华北山区非主要生长季典型人工林土壤呼吸变化特征
So il Respira tion of the Representa tive Artif ic ia l Forests Dur ing theM inor Growing Sea son in the Hilly Reg ion of North-China
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摘要: 2005年11月至2006年3月,利用L i－8100土壤呼吸自动观测系统及AR－A－ECH土壤温度湿度自动观测系统,观测了华北山区30年生侧柏和25年生栓皮栎林土壤呼吸速率与土壤温度及湿度,分析了非主要生长季土壤呼吸变化特征。结果表明: (1)晴或多云条件下, 2种人工林林地土壤呼吸速率都明显高于阴天,但日变化均不明显;整个非主要生长季,土壤呼吸速率(SRR)呈现出明显的日际变化特征; 2005年11月至2006年1月, SRR 呈显著降低的趋势,在2月份,维持在相对较低水平,进入3月中旬则迅速回升,降雪使SRR 均有不同程度的增加;整个非主要生长季,侧柏林地与栓皮栎林地的平均SRR分别为0. 61、0. 39μmol·m-2 ·s-1。( 2) 2种人工林林地地表及地下5、10、15、20 cm深处土壤温度与SRR都存在显著的指数相关关系( p pp < 0. 01) ,且比较偏相关系数表明:影响2种林地土壤呼吸速率的最主要土壤环境因子都是土壤温度。Abstract: Soil resp iration of two rep resentative artificial forests during the minor growing season in the hilly region ofNorth2China, in case of 30 years old Platycladus orienta lis and 25 years old Ouercus variabili, were analyzed. Soilresp iration rate wasmeasured by L i-8100 automatic monitoring system, and the soil temperature and soilwater content wasmeasured by AR-A-ECH automatic monitoring system from Nov. of 2005 toMar. of 2006 . The main results are as follows: ( 1 ) For both the two artificial forests, soil resp iration rate ( SRR ) in clear-cloudy day wasmarkedly higher than that in overcast day, but the diurnal variation of SRR was not apparent under the two weatherconditions. Daily SRR changed significantly, and characterized with that SRR decreased sharp ly from November toJanuary of the next year, and maintained at a relatively low value in February, and then increased rap idly after themiddle ofMarch. Snowingmade SRR rise varying extents during this season. The average SRR of Platycladus orienta lis and Ouercus variabiliwere 0. 61μmol?m-2 ?s-1 and 0. 39μmol?m-2 ?s-1 respectively in the whole minor growing season. (2) Significant relationship were found between the two artificial forests SRR and soil temperaturesat the 0, 5, 10, 15 and 20 cm dep th from the soil surface ( p -2 ?s-1 and 1. 60-μmol?m-2 ?s-1 respectively. SRR was also correlatedwith the soilwater content ( p < 0. 01) , the regression equation for Platycladus orienta liswas linear, butmultinomialfor Ouercus variabili. SRR was significantly related to soil temperature ( Ts) and soil water content ( SW ) at 5 cmdep th. Ts was the most important factor that effected on SRR for both the two artificial forests through comparing thepartial coefficient of Ts and SW at the 5 cm dep th.
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