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Chinese Journal of Applied Ecology ›› 2017, Vol. 28 ›› Issue (10): 3360-3368.doi: 10.13287/j.1001-9332.201710.037

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Diversity of soil nematode communities in the subalpine and alpine forests of western Sichuan, China.

CHEN Ya1,2, YANG Wan-qin1,2, WU Fu-zhong1,2, YANG Fan1,2, LAN Li-ying1,2, LIU Yu-wei1,2, GUO Cai-hong1,2, TAN Bo1,2*   

  1. 1. Institute 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;
    2. Collaborative Innovation Center of Ecological Security in the Upper Reaches of Yangtze River, Chengdu 611130, China
  • Received:2017-05-05 Revised:2017-07-15 Online:2017-10-18 Published:2017-10-18
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (31500509, 31570445, 31500358, 31670526, 31622018), the Youth Project of Sichuan Provincial Department of Education (14ZB0001), the Project of Research Interest Training in Sichuan Agricultural University (ky2016204), and the College Students’ Innovative Training Program of Sichuan Province (1510626065).

Abstract: In order to understand the diversity of soil nematodes in the subalpine/alpine forests of the eastern Qinghai-Tibet Plateau, soil nematodes in the primary forest, mixed forest and secondary forest of Abies faxoniana were extracted by elutriation and sugar-centrifugation method in July 2015, and the composition and structure characteristics of soil nematode communities were studied in the three forests at different altitudes. A total of 37950 soil nematodes were collected, which belonged to 20 families and 27 genera, and the mean density was 4217 ind·100 g-1 dry soil. Filenchus was the dominant genus in the primary forest, and Filenchus and Pararotylenchus in the mixed forest and secondary forest, respectively. The individual number of each dominant genus was significantly affected by forest type. All nematode individuals were classified into the four trophic groups of bacterivores, fungivores, plant-parasites and omnivore-predators. The fungivores were dominant in the primary and secondary forest and the bacterivores in the mixed forest. The number of soil nematode c-p (colonizer-persister) groups of c-p 1, c-p 2, c-p 3 and c-p 4 accounted for 6.1%, 51.1%, 30.0% and 12.7% of the total nematode abundance, respectively. The maturity index (MI), the total maturity index (∑MI) and the plant parasitic index (PPI) of soil nematodes decreased gradually with the increase of altitude. The nematode channel ratio in the mixed forest was higher than 0.5, but that in the primary forest and secondary forest was below 0.5. The forest type significantly affected the soil nematode maturity index and channel ratio, but the forest type, soil layer and their interaction had no significant effect on the diversity index. There were obvious diffe-rences in the composition, nutrient structure and energy flow channel of soil nematodes in the subalpine/alpine forests of western Sichuan, providing an important reference for understanding the function of soil nematodes in soil processes of this region.