭、稻鱼处理CH4和N2O排放产生总温室效应分别为4728.3、4611.0kgCO2·hm-2和4545.0、4754.3kgCO2·hm-2,其温室效应成本分别为970.89、946.81 yuan/hm2和933.25和976.23 yuan/hm2,明显低于CK的5997.6和5391.5 yuan/hm2。除去CH4和N2O排放产生温室效应的环境成本,采用稻鸭、稻鱼生态种养技术的经济效益分别比常规稻田增加2210.64、4881.92yuan/hm2和3798.37、5310.64 yuan/hm2。【结论】稻鸭、稻鱼共作能有效的抑制稻田温室气体排放并显著降低其温室效应。因此,稻鸭、稻鱼共作是减少温室气体排放的有效措施之一,具有较好的推广价值。

引用

页码：2052 / 2060

页数：9

共 35 条

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