Shi L, Wang X R, Shi Y H, et al. Effects of Tending and Management on Water Retention Characteristics of Litter Layers in Different Types of Pinus Massoniana Forest Within the Three Gorges Reservoir Area[J]. Journal of Southwest Forestry University, 2025, 45(2): 115–121. DOI: 10.11929/j.swfu.202403041
Citation: Shi L, Wang X R, Shi Y H, et al. Effects of Tending and Management on Water Retention Characteristics of Litter Layers in Different Types of Pinus Massoniana Forest Within the Three Gorges Reservoir Area[J]. Journal of Southwest Forestry University, 2025, 45(2): 115–121. DOI: 10.11929/j.swfu.202403041

Effects of Tending and Management on Water Retention Characteristics of Litter Layers in Different Types of Pinus Massoniana Forest Within the Three Gorges Reservoir Area

  • Taking different types of ponytail pine forests in the Three Gorges Reservoir area as the research object, and taking into account the differences in species composition and nursery management, 4 stand types of nurtured Pinus massoniana + Cunninghamia lanceolata mixed forest(Ⅰ), nurtured P. massoniana + Camellia oleifera mixed forest(Ⅱ), unmanaged P. massoniana pure forest(Ⅲ) and unmanaged P. massoniana + C.lanceolata mixed forest(Ⅳ) were selected as the research subjects by field investigation and indoor soaking method, the water-holding characteristics and water-holding capacity of litter layers of the different stand types were compared and analyzed. The results showed that the variation of litter storage in the 4 types of P. massoniana forest stands ranged from 16.45 to 24.67 t/hm2, and the litter storage was in the order of Ⅳ > Ⅱ > Ⅲ > Ⅰ, and the storage in the semi-decomposed layer of litter was higher than the storage in the undecomposed layer. The maximum water-holding capacity of litter varied from 48.59 to 85.18 t/hm2, and the maximum water-holding rate varied from 301.68% to 360.08%. The effective storage capacity of litter varied from 31.49 to 52.18 t/hm2, and the effective storage rate varied from 173.74% to 227.77%. The effective storage capacity showed the order of Ⅱ > Ⅳ > Ⅲ > Ⅰ from large to small, and the effective storage rate of litter was ranked as Ⅱ > Ⅰ > Ⅳ > Ⅲ. Except for unmanaged P. massoniana + C.lanceolata mixed forest, the maximum water retention rate and effective storage rate of litter in the semi-decomposed layer were higher than those in the non-decomposed layer. The water holding capacity of dead wood was logarithmically related to the soaking time: W = alnt + b, and the water absorption rate was power-functional to the soaking time: V = atb. In conclusion, among the 4 types of P. massoniana forest, the care-type nurtured P. massoniana + Camellia oleifera mixed forest has the best water retention effect in litter layer, and the P. massoniana needle-width mixed forests with strengthened nursery management could play the function of the deadfall layer in water conservation more effectively.
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