Scientia Agricultura Sinica ›› 2022, Vol. 55 ›› Issue (11): 2257-2264.doi: 10.3864/j.issn.0578-1752.2022.11.014

• ANIMAL SCIENCE·VETERINARY SCIENCE·RESOURCE INSECT • Previous Articles    

The Response of Leymus chinensis Cloned Offspring to Mowing

GUO FengHui1,2(),DING Yong2,JI Lei2,LI XianSong2,LI XiLiang2(),HOU XiangYang1,2()   

  1. 1Shanxi Agricultural University, Taiyuan 030012
    2Institute of Grassland Research, Chinese Academy of Agricultural Sciences, Hohhot 010010
  • Received:2020-07-22 Accepted:2022-04-15 Online:2022-06-01 Published:2022-06-16
  • Contact: XiLiang LI,XiangYang HOU E-mail:guofhui@163.com;lixiliang0824@126.com;houxy16@vip.126.com

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Abstract:

【Background】 Grazing could alter the morphological and photosynthetic physiological characters of the Leymus chinensis cloned offspring, but whether grazing influence the adaptability of that to grazing is unclear. 【Objective】 The aim of this study was to investigate whether grazing history enhanced the adaptability of Leymus chinensis cloned offspring to livestock grazing.【Method】 The Leymus chinensis cloned offspring with different grazing histories (enclosed in 1983 VS long-term free grazing) were used to conduct pot experiment in the greenhouse, and their adaptability to simulated livestock grazing (clipping) was compared in terms of individual traits, ramet number, biomass, and biomass allocation. 【Result】 (1) There was a significant interact effect between maternal grazing history and clipping treatment. The individual height and biomass of grazing (GZ) were more resistant to clipping treatment than that of nograzing (NG), while the response of ramet number to clip was not influenced by maternal grazing history. (2) Grazing history altered the responses of aboveground, root, rhizome and total biomass to the clipping treatment. There was significant interaction between grazing history and mowing treatment in terms of the rhizome biomass, while the interaction on other three indicators were not significant. However, the other three indicators of NG had the larger plasticity index and absolute reduction to clipping treatment. Therefore, the maternal grazing experience enhanced the adaptability of L. chinensis cloned offspring to clipping treatment. (3) The cutting biomass of NG was significantly lower than that of GZ, but the cutting degree of NG was significantly higher than that of GZ.(4) The responses of GZ biomass allocation to clipping treatment were not significant, while rhizome biomass allocation of NG significantly decreased under clipping treatment. 【Conclusion】 The grazing disturbance could enhance the adaption of Leymus chinensis cloned offspring to grazing. The maternal grazing history did not enhance the adaptability of L. chinensis cloned offspring to livestock grazing by altering biomass allocation. The response of leaf photosynthetic physiology and grazing avoidance might be the reasons for the enhancement of grazing fitness. In this study, the environmental disturbance factors, such as soil factors, were excluded through control experiments, and the response of L. chinensis cloned offspring traits to grazing was studied from the perspective of the plant itself. Thus, this study provided a new perspective for fully understanding the process of grazing degradation in grassland ecosystem.

Key words: grazing history, Leymus chinensis, cloned offspring, livestock foraging, adaptation

Fig. 1

The responses of GZ and NG to clipping in terms of individual characters and ramet number CK indicates control treatment while CT indicates clipping treatment. “P” is the result of Two-Way ANOVA, and P<0.05 indicates the significant interaction while P<0.01 indicates the extremely significant interaction. “NO” means that Two-Way ANOVA is not conducted. “The red line (一)” represents the response of GZ (Leymus chinensis derived from grazing area) to clipping treatment, and the red words “PI, ∆” besides the red line indicate the plastic index and variation of GZ to clipping, respectively, and the red symbol “*” ahead “PI, ∆” indicates the significant effect of clipping treatment. “The black line (一)” represents the response of NG (Leymus chinensis derived from enclosing area) to clipping treatment, and the black words “PI, ∆” respectively indicate the plasticity index and variation of NG to clipping treatment. and the black symbol “*” ahead “PI, ∆” indicates the significant effect of clipping treatment. “*” between the red and black error lines indicates that there is a significant difference between NG and GZ under control or clipping treatment. The same as below"

Fig. 2

The responses of GZ and NG to clipping treatment in terms of biomass accumulation “ns” indicates that there is no significant effect between NG and GZ, or CK and CT"

Fig. 3

The removed biomass and clipping degree of GZ and NG under the clipping treatment The red bars indicate NG while the green bars indicate GZ"

Fig. 4

The responses of GZ and NG to clipping treatment in terms of biomass allocation"

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