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NTIS 바로가기생태와 환경 = Korean journal of ecology and environment, v.46 no.2, 2013년, pp.276 - 288
채희명 (중앙대학교 자연과학대학 생명과학과) , 이상훈 (중앙대학교 자연과학대학 생명과학과) , 차상섭 (중앙대학교 자연과학대학 생명과학과) , 심재국 (중앙대학교 자연과학대학 생명과학과)
The present study investigates the effects of elevated soil nitrogen on growth and decomposition of Oryza sativa shoots. The plants were cultivated in greenhouse until leaf senescence and the total biomass of the plant increased 1.9 times at nitrogen addition plot. Total C and N content in shoot inc...
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핵심어 | 질문 | 논문에서 추출한 답변 |
---|---|---|
생태계로의 질소 유입은 어떠한 변화를 일으킵니까? | 질소는 육상생태계에서 식물의 성장을 제한하는 주된 양분으로서 (Vitousek and Howarth, 1991) 산림 수목의 성장을 증가시킨다고 하였다(Spiecker, 1999). 또한, 생태계로의 질소 유입은 식물체의 질소 함량을 증가시키고 C/N 비율과 lignin 함량을 감소시켜 낙엽의 화학적 조성에 변화를 일으킨다(Norby, 1998; Hobbie, 2000). 이러한 식물체의 화학적 조성의 변화는 그 분해율에 영향을 미치는 가장 중요한 요인으로 인식되어져 왔다(Melillo et al. | |
토양 질소의 증가는 어떠한 영향을 미칩니까? | 또한, 이러한 토양 질소의 증가는 분해뿐만 아니라 분해 과정에 관련된 분해 미생물의 변화를 일으키며(Treseder, 2008) 미생물의 성장, 호흡, 분해 효소의 활성 등에 영향을 미친다. Magill and Aber (1998), 그리고 Fog (1999)는 질소 시비가 미생물의 성장과 호흡을 감소시키거나 영향을 미친다고 하였으며 Sinsabaugh et al. | |
Treseder (2008)는 질소 시비에 의해 평균 15% 정도의 미생물량이 감소함을 확인하였는데 이러한 현상의 원인은 무엇입니까? | Treseder (2008)는 메타분석을 통하여 질소 시비에 의해 평균 15% 정도의 미생물량이 감소함을 확인하였다. 이러한 미생물량의 감소는 질소의 시비로 인하여 lignin 과의 복합체를 형성함으로써 난분해성 및 독성 물질이 생산되어 미생물 성장 및 활성이 저해되며(Garcia and Rice, 1994; Lovell et al., 1995), lignin과 cellulose 분해효소의 생산이 질소 시비에 의해 직접적으로 억제되기 때문이라고 하였다(Carreiro et al., 2000). |
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