Arid Zone Research ›› 2022, Vol. 39 ›› Issue (4): 1181-1190.doi: 10.13866/j.azr.2022.04.19

• Soil Ecology • Previous Articles     Next Articles

Desert shrub soil enzyme activity of UV-B radiation and litter decomposition response

WEI Changlin(),LI Yi(),SHAN Lishan,XIE Tingting   

  1. College of Forestry, Gansu Agricultural University, Lanzhou 730070, Gansu, China
  • Received:2021-09-07 Revised:2022-03-18 Online:2022-07-15 Published:2022-09-26
  • Contact: Yi LI E-mail:2603572411@qq.com;liyi@gsau.edu.cn

Abstract:

Exploring the response of soil enzyme activity to UV-B radiation and decomposition of different litters is crucial for revealing litter turnover and soil nutrient dynamics. The effects of UV-B radiation on soil enzyme activities of litters of Reaumuria soongarica and Salsola passerina and their mixture were studied by using simulated UV-B radiation filtration (mylar film method) and decomposition bag method. The following results are presented. (1) Radiation filtration increased the soil urease and alkaline phosphatase activities of different litters and promoted the soil enzyme activities of S. passerina shrub significantly, which increased by 45.45%, 58.28% and 39.04%, 117.65% in different soil layers (0-5 cm and 5-15 cm), respectively. The radiation filter minimizes the different litter reductions. However, soil polyphenol oxidase and peroxidase activities of lignin, which are the same soil enzyme activity of S. passerina thickets of inhibition effect, are observed in different soil reductions by 36.69%, 39.52% and 59.78%, 43.63%, respectively. Radiation filtration did not affect on soil cellulase activity. (2) Under radiation filtration and natural light conditions, the activity of polyphenol oxidase in the soil of mixed litters was lower than that of single litters, indicating that the degree of organic matter humification in the soil of mixed litters was larger than that of organic matter accumulation, and the degree of soil humification was high. (3) The effects of different litters on the enzyme activities of surface soil (0-5 cm) were observed. Soil urease and phosphatase activities decreased and polyphenol oxidase activities increased with the deepening of the soil layer.

Key words: UV-B radiation, litter, arid desert, soil enzyme