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Chinese Journal of Applied Ecology ›› 2018, Vol. 29 ›› Issue (3): 757-764.doi: 10.13287/j.1001-9332.201803.002

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Effects of naphthalene on soil respiration, dissolved organic matter and microbial biomass in the subalpine forest of western Sichuan, China.

YANG Fan1,2, YANG Wan-qin1,2, WU Fu-zhong1,2, XUE Qiao3, LIU Yu-wei1,2, GUO Cai-hong1,2, CHEN Ya1,2, TAN Bo1,2*   

  1. 1Institute of Ecology & Forestry, Sichuan Agricultural University/Sichuan Province Key Laboratory of Forestry Ecological Engineering in Upper Reaches of Yangtze River/Alpine Forest Ecosystem Research Station/Sichuan Province Key Laboratory of Soil and Water Conservation and Desertification Control, Chengdu 611130, China;
    2Collaborative Innovation Center of Ecological Security in the Upper Reaches of Yangtze River, Chengdu 611130, China;
    3Lixian Forestry Bureau, Lixian 623100, Sichuan, China
  • Received:2017-07-23 Online:2018-03-18 Published:2018-03-18
  • Contact: * E-mail: bobotan1984@163.com
  • Supported by:

    This work was supported by the National Key Research and Development Program of China, the National Natural Science Foundation of China (31500509, 31570445, 31500358, 31670526, 31622018), the Youth Project of Sichuan Provincial Department of Education (14ZB0001), and the Project of Research Interest Training in Sichuan Agricultural University (ky2016204)

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Abstract: The effects of naphthalene on soil respiration, dissolved organic matter and microbial biomass, and its inhibition efficiency for soil fauna of subalpine forest in western Sichuan were studied by in situ control experiment. The results showed that naphthalene application significantly inhibited the individual density and group number of soil macro- and meso-/micro- arthropods, with the individual density being decreased by 76.3%-78.5% and 83.3%-84.8% respectively, and the number of groups being decreased by 48.3%-56.1% and 45.8%-58.3%, respectively. The seasonal dynamics of soil respiration rate showed single peak curves in both naphthalene treatment and control. The lowest and the highest soil respiration rates were observed in February and August, respectively. The naphthalene treatment had little effect on soil respiration. Compared with the control, naphthalene treatment significantly reduced the contents of soil dissolved carbon and dissolved nitrogen in August and October as well as microbial biomass carbon (MBC) in April and August, but increased MBC/MBN in April. The naphthalene treatment and sampling time significantly interacted to affect the MBC and MBN, but had no significant effect on individual density, the number of groups of soil fauna and DC content. In all, naphthalene as biocide could effectively inhibit the soil arthropods and had no significant effect on soil respiration, but it had varying degrees of effects on soil carbon and nitrogen components in subalpine forest of western Sichuan.