Effect of plantation age on plant and soil C:N:P stoichiometry in Kentucky bluegrass pastures

被引:0
作者
Wei, Xiaoxing [1 ,2 ]
He, Keyan [1 ]
Wang, Qian [2 ]
Liu, Wenhui [2 ]
Pang, Xiaopan [1 ]
Guo, Zhenggang [1 ]
机构
[1] Lanzhou Univ, Coll Pastoral Agr Sci & Technol, Engn Res Ctr Grassland Ind, Minist Educ, Lanzhou, Peoples R China
[2] Qinghai Univ, Xining, Peoples R China
关键词
Kentucky bluegrass; ecologic stoichiometry; plantation age; leaf; stem; root; soil; BIOMASS ALLOCATION; NITROGEN; TRAITS; CARBON; PHOSPHORUS; LITTER; GROWTH; LEAVES; INPUTS; STEMS;
D O I
10.3389/fsufs.2024.1368418
中图分类号
TS2 [食品工业];
学科分类号
0832 ;
摘要
Plant and soil C:N:P stoichiometry reflects the element content and energy flow, which are important for biogeochemical cycling in ecosystems. Although plantation age has been verified to affect leaf C:N:P stoichiometry in alfalfa plants, its effect on plant and soil C:N:P stoichiometry in grass remains poorly documented. A 10-year field experiment of Kentucky bluegrass (Poa pratensis) was used to test how plantation age affect plant and soil C:N:P stoichiometry in a perennial rhizomatous grass pasture. This study demonstrated that leaf C:N, C:P, and N:P ratios exhibited a rapid increasing trend from 2 to 6 years of age, whereas leaf C:N showed a slight decreasing trend, and leaf C:P and N:P maintained stability from 6 to 9 years of age. Stem C:N and N:P were not different among plantation ages, while stem C:P increased from 2 to 4 years of plantation age and then maintained stability from 4 to 9 years of plantation age. Root N:P showed an increasing trend from 2 to 6 years of plantation age and relative stability from 6 to 9 years of plantation age, whereas root C:N and C:P showed decreasing trends from 2 to 9 years of plantation age. Although soil C:P did not differ among nine plantation ages, soil C:N and N:P remained relatively stable from 2 to 6 years of plantation age. However, soil C:N showed a decreasing trend, while soil N:P showed an increasing trend after 6 years of plantation age. The results from an ecological stoichiometric homeostasis analysis further showed that N in the leaf, stem, and root and P in the stem had strict homeostasis, whereas P in the leaf and root showed plastic and weakly homeostatic status, respectively. These results present a pattern concerning the plantation age in relation to plant and soil C:N:P stoichiometry in a perennial grass and provide useful information for N and P management in Kentucky bluegrass pastures.
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页数:10
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