EFFECTS OF NITROGEN-FERTILIZATION ON THE FLUXES OF N2O, CH4, AND CO2 FROM SOILS IN A FLORIDA SLASH PINE PLANTATION
EFFECTS OF NITROGEN-FERTILIZATION ON THE FLUXES OF N2O, CH4, AND CO2 FROM SOILS IN A FLORIDA SLASH PINE PLANTATION
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DOI：
10.1139/x94-002
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发表时间：
1994-01-01
期刊：
影响因子：
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通讯作者：
LEWIS, D
中科院分区：
文献类型：
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作者：
CASTRO, MS;PETERJOHN, WT;LEWIS, D
以湿地松（Pinus elliottii var.湿地植物（elliottii Englem.）位于佛罗里达阿拉楚阿县的种植园。施肥不影响CO2排放，但显著增加了N2 O的排放，降低了大气CH 4的吸收。施肥土壤的日平均N2 O排放量（12-74 mug N2 O-N. m-2.h-1）比对照土壤的日平均N2 O排放量（0.02-4.0 mug N2 O-N.m-2.h-1）高8-600倍。施肥土壤的日均CH_4吸收量（0.001-0.007 mg CH_4-C·m ~（-2）·h ~（-1））比对照土壤的日均CH_4吸收量（0.015-0.035 mg CH_4-C·m ~（-2）·h ~（-1））低5-20倍。我们还测量了控制和施肥土壤中负责CH 4氧化的细菌种群的相对活性。从这些测量结果表明，施肥转移的甲烷氧化细菌的相对活动占主导地位的甲烷氧化菌在控制土壤中的硝化细菌在施肥土壤的表面（0-2厘米）。这些细菌的相对活性的变化可能是负责较低的CH 4吸收的施肥土壤。
We measured fluxes of N2O, CH, and CO2 from control and urea-nitrogen fertilized soils of a mature slash pine (Pinus elliottii var. elliottii Englem.) plantation in Alachua County, Florida. The fertilization did not affect CO2 emissions, but significantly increased the emissions of N2O and lowered the uptake of atmospheric CH4. Daily average N2O emissions from the fertilized soils were 8-600 times higher (12-74 mug N2O-N.m2.h-1) than daily average N2O emissions from control soils (0.02-4.0 mug N2O-N.m-2.h-1). Daily average CH4 uptake by the fertilized soils were 5-20 times lower (0.001-0.007 mg CH4-C.m-2.h-1) than daily average CH4 uptake by control soils (0.015-0.035 mg CH4-C.m-2.h-1). We also measured the relative activities of the bacteria populations that were responsible for CH4 oxidation in the control and fertilized soils. Results from these measurements suggest that fertilization shifted the relative activities of the CH4 oxidizing bacteria from those dominated by methanotrophs in the control soils to those dominated by nitrifying bacteria in the surface (0-2 cm) of the fertilized soils. The shift in relative activities of these bacteria may have been responsible for the lower CH4 uptake by the fertilized soils.