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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
Relationships between mean SR and possible driving factors among sites.SR represented soil respiration; The driving factors were soil temperature (ST) at 5 cm depth (A), litterfall input (B), soil moisture (SM, C), plant biomass (D), total nitrogen (Total N, E), soil organic carbon (SOC, F), microbial biomass carbon (MBC, G), pH (H) and bulk density (I).
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pone-0042354-g007: Relationships between mean SR and possible driving factors among sites.SR represented soil respiration; The driving factors were soil temperature (ST) at 5 cm depth (A), litterfall input (B), soil moisture (SM, C), plant biomass (D), total nitrogen (Total N, E), soil organic carbon (SOC, F), microbial biomass carbon (MBC, G), pH (H) and bulk density (I).

Mentions: Among the six sites, no significant correlation could be detected between mean annual SR rate and mean ST (R2 = 0.49, p = 0.09) (Fig. 7A), which could explain much of the temporal variation in SR for each site. However, SM, which was not a controlling factor of temporal variation in SR, significantly correlated with SR among the six sites (R2 = 0.72, p = 0.02) (Fig. 7C).


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)

Relationships between mean SR and possible driving factors among sites.SR represented soil respiration; The driving factors were soil temperature (ST) at 5 cm depth (A), litterfall input (B), soil moisture (SM, C), plant biomass (D), total nitrogen (Total N, E), soil organic carbon (SOC, F), microbial biomass carbon (MBC, G), pH (H) and bulk density (I).
© Copyright Policy
Related In: Results  -  Collection

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

pone-0042354-g007: Relationships between mean SR and possible driving factors among sites.SR represented soil respiration; The driving factors were soil temperature (ST) at 5 cm depth (A), litterfall input (B), soil moisture (SM, C), plant biomass (D), total nitrogen (Total N, E), soil organic carbon (SOC, F), microbial biomass carbon (MBC, G), pH (H) and bulk density (I).
Mentions: Among the six sites, no significant correlation could be detected between mean annual SR rate and mean ST (R2 = 0.49, p = 0.09) (Fig. 7A), which could explain much of the temporal variation in SR for each site. However, SM, which was not a controlling factor of temporal variation in SR, significantly correlated with SR among the six sites (R2 = 0.72, p = 0.02) (Fig. 7C).

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