LIU Xiaoju,PAN Cunde,CHU Jiangtao,et al.Response of Aboveground Carbon Density of Herbaceous Layer to Post-Fire Time of Fire Severity in Kanas, Xinjiang[J].Research of Soil and Water Conservation,2022,29(03):98-105.
喀纳斯泰加林林下草本层地上碳密度对林火烈度的火后时间响应
- Title:
- Response of Aboveground Carbon Density of Herbaceous Layer to Post-Fire Time of Fire Severity in Kanas, Xinjiang
- 文章编号:
- 1005-3409(2022)03-0098-08
- Keywords:
- Kanas; herb; functional group; carbon density; fire severity; post-fire time
- 分类号:
- S762; X17
- 文献标志码:
- A
- 摘要:
- 为了探究林火烈度和火后时间对喀纳斯泰加林林下草本层碳密度的影响,在喀纳斯自然保护区设置火干扰样地,采用收获法进行了生物量调查。分莎草科、禾本科、豆科和其他草类4个功能群进行草本地上碳密度对林火烈度的火后时间响应研究。结果表明:喀纳斯林泰加林草本层地上碳密度的范围为0.096～0.359 t/hm2。在3个演替阶段,莎草科和禾本科对草本层地上碳密度贡献率大; 其他草类对草本层地上碳密度贡献率的范围为10.03%～40.97%; 豆科对草本层地上碳密度贡献率最小,仅在针叶阔叶林阶段中低烈度火后51～84 a的林分中其贡献率较大。喀纳斯林草生态系统大部分林分处于针叶阔叶和针叶混交林阶段,草本层地上碳密度在不同烈度的火干扰下总体趋势为:低烈度>中烈度>高烈度,表明低烈度火干扰有利于草本植物的生长。3个演替阶段草本功能群地上碳密度对林火烈度的火后时间响应并不相同,但草本层地上碳密度随着火后时间的增加总体呈减小趋势。高烈度火干扰对草本层地上碳密度的影响最大,且不利于保持或提高森林的生产力。通过清除林下凋落物将林火烈度控制在中、低烈度范围内,有利于提高草本层的碳汇功能。
- Abstract:
- In order to explore the effects of fire severity and post-fire time on carbon density of herbaceous layer in Taiga forest of Kanas, fire disturbance plots were set up in Kanas Nature Reserve, and herb biomass was investigated by harvest method. The response of herbaceous aboveground carbon density to fire severity was studied in four functional groups: Cyperaceae, Gramineae, Leguminosae and weeds. The results showed that the aboveground carbon density ranged from 0.096 t/hm2 to 0.359 t/hm2. In the three successional stages, Cyperaceae and Gramineae contributed more to the aboveground carbon density of the herbaceous layer; weeds contributed 10.03%～40.97% to the aboveground carbon density of the herbaceous layer; Leguminosae contributed the least to the aboveground carbon density of the herbaceous layer, and they contributed more only in the coniferous and broad-leaved forest stage after 51～84 years of low severity fire. Most of the stands in Kanas Taiga were in the stage of coniferous broad-leaved and coniferous mixed forest. The overall trend of aboveground carbon density in herbaceous layer under different fire severity decreased in the order: low severity>moderate severity>high severity, which indicated that low severity was conducive to the growth of herbs. The response of aboveground carbon density of herb functional groups to fire severity in three successional stages was not the same, but the overall trend of the aboveground carbon density of herbaceous layer decrease with increasement of the time after fire. High severity had the greatest impact on aboveground carbon density in herbaceous layer, and was not conducive to maintaining or improving forest productivity. By removing litter under the forest, the fire severity should be controlled in the range of moderate and low severity, which is conducive to improving the carbon sink function of herbaceous layer.
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备注/Memo
收稿日期:2021-04-14 修回日期:2021-05-04
资助项目:新疆自然科学基金面上项目“喀纳斯泰加林火烧迹地林下植被生物量动态及碳、氮、磷化学计量特征研究”(2019D01A67)); 新疆农业职业技术学院科研资助项目“阿尔泰山柳兰资源的调查、评价与引种”(XJNZYKJ202012)
第一作者:刘小菊(1979—),女,四川南部人,教授,博士,主要从事林草生态、园林植物栽培方面的教学和科研工作。E-mail:liuxiaoju317@163.com