Soil respiration patterns for four major land-use types of the agro-pastoral region of northern China

Rong, Yiming; Ma, Lei; Johnson, Douglas A.; Yuan, Fei

doi:10.1016/j.agee.2015.08.002

Cited by 37 publications

(33 citation statements)

References 39 publications

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“…Soil moisture and air temperature are important environmental factors controlling soil CO 2 flux, but soil temperature has been consistently more strongly correlated with CO 2 flux from grassland soils than soil moisture (Liebig et al, ; Brito et al, ; Rong et al, ). In our study, soil CO 2 flux was positively correlated with both soil moisture and air temperature, but was more strongly correlated with air temperature.…”

Section: Discussionmentioning

confidence: 99%

Long‐Term Grazing Alters Soil Trace Gas Fluxes from Grasslands in the Foothills of the Rocky Mountains, Canada

et al. 2017

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Long-term cattle grazing may degrade grassland soils, but how soil CO 2 , CH 4 and N 2 O fluxes respond to long-term cattle grazing is poorly understood. Therefore, we quantified soil CO 2 , CH 4 and N 2 O fluxes in response to four levels (none, light, heavy, very heavy) of long-term (>65 years) cattle grazing on a rough fescue grassland in the foothills of the Rocky Mountains, Canada over three grazing seasons. The grazed grassland soils emitted 37 to 51% more CO 2 than non-grazed soils. Grazed grassland soils were small CH 4 sinks and small N 2 O sources each season, and their cumulative fluxes were significantly affected by a cattle stocking rate × year interaction, indicating the grazing effect was influenced by environmental conditions. Soil CH 4 uptake was negatively correlated with soil moisture (r = À0·59). The 2013 grazing season had about 41% greater precipitation than average and grazing significantly decreased CH 4 uptake 31 to 38% compared with non-grazed soils. The N 2 O emissions were 122 to 179% greater with heavy and very heavy grazing than none in the wet season, unaffected by grazing in the normal precipitation season and 72% lower with light grazing than none in the dry season. Predicting trace gas fluxes from grazed grassland soils across space and time is difficult because of interactions among weather conditions, edaphic properties and grazing intensity. However, long-term cattle grazing increased soil CO 2 fluxes, while the grazing effect on CH 4 uptake depended on precipitation and the soil N 2 O flux responded as a function of grazing intensity and precipitation.

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Section: Discussionmentioning

confidence: 99%

Long‐Term Grazing Alters Soil Trace Gas Fluxes from Grasslands in the Foothills of the Rocky Mountains, Canada

et al. 2017

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“…This could be partly attributed to the relatively high gas sampling frequency, which is hard to operate in the field, and the relative increase in DOC and DON pools released into the WBF soil at high soil moisture after a long-term freezing treatment (Supplementary Table S3). Compared to the N 2 O flux, the pulse of CO 2 flux from soils during thaw became much weaker and no obvious flush CO 2 flux was even reported by Rong et al (2015) in cropland and grassland. The maximum rates of soil CO 2 flux during thaw in this study (Supplementary Table S2) was within the reported values of 10-151 mg C m -2 h -1 in spruce and Korean pine forest lands (Wu et al, 2010;Yan et al, 2016).…”

Section: Discussionmentioning

confidence: 92%

“…These released substrates can be utilized during nitrification, denitrification, and microbial respiration processes and thus may promote nitrous oxide (N 2 O) and carbon dioxide (CO 2 ) fluxes from soils during spring thaw (Mørkved et al, 2006;Goldberg et al, 2008;Wu et al, 2010). However, no pulse of CO 2 fluxes occurred during autumn and spring freeze-thaw periods in field experiments (Rong et al, 2015) and the stimulus degree of freezing-thawing events on soil N 2 O and CO 2 fluxes varies greatly among recent studies (Kim et al, 2012). This can be contributed to the variations of freezing temperature, freezing-thawing cycles, freezing duration, soil moisture, the availability of carbon (C) and nitrogen (N) substrates and the properties of related microorganisms (Kim et al, 2012;Tang et al, 2016;Xu et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Effect of carbon and nitrogen addition on nitrous oxide and carbon dioxide fluxes from thawing forest soils

Wu¹,

Xu²,

Duan³

et al. 2017

International Agrophysics

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A b s t r a c t. Packed soil-core incubation experiments were done to study the effects of carbon (glucose, 6.4 g C m -2 ) and nitrogen (NH 4 Cl and KNO 3 , 4.5 g N m -2 ) addition on nitrous oxide (N 2 O) and carbon dioxide (CO 2 ) fluxes during thawing of frozen soils under two forest stands (broadleaf and Korean pine mixed forest and white birch forest) with two moisture levels (55 and 80% water-filled pore space). With increasing soil moisture, the magnitude and longevity of the flush N 2 O flux from forest soils was enhanced during the early period of thawing, which was accompanied by great NO 3 --N consumption. Without N addition, the glucose-induced cumulative CO 2 fluxes ranged from 9.61 to 13.49 g CO 2 -C m -2 , which was larger than the dose of carbon added as glucose. The single addition of glucose increased microbial biomass carbon but slightly affected soil dissolved organic carbon pool. Thus, the extra carbon released upon addition of glucose can result from the decomposition of soil native organic carbon. The glucose-induced N 2 O and CO 2 fluxes were both significantly correlated to the glucose-induced total N and dissolved organic carbon pools and influenced singly and interactively by soil moisture and KNO 3 addition. The interactive effects of glucose and nitrogen inputs on N 2 O and CO 2 fluxes from forest soils after frost depended on N sources, soil moisture, and vegetation types.

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“…However, the effects of soil management changes from cropland to grassland on R s have not been consistent among studies, some studies indicate that it increases R s (Frank et al., ; Wang, Liu, et al., ), while other studies show that it reduces R s (Iqbal et al., ; Zhang et al., ). Moreover, the effects of grazing on R s also have no consistent conclusion (Rong et al., ). Therefore, additional studies are needed to clarify the effects of the soil management changes on R s .…”

Section: Introductionmentioning

confidence: 99%

“…Soil management changes can potentially alter soil temperature ( T s ) and soil water content ( S w ) (Chen et al., ; Rong, Ma, Johnson, & Yuan, ; Wang, Gong, et al., ), which are the main abiotic factors affecting R s (Fang & Moncrieff, ; Gomez‐Casanovas, Matamala, Cook, & Gonzalez‐Meler, ), and these two factors affect the productivity and the decomposition rate of soil organic matter (Han et al., ). Temperature sensitivity ( Q 10 ) describes the relationship between R s and temperature and can therefore also be changed with soil management changes (Gong et al., ; Rong et al., ). Furthermore, soil management changes can impact biotic factors, such as net primary production, belowground biomass (BGB), soil organic carbon (SOC) (Deng, Liu, & Shangguan, ; Frank, Liebig, & Tanaka, ; Sheng et al., ; Zhang et al., ), all of which greatly affect R s .…”

Section: Introductionmentioning

confidence: 99%

Responses of soil respiration to soil management changes in an agropastoral ecotone in Inner Mongolia, China

Xue

Tang

2017

Ecology and Evolution

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Studying the responses of soil respiration (R s) to soil management changes is critical for enhancing our understanding of the global carbon cycle and has practical implications for grassland management. Therefore, the objectives of this study were (1) quantify daily and seasonal patterns of R s, (2) evaluate the influence of abiotic factors on R s, and (3) detect the effects of soil management changes on R s. We hypothesized that (1) most of daily and seasonal variation in R s could be explained by soil temperature (T s) and soil water content (S w), (2) soil management changes could significantly affect R s, and (3) soil management changes affected R s via the significant change in abiotic and biotic factors. In situ R s values were monitored in an agropastoral ecotone in Inner Mongolia, China, during the growing seasons in 2009 (August to October) and 2010 (May to October). The soil management changes sequences included free grazing grassland (FG), cropland (CL), grazing enclosure grassland (GE), and abandoned cultivated grassland (AC). During the growing season in 2010, cumulative R s for FG, CL, GE, and AC averaged 265.97, 344.74, 236.70, and 226.42 gC m−2 year−1, respectively. The T s and S w significantly influenced R s and explained 66%–86% of the variability in daily R s. Monthly mean temperature and precipitation explained 78%–96% of the variability in monthly R s. The results clearly showed that R s was increased by 29% with the conversion of FG to CL and decreased by 35% and 11% with the conversion of CL to AC and FG to GE. The factors impacting the change in R s under different soil management changes sequences varied. Our results confirm the tested hypotheses. The increase in Q 10 and litter biomass induced by conversion of FG to GE could lead to increased R s if the climate warming. We suggest that after proper natural restoration period, grasslands should be utilized properly to decrease R s.

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Soil respiration patterns for four major land-use types of the agro-pastoral region of northern China

Cited by 37 publications

References 39 publications

Long‐Term Grazing Alters Soil Trace Gas Fluxes from Grasslands in the Foothills of the Rocky Mountains, Canada

Long‐Term Grazing Alters Soil Trace Gas Fluxes from Grasslands in the Foothills of the Rocky Mountains, Canada

Effect of carbon and nitrogen addition on nitrous oxide and carbon dioxide fluxes from thawing forest soils

Responses of soil respiration to soil management changes in an agropastoral ecotone in Inner Mongolia, China

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