1. Crop tree release increased the density of soil nematodes and improved the food web structure
- Author
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Yin, Haifeng, Su, Yu, Li, Xianwei, Fan, Chuan, Chen, Gang, Feng, Maosong, Liu, Size, Guo, Maojin, Li, Xiangjun, Chen, Yuqin, and Wu, Dayu
- Subjects
Nematoda -- Distribution ,Food chains (Ecology) -- Structure ,Tree crops -- Management ,Forest thinning -- Management ,Company business management ,Company distribution practices ,Earth sciences - Abstract
As a special thinning method, crop tree release (CTR) has a beneficial effect on forest environments and structures by changing forest light, heat, and water. However, the impact of CTR on underground biodiversity remains unclear. Therefore, we analyzed the composition, diversity, and metabolic footprints of soil nematode communities under three CTR (100, 150, and 200 trees [ha.sup.-1]) treatments, as well as a no CTR treatment, in Pinus massoniana Lamb. plantations. The results showed that CTR increased the density of soil nematodes (P < 0.05), the number of omnivore-predator nematodes (P < 0.05), and the diversity (H') of nematodes (P < 0.05) and enriched the food web structure of soil nematodes. In the medium CTR density treatment (150 trees [ha.sup.-1]), the nematode density and diversity (H') were the highest (P < 0.05), the number of omnivore-predator nematodes was also the highest (P < 0.05), and the enrichment index and structure index values of the soil nematodes reached the maximum at the depth of 0-10 cm (P < 0.05). Our results indicated that the community structure of soil nematodes became more stable and mature after CTR, which may be attributed to the changes of soil condition, especially soil organic matter, and plant diversity indirectly. Key words: disturbance, Pinus massoniana, soil environment, soil nematode community, trophic groups. En tant que methode speciale d'eclaircie, le degagement des arbres d'avenir (DAA) a un effet benefique sur la structure de la foret et le milieu forestier en modifiant les conditions de lumiere, de temperature et d'humidite. Cependant, l'impact du DAA sur la biodiversite souterraine est encore nebuleux. Par consequent, nous avons analyse la composition, la diversite et l'empreinte metabolique des communautes de nematodes du sol dans trois traitements de DAA (100,150 et 200 tiges [ha.sup.-1]), ainsi qu'un temoin non traite dans des plantations de Pinus massoniana Lamb. Les resultats montrent que le DAA augmente la densite des nematodes du sol (P < 0,05), le nombre de nematodes predateurs et omnivores (P < 0,05), la diversite (H') des nematodes (P < 0,05) et qu'il enrichit la structure du reseau trophique des nematodes du sol. Dans le traitement de DAA avec une densite moyenne (150 tiges [ha.sup.-1]), la densite et la H' des nematodes etaient les plus elevees (P < 0,05), le nombre de nematodes predateurs et omnivores etaient aussi le plus eleve (P < 0,05) et les valeurs de l'indice d'enrichissement et de l'indice de structure des nematodes du sol atteignaient le maximum a une profondeur de 0-10 cm (P < 0,05). Nos resultats indiquent que la structure de la communaute de nematodes du sol est devenue plus stable et plus mature apres le DAA, ce qui peut etre attribue aux changements dans la condition du sol, plus particulierement la matiere organique dans le sol et indirectement la diversite de la vegetation. [Traduit par la Redaction] Mots-cles: perturbation, Pinus massoniana, environnement edaphique, communaute de nematodes du sol, groupes trophiques., 1. Introduction Human disturbance affects forest biodiversity and forest ecosystem stability (Johnstone et al. 2016; Zhang et al. 2017). On the one hand, massive deforestation (an acute disturbance) can lead [...]
- Published
- 2021
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