초록

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뉴질랜드 북섬의 다우지역에서 라디아타소나무 유묘생장이 일련의 주요 잡초종과의 경쟁으로 인하여 감소함을 계량화(計量化)하기 위하여 계획된 실험의 2차년도 결과이다. 라디아타소나무 유묘(1/0)들을 각각 잡초제거구와 활엽성초본, 목초, broom, pampas, buddleia, gorse와 함께 생육시켰다. 양료와 수분공급은 각 요인에 관수와 시비, 무관수와 무시비로 다양화하였다. 식재 21개월 후 라디아타소나무 유묘의 재적생장량은 잡초제거구와 gorse와 함께 생육된 구에서 최대였고 buddleia나 pampas와 함께 생육된 곳에서는 최소였다. 유묘생장에 대한 잡초의 영향이 수분이나 양료 경쟁에 의해 조정된다는 증거가 없었다. 유묘를 능가하여 치솟는 키크고 빨리 자라는 종(broom, buddleia, pampas)들이 유묘 생장에 가장 큰 영향력을 갖고 있고 그 영향력의 크기는 유묘 위에 뒤덮는 정도와 상관관계가 있었다. 이것은 피음 혹은 광경쟁이 아마도 중요한 인자임을 암시해 주고 있다.

Abstract ▼ AI-Helper

Second year results are presented from a trial designed to quantify the reduction in radiata pine(Pinus radiata D. Don) seedling growth caused by competition from a range of important weed species on a moist North Island site in New Zealand. Radiates pine seedlings(1/0) were grown on the weed free c...

Second year results are presented from a trial designed to quantify the reduction in radiata pine(Pinus radiata D. Don) seedling growth caused by competition from a range of important weed species on a moist North Island site in New Zealand. Radiates pine seedlings(1/0) were grown on the weed free control and with either herbaceous broadleaves, grass, broom, pampas, buddleia, or gorse. Resource(nutrient and water) levels were varied by factorial +/- irrigation and fertilizer treatments. Radiata pine seedling volume growth 21 months after planting was greatest when it was grown on the weed free control or in association with gorse, and was least when grown with either buddleia or pampas. There was no evidence that the effects of the weeds on seedling growth were mediated by either competition for water or nutrients. Tall, fast-growing species that overtopped the seedlings(broom, buddleia, pampas) had the greatest effect on seedling growth and the magnitude of the effect was correlated with degree of overtopping. This implies that shading or competition for light is probably an important factor.

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