Long-term trend of precipitation days for southeast Tibetan Plateau, China

Zhang, Xinli; Shun-jiu, Wang

doi:10.2480/agrmet.d-19-00044

Cited by 3 publications

(2 citation statements)

References 31 publications

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“…The MK test is adopted to detect the time series trend, and a positive or negative value of the trend estimator (Z) indicates an increasing or decreasing trend for the test time series [31][32][33][34][35][36][37]. When the absolute value of Z is greater than 1.96 or 2.576, the test time series can be regarded as a statistically significant trend at 95% or 99% confidence level [33,38,39].…”

Section: General Characteristicsmentioning

confidence: 99%

Variations in Maximum and Minimum Temperature in Mount Qomolangma during 1971–2020

Wang

2024

Atmosphere

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Based on the daily maximum and minimum temperature observational data during 1971–2020, the variabilities of the maximum and minimum temperature of Mount Qomolangma are analyzed. The daily maximum temperature is 25.8 °C and the daily minimum temperature is −31.4 °C during the study period in Mount Qomolangma. Overall, there has been an upward trend with decadal laps for both maximum and minimum temperature. On monthly, seasonal, and annual scales, neither maximum temperature nor minimum temperature time series exhibit an increasing trend from 1971 to 2020. The increasing trends in monthly minimum temperature are even more pronounced than those in maximum temperature. Abrupt changes are noted in both monthly, seasonal, and annual maximum and minimum temperature time series. Specifically, an abrupt change in annual maximum temperature occurred in the 1980s, while an abrupt change in annual minimum temperature occurred in the 1990s. Differences between the north and south slope of Mount Qomolangma are evident, with temperature fluctuations of the north slope being more extreme than those of south slope. The seasonal and annual maximum temperature of the north slope is higher than that of the south slope, except for winter, and the seasonal and annual minimum temperatures of the north slope are all lower than those of the south slope. The tendences of maximum and minimum temperatures in the north slope are more dominant than those in the south slope. The findings are beneficial for understanding the characteristics of local climate change on the Tibetan plateau and to underscore the significant role of Mount Qomolangma in the context of global warming.

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Section: General Characteristicsmentioning

confidence: 99%

Variations in Maximum and Minimum Temperature in Mount Qomolangma during 1971–2020

Wang

2024

Atmosphere

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“…However, in Southwest China [11], especially Chengdu Plain, the harvest season of quinoa is often accompanied by high temperatures and high humidity, and Quinoa is extremely vulnerable to PHS if it is not harvested in time or not handled properly after harvested [8,12,13]. PHS will promote the hydrolysis of starch in grain endosperm [8,14,15], the change of protein spatial structure, the damage of seed internal structure which reduce the nutritional value of grain, create a favorable environment for saprophytic fungi, and lead to seed spoilage and deterioration [16] and loss of vitality.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Pre-Harvest Sprouting (PHS) Resistance and Screening of High-Quality Varieties from Thirty-Seven Quinoa (Chenopodium quinoa Willd.) Resources in Chengdu Plain

Pan,

Gao,

Zeng

et al. 2023

Phyton

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Pre-harvest sprouting (PHS) will have a serious effect both on the yield and quality of quinoa (Chenopodium quinoa Willd.). It is crucial to select and breed quinoa varieties with PHS resistance and excellent agronomic traits for guidance production and utilization of quinoa. A comprehensive evaluation of the PHS resistance and agronomic traits of 37 species of quinoa resources was conducted in Chengdu Plain. The evaluation used various methods, including grain germination rate (GR), grain germination index (GI), total spike germination rate (SR), total grain germination index (SI), grey correlation analysis (GCA), cluster analysis and correlation analysis. Results showed significant differences in PHS resistance and agronomic traits amongst the 37 quinoa resources. CDU-23 was most resistant to PHS within 24 h, with a germination rate of 2.67% and 0% according to the GR and SR results, respectively. However, in the same time, CDU-31 showed the maximum susceptibility to PHS based on the SR of 31.07%, while CDU-34 was the most sensitive to PHS according to the GR of 100%. The comprehensive evaluation identified one and nine kinds of high resistance species for grain and whole spike germination, respectively. In both cases, the coefficients of variation (CV) for these parameters were 34.78% and 82.13%, respectively. GCA results showed that the magnitude of the association between each trait and yield in the thirty-seven quinoa resources was in the following order: thousand grain weight > seed length > seed area > seed width. Although the seed weight of CDU-18 reached 3.7010 g, the seed weight of CDU-5 was only 1.6030 g. However, the size of the seeds, their width and area did not correlate with their 1000-grain weight. There was a complex correlation between PHS resistance index and agronomic traits. Based on clustering analysis, thirty-seven quinoa resources were classified into three taxa. It was found that various taxa differed in PHS resistance and agronomic traits. Several comparisons of the aggregated data led to the selection of five varieties of quinoa, of which CDU-2 presented excellent agronomic qualities and strong PHS resistance. This study has provided a reference for breeding excellent quinoa varieties with PHS resistance.

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Variations of extreme temperature in the Mount Qomolangma region in China during 1971–2020

Wang

2023

J. Mt. Sci.

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Long-term trend of precipitation days for southeast Tibetan Plateau, China

Cited by 3 publications

References 31 publications

Variations in Maximum and Minimum Temperature in Mount Qomolangma during 1971–2020

Variations in Maximum and Minimum Temperature in Mount Qomolangma during 1971–2020

Evaluation of Pre-Harvest Sprouting (PHS) Resistance and Screening of High-Quality Varieties from Thirty-Seven Quinoa (Chenopodium quinoa Willd.) Resources in Chengdu Plain

Variations of extreme temperature in the Mount Qomolangma region in China during 1971–2020

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