Responses of seedling growth and biomass allocation of Artemisia ordosica to precipitation and precipitation interval
Received date: 2021-04-05
Revised date: 2021-04-27
Online published: 2021-09-23
Under the background of global climate change, the precipitation pattern in semi-arid areas in northern China will show the trend of increasing precipitation time fluctuation and extreme precipitation events, which will inevitably have a direct impact on the desert vegetation ecosystem. Artemisia ordosica is an important constructive species in semi-arid desert ecosystems. To study the response characteristics of its growth and biomass allocation under different rainfall patterns can provide a theoretical basis for exploring the adaptation mechanisms of desert plants in the context of global climate change. In this study, using artificial rain control methods, setting up a two-factor cross-experimental design of precipitation (increased by 30%, decreased by 30%, natural precipitation) and precipitation interval (5, 10, 15 d) to monitor the growth and development of A. ordosica response of growth and development morphological parameters and aboveground biomass and underground biomass distribution to the change of precipitation patterns. The results showed that: (1) the change of precipitation has a significant effect on plant height of A. ordosica (P<0.05), and a 30% reduction in precipitation can significantly reduce the plant height of A. ordosica. Under the condition of consistent precipitation intervals, a 30% increase in precipitation can significantly promote the increase of aboveground biomass. (2) the precipitation interval had a significant impact on the plant height and crown width of Artemisia ordosica (P<0.05), and the rain interval was extended from 5 d to 15 d. Plant height and crown width of A. ordosica were inhibited. When the total precipitation was fixed, the aboveground and underground biomass and total biomass of A. ordosica were significantly increased with the extension of precipitation interval (15 d). (3) precipitation and precipitation interval have interactive effects on the root-shoot ratio of A. ordosica, the effect of total precipitation on the root-shoot ratio depends on the length of precipitation interval. Changing the biomass allocation pattern is an important strategy for A. ordosica to adapt to changing of water resources environment. Under the trend of changing rainfall pattern in the future, the dual effects of precipitation and precipitation interval should be paid more attention to in the vegetation construction and management of desert ecosystems.
Key words: precipitation; precipitation interval; biomass; root/shoot ratio
Yingying He , Minghan Yu , Guodong Ding , Guanglei Gao , Wei Liu , Ziyuan Zhou . Responses of seedling growth and biomass allocation of Artemisia ordosica to precipitation and precipitation interval[J]. Journal of Desert Research, 2021 , 41(5) : 183 -191 . DOI: 10.7522/j.issn.1000-694X.2021.00061
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