Phosphorus application reduces N2O emissions from tropical leguminous plantation soil when phosphorus uptake is occurring |
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Authors: | Taiki Mori Seiichi Ohta Shigehiro Ishizuka Ryota Konda Agus Wicaksono Joko Heriyanto |
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Affiliation: | 1. Laboratory of Tropical Forest Resources and Environments, Graduate School of Agriculture, Kyoto University, Kitashirakawa Oiwake-cho Sakyo-ku, Kyoto, 606-8502, Japan 2. Kyushu Research Center, Forestry and Forest Products Research Institute, Kumamoto, 860-0862, Japan 3. PT. Musi Hutan Persada, Muara Enim, 31172, South Sumatra, Indonesia
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Abstract: | We examined the effects of phosphorus (P) fertilization on N2O emissions from an Acacia mangium plantation in Indonesia. We focused on the roles of microbial and plant root activities using a trenching method to prepare root-excluded and root-including plots. In root-excluded plots, P application did not change the amount of N2O emissions. By contrast, in root-including plots, P application significantly reduced N2O emissions (from 71.1?±?20.2 to 19.3?±?5.1 mg N m?2 106 days?1). Lower total P, Bray-2 P, and Bio-P (microbial P determined by chloroform fumigation extraction method) contents in the soils of root-including plots as compared to root-excluded plots a few days after P application shows that acacia trees absorbed P fertilizer rapidly. This rapid P uptake probably relieved the P limitation of acacia and might have consistently increased root N uptake. This interpretation is supported by lower inorganic N content in P-applied soils (the average of three sampling times is 8.9 and 11.3 μg N g soil?1 in P-applied soils and soils without P application, respectively), which in turn decreased N2O emissions. Our study suggests that P fertilizer suppresses N2O emissions from tropical leguminous forest plantations. |
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