"9.5"泸定地震对土壤呼吸及团聚体有机质的影响
The IMPACT of the"9.5"Luding Earthquake on Soil Respiration and Aggregate Organic Matter
田钧灵 1李育 1代雨 1孙乙 1薛婧 1彭彬 2李勋 2张艳2
作者信息
- 1. 四川民族学院 横断山区生态修复与特色产业培育研究中心/川藏滇青林草抚育和利用研究中心 四川,甘孜 626001
- 2. 四川民族学院 横断山区生态修复与特色产业培育研究中心/川藏滇青林草抚育和利用研究中心 四川,甘孜 626001;四川民族学院 横断山区生态保护与特色产业培育研究四川省高校重点实验室 四川,甘孜 626001
- 折叠
摘要
本研究对泸定"9.5"地震造成的山体滑坡区域和附近未滑坡区域进行呼吸速率的测定,并进行取样实验,采用干筛法和湿筛法分别对土壤团聚体进行分离,并对各级团聚体进行分析比较,研究地震对土壤呼吸及团聚体有机质含量的影响.结果表明:(1)滑坡林地的土壤呼吸速率显著高于未滑坡林地,说明地震会增强土壤呼吸速率,提高土壤中CO2与大气的交换速率.(2)地震对同一粒径下滑坡与未滑坡团聚体含量无显著影响,但会增加粒径为>10 mm、5～1 mm、<0.25 mm的力稳性团聚体含量及粒径为>2 mm、<0.25 mm的水稳性团聚体含量,其中<0.25 mm的团聚体含量增加最多.(3)未滑坡林地土壤力稳性团聚体有机质含量在7.18%～10.58%的范围之间,水稳性团聚体有机质含量在8.01%～13.92%的范围之间,滑坡林地土壤力稳性团聚体有机质含量在3.03%～5.72%的范围之间,而水稳性团聚体有机质含量则在2.97%～4.25%之间.地震对各级团聚体的有机质含量无显著影响,但地震引起的山体滑坡会减少团聚体内的有机质含量,特别是对粒径为0.25～0.5 mm的团聚体有机质含量减少最多.综上,地震引起的山体滑坡会增强土壤呼吸速率,增加小颗粒团聚体占比,而减少各级团聚体有机质含量.
Abstract
The respiratory rate of landslide areas and nearby non landslide areas caused by the"9.5"earthquake in Luding was measured,and sampling experiments were conducted.Dry and wet sieving methods were used to separate soil aggregates,and various levels of aggregates were analyzed and compared to study the impact of earthquakes on soil respiration and organic matter content of aggregates.The results indicate that:(1)the soil respiration rate in landslide forested areas is significantly higher than that in non landslide forested areas,indicating that earthquakes can enhance soil respiration rate and increase the exchange rate of CO2 between the soil and the atmosphere.(2)Earthquakes have no significant effect on the content of landslide and non landslide aggregates under the same particle size,but they increase the content of force stable aggregates with particle sizes>10 mm,5～1 mm,and<0.25 mm,as well as the content of water stable aggregates with particle sizes>2 mm and<0.25 mm.Among them,the content of aggregates with particle sizes<0.25 mm increases the most.(3)The organic matter content of soil stable aggregates in non landslide forest land ranges from 7.18%to 10.58%,the organic matter content of water stable aggregates ranges from 8.01%to 13.92%,the organic matter content of soil stable aggregates in landslide forest land ranges from 3.03%to 5.72%,and the organic matter content of water stable aggregates ranges from 2.97%to 4.25%.Earthquakes have no significant impact on the organic matter content of aggregates at all levels,but landslides caused by earthquakes can reduce the organic matter content in aggregates,especially for aggregates with particle sizes ranging from 0.25 to 0.5mm.In summary,landslides caused by earthquakes can enhance soil respiration rate,increase the proportion of small particle aggregates,and reduce the organic matter content of aggregates at all levels.
关键词
地震/土壤呼吸/团聚体/有机质Key words
earthquake/soil respiration/aggregates/organic matter引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据