• 한국동물학회:학술대회논문집
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• 한국동물학회 1996년도 한국생물과학협회 국제학술대회
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• pp.113.1-113
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• 1996

No Abstract, See Full Text

• Journal of Plant Biology
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• 제7권2호
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• pp.1-8
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• 1964

Cha, Jong Whan (Dept. of Biology, Graduate School, Dong Kuk Univ.) The changes of chemical properties of forest soils in dry and wet seasons. Kor. Jour. Bot. VII(2): 1-8, 1964. Soil selected for the present investigation was collected from a mountain of the Forestry Experiment Station of the vicinity of Seoul. The forest communities studied were three forest and a unplanted soils. The soil samples were obtained from each forest type during dry and wet seasons. And these samples were collected from four horizons of all communities respectively. It was showed that exchangeable hydrogen was increased by rainfall, and total exchangeable base decreased in the same way. The content of nitrogen is washed away by rainfall, especially ammonium nitrogen was highly significant between dry and wet season. On the contrary, organic matter and available phosphorus were of no significant difference between dry and wet seasons. The values of pH appeared a different response in dry and wet seasons according to the plant communities. The needle-leaved forest soils showed more acidity than the broad-leaved forest soils, and the least acidity in open places. All nutrients in soil studied gradually decreased down the profiles. According to statistical analyses of the soil components among all soil horizons, total exchangeable bases in wet season indicated only significant at 1%. Exchangeable hydrogen and organic matter of the soil in dry season was particularly very low with increased depth in the profile. The fertility level of most forested soils selected for the present investigation is low according to chemical tests for available nutrient elements.

• The Korean Journal of Ecology
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• 제21권5_3호
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• pp.703-712
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• 1998

Physicochemical factors, microbial population size and the properties of the bacterial isolates were estimated to find out the nature of soil ecosystem of Mt. Nam. Samples were obtained from the surface layer of soils on which specific plant community is developed. Average content of moisture and organic matter of the soils were 21.6% and 17.3%, respectively. These values were similar to those of developing forest soils, but were slightly lower than those of climax ecosystem such as Piagol in Mt. Chiri. Chiri. Content of phosphate was higher than those of other forest soils. The population size of soil bacteria ranged from 27.4 to 195.8 ${\times}\;10^5$ CFU/g. duy soil, and the size is somewhat dependent on the moisture and oranic matter content of soils. A large number of bacteria were able to decompose macromolecules such as starch, elastin and gelatin. Bacterial species composition of each soil was comparatively simple. Pseudomonas, Agrobacterium, Flavobacterium and Xanthomonas which are Gram-negative short rods were widely distributed in the forest soils. The endospore forming Bacillus species were also the main constituents of the soil microflroa. Actinomycetes were widely distributed in the forest soils, but the distribution pattern varied in each site. Most of the actinomycetes were also able to decompose organic macromolecules. The rate of resistant actinomycete strains to antibiotics and heavy metals were lower than those from cultivated soils, but higher than those from well-preserved forest soils. Antibiosis pattern of the actinomycete isolates was similiar to the resistance pattern. This means the forest soils of Mt. nam was somewhat interferred by artificial behabiour.

• Journal of Forest and Environmental Science
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• 제36권2호
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• pp.133-142
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• 2020

Soil physical and chemical properties at three layers such as top (0-10 cm), middle (10-20 cm) and bottom (20-30 cm) layers under three different vegetation types were studied. Soil samples were collected from Acacia forest, vegetable and fallow lands of Chittagong university campus, Chittagong, Bangladesh. Results showed that sand was the dominant soil particle followed by clay and silt fractions in all soil depths under different vegetation types. Soils of fallow land showed the highest values of bulk density while forest soils had the lowest values at three depths. Acacia forest soil having lowest values of dispersion ratio (DR) is less vulnerable while fallow soil with highest DR values is more vulnerable to soil erosion. The lower pH value at all soil layers in three ecosystems represented that soils under study are acidic in nature. Contents of organic matter, total nitrogen, exchangeable cations (Ca²⁺, Mg²⁺, K⁺ and Na⁺) and cation exchange capacity (CEC) were observed higher in Acacia forest soils compared to vegetable and fallow soils. Only soils of vegetable land had higher level of available phosphorus in three layers than that of other two land covers. The study also revealed that different soil properties were observed in three different vegetation types might be due to variation in vegetation and agronomic practices.

• 한국산림과학회지
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• 제95권5호
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• pp.516-523
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• 2006

Marginal soils such as BRlS (Beach Ridges Interspersed with Swales) soils and ex-tin mining land make up approximately 0.5 million ha or about 2% of Malaysia's land area. In the coastal areas of the east coast of Peninsular Malaysia impoverished sandy BRIS dominates the landscape with most lying idle as there is no national management plan for their utilization. A field study was carried out to see whether mycorrhizal application had any effect on the growth of three exotic Acacia spp., i.e. Acacia auriculiformis, A. mangium and Acacia hybrid (A. auriculiformis ${\times}$ A. mangium) on BRIS soils. Two types of mycorrhizal inoculum, namely, a commercially available arbuscular mycorrhizal inoculum marketed as $MycoGold^{TM}$ and an indigenous ectomycorrhizal Tomentella sp. inoculum were tested. In the initial six months, height growth of all three tree species inoculated with the arbuscular mycorrhizal inoculum was significantly improved compared to the ectomycorrhizal inoculated and uninoculated control plants. The mycorrhizal effect was not evident thereafter and repeated application of the arbuscular mycorrhizal inoculum may be necessary for continued growth enhancement. Of the three species, A. mangium had the highest relative height growth rate over the 24 months on BRlS soils.

• 농업생명과학연구
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• 제50권1호
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• pp.117-124
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• 2016

토양 미생물 군집은 외부 환경변화에 있어 식물 군집보다 더 빨리 반응할 수 있다는 점에서 복원 과정의 초기 지표로 활용될 수 있다. 이런 측면에서 인위적인 교란에 대한 생태계 반응을 측정하고 생태계 복원의 지표를 제공하는 토양 미생물 군집 연구가 증가하고 있는 추세이다. 본 연구는 2012년과 2013년 준공된 이화령과 육십령 백두대간 생태축 복원사업지와 주변 임분에서 각각 토양을 채취하여 16S rRNA 파이로시퀀싱 기법을 이용하여 토양 박테리아 군집을 분석하였다. 문(Phylum) 수준에서의 박테리아 다양성은 이화령이 평균 29.3, 육십령이 평균 32.3으로 나왔고 복원사업지와 주변 임분은 통계적으로 유의한 차이를 보였으나(p<0.01), 지리적 위치(이화령과 육십령 비교)나 토심(0~15cm, 16~30cm 비교)에 따른 유의한 영향은 나타나지 않았다. 검색된 토양 박테리아 중에서 Acidobacteria(37.3%)와 Proteobacteria(31.1%)가 가장 우점적으로 분포하는 것으로 나타났으며, 복원한 토양과 주변 임분에서 이 두 문의 박테리아 다양성 양상은 서로 상반되었다. 즉, 인공적으로 복원된 토양에서는 Proteobacteria가 높은 비율로 나타났고(38.1%, 인근 산림토양에서는 24.2%), 주변 임분에서는 Acidobacteria가 다양한 것으로 나타났다(55.4%, 복원 사업지는 19.2%). 이러한 경향은 토양의 영양상태에 따라 선호하는 박테리아 종류가 다르다는 기존의 연구 결과와 유사하였으며, 특히 Acidobacteria는 산성토양을 선호하는 등 토양산도와 밀접한 연관이 있을 것으로 생각된다. 따라서, 토양 박테리아 군집 특성은 연구지 위치나 토심에 따른 영향보다는 토양복원에 따른 영향이 더 크게 나타났고 이는 향후 토양복원의 성공여부를 정량적으로 모니터링하는데 활용될 수 있을 것으로 기대한다.

• 한국토양비료학회지
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• 제42권별호
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• pp.238-258
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• 2009

• Journal of Plant Biology
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• 제6권3호
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• pp.1-5
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• 1963

서울 부근에 있는 화강암에서 유래된 11 척의 산림군락(정엽수와 활엽수로 대별)밑 임토와 나지의 화학적 성분을 조사하여 군락과의 관계를 비교했다. 화강암 군락의 임토는 정엽수 군락의 임토보다 유효 질소, 초산태 질소, 유효 린산의 함량이 많이 포함되어 있고, 유기물 함량과 염기환능은 위와 반대이었다. 토층에 따른 토양 분석의 유의성은 유효 린산만이 5%에서 나타났고 정엽수와 활엽수의 임토및 나지등 분산분석의 결과에 관한 유의성은 초산태 질소가 5%에서 유기물 함량은 1%에서 나타났다.

• Environmental Engineering Research
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• 제15권3호
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• pp.157-161
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• 2010

Forest soils are often nitrogen-limited, and nitrogen input to forest soils can cause substantial changes in the structure and functions of a soil ecosystem. To determine the effects of nitrogen input on methane oxidation and the microbial enzyme activities, manipulation experiments were conducted using nitrogen addition to soil samples from Mt. Jumbong. Our findings suggested that the addition of nitrogen to the soil system of Mt. Jumbong did not affect the microbial enzyme activities. Conversely, the addition of nitrogen affected the rate of methane oxidation. Inorganic nitrogen in soils can inhibit methane oxidation via several mechanisms, such as substrate competition, toxic effects, and competition with other microbes, but the inhibitory effects are not always the same. In this research, seasonal changes were found to produce different inhibitory factors, and these different responses may be caused from differences in the methantrophic bacteria community structure.

• Journal of Forest and Environmental Science
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• 제32권1호
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• pp.20-26
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• 2016

DTPA (Diethelene-triamine pentaacetic acid) extractable micronutrients of surface soil samples from six different locations of Cox's Bazar and Chittagong districts were studied. All the soils under study were sufficient in DTPA extractable Fe, Mn and Cu contents. The available Zn contents in soils of Dulhazara, Chengchhari and Faissakhali under study were also above the critical limit while soils at Fulchhari, Hasnabad and CU were deficient in available Zn. The study also showed that DTPA extractable Fe content had the significant and positive relationships with clay and soil organic carbon. On the hand, negative and significant relationship was observed between extractable Mn and soil pH while DTPA extractable Zn and Cu were positively and significantly correlated with soil organic carbon of the studied area.