Influence of incorporation or dual cropping of Azolla on methane emission from a flooded alluvial soil planted to rice in eastern India
Influence of incorporation or dual cropping of Azolla on methane emission from a flooded alluvial soil planted to rice in eastern India
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DOI：
10.1016/s0167-8809(99)00148-6
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发表时间：
2000-06-01
影响因子：
6.6
通讯作者：
Adhya, TK
中科院分区：
文献类型：
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作者：
Bharati, K;Mohanty, SR;Adhya, TK
绿肥广泛应用于水稻生产，可能会影响甲烷排放(CH4)。在印度Cuttack的田间试验中，研究了广泛使用的水稻生物肥料满江红(Acaroliniana MR，LD.)对水稻淹水冲积土壤CH4排放的影响，以及土壤和植物变量的选择。满江红要么在实验开始时作为绿肥种植，要么在死水中与水稻作物一起作为双季作物种植。红萍(相当于30 kg N ha(-1))与尿素(30 kg N ha(-1))的复种使CH4通量最低(89.29 kg CH3 ha(-1))。CH4累积通量大小顺序为尿素+红萍(复种)+尿素+红萍(复种+复种)+不施氮，尿素+满江红(复种)。种植满江红通过增加土壤-水界面的溶解氧浓度，对淹水土壤中CH4的排放具有一定的调节作用。在所研究的不同土壤和植物变量中，土壤氧化还原电位、土壤-洪水界面的溶解氧浓度和根基的α-萘胺氧化酶活性与CH4通量呈显著负相关。此外，包膜土壤中Fe2+和金刚三酮活性氮(NRN)含量与CH4通量呈显著正相关。结果表明，在不影响水稻产量的情况下，满江红与尿素的复种显著减少了CH4的排放，可以作为一种实用的缓解方案，最大限度地减少淹水稻田的CH4排放。(C)2000 Elsevier Science B.V.保留所有权利。
Green manures are widely used in rice production and may influence methane efflux (CH4). Influence of application of Azolla (A. caroliniana mr,ld.), a widely used biofertilizer for rice (Oryza sativa L.), on CH4 efflux from a flooded alluvial soil planted to rice, and select soil and plant variables were investigated in a field experiment at Cuttack, India. Azolla was either incorporated as green manure at the beginning of the experiment or grown as dual crop in the standing water along with the rice crop. Dual cropping of Azolla (equivalent to 30 kg N ha(-1)) in conjunction with urea (30 kg N ha(-1)) effected lowest CH4 flux (89.29 kg CH3 ha(-1)). Cumulative CH4 flux followed the order of urea > Azolla (incorporated) + urea > Azolla (incorporated + dual crop) > no N control,urea + Azolla (dual crop). Growing Azolla had a moderating effect on CH4 efflux from flooded soil through an increase in the dissolved oxygen concentration at the soil-floodwater interface. Among the different soil and plant variables studied, soil redox potential, dissolved oxygen concentration at the soil-floodwater interface and alpha-naphthylamine oxidase activity of root base exhibited significant negative relationship with CH4 flux. In addition, Fe2+ and ninhydrin reactive nitrogen (NRN) contents of the hooded soil exhibited significant positive relationship with CH4 flux. Results indicated that, dual cropping of Azolla in conjunction with urea considerably reduced CH4 efflux without affecting the rice yields and can be used as a practical mitigation option for minimizing CH4 flux from flooded paddy. (C) 2000 Elsevier Science B.V. All rights reserved.