引用本文:王月玲,周凤,张帆,马武功,王强,曹胜磊,耿增超,等.施用生物炭对土壤呼吸以及土壤有机碳组分的影响[J].环境科学研究,2017,30(6):920-928.
WANG Yueling,ZHOU Feng,ZHANG Fan,MA Wugong,WANG Qiang,CAO Shenglei,GENG Zengchao,et al.Influence of Biochar on Soil Respiration and Soil Organic Carbon Fractions[J].Reserrch of Environmental Science,2017,30(6):920-928.]
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施用生物炭对土壤呼吸以及土壤有机碳组分的影响
王月玲1, 周 凤1, 张 帆2, 马武功2, 王 强1, 曹胜磊1, 耿增超1
1.西北农林科技大学资源环境学院, 农业部西北植物营养与农业环境重点实验室, 陕西 杨凌 712100 ;2.陕西省宝鸡市辛家山林业局, 陕西 宝鸡 721700
摘要:
为确定生物炭对土壤呼吸速率以及土壤碳组分的影响,采用田间小区试验,以苹果果树枝条生物炭为试验材料,研究了添加0、20、40、60、80 t/hm2的苹果果树枝条生物炭后,小麦生态系统呼吸(Re)、土壤呼吸(Rs)、植物呼吸(Rp)、土壤TOC(总有机碳)、土壤POC(颗粒有机碳)、WSOC(土壤水溶性有机碳)和土壤AOC(易氧化有机碳)的变化以及各指标之间的相关性. 结果表明,添加生物炭显著提高了小麦生态系统呼吸速率、土壤呼吸速率和植物呼吸速率,与对照相比分别增加了9.98%~27.57%、9.33%~19.47%和10.18%~30.14%,并且生物炭施用量为20和40 t/hm2时土壤呼吸速率显著高于其他两个处理,而对于小麦生态系统呼吸速率和植物呼吸速率来说,施用40 t/hm2生物炭时其值最高. 对于土壤碳组分,施用生物炭显著提高了0~20 cm土层中土壤w(TOC)、w(POC)和w(AOC),并且土壤w(TOC)和w(POC)与生物炭施用量呈极显著正相关. 对于WSOC而言,当生物炭施用量高于40 t/hm2时其值显著降低,与对照相比,0~10、>10~20和>20~30 cm三个土层中w(WSOC)分别降低了21.82%~28.37%、35.88%~36.58%和32.28%~44.07%. 研究显示,适量施用生物炭能够提高土壤w(TOC)、w(POC)和w(AOC)而降低了w(WSOC),但同时也增加了小麦生态系统呼吸速率.
关键词:  生态系统呼吸  植物呼吸  土壤颗粒有机碳  土壤水溶性有机碳
DOI:
分类号:
基金项目:国家农业部“948”项目(2010-Z19);杨凌示范区科技计划项目(2015SF-03)
Influence of Biochar on Soil Respiration and Soil Organic Carbon Fractions
WANG Yueling1, ZHOU Feng1, ZHANG Fan2, MA Wugong2, WANG Qiang1, CAO Shenglei1, GENG Zengchao1
1.Key Laboratory of Plant Nutrition and Agri-Environment in Northwest China, Ministry of Agriculture, College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China ;2.Forestry Bureau of Xinjiashan, Baoji, Shaanxi, Baoji 721700, China
Abstract:
Abstract:Biochar addition to soil has been widely accepted as a soil conditioner to improve soil physical and biochemical properties, increase crop yields and enhance fertilizer use efficiency. However, there has always been a dispute about whether biochar inhibits soil respiration. Five levels of branches-derived biochar from apple tree (0,0, 40,0 and 80 t/hm2) were used. The effects of biochar on ecosystem respiration (Re), soil respiration (Rs), plant respiration (Rp), total soil organic carbon (TOC), soil particulate organic carbon (POC), soil active organic carbon (AOC) and water-soluble organic carbon (WSOC) were investigated in a plot trial. The results showed that, compared to the control treatment, ecosystem respiration, soil respiration and plant respiration were increased by 9.98%-27.57%, 9.33%-19.47% and 10.18%-30.14%, respectively. Soil respiration was higher at biochar levels of 20 and 40 t/hm2 than that in the biochar levels of 60 and 80 t/hm2, while ecosystem respiration and plant respiration reached the maximum at 40 t/hm2. Biochar amendment significantly increased the contents of TOC, POC and AOC in the 0-20 cm soil layer, and the contents of TOC and POC were positively correlated with the biochar dosage. The contents of WSOC significantly decreased at biochar levels of 60 and 80 t/hm2, and it decreased respectively by 21.82%-28.37%, 35.88%-36.58% and 32.28%-44.07% in 0-10, >10-20 and >20-30 cm soil layers compared to the control. The results indicated that as a long-term mechanism of carbon sequestration, biochar improved the total soil organic carbon. In addition, soil respiration could be improved by biochar amendment.
Key words:  ecosystem respiration  plant respiration  soil particulate organic carbon  water-soluble organic carbon