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Asymmetric effects of daytime and nighttime warming on spring phenology in the temperate grasslands of China
X. J. Shen, B. H. Liu, M. Henderson, L. Wang, Z. F. Wu, H. T. Wu, M. Jiang and X. G. Lu
2018
发表期刊Agricultural and Forest Meteorology
卷号259页码:240-249
其他摘要Understanding the spring phenology of temperate grasslands and its response to climate change are crucial for diagnosing the responses of ecosystem to regional climate change and projecting regional ecosystem carbon exchange. Using NDVI data from 1982 to 2015, this study investigated the changes of the start date of the vegetation growing season (SOS) for the temperate grasslands of China, and explored the possible effects of average monthly T-max, T-min, and total precipitation on the SOS across different grassland vegetation types. We improved on prior studies of climate change in China's temperate zone by focusing only on grasslands unchanged over this extended study period. The results showed that the SOS significantly advanced at a rate of 1.84 days/decade from 1982 to 2015, controlled mainly by spring precipitation and spring and winter temperatures, with differing degrees of influence among vegetation types. On average, an increase of 10 mm in spring precipitation would advance SOS by 1.7 days across the temperate grasslands of China. Although warmer temperatures generally led to advanced SOS, this study revealed for the first time that the seasonal effects of daytime and nighttime warming on the SOS of temperate grasslands in China were asymmetric, with T-max more influential in winter and Tmin more influential in spring. An increase of 1 degrees C in winter T-max and spring T-min would advance SOS by 0.42 and 1.34 days, respectively, compared with effects of 0.24 or 0.64 days for 1 degrees C increases in winter T-min or spring T-max. Given the global asymmetry in daytime and nighttime warming, this study highlights the asymmetric effects of daytime and nighttime warming on the SOS of temperate grasslands in China, and suggests that the impacts of seasonal T-max and T-min should be considered separately in the SOS modules of terrestrial ecosystem models for temperate grasslands. Background and aims Results of studies on plant responses to salt stress often are difficult to compare because different salt parameters were used. Our aim was to compare the effects of different combinations of sodium salts on germination/seedling growth of two forage species and determine which salt solution parameter(s) was(were) most closely related to these responses. Methods Seeds of the legume Medicago sativa and the grass Elymus dahuricus were germinated in different concentrations of saline and sodic salts. Various parameters of the salt solutions were determined, and seed germination and seedling growth metrics were measured.
文献类型期刊论文
条目标识符http://ir.iga.ac.cn/handle/131322/9120
专题湿地生态系统管理学科组
推荐引用方式
GB/T 7714
X. J. Shen, B. H. Liu, M. Henderson, L. Wang, Z. F. Wu, H. T. Wu, M. Jiang and X. G. Lu. Asymmetric effects of daytime and nighttime warming on spring phenology in the temperate grasslands of China[J]. Agricultural and Forest Meteorology,2018,259:240-249.
APA X. J. Shen, B. H. Liu, M. Henderson, L. Wang, Z. F. Wu, H. T. Wu, M. Jiang and X. G. Lu.(2018).Asymmetric effects of daytime and nighttime warming on spring phenology in the temperate grasslands of China.Agricultural and Forest Meteorology,259,240-249.
MLA X. J. Shen, B. H. Liu, M. Henderson, L. Wang, Z. F. Wu, H. T. Wu, M. Jiang and X. G. Lu."Asymmetric effects of daytime and nighttime warming on spring phenology in the temperate grasslands of China".Agricultural and Forest Meteorology 259(2018):240-249.
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