Limits...
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
Location of study area.Location of Gongga Mountain (A), map of Hailougou Glacier (B) and approximate location of study sites (C). The dotted curve in panel C was adapted from Li et al. [24].
© Copyright Policy
Related In: Results  -  Collection


getmorefigures.php?uid=PMC3412854&req=5

pone-0042354-g001: Location of study area.Location of Gongga Mountain (A), map of Hailougou Glacier (B) and approximate location of study sites (C). The dotted curve in panel C was adapted from Li et al. [24].

Mentions: Gongga Mountain (29°20′–30°20′N, 101°30′–102°15′E, 7556 m), located in the south-eastern fringe of Tibetan Plateau, is the highest peak in the eastern part of the Tibetan Plateau, and is one of the easternmost glacier areas in China (Fig. 1A). There are up to 74 glaciers distributed around Gongga Mountain, and Hailuogou Glacier, where our study was carried out, is the biggest one. Hailuogou Glacier is one of China’s monsoonal temperate glaciers, located on the east slope of Gongga Mountain, with the area of 25 km2. The regional climate is dominated by South Asian summer monsoon [24]. The mean annual air temperature is 3.8°C, the minimum mean air temperature is −4.3°C in January, and the maximum mean air temperature is 11.9°C in July. The total annual precipitation is about 2000 mm, most of which occurs from June to September.


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)

Location of study area.Location of Gongga Mountain (A), map of Hailougou Glacier (B) and approximate location of study sites (C). The dotted curve in panel C was adapted from Li et al. [24].
© Copyright Policy
Related In: Results  -  Collection

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

pone-0042354-g001: Location of study area.Location of Gongga Mountain (A), map of Hailougou Glacier (B) and approximate location of study sites (C). The dotted curve in panel C was adapted from Li et al. [24].
Mentions: Gongga Mountain (29°20′–30°20′N, 101°30′–102°15′E, 7556 m), located in the south-eastern fringe of Tibetan Plateau, is the highest peak in the eastern part of the Tibetan Plateau, and is one of the easternmost glacier areas in China (Fig. 1A). There are up to 74 glaciers distributed around Gongga Mountain, and Hailuogou Glacier, where our study was carried out, is the biggest one. Hailuogou Glacier is one of China’s monsoonal temperate glaciers, located on the east slope of Gongga Mountain, with the area of 25 km2. The regional climate is dominated by South Asian summer monsoon [24]. The mean annual air temperature is 3.8°C, the minimum mean air temperature is −4.3°C in January, and the maximum mean air temperature is 11.9°C in July. The total annual precipitation is about 2000 mm, most of which occurs from June to September.

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