黄土丘陵沟壑区机修梯田与坡地土壤呼吸特征研究
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摘要
利用LI-8100开路式土壤呼吸仪对陇西县现有梯田和自然坡耕地温室气体CO2通量进行观测。结果表明,土壤温度,梯田低于坡地1℃左右,土壤呼吸速率,梯田低于坡地0.67μmol·m-2·s-1,土壤呼吸速率存在明显差异(P=0.00)。土壤水分在温度最高时,梯田土壤含有较高的体积含水量达0.224%,而坡地处在较低的0.153%,差值为0.071%。土壤呼吸速率在单因子模型下拟合程度不高(R2=0.1~0.5),但是双因子模拟下R2达到0.9以上,表明该区土壤呼吸速率受到这2个因子的共同影响;梯田的土壤呼吸特征更适应于黄土丘陵沟壑区的气候变化。
In this paper,the greenhouse gas CO2 flux of open terrace and natural slope in Longxi country by Li-8100 A automated soil CO2 flux system were studied. The results showed that the soil temperature of terraced field was 1 ℃ below slope land at the same time,the soil respiration rate was 0. 67 μmol·m- 2·s- 1below slope,and the soil respiration rates had a obvious difference( P = 0. 00). When the soil water was in the highest temperature,the terraced field soil contained 0. 224 % higher volumetric water,while the slope land was 0. 153 %,and the difference was 0. 071 %. Under single factor analysis model,the soli respiration rate's fitting degree was not high( R2= 0. 1- 0. 5),but under the double factor analysis,R2 over 0. 9. The result indicated that the soil respiration rate was the mutual effects of two factors; The characteristics of soil respiration on terraced was more adaptable to the change of climate on loess hilly and gully region.
In this paper,the greenhouse gas CO2 flux of open terrace and natural slope in Longxi country by Li-8100 A automated soil CO2 flux system were studied. The results showed that the soil temperature of terraced field was 1 ℃ below slope land at the same time,the soil respiration rate was 0. 67 μmol·m- 2·s- 1below slope,and the soil respiration rates had a obvious difference( P = 0. 00). When the soil water was in the highest temperature,the terraced field soil contained 0. 224 % higher volumetric water,while the slope land was 0. 153 %,and the difference was 0. 071 %. Under single factor analysis model,the soli respiration rate's fitting degree was not high( R2= 0. 1- 0. 5),but under the double factor analysis,R2 over 0. 9. The result indicated that the soil respiration rate was the mutual effects of two factors; The characteristics of soil respiration on terraced was more adaptable to the change of climate on loess hilly and gully region.
引文
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[14]Howard D M,Howard P.Relationships between CO2evolution,moisture content and temperature for a range of soil types[J].Soil Biology and Biochemistry,1993,25:1537.
[15]张剑锋.不同经营类型杉木人工林土壤呼吸率及影响因素研究[D].长沙:中南林业科技大学,2007.
[16]黄承才,葛滢.中亚热带东部三种主要木本群落土壤呼吸的研究[J].生态学报,1999,19(3):324-328.
[17]Xu M,Qi Y.Spatial and seasonal variations of Q 10 determined by soil respiration measurements at a Sierra Nevadan forest[J].Global Biogeochemical Cycles,2001,15(3):687-696.
[18]Mielnick P C,Dugas W A.Soil CO2flux in a tall grass Prairie[J].Soil Biology and Biochemistry,2000,32(2):221-228.
[19]杨晶,黄建辉,詹学明,等.农牧交错区不同植物群落土壤呼吸的日动态观测与测定方法比较[J].植物生态学报,2004,28(3):318-325.
[2]Singh J S,Gupta S R.Plant decomposition and soil respiration in terrestrial ecosystems[J].The Botanical Review,1977,43(4):449-528.
[3]齐志勇,王宏燕,王江丽,等.陆地生态系统土壤呼吸的研究进展[J].农业系统科学与综合研究,2003,19(2):116-119.
[4]姜丽芬,曲来叶,周玉梅,等.土壤呼吸与环境[Z].北京:高等教育出版社,2007.
[5]米晶晶.不同土地利用条件下土壤呼吸与环境因子的关系[D].太原:山西大学,2009.
[6]郭明英,朝克图,尤金成,等.不同利用方式下草地土壤微生物及土壤呼吸特性[J].草地学报,2012,20(1):42-48.
[7]Conant R T,Dalla-Betta P,Klopatek C C,et al.Controls on soil respiration in semiarid soils[J].Soil Biology and Biochemistry,2004,36(6):945-951.
[8]Davidson E A,Verchot L V,Cattanio J H,et al.Effects of soil water content on soil respiration in forests and cattle pastures of eastern Amazonia[J].Biogeochemistry,2000,48(1):53-69.
[9]Lee X,Wu H J,Sigler J,et al.Rapid and transient response of soil respiration to rain[J].Global Change Biology,2004,10(6):1017-1026.
[10]Liu X,Wan S,Su B,et al.Response of soil CO2efflux to water manipulation in a tallgrass prairie ecosystem[J].Plant and Soil,2002,240(2):213-223.
[11]Raich J W,Schlesinger W H.The global carbon dioxide flux in soil respiration and its relationship to vegetation and climate[J].Tellus B,1992,44(2):81-99.
[12]徐洪灵,张宏,张伟.川西北高寒草甸土壤呼吸速率日变化及温度影响因子比较[J].四川师范大学学报:自然科学版,2012,35(3):405-411.
[13]李洪建,王孟本.不同生态系统土壤呼吸与环境因子的关系研究[D].太原:山西大学,2008.
[14]Howard D M,Howard P.Relationships between CO2evolution,moisture content and temperature for a range of soil types[J].Soil Biology and Biochemistry,1993,25:1537.
[15]张剑锋.不同经营类型杉木人工林土壤呼吸率及影响因素研究[D].长沙:中南林业科技大学,2007.
[16]黄承才,葛滢.中亚热带东部三种主要木本群落土壤呼吸的研究[J].生态学报,1999,19(3):324-328.
[17]Xu M,Qi Y.Spatial and seasonal variations of Q 10 determined by soil respiration measurements at a Sierra Nevadan forest[J].Global Biogeochemical Cycles,2001,15(3):687-696.
[18]Mielnick P C,Dugas W A.Soil CO2flux in a tall grass Prairie[J].Soil Biology and Biochemistry,2000,32(2):221-228.
[19]杨晶,黄建辉,詹学明,等.农牧交错区不同植物群落土壤呼吸的日动态观测与测定方法比较[J].植物生态学报,2004,28(3):318-325.