Effect of mixed sowing on component allocation and phenotypic traits of Agropyron mongolicum

doi:10.16178/j.issn.0528-9017.20240180

Abstract

Abstract:

Mixed sowing of leguminous and gramineous forage plays an important role in improving forage quality and grassland productivity. A pot experiment was conducted to study the changes of individual biomass, component allocation, leaf traits and root traits of A. mongolicum based on the mixed sowing ratios of Agropyron mongolicum and Lespedeza potaninii with 12∶0 (M12N0), 8∶4 (M8N4) and 4∶8 (M4N8). The total individual biomass, root biomass, and root-shoot ratio of A. mongolicum were all higher under M8N4 treatment. The leaf biomass decreased with the decrease of the proportion of A. mongolicum in mixed sowing, and the highest was in the M12N0 treatment, with 0.50 g per plant, which was significantly higher than those under M8N4 and M4N8 treatments (P<0.05). The leaf length and area of A. mongolicum were the highest under M12N0 treatment and the lowest under M8N4 treatment. The specific leaf area, dry matter content and leaf thickness under M8N4 treatment were higher. The average root diameter of A. mongolicum was the highest under M12N0 treatment. The root length, specific root length, root surface area and root bifurcation number were the highest under M4N8 treatment, which were significantly higher than those under M12N0 and M8N4 treatments. The root volume and number of root tips under M8N4 treatment were high. With the increase of the proportion of A.mongolicum in mixed sowing the root length and specific root length of A. mongolicum decreased.Under different mixed sowing modes, the competitiveness of A.mongolicum can be enhanced by adjusting the component resource allocation and the plasticity of leaf traits and root traits, so as to ensure its growth and development. This study provides theoretical guidance for the restoration of degraded grasslands.

Key words: mixed sowing of leguminous and gramineous forage, mixed sowing ratio, component allocation, leaf traits, root structure

CLC Number:

S543

MA Yuan, XU Dongmei, LI Yongkang, SA Chunning, CHANG Yiran, KANG Rulong. Effect of mixed sowing on component allocation and phenotypic traits of Agropyron mongolicum[J]. Journal of Zhejiang Agricultural Sciences, 2025, 66(6): 1404-1411.

Figures/Tables 8

Table 1 Individual total biomass and each component biomass of A. mongolicum under different mixed sowing treatments 单位:g

处理	个体总生物量	地上生物量	根生物量	茎生物量	叶生物量
M12N0	1.70±0.10 A	0.78±0.02 A	0.92±0.10 A a	0.28±0.02 A b	0.50±0.02 A b
M8N4	1.87±0.16 A	0.63±0.13 AB	1.23±0.13 A a	0.28±0.02 A b	0.36±0.05 B b
M4N8	1.40±0.12 A	0.58±0.06 B	0.82±0.10 A a	0.24±0.03 A b	0.34±0.03 B b

Fig.1 Biomass allocation ratio of each compenent and root-shoot ratio of A.mongolicum under different mixed sowing treatments

Fig.2 Changes of leaf length, leaf width and leaf thickness of A.mongolicum under different mixed sowing treatments

Fig.3 Changes of dry matter content in leaf, leaf area and specific leaf area of A. mongolicum under different mixed sowing treatments

Fig.4 Changes of root length, specific root length and average root diameter of A. mongolicum under different mixed sowing treatments

Fig.5 Changes of root surface area and root volume of A. mongolicum under different mixed sowing treatments

Fig.6 Changes of root tip number and root bifurcation number of A. mongolicum under different mixed sowing treatments

Fig.7 The correlation among component biomass, leaf traits and root structure of A. mongolicum

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