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상수리나무 뿌리 분해 및 분해과정에 따른 영양염류 변화

Decay Rate and Nutrients Dynamics during Decomposition of Oak Roots

문형태
한국생태학회 (The Ecological Society Of Korea)|2004.06|Journal of Ecology and Environment|제27권 제3호|pp. 165-171

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키워드

NutrientsDecay rate영양염류상수리나무Quercus acutissima분해율분해상수뿌리분해Decomposition constantRoot decomposition
주제분류생물학

초록

상수리나무 뿌리의 분해율과 분해과정에 따른 영양염류의 변화를 조사하였다. 33개월 경과 후 뿌리의 분해율은 직경 0.2cm 미만(R1), 0.5~1cm(R2), 1~2cm(R3), 2~4cm(R4)가 각각 49.6%, 47.5%, 66.4%, 66.1%, 분해상 수 k는 각각 0.249/yr, 0.234/yr, 0.397/yr, 0.393/yr로 직경이 큰 것의 분해율이 높았다. 상수리나무 뿌리는 유사한 직경의 상수리나무 가지에 비해 분해가 빠른 것으로 나타났다. 분해 과정에 따른 뿌리의 질소 함량은 모든 직경급에서 증가하는 경향을 보였다. 33개월 경과 후 뿌리의 질소 잔존률은 R1, R2, R3 그리고 R4가 각각 66.5%, 86.7%, 84.4%, 44.4%이었다. 분해중인 뿌리의 인 함량은 분해 초기에 감소하다 후반부에는 증가하는 경향을 보였으며, 33개월 후 인의 잔존률은 R1, R2, R3 그리고 R4가 각각 64.7%, 62.4%, 93.1%, 30.7%이었다. 분해중인 뿌리의 칼륨 함량은 분해가 진행됨에 따라 초기 값보다 현저하게 감소하였으며, 33개월 경과 후 칼륨의 잔존률은 R1, R2, R3 그리고 R4에서 각각 11.6%, 10.6%, 5.9%, 7.7%이었다. 분해과정 중 칼슘 함량의 변화는 직경급에 따라 달랐으며, 33개월 경과 후 칼슘의 잔존률은 R1, R2, R3 그리고 R4에서 각각 66.2%, 51.0%,39.1%, 48.3%이었다. 뿌리의 마그네슘 함량은 직경이 작을수록 초기 함량이 높았으며, 분해가 진행됨에 따라 R4에서는 초기값에 비해 함량이 증가하였으나 R1, R2, R3에서는 초기값보다 감소하였다. 33개월 경과 후 마그네슘 잔존률은 R1, R2, R3 그리고 R4에서 각각 15.3%, 29.9%, 24.6%, 69.4%로 칼슘과는 달리 직경이 큰 뿌리에서 잔존률이 높았다.

Abstract

Weight loss and nutrients dynamics during decomposition of oak roots (diameter classes:R1<0.2cm, 0.5cm<R2<1cm, 1cm<R3<2cm, 2cm<R4<4cm) (Quercus acutissima) were studied for 33-months in Kongju, Korea. After 33-months, decomposition rate of R1, R2, R3 and R4 was 49.6%, 47.5%, 66.4% and 66.1%, respectively. The decomposition constant(k) for R1, R2, R3, and R4 was 0.249/yr, 0.234/yr, 0.397/yr and 0.393/yr, respectively. Larger diameter class of the root lost more weight than smaller diameter class. N concentration in decomposing oak roots increased in all diameter classes. After 33-months, remaining N in R1, R2, R3 and R4 was 66.5%, 86.7%, 84.4% and 44.4%, respectively. P concentration in decomposing oak roots decreased in early part of decomposition and then increased in later stage of decomposition. After 33-months, remaining P in R1, R2, R3 and R4 was 64.7%, 62.4%, 93.1% and 30.7%, respectively. K concentration in decomposing oak roots decreased rapidly in early stage of decomposition. Remaining K in R1, R2, R3 and R4 was 11.6%, 10.6%, 5.9% and 7.7%, respectively. Ca concentration in decomposing oak roots showed different among diameter classes. After 33-months, remaining Ca in R1, R2, R3 and R4 was 66.2%, 51.0%, 39.1% and 48.3%, respectively. Initial concentration of Mg in oak root was higher in smaller diameter class. After 33-months, remaining Mg in R1, R2, R3 and R4 was 15.3%, 29.9%, 24.6% and 69.4%, respectively.

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