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Temporal-spatial variation and controls of soil respiration in different primary succession stages on glacier forehead in Gongga Mountain, China.

Luo J, Chen Y, Wu Y, Shi P, She J, Zhou P - PLoS ONE (2012)

Bottom Line: Our results showed that there was substantial temporal (coefficient of variation (CV) ranged from 39.3% to 73.9%) and spatial (CV ranged from 12.3% to 88.6%) variation in SR.Q(10) values (ranged from 2.1 to 4.7) increased along the forest succession, and the mean value (3.3) was larger than that of temperate ecosystems, which indicated a general tendency towards higher-Q(10) in colder ecosystems than in warmer ecosystems.Our findings provided valuable information for understanding temporal-spatial variation and controlling factors of SR.

View Article: PubMed Central - PubMed

Affiliation: Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu, China.

ABSTRACT
Soil respiration (SR) is an important process in the global carbon cycle. It is difficult to estimate SR emission accurately because of its temporal and spatial variability. Primary forest succession on Glacier forehead provides the ideal environment for examining the temporal-spatial variation and controlling factors of SR. However, relevant studies on SR are relatively scarce, and variations, as well as controlling factors, remain uncertain in this kind of region. In this study, we used a static chamber system to measure SR in six sites which represent different stages of forest succession on forehead of a temperate glacier in Gongga Mountain, China. Our results showed that there was substantial temporal (coefficient of variation (CV) ranged from 39.3% to 73.9%) and spatial (CV ranged from 12.3% to 88.6%) variation in SR. Soil temperature (ST) at 5 cm depth was the major controlling factor of temporal variation in all six sites. Spatial variation in SR was mainly caused by differences in plant biomass and Total N among the six sites. Moreover, soil moisture (SM), microbial biomass carbon (MBC), soil organic carbon (SOC), pH and bulk density could influence SR by directly or indirectly affecting plant biomass and Total N. Q(10) values (ranged from 2.1 to 4.7) increased along the forest succession, and the mean value (3.3) was larger than that of temperate ecosystems, which indicated a general tendency towards higher-Q(10) in colder ecosystems than in warmer ecosystems. Our findings provided valuable information for understanding temporal-spatial variation and controlling factors of SR.

Show MeSH
Temporal dynamics of SR (A), ST (B) and SM (C) for six sites.SR, ST and SM means soil respiration, soil temperature and soil moisture, respectively. The six sites represent different stages of forest succession on forehead of Hailougou Glacier in Gongga Mountain, China.
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pone-0042354-g002: Temporal dynamics of SR (A), ST (B) and SM (C) for six sites.SR, ST and SM means soil respiration, soil temperature and soil moisture, respectively. The six sites represent different stages of forest succession on forehead of Hailougou Glacier in Gongga Mountain, China.

Mentions: As is shown in Fig. 2A, the patterns of temporal variation of SR were largely the same for the six sites. SR showed a similar single-peak pattern in all six sites in year 2009. SR was higher in the growing season than that in non-growing season. The lowest monthly SR rate was 0.32±0.05 µmol m−2 s−1 occurring at site 1 in January. By contrast, SR rate peaked in June or July in all the sites, with the maximum rate of 6.25±0.93 µmol m−2 s−1 in site 6.


Temporal-spatial variation and controls of soil respiration in different primary succession stages on glacier forehead in Gongga Mountain, China.

Luo J, Chen Y, Wu Y, Shi P, She J, Zhou P - PLoS ONE (2012)

Temporal dynamics of SR (A), ST (B) and SM (C) for six sites.SR, ST and SM means soil respiration, soil temperature and soil moisture, respectively. The six sites represent different stages of forest succession on forehead of Hailougou Glacier in Gongga Mountain, China.
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3412854&req=5

pone-0042354-g002: Temporal dynamics of SR (A), ST (B) and SM (C) for six sites.SR, ST and SM means soil respiration, soil temperature and soil moisture, respectively. The six sites represent different stages of forest succession on forehead of Hailougou Glacier in Gongga Mountain, China.
Mentions: As is shown in Fig. 2A, the patterns of temporal variation of SR were largely the same for the six sites. SR showed a similar single-peak pattern in all six sites in year 2009. SR was higher in the growing season than that in non-growing season. The lowest monthly SR rate was 0.32±0.05 µmol m−2 s−1 occurring at site 1 in January. By contrast, SR rate peaked in June or July in all the sites, with the maximum rate of 6.25±0.93 µmol m−2 s−1 in site 6.

Bottom Line: Our results showed that there was substantial temporal (coefficient of variation (CV) ranged from 39.3% to 73.9%) and spatial (CV ranged from 12.3% to 88.6%) variation in SR.Q(10) values (ranged from 2.1 to 4.7) increased along the forest succession, and the mean value (3.3) was larger than that of temperate ecosystems, which indicated a general tendency towards higher-Q(10) in colder ecosystems than in warmer ecosystems.Our findings provided valuable information for understanding temporal-spatial variation and controlling factors of SR.

View Article: PubMed Central - PubMed

Affiliation: Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu, China.

ABSTRACT
Soil respiration (SR) is an important process in the global carbon cycle. It is difficult to estimate SR emission accurately because of its temporal and spatial variability. Primary forest succession on Glacier forehead provides the ideal environment for examining the temporal-spatial variation and controlling factors of SR. However, relevant studies on SR are relatively scarce, and variations, as well as controlling factors, remain uncertain in this kind of region. In this study, we used a static chamber system to measure SR in six sites which represent different stages of forest succession on forehead of a temperate glacier in Gongga Mountain, China. Our results showed that there was substantial temporal (coefficient of variation (CV) ranged from 39.3% to 73.9%) and spatial (CV ranged from 12.3% to 88.6%) variation in SR. Soil temperature (ST) at 5 cm depth was the major controlling factor of temporal variation in all six sites. Spatial variation in SR was mainly caused by differences in plant biomass and Total N among the six sites. Moreover, soil moisture (SM), microbial biomass carbon (MBC), soil organic carbon (SOC), pH and bulk density could influence SR by directly or indirectly affecting plant biomass and Total N. Q(10) values (ranged from 2.1 to 4.7) increased along the forest succession, and the mean value (3.3) was larger than that of temperate ecosystems, which indicated a general tendency towards higher-Q(10) in colder ecosystems than in warmer ecosystems. Our findings provided valuable information for understanding temporal-spatial variation and controlling factors of SR.

Show MeSH