Seasonal variations in soil respiration and temperature sensitivity under three land-use types in hilly areas of the Sichuan Basin

Wang, Xiaoguo; Zhu, Bo; Gao, Mengtan; Wang, Yanqiang; Zheng, Xunhua

doi:10.1071/sr07223

Cited by 27 publications

(22 citation statements)

References 48 publications

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“…Both seasonal respiration quotient and Q 10 values at each measuring time indicates that soil CO 2 fluxes in both forest ecosystems are significantly sensitive to temperature. Previous studies have demonstrated that temperature sensitivity of soil respiration (Q 10 ) was affected negatively by soil temperature (Xu and Qi 2001;Wang et al 2008). Our results partly support this conclusion because Q 10 values were relatively small in summer compared with spring and autumn.…”

Section: Discussionsupporting

confidence: 82%

Initial responses of soil CO2 efflux and C, N pools to experimental warming in two contrasting forest ecosystems, Eastern Tibetan Plateau, China

Wan

Xiong

et al. 2010

Plant Soil

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Alpine ecosystems are harsh environments where low temperatures are generally a limiting factor. Predicted global warming is thus expected to have a profound impact on alpine ecosystems in the future. This study was conducted to compare the effect of experimental warming on soils in two contrasting forest ecosystems (a dragon spruce plantation and a natural forest) using the open top chamber (OTC) method in the Eastern Tibetan Plateau of China. The OTC enhanced average daily mean soil temperatures by 0.61°C (plantation) and 0.55°C (natural forest), respectively, throughout the growing season. Conversely, soil volumetric moisture declined by 4.10% in the plantation and by 2.55% in the natural forest. Across all measuring dates, warming increased average soil CO 2 efflux by 10.6% in the plantation and by 15.4% in the natural forest. However, elevated temperatures did not affect the respiration quotient in either forest. Two-stage sulfuric acid hydrolysis was used to quantify labile and recalcitrant C and N fractions in the two contrasting soils. Warming significantly reduced labile C and N fractions in both ecosystems but did not influence the total, recalcitrant and microbial biomass C and N pools. Labile C, N and microbial biomass C showed significant interactions in warming × forest type × season. Irrespective of warming treatments, all measured pools were significantly larger in the natural forest compared to the plantation. Taken together, our results indicate that the lowered soil labile C and N pools may be induced by the increased soil CO 2 efflux. The responses of the natural forest soil were more sensitive to experimental warming than those of the plantation. We conclude that reforestation dramatically lowers soil C and N pools, further affecting the responses of forest soils to future global warming.

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Section: Discussionsupporting

confidence: 82%

Initial responses of soil CO2 efflux and C, N pools to experimental warming in two contrasting forest ecosystems, Eastern Tibetan Plateau, China

Wan

Xiong

et al. 2010

Plant Soil

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“…The high exponential positive correlation of R S with ST reported in this study indicates that R S was strongly influenced by seasonal temperature change for all three subalpine ecosystems. Similar findings have been reported in numerous previous studies on different ecosystems (Raich and Schlesinger 1992;Wang et al 2008;Yan et al 2009). The magnitude of temporal variation in R S due to ST varied from 55% at clear-cut land to 61% at primary forest (Table 3).…”

Section: Effects Of Soil Temperature and Soil Moisture On Soil Respirsupporting

confidence: 80%

Comparison of soil respiration among three different subalpine ecosystems on eastern Tibetan Plateau, China

Chen

Luo

et al. 2014

Soil Science and Plant Nutrition

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The pattern of soil respiration and its responsible factors are still unclear in subalpine ecosystems. In this study, we used a static chamber system to measure soil respiration in a primary Abies fabri (Masters) Craib forest, a secondary A. fabri forest and a clear-cut land on Gongga Mountain, east of Tibetan Plateau in China. Our results showed there were substantial diurnal and temporal variations in these three subalpine ecosystems. The diurnal coefficient of variation (CV) of soil respiration was lowest in primary forest (20.5%), and highest in clear-cut land (40.4%). Diurnal patterns of soil respiration were generally associated with soil temperature at 5 cm for all the three systems. The temporal CV was lowest in secondary forest (55.6%), and highest in clear-cut land (82.8%). Soil temperature at 5 cm depth was the major factor controlling 55-61% of temporal variation of soil respiration. The temperature sensitivity (Q10 value) was higher in clear-cut land (Q10 = 6.7) than that in primary forest (3.7) and secondary forest (3.0), indicating that soil respiration in clear-cut land was more sensitive to temperature change. Annual soil respiration was 3330.2 g carbon dioxide (CO 2 ) m −2 year −1, 2358.9 g CO 2 m −2 year −1 and 4162.8 g CO 2 m −2 year −1 for primary forest, secondary forest and clear-cut land, respectively. Our findings provided valuable information for understanding the effect of forest ecosystem change and land management on soil respiration in highelevation subalpine ecosystems.

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“…Land use change effects on soil respiration have not been extensively studied (Carlisle et al 2006;Wang et al 2008), especially with respect to the change from agricultural to short-rotation (20 years or less) plantations as is found in our study area. Saurette et al (2008) found no effect on CO 2 emissions in 2006 in the first year after land use change from barley (Hordeum vulgare L.) to Walker poplar (Populus deltoides × Populus × petrowskyana var.…”

Section: Introductionmentioning

confidence: 90%

Soil respiration and its temperature sensitivity in agricultural and afforested poplar plantation systems in northern Alberta

2016

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The effect of land use change from agricultural to short rotation woody crops on soil respiration and its temperature sensitivity is not fully understood. We studied the effect of land use change on soil respiration, in a factorial experiment, 4 years after converting an agricultural field to a Walker poplar (Populus deltoides × Populus × petrowskyana var. Walker) plantation in the boreal region of northeastern Alberta. Overall, total soil respiration was greater in the agricultural plots (planted to alfalfa, Medicago sativa L.) than in the poplar plots. Soil respiration and soil temperature at the 10-cm depth in both land uses had similar seasonal and diurnal variations. The season-long temperature sensitivity (Q 10 ) of daily and nighttime soil respiration in the alfalfa plots was greater than that in the poplar plots, with Q 10 values of 5.4 vs. 4.9, respectively. Our data also show that, 4 years after land use conversion, the heterotrophic respiration was smaller in the poplar plots than in the adjacent agricultural plots, indicating potential benefits of plantation establishment in reducing heterotrophic respiration. However, the temperature sensitivity of soil respiration based on monthly nighttime rates, which minimizes the plant phenological influences, was greater in the poplar plantation, suggesting that soil respiration could become greater in the poplar plantation under a future warmer climate. We conclude that establishment of poplar plantations, which are known to have a fast rate of biomass production for long-term carbon storage, may help mitigate climate change by reducing heterotrophic and total soil respiration in the Canadian boreal region, but the long-term implications (e.g., changes in the temperature sensitivity of soil respiration over time) need to be further studied.

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Seasonal variations in soil respiration and temperature sensitivity under three land-use types in hilly areas of the Sichuan Basin

Cited by 27 publications

References 48 publications

Initial responses of soil CO2 efflux and C, N pools to experimental warming in two contrasting forest ecosystems, Eastern Tibetan Plateau, China

Initial responses of soil CO2 efflux and C, N pools to experimental warming in two contrasting forest ecosystems, Eastern Tibetan Plateau, China

Comparison of soil respiration among three different subalpine ecosystems on eastern Tibetan Plateau, China

Soil respiration and its temperature sensitivity in agricultural and afforested poplar plantation systems in northern Alberta

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