상수리나무림 임상에 공급한 무기질소가 토양호흡에 미치는 영향
Effect of Nitrogen Addition on Soil Respiration
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공주 근교의 상수리나무림에서 무기질소가 토양호흡에 미치는 영향을 조사하였다. 임상의 지형이 비교적 평탄한 지소를 선정하여 1m × 1m 넓이의 49개 격자 중 대조구와 실험구 1, 실험구 2를 임의로 5반복으로 선정하였다. 실험구 1과 실험구 2에는 질산암모늄(NH4NO3)을 각각 30 g/m2, 60 g/m2로 시비하였다. 대조구 와 실험구에서 토양호흡, 토양온도, NH4 +-N 및 NO3--N를 6월부터 10월까지 2주 간격으로 측정하였다. NH4+-N는 6월 초 대조구의 상층과 하층토양이 각각 21.1㎍/g으로 동일하였는데, 실험구 1은 상층토와 하층토에서 각각 34.0㎍/g, 28.5㎍/g, 실험구 2는 각각 36.7㎍/g, 28.7㎍/g으로 대조구에 비해 현저히 높았다. NO3 --N의 양은NH4 +-N에 비해 매우 낮았지만 변화 양상은 유사하였다. 7월에 큰비가 내린 후인 8월에는 실험구의 무기질소가 현저히 감소하였다. 대조구에 비해 실험구의 호흡량이 높았다. 7월 초 대조구의 호흡량이 8.0±0.4μmol- 1․m-2․s-1인데 비해 실험구 1과 실험구 2에서는 각각 9.3±0.6, 10.2±0.5μmol-1․m-2․s-1으로 7월 말까지는 대조구와 실험구 간에 차이가 있었고, 이러한 차이는 5% 수준에서 유의성이 인정되었다. 그러나 8월 중순에 측정한 호흡량은 대조구, 실험구 1, 실험구 2에서 각각 13.0±0.4, 13.5±0.5, 13.3±0.6μmol-1․m-2․s-1으 로 유사하였다. 본 실험의 결과 상수리나무림의 임상에 공급된 무기질소는 토양호흡량을 증가시키는 효과가 있었다.
Abstract
In order to gain a better understanding of how forests participate in the cycling of carbon, effects of nitrogen addition on soil respiration were investigated on the oak forest in Kongju, Korea. Study site was divided into control, treatment 1 and treatment 2 plots, with 5 replication in each plot. In each replicate of treatment 1 and treatment 2 were fertilized with ammonium nitrate (NH4NO3), 30 g/m2 and 60 g/m2, respectively. Soil respiration, soil temperature, ammonium-N and nitrate-N were measured during the experimental period. Ammonium-N and nitrate-N in T2 were higher than those in control and T1. Ammonium-N and nitrate-N in top-soil and sub-soil decreased sharply in August after big rainfall in July in T1 and T2, however, those in control plot increased. Soil respiration in T2 plot showed consistently higher than those in control and T1 until the end of July. However, soil respiration was similar among the control, T1 and T2 in mid-August and September. The amount of CO2 released from soil respiration in control, T1 and T2 in July was 8.0±0.4, 9.3±0.6 and 10.2±0.5 μmol-1․m-2․s-1, respectively. However, those in control, T1 and T2 in mid-August was 13.0±0.4, 13.5±0.5,13.3±0.6 μmol-1․m-2․s-1, respectively. The results suggest that nitrogen addition in this oak forest has a positive effect on soil respiration.
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