中国の半乾燥砂丘地域におけるリッターは初期の継代植物に強い負のアレロパシー効果を持つ

Litters Have Strong Negative Allelopathic Effects on Earlier Successional Plants in a Semi-Arid Sandy Dune Region in China.

• Yongqing Luo
• Zhong Du
• Zhiqiang Yan
• Xueyong Zhao
• Yuqiang Li
• Haibo Jiang
• Yue Yang
• Mai-He Li

抄録

中国の砂丘地域における自然植生の継代において、前者が後者に取って代わり、先駆種である(L.)Moq.が出現した後に発生したTurcz. ex Besser。しかし、このアリルロパシー効果がリターの種類や植物種によって異なるかどうかについては、まだ研究されていない。そこで我々は，中国東北部ホルチン砂地の半乾燥草地で継代勾配に沿って進行する6種の植物の種子発芽に対する3種類のリター（根，葉，茎）のアリロパシー効果を調べるための種子発芽実験を行った。その結果、リター抽出物の濃度が高いほど、リターの種類にかかわらず、種子の発芽に対す るアレロパシー効果は増加することがわかった。本研究では、ホルチン砂地における砂丘安定化の際に、種の入れ替えや群集構成に負のアレロパシー効果があることを明らかにした。さらなる研究が必要であり、その結果、砂丘地域の植生回復を促進するためには、砂丘の安定化過程をよりよく理解することが必要である。

Turcz. ex Besser occurs following the appearance of a pioneer species, (L.) Moq., with the former replacing the latter during the naturally vegetation succession in sandy dune regions in China. A previous study revealed that the foliage litter of had strong negative allelopathic effects on germination of the soil seed bank and on the seedling growth. However, whether this allelopathic effect varies with litter types and with the identity of plant species has not yet been studied. We, therefore, carried out a seed germination experiment to determine the allelopathic effects of three ltter types of (roots, foliage, and stems) on seed germination of six plant species that progressively occur along a successional gradient in the semi-arid grasslands in the Horqin Sandy Land of northeastern China. In line with our expectation, we found that the early-successional species rather than the late-successional species were negatively affected by and that the allelopathic effects on seed germination increase with increasing concentration of litter extracts, irrespective of litter types. Our study evidenced the negative allelopathic effects of on the species replacement and on the community composition during dune stabilization in the Horqin Sandy Land. Further studies are needed to better understand the successional process and thus to promote the vegetation restoration in that sandy dune region as itself disappeared also during the process.

Copyright © 2020 Luo, Du, Yan, Zhao, Li, Jiang, Yang and Li.