S-Space College of Agriculture and Life Sciences (농업생명과학대학) Dept. of Food and Animal Biotechnology (식품·동물생명공학부) Theses (Master's Degree_식품·동물생명공학부)
Temporal effects of nitrogen application rate on soil biomass production and nitrogen uptake efficiency of red pepper under elevated atmospheric CO₂and temperature
상승CO₂와 온도 대기 조건에서 고추의 질소 흡수율과 부동화의 영향
- Issue Date
- 서울대학교 대학원
- 고추; red pepper; 15N-요소; 15N-urea; CO2농도증가; elevated CO2; 온도증가; elevated temperatureFertilizer efficiency; 비료흡수효율; immobilization; 부동화
- Thesis(master`s)--서울대학교 대학원 :농생명공학부,2005.
- To investigate temporal effects of nitrogen application rate on soil biomass
production and nitrogen uptake efficiency of red pepper (Capsicum annuum L. cv.
Manitta) under elevated atmospheric CO2 and temperature, the plant receiving
nitrogen fertilizer in the rate of 180 and 360 kg N ha-1 was grown for 120 days
after transplanting (DAT) in the pot within CO2- and temperature-controlled
glass chamber. Each chamber consists of four units: ambient CO2 and temperature,
elevated CO2 and ambient temperature, ambient CO2 and elevated temperature,
elevated CO2 and temperature. Additional inputs were applied with the same
amount at 60 DAT. All treatments were triplicate. Plant and soil samples were
collected at 40, 80, 120 DAT. At 40 DAT dry mass was significantly increased by
elevated CO2 and temperature for N2. For N1, the elevated temperature increased
dry mass, while it was suppressed under elevated CO2. At 80 DAT, there was only
significant CO2¡¿N interaction. At 120 DAT, elevated CO2 decreased significantly
dry matter. At 40 DAT elevated CO2 increased total nitrogen contents
significantly for N1 and N2 to 15%. However effect of elevated temperature was
insignificant on total N. At 80 DAT, total nitrogen of plant was reduced by 13%
regardless of temperature for N1, but for N2 total nitrogen increased. At 120
DAT, for ambient temperature, elevated CO2 significantly reduced total nitrogen
by 30 and 20% at N1 and N2, while elevated CO2 and temperature reduced total
nitrogen by 39 and 41% for N1 and N2. The trend of nitrogen derived from urea
and nitrogen derived form soil influenced by CO2 and temperature was similar to
that of total nitrogen. Elevated CO2 influenced similarly on the dry mass of
stem and root. As the fertilization of nitrogen increased, dry mass due to
elevated CO2 showed great increment. The response to elevated temperature was
also similar. In contrast, the response of nitrogen in stem and root at each
sampling was not similar. During the plant growth, although N contents of stem
increased but after 80 DAT decreased regardless of CO2, under elevated CO2 high
N contents was observed. However N contents of root under elevated CO2 increased
successively and was higher that of root than under ambient CO2. In the end
elevated CO2 reduced dry mass and N contents of leaf and fruit significantly.
The elevation of temperature under elevated CO2 condition reduced dry mass and N
contents of fruit and leaf. And similar response same as response to fruit and
leaf was also observed for fertilizer efficiency. The elevation of CO2
concentration significantly increased 2M KCl non-extractable N from 18 to 47%.
Elevated temperature didn¡¯t affect 2M KCl non-extractable N significantly,
except for 40 DAT. Nitrogen deficiency due to enhanced immobilization and
stimulated plant growth under elevated CO2 can induce leaf senescence. Because
nitrogen released from senescing leaves was more remobilized into vegetative
parts than reproductive part, we suggested that sink demand of vegetative parts
for nitrogen increased.
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