Background: In ecosystem carbon cycle studies, distinguishing between $CO_2$ emitted by roots and by microbes remains very difficult because it is mixed before being released into the atmosphere. Currently, no method for quantifying root and microbial respiration is effective. Therefore, ...
Background: In ecosystem carbon cycle studies, distinguishing between $CO_2$ emitted by roots and by microbes remains very difficult because it is mixed before being released into the atmosphere. Currently, no method for quantifying root and microbial respiration is effective. Therefore, this study investigated the relationship between soil respiration and underground root biomass at varying distances from the tree and tested possibilities for measuring root and microbial respiration. Methods: Soil respiration was measured by the closed chamber method, in which acrylic collars were placed at regular intervals from the tree base. Measurements were made irregularly during one season, including high temperatures in summer and low temperatures in autumn; the soil's temperature and moisture content were also collected. After measurements, roots of each plot were collected, and their dry matter biomass measured to analyze relationships between root biomass and soil respiration. Results: Apart from root biomass, which affects soil's temperature and moisture, no other factors affecting soil respiration showed significant differences between measuring points. At each point, soil respiration showed clear seasonal variations and high exponential correlation with increasing soil temperatures. The root biomass decreased exponentially with increasing distance from the tree. The rate of soil respiration was also highly correlated exponentially with root biomass. Based on these results, the average rate of root respiration in the soil was estimated to be 34.4% (26.6~43.1%). Conclusions: In this study, attempts were made to differentiate the root respiration rate by analyzing the distribution of root biomass and resulting changes in soil respiration. As distance from the tree increased, root biomass and soil respiration values were shown to strongly decrease exponentially. Root biomass increased logarithmically with increases in soil respiration. In addition, soil respiration and underground root biomass were logarithmically related; the calculated root-breathing rate was around 44%. This study method is applicable for determining root and microbial respiration in forest ecosystem carbon cycle research. However, more data should be collected on the distribution of root biomass and the correlated soil respiration.
Background: In ecosystem carbon cycle studies, distinguishing between $CO_2$ emitted by roots and by microbes remains very difficult because it is mixed before being released into the atmosphere. Currently, no method for quantifying root and microbial respiration is effective. Therefore, this study investigated the relationship between soil respiration and underground root biomass at varying distances from the tree and tested possibilities for measuring root and microbial respiration. Methods: Soil respiration was measured by the closed chamber method, in which acrylic collars were placed at regular intervals from the tree base. Measurements were made irregularly during one season, including high temperatures in summer and low temperatures in autumn; the soil's temperature and moisture content were also collected. After measurements, roots of each plot were collected, and their dry matter biomass measured to analyze relationships between root biomass and soil respiration. Results: Apart from root biomass, which affects soil's temperature and moisture, no other factors affecting soil respiration showed significant differences between measuring points. At each point, soil respiration showed clear seasonal variations and high exponential correlation with increasing soil temperatures. The root biomass decreased exponentially with increasing distance from the tree. The rate of soil respiration was also highly correlated exponentially with root biomass. Based on these results, the average rate of root respiration in the soil was estimated to be 34.4% (26.6~43.1%). Conclusions: In this study, attempts were made to differentiate the root respiration rate by analyzing the distribution of root biomass and resulting changes in soil respiration. As distance from the tree increased, root biomass and soil respiration values were shown to strongly decrease exponentially. Root biomass increased logarithmically with increases in soil respiration. In addition, soil respiration and underground root biomass were logarithmically related; the calculated root-breathing rate was around 44%. This study method is applicable for determining root and microbial respiration in forest ecosystem carbon cycle research. However, more data should be collected on the distribution of root biomass and the correlated soil respiration.
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문제 정의
The purpose of this study was to investigate the relationship between the biomass of roots and the level of soil respiration at the base of trees in addition to comparing the various methods applied in the past and the possibility of applying them here. The distribution characteristics of the root biomass and the root respiration values at various distances from the base of the tree were therefore collected and analyzed.
제안 방법
The measurement point at 420 cm, where no roots are present, was set as the control to assess pure heterotrophic respiration. Also, it was used to calculate the ratio of root respiration to soil respiration.
Various classification methods have been attempted to distinguish them, but a clear and easily applicable method has not been established yet. In this study, we attempted to determine the root volume by analyzing the distribution of root biomass and the change in soil respiration according to the distance from the base of the tree. The results showed that the underground distribution of the roots of trees showed a tendency to decrease exponentially with increasing distance from the base of the trees and to decrease with increasing distance.
The author conceived the study, collected the data, interpreted the results, and wrote the manuscript. The author read and approved the final manuscript.
The purpose of this study was to investigate the relationship between the biomass of roots and the level of soil respiration at the base of trees in addition to comparing the various methods applied in the past and the possibility of applying them here. The distribution characteristics of the root biomass and the root respiration values at various distances from the base of the tree were therefore collected and analyzed.
대상 데이터
2006). Seven acrylic collars (diameter 16 cm) were installed at regular intervals of 50 cm at distances of 120 to 420 cm from the tree base. Collars were fixed by inserting them up to a depth of 5 cm.
This study was carried out on young seedlings of maple (Acer palmatum) in Korea’s central area (N 37° 25′82″, E 122° 05′ 36″), which had remained undisturbed for about 40 years.
이론/모형
Soil respiration was measured by the closed chamber method (Suh et al. 2006). Seven acrylic collars (diameter 16 cm) were installed at regular intervals of 50 cm at distances of 120 to 420 cm from the tree base.
성능/효과
Also, soil respiration and root volume were logarithmically related, and the proportion of root respiration rate in soil respiration was calculated to be about 34.4%. This proportion was obtained from a limited number of samples, and it is necessary to verify its accuracy.
Over the entire measurement period, the level of soil respiration was highest on August 15, with high values of 1998.3, 1601.9, and 1310.3 mg CO2 m−2 h−1 at 120, 170, and 220 cm, respectively.
In this study, we attempted to determine the root volume by analyzing the distribution of root biomass and the change in soil respiration according to the distance from the base of the tree. The results showed that the underground distribution of the roots of trees showed a tendency to decrease exponentially with increasing distance from the base of the trees and to decrease with increasing distance.
후속연구
This proportion was obtained from a limited number of samples, and it is necessary to verify its accuracy. However, considering that the purpose of this study was to examine whether the new classification method is applicable, if additional research confirms the results, it may be considered to be highly so.
2012). However, since the tree size in this study is very limited, more research will be necessary, including the collection and analysis of additional data on different tree species, tree sizes, and cluster densities.
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