Scientia Agricultura Sinica ›› 2020, Vol. 53 ›› Issue (13): 2595-2603.doi: 10.3864/j.issn.0578-1752.2020.13.008

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• PROCESS AND MECHANISM OF TEMPERATE MEADOW STEPPE DEGRADATION • Previous Articles     Next Articles

Effect of Fairy Rings on Soil Respiration in Hulunber Meadow Steppe

FAN KaiKai,TONG XuZe,YAN YuChun,XIN XiaoPing,WANG Xu()   

  1. National Hulunber Grassland Ecosystem Observation and Research Station/Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081
  • Received:2019-09-04 Accepted:2020-02-19 Online:2020-07-01 Published:2020-07-16
  • Contact: Xu WANG E-mail:wangxu01@caas.cn

Abstract:

【Objective】 Circles of mushrooms coupled with regular rings or arcs of greener plants are commonly observed in grassland. This pattern is often referred to as ‘fairy rings’. Indeed, fairy ring funguses not only affect plant growth but also greatly modify the soil quality and microbial populations, thus indirectly have impact on soil respiration. The aim of this study was to observe soil respiration of the fairy rings to accurately estimate greenhouse gas emissions from grassland soil. 【Method】 Measurement of soil respiration of the outside (OUT), on (ON) and inside (IN) the rings was conducted by Li-8100 automatic instrument. Meanwhile, soil temperature and soil water content were measured by the monitoring instrument CJTP-101 and TDR 300. The biomass and soil nutrients through field investigation on fairy rings were also measured. 【Result】 The average aboveground biomass of ON zone was 246.2 g·m -2, significantly higher than that of IN (153.1 g·m-2) and OUT (132.6 g·m-2) zones, which was 1.62 times of IN zone and 1.86 times of OUT zone. The average belowground biomass of ON zone was 763.9 g·m-2, less than that of IN (927.4 g·m-2) and OUT (824.8 g·m-2) zones, and there was no significant difference (P>0.05) of the belowground biomass among them. The litter of ON zone was 17.9 g·m-2, higher than that of IN (13.1 g·m-2) and OUT (9.6 g·m-2) zones, and there was no significant difference in different zones (P>0.05). The available nitrogen and phosphorus of ON zone were 52.2 and 7.8 mg?kg-1, significantly higher than that in IN and OUT zones (P>0.05), respectively. The available nitrogen was 42% and 40% higher than the IN and OUT zones, and the available phosphorus was 53% and 59% higher than the IN and OUT zones, respectively. The organic matter and total nitrogen of ON zone were 3 560.1 and 319.8 mg?kg-1, respectively, less than that in IN and OUT zones. The total phosphorus of ON zone was 502.2 mg?kg-1, higher than the IN and OUT zones, but the difference was not significant (P>0.05). The average soil respiration rate (SRR) of ON zone was 5.26 μmol·m-2·s-1, significantly higher than IN and OUT zones which were 4.07 and 4.17 μmol·m -2·s-1, respectively. The significantly relationship were found between the SRR and soil temperature and soil water content (P<0.01). 【Conclusion】 It was suggested that the soil temperature and soil water content were not the dominant factors. And the enhancement of soil respiration in the ON zone was related to the higher available nutrients and stronger microbial and enzyme activities.

Key words: fairy rings, grassland ecosystem, soil respiration, temperature, soil water content, soil nutrient

Fig. 1

Quadrat setting"

Fig. 2

Comparison of aboveground biomass, belowground biomass and litter in fairy rings N, S, W indicate inside, on and outside the fairy rings, respectively. Different lowercase letters indicate significant difference among treatments (P<0.05). The same as below"

Table 1

Relationship between soil respiration and biomass"

项目
Project
土壤呼吸
Soil respiration
地上生物量
Aboveground biomass
地下生物量
Belowground biomass
枯落物
Litter
土壤呼吸Soil respiration 1.00
地上生物量Aboveground biomass 0.13 1.00
地下生物量Belowground biomass 0.23 -0.12 1.00
枯落物Litter 0.54** 0.30* 0.46** 1.00

Table 2

Soil nutrient surrounding the fairy ring"

蘑菇圈位置
Zone
有机质
Organic matter (mg?kg-1)
全氮
Total
nitrogen (mg?kg-1)
全磷
Total phosphorus (mg?kg-1)
速效氮
Available nitrogen
(mg?kg-1)
速效磷
Available phosphorus
(mg?kg-1)
速效钾
Available potassium
(mg?kg-1)
圈内IN 3685.4±107.9 321.5±92.9 494.3±123.2 36.8±2.3b 5.1±0.3b 303.8±8.2
圈上ON 3560.1±163.3 319.8±63.2 502.2±138.6 52.2±5.8a 7.8±0.7a 331.9±12.3
圈外OUT 3572.4±111.6 321.3±94.8 486.9±171.3 37.2±4.0b 4.9±0.4b 310.6±12.1

Fig. 3

Soil respiration, soil temperature and soil water content in fairy rings"

Fig. 4

The relationship among soil respiration rate, soil temperature, and soil water content"

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