Changes in Pan Evaporation and Their Attribution to Climate Factors in the Zoige Alpine Wetland, the Eastern Edge of the Tibetan Plateau (1969–2014)

Zhao, Ning; Gou, Shaohua; Zhang, Beibei; Yu, Yanhua; Han, Songjun

doi:10.3390/w9120971

Cited by 15 publications

(7 citation statements)

References 44 publications

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“…In fact, they found daily temperature range, sunshine duration, and average wind speed to be the main influencing factors of pan evaporation, and even the determinative factors of its trend. However, air temperature and vapor pressure are the major factors impacting pan evaporation in Zoige Plateau alpine wetland of eastern Tibetan region Zhao et al [54]. Thus, despite the difference in climate variables considered in searching for pan evaporation influencing factors, wind speed, sunshine duration, and temperature are found to be the main drivers of pan evaporation.…”

Section: Discussionmentioning

confidence: 99%

Change in Climate Extremes and Pan Evaporation Influencing Factors over Ouémé Delta in Bénin

Houngue

Lawin

Moumouni³

et al. 2018

Climate

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This work focuses on trend analysis of rainfall, evaporation, temperature, relative humidity, wind speed, and sunshine duration over the Ouémé Delta in Bénin. Eight temperature based indices and fifteen rainfall based indices are computed from 1960 to 2016. Moreover, maximum 1, 2, 3, 5, and 10 days precipitation indices were computed at the monthly scale. Trends are detected at 0.05 confidence level, using a combination of Mann-Kendall and prewhitened Mann-Kendall test. Partial correlation and stepwise regression are used to detect the set of meteorological variables that influence pan evaporation in Ouémé Delta. Results showed intensification of heavy rainfall over Ouémé Delta. Moreover, a significant increasing trend is detected in temperature. As consequence, diurnal temperature significantly decreases as proof of the global warming. Average pan evaporation showed a significant slither increasing trend over the area. Change in pan evaporation can be explained by wind speed and sunshine duration that hold almost 50% of pan evaporation variance. As future temperature is going to be increasing, pan evaporation may increase considerably. So, adaptation measures have to be reinforced in the Ouémé Delta area where farmer are used to rainfed agriculture for food security. Moreover, Ouémé Delta plan have to be developed for it resources sustainability.

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Section: Discussionmentioning

confidence: 99%

Change in Climate Extremes and Pan Evaporation Influencing Factors over Ouémé Delta in Bénin

Houngue

Lawin

Moumouni³

et al. 2018

Climate

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“…The alpine meadow (33°55′ N, 102°09′ E) is located on the Hequ horse farm in the Gansu Province, at an elevation of approximately 3,440 m. The Zoige Plateau displays a typical alpine humid and semi‐humid continental monsoon climate, and it is in one of the zones of the Yellow River Basin that presents abundant precipitation (Bai et al., 2013). Mean annual precipitation is in the range of 600–800 mm and the average air temperature is approximately 0.6–1.2 °C (Zhao et al., 2017). The vegetation presents an average height of about 0.2 m in the growing season, occupies 95% of the meadow, and is dominated by Kobresia setchwanensis and Elymus nutans (Su et al., 2018a).…”

Section: Methodsmentioning

confidence: 99%

Comparison of eddy covariance and automatic chamber‐based methods for measuring carbon flux

Shi

Zhou

et al. 2022

Agronomy Journal

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An automatic chamber (AC) is an alternative method to the eddy covariance (EC) technique for estimating of CO2 fluxes. However, few direct comparisons between two techniques have been performed on nature alpine meadows. In order to determine diurnal pattern of net ecosystem exchange (NEE) of CO2 in summer on alpine meadows, and test the NEE measurement performance of AC under site conditions, we conducted simultaneous measurements of NEE using both EC and AC methods. The NEEAC can be estimated with the information from the initial slope of the time series of CO2 mixing ratio. We found that the application of linear regression, when photosynthesis processes were considered, could lead to serious deviations, even if closure times were short. The linear regression, however, was adequate for estimating CO2 fluxes when photosynthesis processes were not involved in, at least for short chamber closing times. Using appropriate fitting method, the fluxes of AC were relatively close to that of EC, but presented a daytime underestimation and nighttime overestimation. With the subsequent friction velocity (u*) filtering (

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“…(Carex muliensis , Carex lasiocarpa andCarex meyeriana ). However, since the early 1960s, these marshes have occurred a regressive succession from original marsh to marsh meadow, meadow, desertified meadow with "black beach" due to climate change, rodents and human activities (Li et al, , 2019Huo et al 2013;Zhao et al, 2017b). Taking comprehensively into account the diagnostic indices of the hydrologic conditions, dominant plant community and external disturbance (Huo et al, 2013;Wu et al, 2015), we divided degraded marshes into lightly degraded marsh (LDM), moderately degraded marsh (MDM) and heavily degraded marsh (HDM) according to the grading criteria of the degradation of relatively pristine marsh (RPM) (Table 1).…”

Section: Study Area and Marsh Degradation Gradientmentioning

confidence: 99%

Transformation of phosphorus forms and its regulation on phosphorus availability across differently degraded marsh soils

Zhang

Luo

et al. 2022

Preprint

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Soil phosphorus (P) is an essential nutrient that controls wetland productivity and ecological functions. However, the effects of soil P forms on P availability during wetland degradation are relatively unknown. Soil samples from differently degraded marshes, including relatively pristine marsh (RPM), lightly degraded marsh (LDM), moderately degraded marsh (MDM), and heavily degraded marsh (HDM), were collected to investigate the changes in soil P forms and its regulation on P availability in the Zoige Plateau, China. We observed that compared with RPM, the main changes in total P concentration were a significant increase of 31.6%–44.2% in the 0–30 cm soil layers of LDM and MDM, and the available P concentration increased in LDM and MDM but decreased in HDM with a lower P activation coefficient. Marsh degradation increased the concentration and proportion of dicalcium phosphates, P occluded in iron hydroxides, and organic P but decreased those of iron oxide surfaces adsorbed P and apatite P. Soil available P was mainly related to organic P and P non-occluded in iron oxide minerals that might also be non-negligible direct source of available P. The transformation from apatite P to organic P was an important regulation mechanism of P availability in soils during marsh degradation. This study revealed the risk of P limitation in heavily degraded marsh soils and established the mechanism by which marsh degradation significantly influences soil P availability. Therefore, some measure of on improving P availability should be implement for the ecological restoration of heavily degraded marsh in the future, such as grazing exclusion and the application of organic fertiliser.

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Changes in Pan Evaporation and Their Attribution to Climate Factors in the Zoige Alpine Wetland, the Eastern Edge of the Tibetan Plateau (1969–2014)

Cited by 15 publications

References 44 publications

Change in Climate Extremes and Pan Evaporation Influencing Factors over Ouémé Delta in Bénin

Change in Climate Extremes and Pan Evaporation Influencing Factors over Ouémé Delta in Bénin

Comparison of eddy covariance and automatic chamber‐based methods for measuring carbon flux

Transformation of phosphorus forms and its regulation on phosphorus availability across differently degraded marsh soils

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