Sun Yubo, Ou Xiaobin, Chen Kelin, et al. Evaluation of Water Conservation Function of Litters of Pinus Tabuliformis Forest in Ziwuling Forest Region of Loess Plateau[J]. Bulletin of Soiland Water Conservation, 2022, 42(3): 8-15.
DOI:
Sun Yubo, Ou Xiaobin, Chen Kelin, et al. Evaluation of Water Conservation Function of Litters of Pinus Tabuliformis Forest in Ziwuling Forest Region of Loess Plateau[J]. Bulletin of Soiland Water Conservation, 2022, 42(3): 8-15. DOI: 10.13961/j.cnki.stbctb.2022.03.002.
Evaluation of Water Conservation Function of Litters of Pinus Tabuliformis Forest in Ziwuling Forest Region of Loess Plateau
[Objective] The water conservation function of litters of artificial Pinus tabuliformis forests in the Ziwuling forest region of the Loess Plateau was determined in order to provide a theoretical basis for function-oriented stand improvement.[Methods] In August 2021
artificial Pinus tabuliformis forests with six stand densities (2 222
3 200
4 802
6 250
7 503
9 286 plants/hm2) were selected in the Lianjiabian Forest Farm in Ziwuling
Heshui County
Gansu Province. The coordinate comprehensive evaluation method was used to evaluate the water conservation function of P. tabuliformis forests.[Results] ① The thickness and volume of litters ranged from 2.78 to 7.30 cm and from 14.97 to 52.41 t/hm2
respectively. With the increase of stand density
the thickness and volume of litters showed a "single peak" change
with the peak appeared at 4 802 plants/hm2. ② The maximum water-holding rate (192.98%) and effective interception rate (152.04%) of litter for the 3 200 plants/hm2 stand were higher
while the maximum water-holding capacity (101.46 t/hm2) and effective interception amount (67.92 t/hm2) of litter for the 4 802 plants/hm2 stand were excellent. The semi-decomposed layer played a major role in the precipitation interception process of litters. ③ The water-holding rate/amount
water absorption rate
and soaking time of litters showed logarithmic responses (R2>0.956
0.962) and a power function response (R2>0.998)
respectively. ④ The water conservation function of litters was better when the density of the P. tabuliformis forest was 4 802 plants/hm2.[Conclusion] When only considering the water conservation function of litters of an artificial P. tabuliformis forest
the density of the forest should be 4 800 plants/hm2. In the future
research on the canopy and soil layer of the P. tabuliformis forest should be strengthened. The soil moisture vegetation bearing capacity and the water utilization law of the forest should be comprehensively considered to determine the stand density of the forest that provides the best water conservation function.
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