Effects of Soil Environment on Symbiotic Activities of Arbuscular Mycorrhizal Fungi(AMF) in the Coastal Reclaimed Lands

Arbuscular Mycorrhizal Fungi(AMF)의 공생활성에 미치는 해안 간척지 토양환경의 영향

  • Koh, Sung-Duk (Department of Science Education, Teacher's College, Chungbuk National University)
  • 고성덕 (충북대학교 과학교육학과)
  • Published : 1998.12.30

Abstract

The symbiotic activities of arbuscular mycorrhizal fungi (AMF) by analyzing spore density, symbiosis intensity and vertical distribution of AMF spores, phytomasses of higher plants such as Calamagrostis epigeios, Imperata cylindrica, Artemisia scoparia, Aster tripolium and Sonchus brachyotus, and physico-chemical properties of soil were determined in the rhizospheres of higher plants in abandoned two coastal reclaimed lands, which were constructed in 12 and 30 years ago, respectively. Vertical distribution of the AMF spores in the rhizospheres of higher plants was restricted within 20 cm depth from soil surface, which would be closely related with vertical distribution of root system, water table and soil aeration. Of vertical distribution of soil properties, W.C., A-P and K concentrations were increased as soil depth was lowered. In the coastal reclaimed lands, symbiotic activities of the AMF such as spore density and symbiotic intensity, were conspicuously stimulated by the increase of soil pH value, organic matter and total nitrogen concentrations, but inhibited by the increase of moisture, available phosphorus and sodium concentrations in the rhizosphere soil. Phosphorus absorption by higher plants growing in the reclaimed lands increased by the rise of symbiotic activities of AMF. Since symbiotic activities of AMF were stimulated with decreasing soil phosphorus concentrations, higher plants associated with AMF absorbed a large amount of phosphorus from the soil is low phosphorus concentrations.

간척연도가 다른 두 간척지의 고등식물의 근권에 존재하는 arbuscular mycorrhizal fungi(AMF)의 포자밀도, 공생강도와 토양의 물리 화학적 특성 및 AMF포자의 수직분포 등을 조사하여 토양특성에 따른 AMF의 공생생활성의 반응, 식물의 인 흡수에 미치는 AMF의 영향 등을 규명하였다. 간척지에서 AMF 포자의 수직분포는 포자가 표토로부터 20cm 깊이 이내에 분포하는데 그 원인은 뿌리의 수직분포, 지하수위 및 토양의 통기(aeration)와 관계가 있을 것이다. 토양 특성의 수직분포 중에서 토심이 깊어짐에 따라 증가되는 토양요인을 W.C., A-P 및 K이었고, 감소하는 요인은 O.M, Ca 및 Zn이었다. AMF의 공생생활성인 포자밀도와 공생강도는 토양의 pH, O.M., T-N 함량이 증가함에 따라 증가되고 W.C., A-P, Na 함량이 증가함에 따라 감소되는 두 반응 패턴이 나타났다. 간척지 식물의 인 흡수는 AMF의 공생활성이 커짐에 따라 증가되고, AMF의 공생활성은 토양의 인 함량이 적음에 따라 커짐으로써 식물은 AMF의 공생활성에 의하여 인 함량이 적은 토양에서 많은 양의 인을 흡수하였다.

Keywords

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