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间伐对华山松人工林林木生长及土壤持水性能的短期影响

Short-term Effects of Thinning Intensity on Stand Growth and Soil Physical Properties of Huashan Pine Plantations

  • 摘要: 以川西南10年生华山松人工林为研究对象,设置间伐保留量1800株//hm2(轻度间伐,LT)、1350株//hm2(中度间伐,MT)和900株//hm2(重度间伐,HT)、对照(不间伐,CK)等4种处理方式,间伐3年后对华山松林木生长和土壤持水性能进行调查分析。结果表明:(1)间伐促进了华山松林木的生长,间伐3后所有间伐样地的林木胸径和株高均显著高于对照(P<0.05),不同间伐强度间无显著差异,但重度间伐的生长量变化最大;(2)间伐对林分水土保持有明显改善作用,间伐后样地土壤容重降低,总孔隙度、毛管孔隙度和持水量增加,且重度间伐效果最为显著(P<0.05)。研究表明,间伐可有效促进林木生长和改善土壤结构,提升土壤水源涵养能力,且重度间伐(900株/hm2)的提升效果最明显。

     

    Abstract: This study aimed to explore the short-term effects of different thinning intensities on soil physical properties and tree growth in Huashan pine plantations, providing a theoretical basis for the scientific management of Huashan pine plantations. The research was conducted in Huashan pine plantations in Huidong County, Liangshan Prefecture, Sichuan Province. Three thinning treatments were set up: light thinning (1800 trees/ha), moderate thinning (1350 trees/ha), and heavy thinning (900 trees/ha), with an unthinned control group for comparison. Through three years of experimental treatment, soil physical properties and tree growth indicators were investigated and analyzed. The results showed that: (1) Thinning significantly improved soil physical properties, with soil bulk density decreasing and total porosity, capillary porosity, and water holding capacity increasing, and the effect of heavy thinning was the most significant (P < 0.05). (2) After thinning, both diameter at breast height and tree height significantly increased (P < 0.05), but there was no significant difference in growth among different thinning intensities. The study indicates that thinning can optimize soil structure and promote tree growth, and heavy thinning (900 trees/ha) has the best effect on the growth of Huashan pine plantations and soil improvement.

     

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