Effects of single small rainfall events （≤5 mm） on the growth and reproduction of four typical desert annual herbaceous plants
Received date: 2020-11-30
Revised date: 2021-03-25
Online published: 2021-07-27
We selected four typically annual gramineous plant Setaria viridis， Chloris virgata， and chenopodiaceous plant Bassia dasyphylla， Salsola ruthenica as study subjects in a typical desert-oasis ecotone in the Hexi Corridor， and simulated the reduction of small rainfall events during jointing stage / leaf unfolding stage， flowering stage and fruit ripening stage， and analyzed the effects of a single small rainfall on the growth and reproduction of annual herbaceous plants. The results of the study showed that： （1） A single small rainfall reduction in the jointing stage / leaf unfolding stage led to significant changes in the root growth of four annual herbaceous plants， which were mainly manifested as the root length was reduced significantly， and the longitudinal growth was inhibited， but the underground biomass was significantly increased， and mainly due to lateral root growth. （2） A single small rainfall at different growth stages decreased， and the number of leaves and above-ground biomass of four annual herbaceous plants decreased but did not reach a significant level， only when small rainfall was reduced during the jointing stage / leaf unfolding stage， the plant height decreased significantly. （3） A single small rainfall at different growth stages decreased ，and the root-shoot ratio increased， but the value of the root-shoot ratio was still in the low range of 0.196-0.506， and the distribution of underground biomass was still far less than the above-ground biomass， which indicated that annual herb plants used more biomass for the growth of above-ground. （4） A single small rainfall reduction during the jointing stage/leaf unfolding stage led to the jointing stage/ leaf unfolding stage to be prolonged， and the flowering stage and fruit ripening stage were delayed， and the duration was shortened， and led to the reduction of annual herbaceous plants seed biomass ultimately.
Yijun Ren , Lulu Xi , Qianqian Gou , Bing Song , Guohua Wang . Effects of single small rainfall events （≤5 mm） on the growth and reproduction of four typical desert annual herbaceous plants[J]. Journal of Desert Research, 2021 , 41(4) : 87 -99 . DOI: 10.7522/j.issn.1000-694X.2021.00035
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