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Journal of Arid Land
Journal of Arid Land  2022, Vol. 14 Issue (10): 1124-1137    DOI: 10.1007/s40333-022-0033-9     CSTR: 32276.14.s40333-022-0033-9
Research article     
Leaf stoichiometry of Leontopodium lentopodioides at high altitudes on the northeastern Qinghai-Tibetan Plateau, China
WANG Hairu1, SU Haohai1, Asim BISWAS2, CAO Jianjun1,3,4,*()
1College of Geography and Environmental Science, Northwest Normal University, Lanzhou 730070, China
2School of Environmental Sciences, University of Guelph, 50 Stone Road East, Guelph, Ontario N1G 2W1, Canada
3Key Laboratory of Eco-Functional Polymer Materials of the Ministry of Education, Northwest Normal University, Lanzhou 730070, China
4Key Laboratory of Resource Environment and Sustainable Development of Oasis, College of Geography and Environmental Science, Northwest Normal University, Lanzhou 730070, China
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Abstract  

Altitude affects leaf stoichiometry by regulating temperature and precipitation, and influencing soil properties in mountain ecosystems. Leaf carbon concentration (C), leaf nitrogen concentration (N), leaf phosphorous concentration (P), and their stoichiometric ratios of Leontopodium lentopodioides (Willd.) Beauv., a widespread species in degraded grasslands, were investigated to explore its response and adaptation strategy to environmental changes along four altitude gradients (2500, 3000, 3500, and 3800 m a.s.l.) on the northeastern Qinghai-Tibetan Plateau (QTP), China. The leaf C significantly varied but without any clear trend with increasing altitude. Leaf N showed an increasing trend, and leaf P showed a little change with increasing altitude, with a lower value of leaf P at 3500 m than those at other altitudes. Similarity, leaf C:P and N:P exhibited a little change with increasing altitude, which both had greater values at 3500 m than those at other altitudes. However, leaf C:N exhibited a decreasing trend with increasing altitude. Soil NH+ 4-N, soil pH, soil total phosphorus (STP), mean annual temperature (MAT), and mean annual precipitation (MAP) were identified as the main factors driving the variations in leaf stoichiometry of L. lentopodioides across all altitudes, with NH+ 4-N alone accounting for 50.8% of its total variation. Specifically, leaf C and N were mainly controlled by MAT, soil pH, and NH+ 4-N, while leaf P by MAP and STP. In the study area, it seems that the growth of L. lentopodioides may be mainly limited by STP. The results could help to strengthen our understanding of the plasticity of plant growth to environmental changes and provide new information on global grassland management and restoration.

Key words： alpine area      environmental changes      leaf elements      nutrient limitation      Qilian Mountains     
Received: 08 May 2022      Published: 31 October 2022
Corresponding Authors: *CAO Jianjun (E-mail: caojj@nwnu.edu.cn)
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WANG Hairu
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WANG Hairu, SU Haohai, Asim BISWAS, CAO Jianjun. Leaf stoichiometry of Leontopodium lentopodioides at high altitudes on the northeastern Qinghai-Tibetan Plateau, China. Journal of Arid Land, 2022, 14(10): 1124-1137.

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http://jal.xjegi.com/10.1007/s40333-022-0033-9     OR     http://jal.xjegi.com/Y2022/V14/I10/1124

Fig. 1 Four sampled altitudes (2500, 3000, 3500, and 3800 m) in the study area
Altitude (m) Geographic
coordinate		 MAT
(℃)		 MAP
(mm)		 Vegetation
type		 Soil type Major species
2500 38°37'05”N 100°21'55”E 1.71 316.60 Mountain forest steppe Mountain gray cinnamon soil Potentilla bifurca Linn., Oxytropis ochrocephala, Stellera chamaejasme, and Leontopodium leontopodioides (Wild.) Beauv.
3000 38°33'22”N 100°14'26”E -1.02 379.22 Mountain forest steppe Mountain gray cinnamon soil Stipa przewalskyi Roshev., Stellera chamaejasme, Oxytropis ochrocephala, Sabina przewalskii Kom., Heteropappus hispidus (Thunb.) Less., and Leontopodium leontopodioides
3500 37°40'48”N 101°21'00”E -3.61 518.42 Alpine meadow Alpine
meadow soil		 Potentilla anserine L., Potentilla fruticose L., Kobresia humilis (C. A. Mey ex Trauvt.) Sergievskaya., Poa crymophila Keng, Carex crebra V. Krecz., and Leontopodium leontopodioides
3800 37°41'24”N 101°22'12”E -5.26 553.62 Alpine meadow Alpine meadow soil Potentilla fruticosa, Potentilla anserine, Kobresia humilis, Kobresia pygmaea C. B. Clarke, and Leontopodium leontopodioides
Table 1 Basic characteristics of sample site in the northeastern Qinghai-Tibetan Plateau, China
Parameter Altitude (fixed effect) Plot (random effect) R2m R2c
F P df P
SOC 278.85 <0.0001 3 0.3337 0.97 0.97
STN 190.63 <0.0001 3 0.0375 0.97 0.98
STP 3.29 0.0793 3 0.7781 0.24 0.28
NO- 3-N 25.80 <0.0001 3 0.9999 0.69 0.69
NH+ 4-N 174.17 <0.0001 3 0.0001 0.97 0.99
SOC:STN 15.87 0.0010 3 0.0013 0.75 0.90
SOC:STP 9.07 0.0059 3 0.9999 0.44 0.44
STN:STP 8.34 0.0076 3 0.9657 0.42 0.43
pH 544.42 <0.0001 3 0.0172 0.98 0.99
Leaf C 60.28 <0.0001 3 0.7182 0.85 0.86
Leaf N 368.61 <0.0001 3 0.0016 0.98 0.99
Leaf P 11.89 0.0026 3 0.7396 0.53 0.56
Leaf C:N 95.65 <0.0001 3 0.0434 0.94 0.96
Leaf C:P 50.99 <0.0001 3 0.9999 0.81 0.81
Leaf N:P 67.84 <0.0001 3 0.9999 0.85 0.85
Table 2 Effects of altitude and plot on soil properties and leaf stoichiometry of L. lentopodioides
Parameter Altitude (m)
2500 3000 3500 3800
SOC (g/kg) 12.75±0.29c 12.28±0.61c 58.64±1.65a 50.14±1.65b
STN (g/kg) 1.59±0.29c 1.35±0.96d 5.24±0.13a 4.72±0.13b
STP (g/kg) 0.48±0.01ab 0.31±0.03b 0.27±0.05b 0.53±0.12a
NO- 3_N (mg/kg) 4.57±0.29c 4.22±0.10c 27.11±4.13a 13.83±1.87b
NH+ 4-N (mg/kg) 4.50±0.23c 3.68±0.59d 17.79±0.45a 14.68±0.33b
SOC:STN 8.02±0.11d 9.22±0.35c 11.19±0.08a 10.62±0.24b
SOC:STP 26.42±0.87c 40.81±3.96b 307.11±79.17a 147.41±33.46a
STN:STP 3.29±0.08c 4.38±0.32b 27.24±6.90a 13.99±3.21a
pH 8.42±0.02b 8.52±0.03a 6.44±0.05c 6.12±0.03d
Table 3 Soil properties at different altitudes in the northeastern Qinghai-Tibetan Plateau, China
Fig. 2 Leaf C (a), N (b), P (c), C:N (d), C:P (e), and N:P (f) ratios of L. lentopodioides at different altitudes. Different lowercase letters indicate significant differences among different altitudes at P<0.05 level. Bars are standard errors.
Fig. 3 Redundancy analysis (RDA) result for the leaf stoichiometry of L. lentopodioides and environmental factors. SOC, soil organic carbon; STN, soil total nitrogen; STP, soil total phosphorus; MAT, mean annual temperature; MAP, mean annual precipitation.
Environmental factor Explains (%) F P
SOC 0.4 0.5 0.556
STN 0.5 0.7 0.448
STP 3.9 4.6 0.024
NO- 3-N 0.4 0.5 0.524
NH+ 4-N 50.8 35.0 0.002
SOC:STN 0.5 0.7 0.478
SOC:STP 0.2 0.3 0.718
STN:STP 0.3 0.4 0.556
MAT 2.7 3.4 0.036
MAP 2.4 3.3 0.046
pH 18.3 19.5 0.002
Table 4 Dominant environmental factors influencing leaf stoichiometry of L. lentopodioides at different altitudes
Fig. 4 Structural equation modeling (SEM) results for the effects of mean annual temperature (MAT), mean annual precipitation (MAP), NH+ 4-N, NO- 3-N, soil pH, soil total nitrogen (STN), and soil total phosphorus (STP) on leaf C (a), N (b), and P (c) of L. lentopodioides. GFI, goodness-of-fit index; RMSEA, root mean square error of approximation. *, P<0.05 level; **, P<0.01 level; ***, P<0.001 level.
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