干湿交替对城市绿地土壤CO_2排放的影响
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摘要
为了解在干湿交替的影响下城市绿地土壤CO_2排放的动态特征,以海珠湖公园绿地土壤为研究对象,应用人工气候箱内培养,并定期取样监测土壤CO_2排放速率。研究表明,干旱土壤增湿后,土壤CO_2排放速率有短暂激发,土壤CO_2排放速率在12 h达到最大值,为增湿前的3.8~10.8倍;随干湿交替进行,激发效应快速衰减,对土壤CO_2排放而言,4天循环周期(4DW)处理的比经12天循环周期(12DW)处理的衰减速度快,另外,4DW中各周期内平均排放速率下降,而12DW条件下,并无此现象;经干湿交替处理的土壤,其CO_2累积排放量均显著低于对照组(恒湿,CK),CO_2排放量,仅为其对应的对照组的33%~46%,处理组之间并无显著差异。
In order to understand the dynamic characteristics of CO_2 emissions from urban green space under the influence of drying-wetting alternation, the soil of Haizhu Lake Park was taken as the research object. Artificial climate chamber was used to culture and the soil CO_2 emission rate was monitored periodically. The study showed that the CO_2 emission rate of the soil was stimulated for a short time after the soil was humidified, and the soil CO_2 emission rate reached its maximum at 12 h, which was 3.8~10.8 times of the pre-humidification rate; For CO_2 emissions, the 4-day cycle(4 DW) process has a faster decay rate than the 12-day cycle(12 DW). In addition, the average emission rate in each cycle of the 4 DW decreases, but in the 12 DW condition, there is no such phenomenon. The cumulative CO_2 emission of soils treated alternately with dry and wet soil was significantly lower than that of the control(humidity, CK) and CO_2 emissions, which was only 33 %~46 % of their corresponding control groups. No significant difference.
In order to understand the dynamic characteristics of CO_2 emissions from urban green space under the influence of drying-wetting alternation, the soil of Haizhu Lake Park was taken as the research object. Artificial climate chamber was used to culture and the soil CO_2 emission rate was monitored periodically. The study showed that the CO_2 emission rate of the soil was stimulated for a short time after the soil was humidified, and the soil CO_2 emission rate reached its maximum at 12 h, which was 3.8~10.8 times of the pre-humidification rate; For CO_2 emissions, the 4-day cycle(4 DW) process has a faster decay rate than the 12-day cycle(12 DW). In addition, the average emission rate in each cycle of the 4 DW decreases, but in the 12 DW condition, there is no such phenomenon. The cumulative CO_2 emission of soils treated alternately with dry and wet soil was significantly lower than that of the control(humidity, CK) and CO_2 emissions, which was only 33 %~46 % of their corresponding control groups. No significant difference.
引文
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[12]Harrison-Kirk T,Beare M H,Meenken E D,et al.Soil organic matter and texture affect responses to dry/wet cycles:Changes in soil organic matter fractions and relationships with C and N mineralisation[J].SOIL BIOL BIOCHEM,2014,74:50-60.
[13]Shi A,Yan N,Marschner P.Cumulative respiration in two drying and rewetting cycles depends on the number and distribution of moist days[J].GEODERMA,2015,s243-244:168-174.
[2]Lebedjantzev,A.N.Drying of soil,as one of the natural factors in maintaining soil fertility[J].SOIL SCI,1924,18(6):419-448.
[3]Wan Y J,Ju X T,Ingwersen J,et al.Gross Nitrogen Transformations and Related Nitrous Oxide Emissions in an Intensively Used Calcareous Soil[J].SOIL SCI SOC AM J,2009,73(1):102-112.
[4]Iqbal J,Hu R,Lin S,Ahamadou B,Feng M.Carbon dioxide emissions from Ultisol under different land uses in mid-subtropical China[J].GEODERMA,2009,152(1-2):63-73.
[5]Fierer N.A Proposed Mechanism for the Pulse in Carbon Dioxide Production Commonly Observed Following the Rapid Rewetting of a Dry Soil[J].SOIL SCI SOC AM J,2003,67(3):798-805.
[6]Saetre P,Stark J M.Microbial dynamics and carbon and nitrogen cycling following re-wetting of soils beneath two semi-arid plant species[J].OECOLOGIA,2005,142(2):247-260.
[7]Ruser R,Flessa H,Russow R,Schmidt G,Buegger F,Munch J C.Emission of N2O,N2 and CO2 from soil fertilized with nitrate:effect of compaction,soil moisture and rewetting[J].Soil Biology and Biochemistry,2006,38(2):263-274.
[8]Denef K,Six J,Bossuyt H,et al.Influence of dry-wet cycles on the interrelationship between aggregate,particulate organic matter,and microbial community dynamics[J].SOIL BIOL BIOCHEM,2001,33(12):1599-1611.
[9]R F Harris.Effect of Water Potential on Microbial Growth and Activity[D].Water Potential Relations in Soil Microbiology,1981.
[10]Roberson E B,Firestone M K.Relationship between Desiccation and Exopolysaccharide Production in a Soil Pseudomonas sp[J].Applied&Environmental Microbiology,1992,58(4):1284-1291.
[11]赵蓉,李小军,赵洋,等.固沙植被区两类结皮斑块土壤呼吸对不同频率干湿交替的响应[J].生态学杂志,2015(01):138-144.
[12]Harrison-Kirk T,Beare M H,Meenken E D,et al.Soil organic matter and texture affect responses to dry/wet cycles:Changes in soil organic matter fractions and relationships with C and N mineralisation[J].SOIL BIOL BIOCHEM,2014,74:50-60.
[13]Shi A,Yan N,Marschner P.Cumulative respiration in two drying and rewetting cycles depends on the number and distribution of moist days[J].GEODERMA,2015,s243-244:168-174.