Life History Strategies of the Winter Annual Plant <i>Echinops gmelinii</i> (Asteraceae) in a Cold Desert Population

<i>Echinops gmelinii</i> Turcz. is a winter annual species of the Asteraceae family, distributed in sandy areas of northern China, and is crucial for wind avoidance and sand fixation. To understand the inter- and intra-annual population dynamics of <i>E. gmelinii</i> in its c...

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Main Authors: Yanli Wang, Xinrong Li, Jiecai Zhao
Format: Article
Language:English
Published: MDPI AG 2025-01-01
Series:Plants
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Online Access:https://www.mdpi.com/2223-7747/14/2/284
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author Yanli Wang
Xinrong Li
Jiecai Zhao
author_facet Yanli Wang
Xinrong Li
Jiecai Zhao
author_sort Yanli Wang
collection DOAJ
description <i>Echinops gmelinii</i> Turcz. is a winter annual species of the Asteraceae family, distributed in sandy areas of northern China, and is crucial for wind avoidance and sand fixation. To understand the inter- and intra-annual population dynamics of <i>E. gmelinii</i> in its cold desert habitats, we conducted long- and short-term demographic studies to investigate the timing of germination, seedling survival, soil seed bank and seed longevity of natural populations on the fringe of the Tengger Desert. Cypselae (seeds) of <i>E. gmelinii</i> can germinate in both July and August, but this process is heavily affected by precipitation amount and timing. Early emerging seedlings died rapidly under the high temperature and drought stress, before completing their life cycle. Later emerging seedlings could survive to complete their life cycle due to more suitable conditions for plant growth. In short, seedling survival dynamics were affected by precipitation distribution, and the survival rates were low (<4%). In addition, we found that the high seed production (1328 seeds·m<sup>−2</sup>) of <i>E. gmelinii</i> depended mainly on the production of seeds by individuals rather than high plant density (35 individuals·m<sup>−2</sup>). The contribution of newly ripened seeds and soil seed banks to seedlings emergence was 57.7% and 42.3%, respectively. Thus, only a small amount of the newly matured seeds was depleted during the year. Only 23.6% of the annual seeds germinated, and the remainder accumulated in a persistent soil seed bank (seed longevity was ≥2 y). The amount and timing of precipitation distribution were the key factors affecting the population dynamics of <i>E. gmelinii</i> in our study area. This species can cope with the uncertain precipitation patterns though a “cautious” germination strategy, varying the timing of germination and forming a persistent soil seed bank.
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spelling doaj-art-2b9c009dc6a24459b5649828f33aedd72025-01-24T13:47:06ZengMDPI AGPlants2223-77472025-01-0114228410.3390/plants14020284Life History Strategies of the Winter Annual Plant <i>Echinops gmelinii</i> (Asteraceae) in a Cold Desert PopulationYanli Wang0Xinrong Li1Jiecai Zhao2College of Forestry, Gansu Agricultural University, No. 1 Yingmen Village, Anning District, Lanzhou 730070, ChinaShapotou Desert Research and Experimental Station, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, 320 Donggang West Road, Lanzhou 730000, ChinaShapotou Desert Research and Experimental Station, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, 320 Donggang West Road, Lanzhou 730000, China<i>Echinops gmelinii</i> Turcz. is a winter annual species of the Asteraceae family, distributed in sandy areas of northern China, and is crucial for wind avoidance and sand fixation. To understand the inter- and intra-annual population dynamics of <i>E. gmelinii</i> in its cold desert habitats, we conducted long- and short-term demographic studies to investigate the timing of germination, seedling survival, soil seed bank and seed longevity of natural populations on the fringe of the Tengger Desert. Cypselae (seeds) of <i>E. gmelinii</i> can germinate in both July and August, but this process is heavily affected by precipitation amount and timing. Early emerging seedlings died rapidly under the high temperature and drought stress, before completing their life cycle. Later emerging seedlings could survive to complete their life cycle due to more suitable conditions for plant growth. In short, seedling survival dynamics were affected by precipitation distribution, and the survival rates were low (<4%). In addition, we found that the high seed production (1328 seeds·m<sup>−2</sup>) of <i>E. gmelinii</i> depended mainly on the production of seeds by individuals rather than high plant density (35 individuals·m<sup>−2</sup>). The contribution of newly ripened seeds and soil seed banks to seedlings emergence was 57.7% and 42.3%, respectively. Thus, only a small amount of the newly matured seeds was depleted during the year. Only 23.6% of the annual seeds germinated, and the remainder accumulated in a persistent soil seed bank (seed longevity was ≥2 y). The amount and timing of precipitation distribution were the key factors affecting the population dynamics of <i>E. gmelinii</i> in our study area. This species can cope with the uncertain precipitation patterns though a “cautious” germination strategy, varying the timing of germination and forming a persistent soil seed bank.https://www.mdpi.com/2223-7747/14/2/284population dynamicswinter annualseed germinationseedlings survivalsoil seed banktemperate desert
spellingShingle Yanli Wang
Xinrong Li
Jiecai Zhao
Life History Strategies of the Winter Annual Plant <i>Echinops gmelinii</i> (Asteraceae) in a Cold Desert Population
Plants
population dynamics
winter annual
seed germination
seedlings survival
soil seed bank
temperate desert
title Life History Strategies of the Winter Annual Plant <i>Echinops gmelinii</i> (Asteraceae) in a Cold Desert Population
title_full Life History Strategies of the Winter Annual Plant <i>Echinops gmelinii</i> (Asteraceae) in a Cold Desert Population
title_fullStr Life History Strategies of the Winter Annual Plant <i>Echinops gmelinii</i> (Asteraceae) in a Cold Desert Population
title_full_unstemmed Life History Strategies of the Winter Annual Plant <i>Echinops gmelinii</i> (Asteraceae) in a Cold Desert Population
title_short Life History Strategies of the Winter Annual Plant <i>Echinops gmelinii</i> (Asteraceae) in a Cold Desert Population
title_sort life history strategies of the winter annual plant i echinops gmelinii i asteraceae in a cold desert population
topic population dynamics
winter annual
seed germination
seedlings survival
soil seed bank
temperate desert
url https://www.mdpi.com/2223-7747/14/2/284
work_keys_str_mv AT yanliwang lifehistorystrategiesofthewinterannualplantiechinopsgmeliniiiasteraceaeinacolddesertpopulation
AT xinrongli lifehistorystrategiesofthewinterannualplantiechinopsgmeliniiiasteraceaeinacolddesertpopulation
AT jiecaizhao lifehistorystrategiesofthewinterannualplantiechinopsgmeliniiiasteraceaeinacolddesertpopulation