Temperature sensitivity of nutrient release from dung along elevation gradient on the Qinghai–Tibetan plateau

Xu, Guangping; Chao, Zengguo; Wang, Shiping; Hu, Yigang; Zhang, Zhenghua; Duan, Jichuang; Chang, Xiaofeng; Su, Ailing; Luo, Caiyun; Li, Yingnian; Du, Mingyuan

doi:10.1007/s10705-009-9311-6

Cited by 19 publications

(13 citation statements)

References 31 publications

(33 reference statements)

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“…Using this approach, some confounding factors (e.g., root exudates, soil moisture, and microbial community) may affect the results of SOC decomposition to some degree. However, our analysis and results from other studies indicate that effects of experimental warming on soil physical properties, soil chemistry, and other soil characteristics are not substantial (Wan, Yuan, et al., ; Xu et al., ; Xue, Luo, Zhou, Sherry, & Jia, ). As a consequence, the confounding effects of these factors on Q 10 values should be small.…”

Section: Methodsmentioning

confidence: 44%

Temperature sensitivity of soil organic carbon decomposition increased with mean carbon residence time: Field incubation and data assimilation

Zhou

Luo

2018

Global Change Biology

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Temperature sensitivity of soil organic carbon (SOC) decomposition is one of the major uncertainties in predicting climate-carbon (C) cycle feedback. Results from previous studies are highly contradictory with old soil C decomposition being more, similarly, or less sensitive to temperature than decomposition of young fractions. The contradictory results are partly from difficulties in distinguishing old from young SOC and their changes over time in the experiments with or without isotopic techniques. In this study, we have conducted a long-term field incubation experiment with deep soil collars (0-70 cm in depth, 10 cm in diameter of PVC tubes) for excluding root C input to examine apparent temperature sensitivity of SOC decomposition under ambient and warming treatments from 2002 to 2008. The data from the experiment were infused into a multi-pool soil C model to estimate intrinsic temperature sensitivity of SOC decomposition and C residence times of three SOC fractions (i.e., active, slow, and passive) using a data assimilation (DA) technique. As active SOC with the short C residence time was progressively depleted in the deep soil collars under both ambient and warming treatments, the residences times of the whole SOC became longer over time. Concomitantly, the estimated apparent and intrinsic temperature sensitivity of SOC decomposition also became gradually higher over time as more than 50% of active SOC was depleted. Thus, the temperature sensitivity of soil C decomposition in deep soil collars was positively correlated with the mean C residence times. However, the regression slope of the temperature sensitivity against the residence time was lower under the warming treatment than under ambient temperature, indicating that other processes also regulated temperature sensitivity of SOC decomposition. These results indicate that old SOC decomposition is more sensitive to temperature than young components, making the old C more vulnerable to future warmer climate.

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Section: Methodsmentioning

confidence: 44%

Temperature sensitivity of soil organic carbon decomposition increased with mean carbon residence time: Field incubation and data assimilation

Zhou

Luo

2018

Global Change Biology

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“…, Xu et al. ). The results in this experiment showed the influence of mean monthly temperature and precipitation on sheep live weight gain ( R 2 = 0.63–0.67 and 0.53–0.64, respectively), indicating a strong link with livestock production.…”

Section: Discussionmentioning

confidence: 99%

Grazing management options for restoration of alpine grasslands on the Qinghai‐Tibet Plateau

et al. 2018

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In an attempt to alleviate the problem of grassland degradation on the Qinghai‐Tibet Plateau in China, state and local authorities in 2003, initiated the “Retire Livestock and Restore Pastures” ecological engineering program, requiring the use of enclosure fencing to enable grazing exclusion and rotational grazing. A five‐year controlled grazing experiment was conducted to determine the effects of this program on (1) sheep live weight gain; and (2a) standing herbage biomass; and (2b) species diversity. Effects of temporal within‐year variation in precipitation and temperature on livestock productivity, standing herbage biomass, and species diversity were also investigated. At the end of 5 yr, grazing exclusion showed no significant difference in standing herbage biomass or in species diversity, compared with either continuous grazing or rotational grazing. Rotational grazing at the high stocking rate significantly promoted sheep live weight gain per hectare, but not per sheep; neither standing herbage biomass, nor species diversity, whether under continuous (i.e., traditional) or rotational grazing, showed a significant difference. Under rotational grazing, higher standing herbage biomass and species diversity were required to maintain or increase sheep liveweight, compared with continuous grazing. Temporal distribution of precipitation and temperature had more influence on alpine grassland parameters, than did grazing. Results of this study suggest that herders’ local traditional knowledge and expertise might be useful in modifying Government guidelines to fine tune grazing management with the dynamics of the alpine meadow ecosystem, and that it is important to consider equilibrium and non‐equilibrium theory in formulating a policy which benefits both herders and grassland. Traditional continuous grazing at a carefully chosen light stocking rate appears to be the most appropriate way to manage livestock and grassland in this region.

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“…Climatic conditions play dominant roles in shaping species assembly of Tibetan alpine grasslands (Xu et al, 2010;Yu et al, 2010). Grazing exclusion indeed can impose certain assembly rules on alpine grassland communities; however, the underlying mechanism is still unclear.…”

Section: Discussionmentioning

confidence: 99%

“…It affects species composition not only because of animals' selective grazing behavior, but also because of plants' differential responses to being grazed (Tilman et al, 1997;Olff and Ritchie, 1998), and thus decreases foliar biomass with livestock rate increasing (Christiansen and Svejcar, 1988). Alpine grasslands on the Qinghai-Tibetan Plateau are very sensitive to natural climate changes (White et al, 2000;Chou et al, 2008;Xu et al, 2010) and grazing disturbance (Zhou et al, 2006;Wei et al, 2008;Cao et al, 2011). There most alpine grasslands are still traditionally grazed by yaks and/or sheep of single or multi-families (Zhou et al, 2006;Cao et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Effects of Grazing Exclusion on Plant Functional Group Diversity of Alpine Grasslands Along a Precipitation Gradient on the Northern Tibetan Plateau

Shen

Shi

et al. 2014

Arctic, Antarctic, and Alpine Research

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Temperature sensitivity of nutrient release from dung along elevation gradient on the Qinghai–Tibetan plateau

Cited by 19 publications

References 31 publications

Temperature sensitivity of soil organic carbon decomposition increased with mean carbon residence time: Field incubation and data assimilation

Temperature sensitivity of soil organic carbon decomposition increased with mean carbon residence time: Field incubation and data assimilation

Grazing management options for restoration of alpine grasslands on the Qinghai‐Tibet Plateau

Effects of Grazing Exclusion on Plant Functional Group Diversity of Alpine Grasslands Along a Precipitation Gradient on the Northern Tibetan Plateau

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