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Response of carbon and nitrogen processes to warming as mediated by ectomycorrhizae of Picea asperata *(PDF)

Chinese Journal of Applied & Environmental Biology[ISSN:1006-687X/CN:51-1482/Q]

2019 06
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Response of carbon and nitrogen processes to warming as mediated by ectomycorrhizae of Picea asperata *
HUANG Yan1 2 LI Yuejiao1 FAN Lihua3 ZHANG Ziliang1 2 MA Zhiliang4 ZHANG Lin5 & ZHAO Chunzhang1**
1CAS Key Laboratory Ecological Restoration and Bioresource Utilization & Ecological Restoration and Biodiversity Conservation Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China
2University of Chinese Academy of Sciences, Beijing 100049, China
3College of Life Sciences, Sichuan Normal University, Chengdu 610101, China
4College of Science, China West Normal University, Nanchong 637009, China
5Key Laboratory of Tibetan Environment Changes and Land Surface Processes, Chinese Academy of Sciences, Beijing 100085, China
ectomycorrhiza hyphae warming soil enzyme activity soil carbon and nitrogen process

It is important to estimate the respective influence of ectomycorrhiza and external hyphae of Picea asperata on the C and N cycling in subalpine coniferous forest ecosystems under future warming. In this study, infrared heaters were used to simulate warming, and growth tubes with different diameter pores were employed to separate soil for R soil (fine roots), H soil (external hyphae) and C soil (without root and hyphae) in the plots planted with P. asperata. Effects of warming on the physicochemical properties, soil organic carbon (SOC), microbial biomass, microbial biomass and soil enzyme activities in the three ingrowth core soils were determined. The results showed that warming significantly reduced the content of soil moisture content, NO3--N and NH4+-N content (P < 0.05), significantly increased β-D-glucosidase (BG) and N-acetylglucosidase (NAG) activities (P < 0.05), and had no significant effects on the pH, SOC, and ectomycorrhizal fungal (ECMf) biomass (P > 0.05). On the other hand, whether warming or not, there is no significant difference of SOC content, BG and NAG activities between R and H soil. However, the contents of NO3--N, NH4+-N and SOC, ECMf biomass, and the activities of BG and NAG were much higher in R and H soil than those in C soil. Additionally, NO3--N and NH4+-N contents, as well as ECMf biomass of H soil were about 66%, 82.1% and 74.1% of these of R soil in unwarmed plots, respectively, however, these parameter were up to 95.4%, 98.2%, 94.2% in warmed plot, so the disparity of these parameters between H and R soil were obviously reduced by warming. The results indicated that external hyphae as an important component of P. asperata root systems possibly has equivalent effects to roots on soil C and N processes, especially on SOC and the key soil enzyme activities, and these effects of hyphae would be further amplified by future climate warming.




Last Update: 2019-05-09