Effect of the long-term application of anaerobically digested residual slurry on methane emissions in a rice paddy field
Effect of the long-term application of anaerobically digested residual slurry on methane emissions in a rice paddy field
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DOI：
10.1080/00380768.2017.1322918
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发表时间：
2017-05
影响因子：
2
通讯作者：
Takashi S. T. Tanaka;Yoshiro Nitta;K. Kido;T. Nishikawa;T. Matoh;T. Inamura
中科院分区：
文献类型：
--
作者：
Takashi S. T. Tanaka;Yoshiro Nitta;K. Kido;T. Nishikawa;T. Matoh;T. Inamura
摘要畜禽粪便厌氧消化是一种环境友好的可再生能源生产技术。厌氧消化的残余泥浆已在世界范围内用作高地和稻田的液体肥料。然而，一个有争议的问题仍然是，是否泥浆的应用到稻田增加甲烷排放量;虽然甲烷是最普遍的温室气体之一，很少有人知道的影响，长期的残留泥浆的应用对甲烷排放。在这项研究中，我们以不同的施用量（10、15和20 g N m−2，基于铵态氮含量）在稻田中重复施用泥浆6年。在应用的第五年和第六年，我们评估了甲烷通量和土壤总碳含量的影响。长期施用泥浆（10 g N m−2）对谷物产量的影响与化肥（10 g N m−2）相当。2006年和2007年水稻生长季施用秸秆还田有可能增加甲烷的累积排放量。另一方面，我们观察到土壤总碳在土壤中没有显著积累。因此，我们不能排除将剩余泥浆应用于稻田导致额外甲烷排放的潜在风险。
ABSTRACT The anaerobic digestion of livestock manure is an environmentally compatible technology used for the production of renewable energy. Anaerobically digested residual slurry has been used worldwide as a liquid fertilizer in both upland and paddy fields. However, a controversial question remains as to whether the application of slurry to rice paddy fields increases methane emissions; although methane is one of the most prevalent greenhouse gases, little is known about the effects of the long-term application of residual slurry on methane emission. In this study, we repeatedly applied slurry to a paddy field for six years at different application rates (10, 15, and 20 g N m−2 based on ammonium-nitrogen content). At the fifth and sixth years of application, we evaluated the effect in terms of methane flux and soil total carbon content. The effect of the long-term application of the slurry (10 g N m−2) on grain yield was equivalent to that of chemical fertilizer (10 g N m−2). The application of the residual slurry was likely to increase the cumulative methane emissions during rice growing season in both 2006 and 2007. On the other hand, we observed that soil total carbon did not accumulate significantly in the soil. Thus, we cannot rule out the potential risk of additional methane emissions caused by the application of the residuary slurry to paddy fields.