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Edible mycorrhizal fungi (EMF) are a valuable forest resource, both in terms of their ecological functions as a symbiont of host trees and because of their edible sporocarps. In this study, we characterized the morphological features of Suillus bovinus, a dominant EMF associated with Pinus massoniana Lamb., and conducted a 3-year field survey to clarify the phenology of S. bovinus sporocarps. The morphological features of S. bovinus were generally in accordance with those reported by previous studies, and S. bovinus sporocarp production was largely influenced by meteorological conditions and the intra-annual growth rhythm of P. massoniana. The monthly fruiting pattern of sporocarps correlated with monthly variations in temperature (P < 0.01) and precipitation (P < 0.05). Sporocarp productivity increased as the temperature or precipitation increased and it decreased as the temperature or precipitation decreased. The correlation between P. massoniana growth stages and the production of mature sporocarps was also significant (P Key words: Suillus bovinus, sporocarp phenology, Pinus massoniana, ectomycorrhiza. Les champignons mycorhiziens (CEM) comestibles ont une valeur en tant que ressources forestieres, tant par leurs fonctions ecologiques comme symbiotes des arbres hotes que par la valeur economique de leurs sporocarpes comestibles. Dans cette etude, nous avons caracterise les traits morphologiques de Suillus bovinus, un CEM dominant associe a Pinus massoniana Lamb. et nous avons realise un inventaire sur le terrain d'une duree de trois ans pour clarifier la phenologie des sporocarpes de S. bovinus. Les traits morphologiques de S. bovinus correspondaient generalement a ceux qui ont ete rapportes dans les etudes precedentes et la production de sporocarpes de S. bovinus etait largement influencee par les conditions meteorologiques et le rythme de croissance intra-annuelle de P. massoniana. Le patron mensuel de fructification des sporocarpes etait correle aves les variations mensuelles de temperature (P < 0,01) et de precipitation (P < 0,05). La productivite des sporocarpes augmentait avec l'augmentation de la temperature ou des precipitations et diminuait avec la diminution de la temperature ou des precipitations. La correlation entre les stades de croissance de P. massoniana et la production de sporocarpes matures etait aussi significative (P < 0,01) : les sporocarpes etaient formes surtout durant le stade d'elongation de la pousse, le stade d'arret de la croissance de la pousse et la periode de croissance vegetative. Les donnees de productivite des sporocarpes plus l'evaluation economique indiquent qu'une quantite considerable de sporocarpes de S. bovinus pourrait etre produite dans les plantations de P. massoniana, ce qui meriterait une exploitation commerciale accrue. Pour faciliter l'exploitation, on devrait tenir compte des traits morphologiques de l'association formee par S. bovinus et P. massoniana ainsi que des facteurs qui influencent la fructification de S. bovinus. [Traduit par la Redaction] Mots-cles : Suillus bovinus, phenologie du sporocarpe, Pinus massoniana, ectomycorhizes., Introduction Ectomycorrhizal fungi form mutually beneficial relationships with a series of tree species, including pines, that efficiently improve the performance of the host trees and contribute to forest health (Smith [...]

Pruning is an important technique in culturing good knot-free timber. However, to make more accurate pruning plans, it is necessary to consider the growing status of trees and set reasonable pruning intensities based on this. In a seven-year-old Pinus massoniana Lamb. plantation, we carried out pruning twice with a time interval of two years. The treatments included one unpruned treatment (CK) and five pruned treatments (from P1 to P5, representing the live branch height being kept at 68%, 55%, 60%, 55% and 45% of the tree height). CK, P1 and P2 were conducted in the first pruning in March 2019, and the remaining treatments were conducted in the second pruning in January 2021. The growth investigations were carried out in March 2019, December 2019, December 2020 and December 2021. Another investigation was carried out only for the measurement of live branch heights and crown widths in January 2021 just after the second pruning. The results showed that pruning resulted in a 15.08% to 60.62% increase in diameter growth and an 10.28% to 29.87% increase in volume growth. The stem form was also improved. Significant differences were recorded in live branch heights after green pruning but gradually recovered to the same level in two years by branch senescence. Pruning also resulted in a faster extension of the crown width with an enlarged growing space by the removal of green branches. We highlighted that trees with different growth statuses responded differently to pruning intensities: trees of weak growth statuses grew better under a light pruning intensity, while those with a strong growth status grew better under a severe pruning intensity. Overall, for the seven-year-old young mason pine plantation, keeping four rounds of branches in trees with diameters of less than 8 cm and keeping three rounds of branches in trees with diameters of more than 8 cm were appropriate measures. [ABSTRACT FROM AUTHOR]