Chin J Plan Ecolo ›› 2017, Vol. 41 ›› Issue (3): 325-336.doi: 10.17521/cjpe.2016.0230

• Research Articles • Previous Articles     Next Articles

Effects of different nitrogen:phosphorus levels on the growth and ecological stoichiometry of Glycyrrhiza uralensis

Ju-Ying HUANG1,*(), Hai-Long YU2, Li-Li WANG2, Kai-Bo MA2, Yang-Mei KANG2, Ya-Xian DU2   

  1. 1Institute of Environmental Engineering, Ningxia University, Yinchuan 750021, China
    and
    2College of Resources and Environment, Ningxia University, Yinchuan 750021, China
  • Online:2017-04-12 Published:2017-03-10
  • Contact: Ju-Ying HUANG E-mail:juyinghuang@163.com
  • About author:

    KANG Jing-yao(1991-), E-mail: kangjingyao_nj@163.com

Abstract:

Aims The increase in atmospheric nitrogen (N) deposition has accelerated N cycling of ecosystems, probably resulting in increases in phosphorus (P) demand of ecosystems. Studies on the effects of artificial N:P treatment on the growth and carbon (C), N, P ecological stoichiometry of desert steppe species could provide not only a new insight into the forecasting of how the interaction between soils and plants responses to long-term atmospheric N deposition increase, but also a scientific guidance for sustainable management of grassland in northern China under global climate change. Methods Based on a pot-cultured experiment conducted for Glycyrrhiza uralensis (an N-fixing species) during 2013 to 2014, we studied the effects of different N:P supply ratios (all pots were treated with the same amount of N but with different amounts of P) on aboveground biomass, root biomass, root/shoot ratio, and C:N:P ecological stoichiometry both in G. uralensis (leaves and roots) and in soils. Additionally, through the correlation analyses between biomass and C:N:P ecological stoichiometry in leaves, roots, and soils, we compared the differences among the C:N:P ecological stoichiometry of the three pools, and discussed the indication of C:N:P ecological stoichiometry in soils for the growth and nutrient uptake of G. uralensis. Important findings The results showed that, reducing N:P decreased C:P and N:P ratios both in G. uralensis (leaves and roots) and in soils but increased aboveground biomass and root biomass of G. uralensis, indicating that low to moderate P addition increased P availability of soils and P uptake of G. uralensis. However, excessive low N:P (high P addition) led to great decreases in soil C:P and N:P ratios, thus hindering N uptake and the growth of G. uralensis. C:N:P ratios in the two pools of G. uralensis (especially in leaves) had close correlations with soil C:N:P ratio, indicating that the change in soil C:N:P ratio would have a direct influence on plants. Our results suggest that, through regulating C:N:P ratio in leaves and soils, appropriate amounts of P addition could balance soil P supply and plant P demand and compensate the opposite influences of long-term atmospheric N deposition increase on the structure of desert steppe.

Key words: ecological stoichiometry, desert steppe, Glycyrrhiza uralensis, phosphorus addition

Table 1

Basic soil properties before Glycyrrhiza uralensis transplanting"

土壤有机碳
Soil organic carbon (g·kg-1)
土壤全氮 Soil total
nitrogen (g·kg-1)
土壤全磷
Soil total phosphorus (g·kg-1)
NH4+-N
(mg·kg-1)
NO3--N
(mg·kg-1)
土壤速效磷
Soil available phosphorus (mg·kg-1)
1.8 0.2 0.3 1.2 8.3 13.8

Fig. 1

Effects of nitrogen (N):phosphorus (P) level on root and aboveground biomass and root/shoot ratio of Glycyrrhiza uralensis (mean ± SE, n = 5). N10P1, N10P2, N10P4, N10P8, N10P16, and N10P32 represent all pots treated with 10.0 g·m-2·a-1 amount of N but with different amounts of P: 1.0, 2.0, 4.0, 8.0, 16.0, and 32.0 g·m-2·a-1, respectively. Different lowercase letters indicate significant difference (p < 0.05) between indices within N:P levels. The same lowercase letters indicate insignificant differences (p > 0.05)."

Fig. 2

Effects of nitrogen (N):phosphorus (P) level on leaf carbon (C), N, P and their stoichiometry ratios of Glycyrrhiza uralensis (mean ± SE, n = 5). N10P1, N10P2, N10P4, N10P8, N10P16, and N10P32 represent all pots treated with 10.0 g·m-2·a-1 amount of N but with different amounts of P: 1.0, 2.0, 4.0, 8.0, 16.0, and 32.0 g·m-2·a-1, respectively. Different lowercase letters indicate significant difference (p < 0.05) between indices within N:P levels. The same lowercase letters indicate insignificant difference (p > 0.05)."

Fig. 3

Effects of nitrogen (N): phosphorus (P) level on root carbon (C), N, P and their stoichiometry ratios of Glycyrrhiza uralensis (mean ± SE, n = 5). N10P1, N10P2, N10P4, N10P8, N10P16, and N10P32 represent all pots were treated with 10.0 g·m-2·a-1 amount of N but with differing amounts of P: 1.0, 2.0, 4.0, 8.0, 16.0, and 32.0 g·m-2·a-1, respectively. Different lowercase letters indicate significant differences (p < 0.05) between indices within N:P levels. The same lowercase letters indicate insignificant differences (p > 0.05)."

Fig. 4

Effects of nitrogen (N):phosphorus (P) level on soil carbon (C), N, and P content (mean ± SE, n = 5). N10P1, N10P2, N10P4, N10P8, N10P16, and N10P32 represent all pots treated with 10.0 g·m-2·a-1 amount of N but with different amounts of P: 1.0, 2.0, 4.0, 8.0, 16.0, and 32.0 g·m-2·a-1, respectively. Different lowercase letters indicate significant difference (p < 0.05) between indices within N:P levels. The same lowercase letters indicate insignificant difference (p > 0.05)."

Table 2

Correlation coefficients between carbon (C), nitrogen (N), phosphorus (P ) and their stoichiometry ratios in Glycyrrhiza uralensis and in soils"

指标
Index
土壤有机C
Soil organic C (g·kg-1)
土壤全N
Soil total N
(g·kg-1)
土壤全P
Soil total P
(g·kg-1)
土壤速效P
Soil available P
(mg·kg-1)
土壤C:N Csoil:Nsoil 土壤C:P
Csoil:Psoil
土壤N:P Nsoil:Psoil
地上生物量 Aboveground biomass (g·plant-1) ns ns ns 0.51* ns ns 0.05
地下生物量 Belowground biomass (g·plant-1) ns ns ns ns 0.50* ns ns
叶片全C Leaf total C (mg·g-1) ns ns ns ns ns ns ns
叶片全N Leaf total N (mg·g-1) ns -0.56* ns ns 0.69** 0.50* ns
叶片全P Leaf total P (mg·g-1) ns ns 0.77** ns ns -0.70** -0.75**
叶片C:N Cleaf:Nleaf ns ns ns ns -0.56* ns ns
叶片C:P Cleaf:Pleaf ns ns -0.63** ns ns 0.58* 0.64**
叶片N:P Nleaf:Pleaf ns ns -0.80** -0.49* 0.57* 0.85** 0.79**
根系全C Root total C (mg·g-1) ns ns ns 0.62** ns ns -0.53*
根系全N Root total N (mg·g-1) ns ns -0.50* ns ns ns ns
根系全P Root total P (mg·g-1) ns ns ns ns ns ns ns
根系C:N Croot:Nroot ns ns 0.66** ns ns -0.58* -0.70**
根系C:P Croot:Proot ns ns ns ns ns ns ns
根系N:P Nroot:Proot ns ns -0.57* ns ns 0.65** 0.67**

Table 3

Correlation coefficients between carbon (C):nitrogen (N):phosphorus (P) ecological stoichiometry and the biomass or root/shoot ratio of Glycyrrhiza uralensis"

指标
Index
地上生物量
Aboveground biomass
(g·plant-1)
地下生物量
Belowground biomass (g·plant-1)
总生物量
Total biomass
(g·plant-1)
根冠比
Root/shoot ratio
土壤有机C Soil organic C (g·kg-1) 0.18 0.35 0.32 -0.37
土壤全N Soil total N (g·kg-1) -0.01 -0.33 -0.23 -0.21
土壤全P Soil total P (g·kg-1) -0.27 -0.39 -0.39 0.01
土壤速效P Soil available P (mg·kg-1) 0.51* 0.18 0.35 -0.05
土壤C:N Csoil:Nsoil 0.12 0.50* 0.40 0.04
土壤C:P Csoil:Psoil -0.00 0.19 0.13 0.18
土壤N:P Nsoil:Psoil 0.05 0.07 0.07 0.13
叶片全C Leaf total C (mg·g-1) 0.07 -0.08 -0.03 -0.33
叶片全N Leaf total N (mg·g-1) 0.25 0.35 0.35 -0.27
叶片全P Leaf total P (mg·g-1) -0.07 -0.31 -0.25 -0.25
叶片C:N Cleaf:Nleaf -0.18 -0.21 -0.22 0.27
叶片C:P Cleaf:Pleaf 0.02 0.22 0.16 0.41
叶片N:P Nleaf:Pleaf 0.07 0.29 0.23 0.15
根系全C Root total C (mg·g-1) 0.39 0.39 0.44 -0.68
根系全N Root total N (mg·g-1) 0.49* 0.21 0.36 -0.58
根系全P Root total P (mg·g-1) 0.43 0.19 0.32 -0.55
根系C:N Croot:Nroot -0.22 -0.03 -0.12 0.10
根系C:P Croot:Proot -0.29 -0.05 -0.17 0.39
根系N:P Nroot:Proot -0.07 -0.04 -0.06 0.18

Fig. 5

Effects of nitrogen (N): phosphorus (P) level on soil carbon (C) :N:P stoichiometry ratio (mean ± SE, n = 5). N10P1, N10P2, N10P4, N10P8, N10P16, and N10P32 represent all pots treated with 10.0 g·m-2·a-1 amount of N but with different amounts of P: 1.0, 2.0, 4.0, 8.0, 16.0, and 32.0 g·m-2·a-1, respectively. Different lowercase letters indicate significant difference (p < 0.05) between indices within N:P levels. The same lowercase letters indicate insignificant difference (p > 0.05)."

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