模拟氮沉降对云冷杉红松林土壤呼吸的影响

刘博奇; 牟长城; 邢亚娟; 王庆贵

模拟氮沉降对云冷杉红松林土壤呼吸的影响

1.
东北林业大学生态研究中心, 黑龙江哈尔滨 150026
2.
黑龙江大学农业资源与环境学院, 黑龙江哈尔滨 150080
基金项目:
国家自然科学基金:气候变化背景下小兴安岭老龄阔叶红松林土壤碳汇变化机理(31070409);国家自然科学基金:气候变化背景下黑龙江东部山区谷地云冷杉林的衰退机理(30970487);国家自然科学基金:小兴安岭阔叶红松林生态系统对 N 沉降增加的响应(31170421)
中图分类号: S714

Effects of Simulated Nitrogen Deposition on Soil Respiration in Spruce-fir-Korean Pine Forest of Xiaoxing’anling Mountains in China

1.
Ecological Research Centre, Northeast Forestry University, Harbin 150026, Heilongjiang, China
2.
College of Agricultural Resource and Environment, Heilongjiang University, Harbin 150080, Heilongjiang, China
CLC number: S714

摘要: 2011年5月至2011年10月在黑龙江省小兴安岭云冷杉红松林内进行模拟氮沉降试验,使用便携式土壤CO2通量观测仪LI-8100测定不同氮沉降浓度CK(0)、TL(50 kg·hm-2·a-1)、TM (100 kg·hm-2·a-1)和TH (150 kg·hm-2·a-1)对土壤呼吸的影响。结果表明,氮沉降未显著改变土壤呼吸的日变化和季节性变化规律;对比CK,TL、TM和TH处理,分别使土壤日呼吸速率提高了13.72%、23.22%和5.12%,年呼吸速率提高了13.98%、18.26%和1.12%;土壤呼吸与温度呈极显著的指数相关(PL、TM和TH处理下,土壤呼吸温度敏感系数Q10分别为4.77、5.71、6.62和5.49,氮沉降处理提高了小兴安岭云冷杉红松林的土壤呼吸速率和温度敏感性。
- 氮沉降
- / 土壤呼吸
- / Q₁₀值
- / 云冷杉红松林
Abstract: In order to investigate the effects of simulated nitrogen deposition on soil respiration in spruce-fir-Korean pine forests, a simulated nitrogen deposition experiment was conducted in Xiaoxing’anling Mountains area in Heilongjiang Province from May to October, 2011. The experiment included the Control (0, CK ), low-N (50 kg·hm-2·a-1, TL), medial-N (100 kg·hm-2·a-1, TM) and high-N (150 kg·hm-2·a-1, TH) treatment level. The results showed that the nitrogen deposition did not change the daily and seasonal variation patterns of soil respiration. Compared to Control,the TL, TM, and TH treatments increased the soil daily average respiration rates by 13.72%, 23.22% and 5.12%, and 13.98%, 18.26% and 1.12% for soil annul average respiration rates. Significant exponential relationship was found between soil respiration rate and soil temperature, but no significant relationship was found between the soil moisture and soil respiration rates. The Q10(the respiratory flux at one temperature over the flux at a temperature 10℃ lower) were 4.77, 5.71, 6.62 and 5.49 for soil respiration of the CK, TL, TM, and TH treatments respectively. The findings suggested that nitrogen deposition could promote soil respiration, and increase soil respiration temperature sensitivity in spruce-fir-Korean pine forests.
- nitrogen deposition
- / soil respiration
- / Q₁₀ value
- / spruce-fir-Korean pine forest

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模拟氮沉降对云冷杉红松林土壤呼吸的影响

Effects of Simulated Nitrogen Deposition on Soil Respiration in Spruce-fir-Korean Pine Forest of Xiaoxing’anling Mountains in China

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模拟氮沉降对云冷杉红松林土壤呼吸的影响

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Effects of Simulated Nitrogen Deposition on Soil Respiration in Spruce-fir-Korean Pine Forest of Xiaoxing’anling Mountains in China

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模拟氮沉降对云冷杉红松林土壤呼吸的影响

Effects of Simulated Nitrogen Deposition on Soil Respiration in Spruce-fir-Korean Pine Forest of Xiaoxing’anling Mountains in China

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模拟氮沉降对云冷杉红松林土壤呼吸的影响

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Effects of Simulated Nitrogen Deposition on Soil Respiration in Spruce-fir-Korean Pine Forest of Xiaoxing’anling Mountains in China

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