4.5 Article

Comprehensive evaluation of the allelopathic potential of Elymus nutans

Journal

ECOLOGY AND EVOLUTION
Volume 11, Issue 18, Pages 12389-12400

Publisher

WILEY
DOI: 10.1002/ece3.7982

Keywords

allelopathy; alpine meadow; autotoxicity; gramineae; grassland degradation; mixed sowing

Funding

  1. National Natural Science Foundation of China [31760691]
  2. Youth Foundation of Qinghai University [2020-QNY-2]
  3. Programme of Introducing Talents of Discipline to Universities [D18013]
  4. National Key R&D Program of China [2017YFC0504803]

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The study found that Elymus nutans has strong allelopathic potential, with varying effects on different plants. It is recommended to consider a combination of mixed plant species during restoration to mitigate its allelopathic effects.
Elymus nutans has been widely planted together with other perennial grasses for rebuilding degraded alpine meadow atop the Qinghai-Tibetan Plateau. However, the rebuilt sown pastures begin to decline a few years after establishing. One of the possible causes for the degradation of sown grassland may come from allelopathy of planted grasses. The purpose of this study was to examine allelopathic potential of Elymus nutans. Three types of aqueous extract from Elymus nutans and its root zone soil were prepared, and 5 highland crops and 5 perennial grasses were used as recipient plants. Elymus nutans exhibited strong allelopathic potential on germination and seedling growth of 5 crops, but different crops or perennial grasses respond to the extract differently. The pieces aqueous extract have stronger inhibition than whole plant extract and root zone soil extract. Hordeum vulgar var. nudum, Avena sativa, and Festuca sinensis were the most affected, while Chenopodium quinoa and Elymus sibiricus were the least affected. Elymus nutans presented less influence on Poa pratensis and Poa crymophylla than on Festuca sinensis. It is recommended that the species combination of mixture for restoration should be considered for allopathic effects on the coseeding to decrease the seeding rate ratio of Elymus nutans. The annual dicot crop seeds of Chenopodium quinoa and Brassica napus can be used as alternative subsequent crop for the seed field of Elymus nutans monoculture.

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