华北低山丘陵区石榴-小麦间作系统的土壤呼吸特征——以河南省济源市试验点为例

Soil Respiration of Punica granatum -Triticum aestivum Intercropping System in Hilly Area of Northern China

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1.813μmol.m-2.s-1和1.642μmol.m-2.s-1。(2)间作系统和单作系统SRR与15cm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20cm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 period,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 temperature sensitivity of soil respiration（Q10） for the P.granatum-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.