抚育对林地土壤碳释放的影响——基于Yasso07估算

发布时间：2018-07-22 16:10

【摘要】：间伐是森林经营的有效措施之一,其能减少林木枯损,有利于林下植被生长和植物种群更新,但也可改变森林小气候,从而影响林地土壤碳释放。以秦岭火地塘林区松栎混交林为研究对象,运用Yasso07模型模拟了不同间伐强度和间伐残留物移除强度下林地土壤CO_2释放。结果表明:(1)针叶树种(油松Pinus tabulaefomis、华山松Pinus armandi)和阔叶树种(锐齿栎Quercus aliena var.acutesrrata)叶凋落物化学组分有较明显差异,针叶树种酒精溶解性化合物(ESC)和水溶性化合物(WSC)含量明显低于阔叶树种,其不溶性化合物(NSC)含量明显高于阔叶树种;(2)凋落物化学组分对林地土壤CO_2释放有显著的影响;(3)在研究两个控制因子中,间伐强度是影响林地土壤CO_2释放的主导因子,间伐后林地土壤CO_2释放量有升高趋势;当间伐强度为12.38%,间伐残留物移除强度为53.18%时,林地土壤CO_2释放量最小,为15.318 Mg hm~(-2)a~(-1)。
[Abstract]:Thinning is one of the effective measures for forest management, which can reduce the loss of forest trees, help the growth of vegetation and the regeneration of plant population under forest, but also change the microclimate of forest, thus affecting the carbon release of forest soil. Using the Yasso07 model, the release of soil CO2 from forest land under different thinning intensity and removal intensity of thinning residue was simulated by using the mixed forest of Pinus and Quercus in Huoditang forest area of Qinling Mountains. The results showed that: (1) the chemical components of leaf litter of coniferous tree species (Pinus tabulaefomis, Pinus armandi) and broad-leaved species (Quercus aliena var.acutesrrata) were significantly different. The contents of alcohol soluble compounds (ESC) and water-soluble compounds (WSC) in coniferous trees were significantly lower than those in broadleaved trees. The content of insoluble compounds (NSC) was significantly higher than that of broad-leaved species, (2) the chemical components of litter had a significant effect on CO2 release from forestland soil, (3) among the two control factors, thinning intensity was the dominant factor affecting CO2 release from forestland soil. When the intensity of thinning was 12.38 and the removal intensity of residue of thinning was 53.18, the release of CO2 from forest soil was the lowest, which was 15.318 mg hm ~ (-2) a ~ (-1).
【作者单位】：西北农林科技大学林学院;教育部西部生态与环境修复重点实验室;西北农林科技大学资源环境学院;
【基金】：国家林业公益性行业科研专项(201304307)
【分类号】：S714

【相似文献】