在2010年3月至2010年6月,利用Li-8100土壤呼吸自动观测系统,研究了位于河南省济源市的华北低山丘陵区石榴-小麦间作系统(间作系统)和小麦单作系统(单作系统)内土壤呼吸速率(SRR)的时间变化特征及其与土壤温度和湿度的关系.结果表明:(1)间作系统和单作系统的SRR在晴天-多云均表现出明显的时间变化特征,呈单峰变化趋势,在阴天日波动变化幅度较小.SRR在晴天-多云和阴天与土壤温度的变化趋势均基本一致.间作系统的SRR高于单作系统.整个观测时期内间作系统和单作系统的平均SRR分别为1.813 μmol·m-2·s-1和1.642 μmol·m-2·s-1.(2)间作系统和单作系统SRR与15 cm处土壤温度存在显著的指数相关关系,在该深处的Q10值分别为1.73和1.49.(3)间作系统和单作系统与20 cm处的土壤体积含水量与SRR的相关关系均不明显.%Soil respiration under the Punica granatum -Triticum aestivum intercropping and T. aestivum monoculture systems were measured by Li -8100 in Jiyuan city of Henan Province during the growing season of March -June 2010. The relationship between the soil respiration and environmental factors were studied. The results showed that SRR in sunny -cloudy days showed a significant diurnal variation at both two systems. The SRR showed a single peak curve for the P. granatum -T. aestivum intercropping and T. aestivum monoculture systems, and the fluctuations at the cloudy day changed little. The change of the SRR on a sunny -cloudy day was consistent with the variation of soil temperature, and the SRR of the P. granatum -T. aestivum intercropping was higher than that in the T. aestivum monoculture system. During the study periodi the average SRR was 1. 813 μmol · m-2 · s-1 and 1. 642 μmol· m-2 · s-1 for the P. granatum-T. aestivum intercropping and T. aestivum monoculture system, respectively. The tempera- ture sensitivity of soil respiration (Q10) for the P. granatam-T. aestivum intercropping and T. aestivum monoculture systems were 1. 73 and 1. 49, repectively. There was no significant relationship between soil respiration and soil water content for the P. granatum -T. aestivum intercropping and T. aestivum monoculture systems in this study.
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