Chin J Plan Ecolo ›› 2018, Vol. 42 ›› Issue (1): 133-142.doi: 10.17521/cjpe.2017.0120

• Research Articles • Previous Articles    

Characteristics of nutrients in two dominant plant species and rhizospheric soils in alpine desert of the Qinghai-Xizang Plateau under contrasting climates

GOU Xiao-Lin1,2,ZHOU Qing-Ping1,2,*(),CHEN You-Jun1,2,WEI Xiao-Xing1,TU Wei-Guo3   

  1. 1 Key Laboratory of Use of Forage Germplasm Resources on Tibetan Plateau of Qinghai Provence, Institute of Grazing & Veterinarian, Qinghai University, Xining 810016, China;

    2 Institute of Qinghai-Tibetan Plateau, Southwest Minzu University, Chengdu 610041, China

    3 Sichuan Province Natural Resources Science Academy, Chengdu 610015, China
  • Online:2018-01-18 Published:2018-01-20
  • Contact: Qing-Ping ZHOU E-mail:qpingzh@yahoo.com.cn
  • Supported by:
    Supported by the National Key Technology Research and Development Program of the Ministry of Science and Technology of China(2015BAC05B01);the Special Funds of Sichuan, China(2015SZ0062)

Abstract:

Aims This study was conducted to determine the responses of nutrients in plants and rhizospheric soils to climate in alpine-cold desert on the Qinghai-Xizang Plateau.

Methods Tissue samples for two dominant plant species, Hippophae rhamnoides subsp. sinensis and Artemisia desertorum, and associated rhizospheric soil samples were collected from sites representing semi-arid and sub-humid climates in the alpine-cold desert on the Qinghai-Xizang Plateau. Measurements were made on the contents of carbon, nitrogen and phosphorus in roots and shoots, as well as on organic carbon, total nitrogen, total phosphate, ammonium nitrogen, nitrate nitrogen and available phosphate in rhizospheric soils in the 0-10 cm and 10-20 cm layer. The relationship between nutrients in plant tissues and rhizospheric soils and the influencing factors were analyzed.

Important findings There were significant differences between the semi-arid and the sub-humid sites in tissue nutrients and rhizospheric soil nutrients for the two specie. Specifically, the contents of carbon, nitrogen, phosphorus in plant tissues differed significantly between the semi-arid and the sub-humid sites. Soil organic carbon, total nitrogen, ammonium nitrogen, nitrate nitrogen and available phosphate for the rhizosphere of A. desertorum were significantly higher on site under sub-humid climate than that under semi-arid climate; whereas the trend was reversed for the rhizosphere of H. rhamnoides subsp. sinensis. We found significant relationships between the tissue nutrients and soil nutrients, and significantly different plant nutrient ratios between the two species. There were negative correlations between tissues and rhizosheric soils in N:P ratio for A. desertorum and C:N ratio for H. rhamnoides subsp. sinensis under different climates.

Key words: Qinghai-Xizang Plateau, vegetal nutrients, soil nutrients, Hippophae rhamnoides subsp. sinensis, Artemisia desertorum

Fig. 1

Comparisons of major nutrients in plant tissues between two different climatic conditions (mean ± SD, n = 3). *, ** and ns indicate that the differences between semi-arid and sub-humid conditions are significant at the levels of 0.05 and 0.01, and not significant, respectively. BL, branches and leaves; Root, roots. SA, semi-arid; SH, semi-humid."

Fig. 2

Comparisons of major nutrients and pH value in rhizospheric soils between two different climatic conditions (mean ± SD, n = 3). ** and ns indicate that the differences between semi-arid and sub-humid conditions are significant at the 0.01 level, and not significant, respectively. SA, semi-arid; SH, sub-humid."

Fig. 3

Comparisons of dissolved nutrients in rhizospheric soils between two climatic conditions (mean ± SD, n = 3). ** indicate that the differences between semi-arid and sub-humid conditions are significant at the 0.01 level. SA, semi-arid; SH, sub-humid."

Table 1

Comparisons of nutrient ratios in tissues and rhizospheric soils between two climatic conditions"

植物或根际土壤类型
Plant or rhizospheric soil
器官或土层
Tissue or soil layer
气候
Climate
碳氮比 C:N (SC:SN) 碳磷比 C:P (SC:SP) 氮磷比 N:P (SN:SP)
M SD M SD M SD
沙蒿
Artemisia desertorum

Roots
SA 39.493b 0.906 199.046b 5.998 5.039a 0.037
SH 87.596a 1.527 284.528a 10.402 3.247b 0.063
枝叶
Branches and leaves
SA 28.666b 0.531 166.050b 6.180 5.791a 0.120
SH 66.201a 2.762 289.091a 19.047 4.366b 0.175
中国沙棘
Hippophae rhamnoides subsp. sinensis

Roots
SA 30.730b 0.514 344.732b 23.832 11.213a 0.634
SH 38.210a 0.489 425.255a 38.610 11.139a 1.155
枝叶
Branches and leaves
SA 26.596b 0.755 174.307a 6.129 6.561a 0.384
SH 32.697a 0.497 178.604a 7.098 5.461b 0.137
沙蒿根际土壤
Rhizospheric soil of Artemisia desertorum
0-10 cm SA 7.950a 0.752 11.528b 1.336 1.448b 0.048
SH 8.481a 0.519 15.761a 2.008 1.860a 0.215
10-20 cm SA 9.694a 1.384 16.668b 3.595 1.709b 0.180
SH 9.233a 1.247 32.617a 7.558 3.540a 0.787
中国沙棘根际土壤
Rhizospheric soil of Hippophae rhamnoides subsp. sinensis
0-10 cm SA 16.085a 0.334 25.857a 1.315 1.607a 0.066
SH 8.266b 0.440 9.920b 0.242 1.202b 0.061
10-20 cm SA 10.999a 0.486 24.849a 2.788 2.265a 0.305
SH 9.567b 0.303 16.118b 3.423 1.679a 0.309

Table 2

Pearson’s correlations of nutrients between plant tissues and rhizospheric soils"

土层
Soil layer
养分
Nutrient
沙蒿 Artemisia desertorum 中国沙棘 Hippophae rhamnoides subsp. sinensis
枝叶 Branches and leaves 根 Roots 枝叶 Branches and leaves 根 Roots
C N P C N P C N P C N P
0-10 cm SOC 0.96** -0.975** -0.953** 0.827* -0.976** -0.949** 0.983*** 0.992*** 0.802ns -0.972** 0.986*** 0.765ns
STN 0.989*** -0.985*** -0.991*** 0.861* -0.979** -0.986*** 0.979** 0.968** 0.799ns -0.954** 0.994*** 0.707ns
STP 0.42ns -0.348ns -0.427ns 0.596ns -0.333ns -0.308ns -0.415ns -0.654ns -0.425ns 0.65ns -0.481ns -0.293ns
SNN 0.915* -0.942** -0.908* 0.77ns -0.951** -0.926** 0.982*** 0.991*** 0.816* -0.967** 0.985*** 0.768ns
SAN 0.997** -0.996*** -0.990*** 0.906* -0.993*** -0.979** 0.974** 0.996*** 0.779ns -0.98** 0.978** 0.752ns
SAP 0.906* -0.866* -0.899* 0.903* -0.848* -0.833* 0.966** 0.99*** 0.746ns -0.974** 0.968** 0.712ns
10-20 cm SOC 0.945** -0.963** -0.939** 0.761ns -0.96** -0.955** 0.982*** 0.964** 0.781ns -0.954** 0.969** 0.845*
STN 0.995*** -0.996*** -0.997*** 0.867* -0.994*** -0.994*** 0.982*** 0.958** 0.813* -0.931** 0.963** 0.849*
STP 0.239ns -0.193ns -0.192ns 0.615ns -0.185ns -0.112ns 0.576ns 0.703ns 0.376ns -0.77ns 0.664ns 0.253ns
SNN 0.993*** -0.999*** -0.987*** 0.875* -0.997*** -0.987*** 0.991*** 0.983*** 0.798ns -0.97** 0.995*** 0.761ns
SAN 0.994*** -0.996*** -0.986*** 0.9* -0.995*** -0.979** 0.963** 0.99*** 0.732ns -0.98** 0.961** 0.738ns
SAP 0.986*** -0.98** -0.989*** 0.902* -0.977** -0.982** 0.933** 0.994*** 0.75ns -0.993** 0.956** 0.714ns

Table 3

Pearson’s correlations of nutrient ratios between plant tissues and rhizospheric soils under two climatic conditions"

植物
Plant
土层
Soil layer (cm)
养分比
Nutrient ratio
枝叶 Branches and leaves 根 Roots
C:N C:P N:P C:N C:P N:P
沙蒿
Artemisia
desertorum
0-10 SC:SN 0.397ns 0.332ns -0.505ns 0.422ns 0.336ns -0.482ns
SC:SP 0.826* 0.758ns -0.901* 0.833* 0.807ns -0.842*
SN:SP 0.864* 0.814* -0.902* 0.86* 0.87* -0.843*
10-20 SC:SN -0.218ns -0.29ns 0.114ns -0.22ns -0.261ns 0.189ns
SC:SP 0.884* 0.869* -0.865* 0.866* 0.89* -0.843*
SN:SP 0.923** 0.937* -0.865* 0.906* 0.94** -0.873*
中国沙棘
Hippophae rhamnoides subsp. sinensis
0-10 SC:SN -0.983*** -0.358ns 0.919* -0.983*** -0.85* 0.015ns
SC:SP -0.993*** -0.35ns 0.938** -0.981** -0.815* 0.076ns
SN:SP -0.991*** -0.369ns 0.933** -0.959** -0.738ns 0.183ns
10-20 SC:SN -0.892* -0.152ns 0.895* -0.907* -0.862* -0.118ns
SC:SP -0.8ns -0.359ns 0.709ns -0.843* -0.909* -0.316ns
SN:SP -0.689ns -0.373ns 0.583ns -0.731ns -0.843* -0.374ns
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