Effects of simulated warming on growth characteristics of Bromus inermis

doi:10.11686/cyxb2022410

Abstract

Abstract:

The growth characteristics exhibited by wild forage grasses at different growth stages in the context of increasing global temperatures and the increased frequency of extreme weather occurrences are important elements in exploring the response patterns of forage grasses to warming. In this study， three temperature-increasing treatments （CK， W₁， W₂） were applied to three growth stages （germination， seedling and reproduction） by field simulation device （open-top chambers， OTC） to determine germination index， seedling growth index， trait index and biomass， respectively， using Bromus inermis in Xinjiang. The results showed that W₂ temperature increase significantly increased emergence energy and emergence rate by 1.38 and 1.49 times compared to CK， respectively （P<0.05）； W₁ and W₂ temperature increase inhibited seedling leaf length and root length by 9.9% and 43.3%， respectively， with the inhibitory effect of W₁ temperature increase on leaf length and root length being more obvious. W₁ temperature increase inhibited reproductive growth and enhanced inputs to nutritional organs in B. inermis， while reproductive growth was more dominant under W₂ temperature increase. The above- and below-ground biomass growth patterns gradually changed from anisotropic to isotropic during the seedling stage； the isotropic growth pattern was maintained throughout the reproductive stage. In summary， the three growth stages of B. inermis responded differently to the temperature increase， and seedling emergence and reproductive growth were promoted， but seedling growth was suppressed； and from the time of rooting， B. inermis prefers to accumulate the energy of the underground part， which is used to ensure its survival and sexual reproduction in a warmed environment. The results of the study can be used as a reference for understanding the adaptability of B. inermis in different growth stages in response to temperature increase.

Key words: meadow steppe, warming, Bromus inermis, vegetative growth, reproductive growth

Ke GONG, Gui-li JIN, Wen-hao LIU, Jian MA, Zhi-biao LIU, Jia-xin LI, Ying LI. Effects of simulated warming on growth characteristics of Bromus inermis[J]. Acta Prataculturae Sinica, 2023, 32(9): 93-103.

Figures/Tables 8

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处理 Treatment	生殖生长Reproductive growth			营养生长Vegetative growth
处理 Treatment	生殖投入 Reproductive investment （%）	生殖生长比率 Reproductive growth ratio （%）	千粒重 Thousand seed weight （g）	根冠比 Radicle biomass/seedling biomass	营养投入 Nutrient investment （%）	株高 Plant height （cm）
CK	5.39±0.48a	26.63±3.06b	0.378±0.013a	1.20±0.12ab	94.61±0.49a	69.60±3.49ab
W₁	5.44±0.61a	15.12±0.71a	0.371±0.064a	0.70±0.09a	94.56±0.61a	75.80±4.44b
W₂	7.65±1.17a	27.53±2.57b	0.455±0.023a	1.25±0.22b	92.34±1.17a	65.59±3.42a

处理 Treatment	生殖生长Reproductive growth			营养生长Vegetative growth
处理 Treatment	生殖投入 Reproductive investment （%）	生殖生长比率 Reproductive growth ratio （%）	千粒重 Thousand seed weight （g）	根冠比 Radicle biomass/seedling biomass	营养投入 Nutrient investment （%）	株高 Plant height （cm）
CK	5.39±0.48a	26.63±3.06b	0.378±0.013a	1.20±0.12ab	94.61±0.49a	69.60±3.49ab
W₁	5.44±0.61a	15.12±0.71a	0.371±0.064a	0.70±0.09a	94.56±0.61a	75.80±4.44b
W₂	7.65±1.17a	27.53±2.57b	0.455±0.023a	1.25±0.22b	92.34±1.17a	65.59±3.42a

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