Chin J Plant Ecol ›› 2019, Vol. 43 ›› Issue (1): 46-54.doi: 10.17521/cjpe.2018.0100

• Research Articles • Previous Articles     Next Articles

Nitrogen and phosphorus stoichiometric homoeostasis in leaves of dominant sand-fixing shrubs in Horqin Sandy Land, China

NING Zhi-Ying1,2,LI Yu-Lin1,*(),YANG Hong-Ling1,2,ZHANG Zi-Qian1,2   

  1. 1 Naiman Desertification Research Station, Northwest Institute of Eco-Environment and Resource, Chinese Academy of Sciences, Lanzhou 730000, China
    2 University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2018-05-04 Accepted:2018-12-24 Online:2019-04-23 Published:2019-01-20
  • Contact: LI Yu-Lin E-mail:liyl@lzb.ac.cn
  • Supported by:
    Supported by the National Natural Science Foundation of China(31270501);the National Key R&D Program of China(2016YFC0500907)

Abstract:

Aims Sand-fixing shrubs play an irreplaceable role in ecological restoration and eco-environmental protection in arid and semiarid regions of northern China. Determination of the stoichiometric homoeostasis of dominant sand-fixing shrubs along soil nutrient gradients could provide insights into ecological adaptability and pattern of changes of sand-fixing vegetation in Horqin Sandy Land.
Methods We measured N and P concentrations in leaves of two dominant sand-fixing shrubs Caragana microphylla and Artemisia halodendron, and the total and available N and P concentrations in soils beneath the canopy of each shrub. The differences between the two shrubs in N and P concentrations and N:P of leaves and soils as well as in stoichiometric homoeostasis were examined.
Important findings Caragana microphylla had higher leaf N concentration and lower leaf P concentration, thereby higher leaf N:P, than A. halodendron. Soils beneath the shrub canopies, regardless of the species, had higher total and available N and P concentrations relative to soils outside the canopy cover. Moreover, the total and available N and P concentrations in soils beneath the C. microphylla canopy were higher than that beneath the A. halodendron canopy. The stoichiometric homoeostasis indexes (H) were ranked in the order of HP > HN:P > HN in A. halodendron and HN:P > HN > HP in C. microphylla, respectively, suggesting N limitation in A. halodendron and P limitation in C. microphylla. Therefore, Caragana microphylla could be used as nursing plants in degraded N-limiting soil because of high HN. However, due to excessive uptake of N, Caragana microphylla might suffer from P limitation, and adequate P supply should be considered during the restoration process in sandy land.

Key words: Horqin Sandy Land, shrub, leaf, soil, stoichiometric homoeostasis

Table 1

Nitrogen (N) and phosphorus (P) concentrations and their ratios in leaves of Artemisia halodendron and Caragana microphylla in Horqin Sandy Land (mean ± SE)"

物种
Species
指标
Index
算数平均值
Arithmetic average
中位数
Median
众数
Mode
变异系数
Coefficient of variation(%)
极小值
Minimum value
极大值
Maximum value
盐蒿
A. halodendron
N (g·kg-1) 23.24 ± 0.49 24.50 27.00 18.71 15.00 31.40
P (g·kg-1) 3.80 ± 0.05 3.82 3.67 11.05 2.86 4.53
N:P 6.10 ± 0.10 6.17 5.59 14.43 4.02 7.82
小叶锦鸡儿
C. microphylla
N (g·kg-1) 30.44 ± 0.46 31.00 30.40 13.24 18.20 37.90
P (g·kg-1) 1.96 ± 0.04 1.97 1.97 17.86 1.24 2.69
N:P 15.86 ± 0.29 15.71 11.28 15.82 11.28 24.33

Fig. 1

Comparisons of leaf nitrogen (N) and phosphorus (P) stoichiometry between Artemisia halodendron and Caragana microphylla in Horqin Sandy Land. Differences between Artemisia halodendron and Caragana microphylla are significant at p < 0.001. Vertical bars represent standard errors. Ar, Artemisia halodendron; Ca, Caragana microphylla."

Table 2

Nitrogen (N) and phosphorus (P) stoichiometry in soils beneath Artemisia halodendron and Caragana microphylla in Horqin Sandy Land (mean ± SE)"

物种
Species
指标
Index
算数平均值
Arithmetic average
中位数
Median
众数
Mode
变异系数
Coefficient of variation(%)
极小值
Minimum value
极大值
Maximum value
盐蒿
A. halodendron
N (g·kg-1) 0.15 ± 0.01 0.14 0.17* 57.14 0.01 0.38
P (g·kg-1) 0.05 ± 0.00 0.05 0.03* 60.00 0.00 0.11
N:P 3.10 ± 0.26 2.38 0.43 73.22 0.43 12.10
速效 N Available N (mg·kg-1) 15.77 ± 1.00 16.20 21.60 56.04 1.17 38.00
速效 P Available P (mg·kg-1) 7.82 ± 0.57 6.80 9.80 64.32 1.28 20.06
速效 N:P Available N:P 2.27 ± 0.12 2.20 3.60 46.70 0.59 5.77
小叶锦鸡儿
C. microphylla
N (g·kg-1) 0.23 ± 0.02 0.21 0.02 69.56 0.02 0.65
P (g·kg-1) 0.08 ± 0.01 0.07 0.03 62.50 0.01 0.19
N:P 3.08 ± 0.21 2.87 0.76 61.04 0.76 11.99
速效 N Available N (mg·kg-1) 19.38 ± 1.08 16.88 9.43* 48.81 7.39 44.86
速效 P Available P (mg·kg-1) 9.74 ± 0.55 8.60 6.10* 49.90 2.93 24.80
速效 N:P Available N:P 2.11 ± 0.07 2.11 0.35* 27.49 0.35 3.91

Fig. 2

Comparisons of soil nitrogen (N) and phosphorus (P) stoichiometry between Artemisia halodendron and Caragana microphylla in Horqin Sandy Land. Differences between Artemisia halodendron and Caragana microphylla are significant at p < 0.001. Vertical bars represent standard errors. Ar, Artemisia halodendron; Ca, Caragana microphylla."

Fig. 3

Relationships of leaf N, P, and N:P with soil N, P, and N:P in two dominant shrubs in Horqin Sandy Land. H, stoichiometric homoeostasis indexes."

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