兴安落叶松人工林土壤碳密度分布特征研究

发布时间：2018-03-29 01:38

本文选题：大兴安岭　切入点：人工林　出处：《西北农林科技大学学报(自然科学版)》2017年06期

【摘要】：【目的】分析不同人工更新造林方式下兴安落叶松林土壤碳密度分布特征,为研究地区人工林生态系统碳汇管理及造林实践提供理论依据。【方法】2015年7-8月,以内蒙古大兴安岭林区不同人工更新造林方式(荒山荒地、水湿地、火烧迹地)和林龄(幼龄林、中龄林)的兴安落叶松林人工林为研究对象,通过野外调查与室内分析相结合的方法,对兴安落叶松幼龄林和中龄林0~40cm土层土壤有机碳、碳密度以及分布特征进行比较研究。【结果】不同人工更新造林方式下,幼龄林和中龄林落叶松各土层土壤有机碳含量分别为26.84~105.42,30.26~101.81g/kg,土壤有机碳主要集中在0~20cm土层,其所占比例在63%以上,均随着土层的加深而降低;幼龄林和中龄林落叶松各土层土壤碳密度分别为23.80~106.98,34.84~89.48t/hm~2,也随着土层的加深而降低,0~20cm土层碳密度占土壤总碳密度的60%以上,呈现表层聚集现象。幼龄林不同人工更新造林方式土壤总碳密度(0~40cm土层)分别为火烧迹地(258.98t/hm~2)荒山荒地(249.24t/hm~2)水湿地(238.12t/hm~2),中龄林不同人工更新造林方式土壤总碳密度分别为荒山荒地(263.92t/hm~2)火烧迹地(253.83t/hm~2)水湿地(249.44t/hm~2),且不同更新造林方式之间差异均显著。【结论】不同人工更新造林方式下,兴安落叶松人工林土壤有机碳含量及碳密度存在明显差异,在未来研究区造林实践中,建议选择火烧迹地、荒山荒地造林,对于水湿地应以保护和保护性利用为主,并且减少人类活动对森林表层土壤的干扰和破环。
[Abstract]:[objective] to analyze the distribution characteristics of soil carbon density in Larix gmelinii forest under different reforestation methods, and to provide a theoretical basis for carbon sink management and afforestation practice of plantation ecosystem in the study area. [methods] July-August 2015, Different artificial reforestation methods (barren mountain wasteland, water wetland, burning land) and forest age (young forest, middle age forest) in Daxingan Mountains, Inner Mongolia, were used to study the artificial reforestation of Larix gmelinii forest. Through field investigation and indoor analysis, soil organic carbon, carbon density and distribution characteristics of 0~40cm soil layer in young and middle age larch forests of Xingan were compared. [results] under different reforestation methods, soil organic carbon, carbon density and distribution characteristics of soil layer in young and middle age larch forests were compared. The soil organic carbon content of larch in young and middle aged stands was 26.84 ~ 105.4230.26 ~ 101.81 g / kg, respectively. Soil organic carbon was mainly concentrated in 0~20cm soil layer, and its proportion was more than 63%, all of which decreased with the deepening of soil layer. The soil carbon density of larch in young and middle aged stands was 23.80 ~ 106.98 ~ 34.84 ~ 89.48 t / hm ~ (-2), and the soil carbon density of 20 cm soil layer was more than 60% of the total soil carbon density with the deepening of soil layer. The soil total carbon density of different artificial reforestation ways of young forest is 0 ~ 40 cm soil layer) the burning land is 258.98 t / hm ~ (2)) waste land is 249.24 t / hm ~ (2) water wetland is 238.12 t ~ (-1) 路hm ~ (2) ~ (2), and the soil total carbon density of different artificial reforestation method in middle age forest is respectively. For the barren mountain wasteland (263.92 t / hm ~ (2)) burning land (253.83 t / hm ~ (2)) water wetland (249.44 t / hm ~ (2)), there are significant differences among different reforestation methods. [conclusion] under different artificial reforestation methods, The soil organic carbon content and carbon density of Larix gmelinii plantation are obviously different. In the future afforestation practice in the research area, it is suggested to select the burning land and barren mountain wasteland for afforestation, and to protect and protect the water wetland. And reduce human activities to the forest surface soil disturbance and destruction.
【作者单位】：内蒙古农业大学草原与资源环境学院;内蒙古赛罕乌拉森林生态系统国家定位观测研究站;内蒙古毕拉河国家级自然保护区管理局;
【基金】：国家自然科学基金项目“火烧木管理对寒温带森林火灾后冻土释放二氧化碳的影响研究”(41563006) 内蒙古自治区科技计划项目“大兴安岭森林火灾后生态监测与评价技术研究”(20130435)
【分类号】：S714.2

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