Responses of ecosystem respiration and its components to fertilization in an alpine meadow on the Tibetan Plateau

Jiang, Jing; Zong, Nan; Song, Minghua; Shi, Peili; Ma, Wang; Fu, Gang; Shen, Zhenxi; Zhang, Xianzhou; Ouyang, Hao

doi:10.1016/j.ejsobi.2013.03.001

Cited by 53 publications

(55 citation statements)

References 49 publications

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“…Factors modulating responses of ecosystem and soil respiration to nutrient enrichment In our study, the fact that R ec and R s were positively correlated with plant growth under N + P fertilization in the growing seasons of 3 consecutive years in the alpine meadow ecosystem further confirmed the findings of our previous study (Jiang et al 2013). This also suggested that photosynthetic C fixation plays an important role in respiratory loss (Lenihan et al 2003).…”

Section: Responses Of Ecosystem and Soil Respiration To Nutrient Fertsupporting

confidence: 80%

“…Thus, the contribution of plant growth to R ec and R s is probably low. Recent studies suggested that N enrichment enhanced plant growth in alpine meadows, which was further related to changes in R ec and R s (Fang et al 2012;Jiang et al 2013). Nevertheless, variations in temperature and precipitation in arid alpine meadow ecosystems are often asynchronous during the growing season, resulting in inconsistent seasonal patterns of plant growth (photosynthetic C fixation) with respect to these two environmental parameters.…”

Section: Introductionmentioning

confidence: 99%

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Climatic patterns modulate ecosystem and soil respiration responses to fertilization in an alpine meadow on the Tibetan Plateau, China

Jiang

Shi

Zong

et al. 2014

Ecological Research

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The responses of ecosystem (R ec ) and soil (R s ) respiration to nutrient enrichment have been extensively investigated, aiding our understanding of ecosystem and soil carbon (C) balances in light of global changes. However, the effects of climatic variables and plant growth on CO 2 fluxes under nutrient enrichment remain poorly known. We measured aboveground biomass (Ab), R ec , and R s during three consecutive growing seasons (2010)(2011)(2012) in a Tibetan alpine meadow where a nitrogen (N) and phosphorous (P) fertilization experiment began in 2008. The five treatments were Ctrl (no N or P fertilization), LN and HN (addition of 5 and 10 g N m À2 year À1 , respectively), LN + P and HN + P (the respective N treatments with 5 g P m À2 year À1 added). LN and HN did not affect R ec , R s , or Ab during the three growing seasons, but both N + P treatments increased Ab in all 3 years. However, the effects of N + P on R ec and R s varied among years: N + P increased R ec and R s at most sampling times in 2010 and 2011, but the effect seemed to reach saturation in 2012. Additionally, R ec and R s were positively correlated with Ab in N + P, indicating that enhanced Ab contributed considerably to the observed variation in R ec and R s . Different climate patterns during three seasons drove the inconsistent relationships of CO 2 fluxes with soil temperature and moisture. Our results suggest that temperature and precipitation patterns throughout the growing season are important modulators of CO 2 fluxes under increasing nutrient levels in arid alpine meadow ecosystems.

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Section: Responses Of Ecosystem and Soil Respiration To Nutrient Fertsupporting

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Climatic patterns modulate ecosystem and soil respiration responses to fertilization in an alpine meadow on the Tibetan Plateau, China

Jiang

Shi

Zong

et al. 2014

Ecological Research

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“…However, our results show that the N had no significant effects on R e but a clear seasonal response pattern was detected in each year, which was consistent with recent studies conducted in an Alaskan boreal forest (Allison et al, 2008) and in a Tibetan Plateau alpine meadow (Jiang et al, 2013). One possible explanation for this pattern was that R e was closely related with ANPP and SOM, which also did not respond to N fertilization in our study.…”

Section: Effects Of N Fertilizer Application On Co 2 Fluxessupporting

confidence: 82%

“…One possible explanation for this pattern was that R e was closely related with ANPP and SOM, which also did not respond to N fertilization in our study. The range of seasonal maximum R e in our study (194.1-266.6 mg m −2 h −1 in June) was similar to that in the Tibetan Plateau alpine meadow (about 129.6-259.2 mg m −1 h −1 ) (Kato et al, 2006;Jiang et al, 2013) but the seasonal minimum R e range in our study (2.0-2.8 mg m −2 h −1 in March) was higher than that in Tibetan Plateau alpine meadow (about 1.8 mg m −2 h −1 ) (Kato et al, 2006;Jiang et al, 2013). Based on monthly mean R e flux, we calculated the annual R e in Bayinbuluk alpine grasslands to be about 279.0-403.9 g CO 2 m −2 yr −1 , a lower value than found in European grasslands (1800-6000 g CO 2 m −2 yr −1 ) (Gilmanov et al, 2007).…”

Section: Effects Of N Fertilizer Application On Co 2 Fluxesmentioning

confidence: 50%

Response of carbon dioxide emissions to sheep grazing and N application in an alpine grassland – Part 2: Effect of N application

et al. 2014

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Abstract. Widespread nitrogen (N) enrichment resulting from anthropogenic activities has led to great changes in carbon exchange between the terrestrial biosphere and the atmosphere. Grassland is one of the most sensitive ecosystems to N deposition. However, the effect of N deposition on ecosystem respiration (R e ) in grasslands has been conducted mainly in temperate grasslands, which are limited largely by water availability, with few studies focused on alpine grasslands that are primarily constrained by low temperatures. Failure to assess the magnitude of the response in R e outside the growing season (NGS) in previous studies also limits our understanding of carbon exchange under N deposition conditions. To address these knowledge gaps we used a combination of static closed chambers and gas chromatography in an alpine grassland from 2010 to 2011 to test the effects of N application on ecosystem respiration (R e ) both inside and outside the growing season. There was no significant change in CO 2 emissions under N application. R e outside the growing season was at least equivalent to 9.4 % of the CO 2 fluxes during the growing season (GS). Annual R e was calculated to be 279.0-403.9 g CO 2 m −2 yr −1 in Bayinbuluk alpine grasslands. In addition, our results indicate that soil temperature was the dominant abiotic factor regulating variation in R e in the cold and arid environment. Our results suggest that shortterm N additions exert no significant effect on CO 2 emissions in alpine grassland.

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“…The site is located on the south-facing slope of the Nyainqentanglha Mountains at 4,333 m above sea level in the mid-south of the Tibetan Plateau. A detailed description of the experimental site can be found in Jiang et al (2013). The climate in this site is characterized as the semi-arid continental type.…”

Section: Site Description and Experimental Designmentioning

confidence: 99%

Nitrogen Critical Loads for an Alpine Meadow Ecosystem on the Tibetan Plateau

Zong

Shi

Song

et al. 2015

Environmental Management

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Increasing atmospheric nitrogen (N) deposition has the potential to alter plant diversity and thus the function and stability of terrestrial ecosystems. N-limited alpine ecosystems are expected to be particularly susceptible to increasing N deposition. However, little is known about the critical loads and saturation thresholds of ecosystem responses to increasing N deposition on the Tibetan Plateau, despite its importance to ecosystem management. To evaluate the N critical loads and N saturation thresholds in an alpine ecosystem, in 2010, we treated an alpine meadow with five levels of N addition (0, 10, 20, 40, and 80 kg N ha -1 year -1 ) and characterized plant and soil responses. The results showed that plant species richness and diversity index did not statistically vary with N addition treatments, but they both changed with years. N addition affected plant cover and aboveground productivity, especially for grasses, and soil chemical features. The N critical loads and saturation thresholds, in terms of plant cover and biomass change at the community level, were 8.8-12.7 and 50 kg N ha -1 -year -1 (including the ambient N deposition rate), respectively. However, pronounced changes in soil inorganic N and net N mineralization occurred under the 20 and 40 kg N ha -1 year -1 treatments. Our results indicate that plant community cover and biomass are more sensitive than soil to increasing N inputs. The plant community composition in alpine ecosystems on the Qinghai-Tibetan Plateau may change under increasing N deposition in the future.

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Responses of ecosystem respiration and its components to fertilization in an alpine meadow on the Tibetan Plateau

Cited by 53 publications

References 49 publications

Climatic patterns modulate ecosystem and soil respiration responses to fertilization in an alpine meadow on the Tibetan Plateau, China

Climatic patterns modulate ecosystem and soil respiration responses to fertilization in an alpine meadow on the Tibetan Plateau, China

Response of carbon dioxide emissions to sheep grazing and N application in an alpine grassland – Part 2: Effect of N application

Nitrogen Critical Loads for an Alpine Meadow Ecosystem on the Tibetan Plateau

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