Effect of strip shelterwood-cuts on the crown morphology plasticity of natural regenerated<i>Pinus tabuliformis</i>saplings in northeastern China

Gao, Huilin; Feng, Jian; Yin, You; Hu, Wanjin; Yang, Qing; Liu, Mingguo

doi:10.7717/peerj.9826

Cited by 1 publication

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“…The Pinus tabuliformis plantations in the Liaoning Province in northeastern China cover an area of ~0.14 million hectares. Mature Pinus tabuliformis plantations account for approximate 65% of the total area covered by this tree species ( Gao et al, 2020 ). Following the study of Gao et al (2020) , the aims of this study were to (1) compare the effects of clear-cut and uncut strips on the sapling height growth for the current year, length and number of branches for the first whorl, (2) compare the effects of clear-cut and uncut strips on the photosynthetic capacities of the leaves of saplings; and (3) evaluate the effects of clear-cut strips on the biological diversity and water content of decomposition and semi-decomposition layer.…”

Section: Introductionmentioning

confidence: 99%

Effect of strip clear-cutting on the natural regeneration of Pinus tabuliformis plantations in northeastern China

Sun

Feng

Gao

et al. 2022

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In this study, the effect of strip clear-cutting on the natural regeneration performance of mature Pinus tabuliformis plantations in the three locations in western part of the Liaoning Province was analyzed. Strip clear-cutting, with clear-cut and uncut strip widths of 15, 20, 25 m, and 10 and 18 m, respectively, was conducted in spring 2014, and control, in each study location. Field investigations were conducted in 2017. Fifteen sample plots with sizes of 4 m2 (2 m × 2 m) were established in each clear-cut strip, uncut strip, and control. One to four saplings were randomly selected to measure the current year increment, and the lengths and numbers for branch of the first whorl. Three saplings were randomly selected from the center of the strip to measure the photosynthetic rate. Three sample plots with sizes of 4 m2 (2 m × 2 m) and 1 m2 (1 m × 1 m) were developed in each strip and control to determine the biodiversity of shrubs and herbs as well as the water content of the decomposition and semi-decomposition layer. The results show that the current year increment and branch length of the first whorl can be ordered as follows: clear-cut strips > control > uncut strips. Number of the branches of the first whorl can be ordered as follows: clear-cut strips > uncut strips > control. Strip clear-cutting was a statistically significant treatment for the current year increment and length and number of branches of the first whorl. The saplings from the clear-cut strip with a width of 25 m have the largest photosynthetic capacity compared with those from the other strips and control. The transpiration rates of the large, medium, and small saplings from clear-cut strips are the largest and those of saplings from the control are the smallest. The water content of the decomposition and semi-decomposition layer in the control is the highest, but no significant difference was confirmed between the strip clear-cutting approaches.

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Section: Introductionmentioning

confidence: 99%