묘목 생산성과 적절한 품질을 유지하기 위하여 시비는 매우 중요하지만, 수종에 따른 최적의 시비량을 결정하기는 어렵다. 이 연구에서는 경제림 육성 수종인 물푸레나무, 들메나무, 잣나무, 전나무를 대상으로 복합비료 1x(N 6.9 g m-2, P 3.1 g m-2, K 3.7 g m-2), 2x(1x의 2배), 4x(1x의 4배) 처리가 묘목의 생장과 양분변화에 미치는 영향을 양분벡터분석(Vector diagnosis)을 이용하여 정량화하였다. 시비량이 증가함에 따라 물푸레나무와 들메나무의 수고와 근원경은 증가하는 경향을 보였고 잣나무와 전나무는 시비량에 따른 차이를 보이지 않았다. 처리 1x, 2x, 4x는 대조에 비하여 물푸레나무의 건중량을 각각 43, 11, 87% 증가시켰고, 들메나무는 각각 36, 145, 143% 더 증가시켰다. 반면 잣나무와 전나무 건중량은 시비량에 따른 유의한 차이가 없었다. 시비에 대한 양분벡터반응은 수종과 시비량에 따라 상이한 경향을 보였는데, 물푸레나무 조직의 질소 농도는 생장 및 질소함량의 증가만큼 증가하지 않는 “양분결핍” 상태였고, 들메나무는 흡수한 것보다 생장이 증가하여 농도가 감소하는 “양분희석” 상태였으며, 잣나무와 전나무는 생장이 거의 증가하지 않으면서 농도는 약간 감소하는 “과량길항” 현상을 보였다. 본 연구는 물푸레나무와 들메나무는 처리 2x 또는 그 이상의 시비가 요구되고, 잣나무와 전나무의 경우 초기 시비를 하지 않아도 생장과 양분 흡수에 문제가 없음을 보여주고 있다.

Forest resource development including plantation and thinning has severely influenced on the forest ecosystems. In this study, we compared differences of soil invertebrate communities between a larch planted forest and a natural deciduous forest. Soil invertebrates were collected at 6 sampling sites in the natural deciduous forest and at 9 sampling sites in the larch planted forest in June and September, 2013. Each study site was set in 1 ha and soil samples were collected using a soil core (5.5 cm diameter and 4.5 cm height). After sampling soil invertebrates, the invertebrates were extracted using Tullgren extractor for 72 hours. In total, 1,194 individuals and 22 taxa of soil invertebrates were identified in this study. Among them, Collembola was the most dominant taxa (41% of abundance). Abundance of the larch planted forest was higher two times than that of the natural deciduous forest. The results of this study provide fundamental information on soil invertebrate fauna before the forest managements. In the further study, we will examine the effects of various types of forest management on the community of soil invertebrates.

This study was conducted to evaluate the seasonal changes of benthic macroinvertebrate communities in a reference stream as well as the effects of physicochemical environmental factors on benthic macroinvertebrate communities in a study stream. Benthic macroinvertebrates were sampled seasonally at five different sampling sites with five replicates at Changjeon stream in Mountain Gariwang from spring to winter in 2011. Physicochemical environmental factors (e.g., discharge, width, substrate, conductivity, dissolved oxygen, pH and water temperature) were measured at each sampling sites. Water quality factors such as conductivity, dissolved oxygen and pH were similar among the sampling sites, whereas hydrological factors including discharge and width tended to be higher from upstream to downstream. In substrate composition, the relative ratio of large substrate such as cobbles was higher in summer season. In macroinvertebrate samples, 79 species with 2 phylum, 5 order and 9 family were identified during the sampling periods. Gammarus sp. was higher in upstream (sites 1 and 2), whereas Chironomidae spp. tended to be higher in downstream. In functional feeding groups, shredder was higher in upstream, whereas predator and collector-gatherer were higher in downstream. The ratios of Gammarus sp. and Plecopetera were higher in summer. Nonmetric multidimensional scaling was applied to figure out the differences of macroinvertebrate communities during the survey periods, representing the seasonal changes as well as hydrological gradients.