黄土高原不同林龄刺槐林土壤呼吸研究
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摘要
采用LI-8100开路式土壤呼吸仪对不同林龄(10,12,13,16a)刺槐林土壤呼吸速率、温度、水分进行了测定。结果表明:(1)不同林龄刺槐林土壤呼吸速率均呈现明显的日动态和季节动态,表现出夏季>秋季>冬季;(2)各林龄刺槐林土壤呼吸速率与大气温度、地表温度、5cm土壤温度均有很好的指数关系,尤其与5cm土壤温度的相关性最好,且各林龄刺槐林的Q10存在差异,表现为随着林龄的增大,Q10值也随之增大;(3)各林龄刺槐林土壤呼吸速率与土壤体积含水量具有很好的线性关系,且相关性都达到了显著水平(p<0.05);(4)各林龄刺槐林土壤呼吸速率与5cm土壤温度、土壤体积含水量的综合作用也具有很好的相关性,且都达到了极显著水平(p<0.01),二者共同解释了土壤呼吸变异的93.8%~98.1%,且双因素模型远比单因素能够更好地解释刺槐林土壤呼吸速率的变异。
The soil respiration,temperature and moisture in the different forest ages(10,12,13,16years)of Robinia pseudoacacia were determined by using the LI-8100open-type soil respiration apparatus.The results showed that:(1)the soil respiration rates in different forest ages of locust forest showed a significant diurnal and seasonal dynamics,and followed the seasonal sequence of summer>autumn>winter;(2)there is a good exponential relationship between the three temperatures and the soil respiration rates in different forest ages of locust forest,especially there is the best correlation with soil temperature in 5cm layer and there are differences in Q10 between the different forest ages of locust forest,Q10 was associated with the increase of forest ages;(3)a highly significant linear correlations between the soil respiration rate and the soil volumetric water content in the different forest ages of locust forest were observed(p<0.05);(4)the comprehensive effect of soil respiration rate and soil temperature in 5cm depth and soil volumetric water content in the different forest ages of locust forest,has a highly significant linear correlation(p<0.01)which can explain soil respiration variation of 93.8%~98.1%,and two-factor model explaining locust forest soil respiration rate variability is better than single-factor model.
The soil respiration,temperature and moisture in the different forest ages(10,12,13,16years)of Robinia pseudoacacia were determined by using the LI-8100open-type soil respiration apparatus.The results showed that:(1)the soil respiration rates in different forest ages of locust forest showed a significant diurnal and seasonal dynamics,and followed the seasonal sequence of summer>autumn>winter;(2)there is a good exponential relationship between the three temperatures and the soil respiration rates in different forest ages of locust forest,especially there is the best correlation with soil temperature in 5cm layer and there are differences in Q10 between the different forest ages of locust forest,Q10 was associated with the increase of forest ages;(3)a highly significant linear correlations between the soil respiration rate and the soil volumetric water content in the different forest ages of locust forest were observed(p<0.05);(4)the comprehensive effect of soil respiration rate and soil temperature in 5cm depth and soil volumetric water content in the different forest ages of locust forest,has a highly significant linear correlation(p<0.01)which can explain soil respiration variation of 93.8%~98.1%,and two-factor model explaining locust forest soil respiration rate variability is better than single-factor model.
引文
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[21]Qi Y,Xu M.Separating the effects of moisture and temperature on soil CO2efflux in a coniferous forest in the Sierra Nevada mountains[J].Plant and Soil,2001,237(1):15-23.
[22]杨玉盛,董彬,谢锦升,等.森林土壤呼吸及其对全球变化的响应[J].生态学报,2004,24(3):583-591.
[2]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.
[3]Fernandez I J,Son Y,Kraske C R,et al.Soil carbon dioxide characteristics under different forest types and after harvest[J].Soil Science Society of America Journal,1993,57(4):1115-1121.
[4]刘绍辉,方精云.土壤呼吸的影响因素及全球尺度下温度的影响[J].生态学报,1997,17(5):469-476.
[5]Post W M,Emanuel W R,Zinke P J,et al.Soil carbon pools and world life zones[J].Nature,1982,298:156-159.
[6]史宝库,金光泽,汪兆洋.小兴安岭5种林型土壤呼吸时空变异[J].生态学报,2012,32(17):5416-5428.
[7]尉海东.中亚热带三种人工林生态系统碳贮量及土壤呼吸研究[D].福州:福建农林大学,2005:39-50.
[8]Qi Y,Xu M.Separating the effects of moisture and temperature on soil CO2efflux in a coniferous forest in the Sierra Nevada mountain[J].Plant and Soil,2001,237(1):15-23.
[9]严俊霞,秦作栋,李洪建,等.黄土高原地区柠条人工林土壤呼吸[J].林业科学,2010,46(3):1-8.
[10]龚斌,王风玉,张继平,等.中亚热带森林土壤呼吸日变化及其与土壤温湿度的关系[J].生态环境学报,2013,22(8):1275-1281.
[11]张劲松,孟平,王鹤松,等.华北石质山区刺槐人工林的土壤呼吸[J].林业科学,2008,44(2):8-14.
[12]尉海东,马祥庆.中亚热带3种主要人工林的土壤呼吸动态[J].福建农林大学学报:自然科学版,2006,35(3):272-277.
[13]吴仲民.尖峰岭热带森林土壤C储量和CO2排放量的初步研究[J].植物生态学报,1997,21(5):416-423.
[14]周存宇,周国逸,王迎红,等.鼎湖山针阔叶混交林土壤呼吸的研究[J].北京林业大学学报,2005,27(4):23-27.
[15]Drr H,Münnich K O.Annual variation in soil respiration in selected areas of the temperate zone[J].Tellus B,1987,39(1-2):114-121.
[16]彭家中,常宗强,冯起.温度和土壤水分对祁连山青海云杉林土壤呼吸的影响[J].干旱区资源与环境,2008,22(3):165-169.
[17]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.
[18]Keith H,Jacobsen K L,Raison R J.Effects of soil phosphorus availability,temperature and moisture on soil respiration in Eucalyptus pauciflora forest[J].Plant and Soil,1997,190(1):127-141.
[19]李凌浩,陈佐忠.草地群落的土壤呼吸[J].生态学杂志,1998,17(4):45-51.
[20]Rey A,Pegoraro E,Tedeschi V,et al.Annual variation in soil respiration and its components in a coppice oak forest in Central Italy[J].Global Change Biology,2002,8(9):851-866.
[21]Qi Y,Xu M.Separating the effects of moisture and temperature on soil CO2efflux in a coniferous forest in the Sierra Nevada mountains[J].Plant and Soil,2001,237(1):15-23.
[22]杨玉盛,董彬,谢锦升,等.森林土壤呼吸及其对全球变化的响应[J].生态学报,2004,24(3):583-591.