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Chinese Journal of Applied and Environmental Biology. 2021, (05) Core

Chemical properties and extracellular enzymatic activity in the rhizosphere soil of Abies fabri at different altitudes on Mount GonggaChinese Full TextEnglish Full Text (MT)

NING Peng;CHENG Xiaomao;YANG Xiaofeng;HUANG Xiaoxia;Southwest Landscape Architecture Engineering Research Center of State Forestry and Grassland Administration, College of Landscape and Horticulture, Southwest Forestry University;

Abstract: This study investigated the vertical distribution pattern of soil chemical properties, microbial biomass（MBC, MBN, and MBP）, and extracellular enzyme activities in the rhizosphere of Abies fabri（Mast.） Craib on Gongga Mountain, aiming to provide a theoretical basis for the protection and restoration of the subalpine ecosystem in the western Sichuan region of China. The rhizospheres of Abies fabri at five altitudes, 2 800 m（A1）, 3 000 m（A2）, 3 200 m（A3）, 3 500 m（A4）, and 3 800 m（A5）, on Gongga Mountain were selected as the research object in this study. They were analyzed in terms of their soil chemical properties, microbial biomass,and the activity of extracellular enzymes（acid phosphatase（AP）, polyphenol oxidase（PPO）, peroxidase（PER）） and their influencing factors. Results showed that（1） the soil water content（SM） and levels of soluble organic carbon（DOC）, total nitrogen（TN）, and nitrate nitrogen（NO3--N） first decreased and then increased with increases in altitude; the maximum was at altitude A1 and the turning point was at altitude A3; the total phosphorus（TP） and available phosphorus（AVP） levels increased with increasing altitude. The N/P ratios at A1,A2, and A3 were higher than the mean N/P ratios of terrestrial ecosystems in China, indicating that phosphorus was scarce in the study area.（2） The MBC/MBN ratio ranged from 1–3, indicating that soil humification and carbon sequestration capacities were weak in this study area. The MBC/MBP and MBN/MBP ratios were significantly higher at A1 than at other altitudes, indicating that phosphorus was more deficient at the latter.（3）The activities of AP and PPO decreased with increase in altitude and were closely related to the TN content while the activity of the PER enzyme was not significantly affected by altitude; the activities of all three enzymes were the highest at A1. In summary, the chemical properties, microbial biomass, and extracellular enzyme activities of the rhizosphere of Abies fabri were significantly different at different altitudes. TN is a key factor affecting changes in soil enzyme activity along the altitude gradient. Soil nutrient content was the highest at the lowest altitude, 2 800 m; however, it was more susceptible limits in phosphorus at this altitude than at others.
Keywords：

altitude gradient; Abies fabri; soil chemical property; microbial biomass; rhizospheric extracellular enzyme;

  • DOI：

    10.19675/j.cnki.1006-687x.2020.11062

  • Series：

    (A) Mathematics/ Physics/ Mechanics/ Astronomy; (B) Chemistry/ Metallurgy/ Environment/ Mine Industry; (D) Agriculture

  • Subject：

    Physical Geography and Topography; Forestry; Fundamental Science of Agriculture

  • Classification Code：

    S714

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