通过改变紫云英-油菜间作系统中的水热因子来降低土壤二氧化碳排放通量。
Reduction in soil CO efflux through alteration of hydrothermal factor in milk vetch ( L.)-rapeseed ( L.) intercropping system.
作者信息
Zhou Quan, Gunina Anna, Chen Jiao, Xing Yi, Xiong Ying, Guo Zhiming, Wang Longchang
机构信息
College of Agronomy and Biotechnology, Southwest University/Key Laboratory of Eco-environments in Three Gorges Reservoir Region, Ministry of Education/Engineering Research Center of South Upland Agriculture, Ministry of Education, Chongqing, China.
Jiangxi Agricultural University/Key Laboratory of Crop Physiology, Ecology and Genetic Breeding, Ministry of Education, Nanchang, China.
出版信息
Front Plant Sci. 2023 Jan 10;13:1093507. doi: 10.3389/fpls.2022.1093507. eCollection 2022.
INTRODUCTION
Intercropping has a potential to reduce the CO emission from farmlands. Limited information is available on the underlying reasons.
METHODS
This study investigated the effect of milk vetch ( L.) (MV), rapeseed ( L.) monoculture (RS) and intercropping (Intercrop) on soil CO emissions, moisture and temperature in a bucket experiment during 210 days from October 2015 to May 2016 on Chongqing, China.
RESULTS
The results showed that soil CO efflux of MV, RS and Intercrop was 1.44, 1.55 and 2.08 μmol·m·s during seedling and stem elongation stages and 3.08, 1.59 and 1.95 μmol·m·s during flowering and podding stages. At seeding and stem elongation stages Intercrop had 1.4 times higher soil CO efflux than the mean of MV and RS. In contrast, MVhad 1.6 times higher soil CO efflux than Intercrop thereafter, which shows it was inhibited if milk vetch presents as Intercrop only. Decreased sensitivity of soil respiration to temperature in 1.4 times and lower soil moisture by Intercrop were found compared to MV. Intercrop decreased soil moisture, especially at the seedling and stem elongation stages, compared to the monoculture. The fluctuation on soil respiration in RS and Intercrop was slight with changes in soil moisture.
CONCLUSION
Thus, milk vetch-rapeseed system has a potential to decrease CO emission from farmland, however soil moisture should be regulated properly.
引言
间作有潜力减少农田的二氧化碳排放。关于其潜在原因的信息有限。
方法
本研究于2015年10月至2016年5月在中国重庆进行了为期210天的桶栽试验，研究了紫云英（Astragalus sinicus L.）（MV）、单作油菜（Brassica napus L.）（RS）和间作（Intercrop）对土壤二氧化碳排放、湿度和温度的影响。
结果
结果表明，紫云英、油菜单作和间作在幼苗期和茎伸长阶段的土壤二氧化碳通量分别为1.44、1.55和2.08 μmol·m⁻²·s⁻¹，在开花期和结荚期分别为3.08、1.59和1.95 μmol·m⁻²·s⁻¹。在播种期和茎伸长阶段，间作的土壤二氧化碳通量比紫云英和油菜单作的平均值高1.4倍。相比之下，此后紫云英的土壤二氧化碳通量比间作高1.6倍，这表明仅作为间作作物存在时紫云英受到了抑制。与紫云英相比，间作使土壤呼吸对温度的敏感性降低了1.4倍，土壤湿度降低。与单作相比，间作降低了土壤湿度，尤其是在幼苗期和茎伸长阶段。油菜单作和间作中土壤呼吸随土壤湿度变化的波动较小。
结论
因此，紫云英 - 油菜系统有潜力减少农田的二氧化碳排放，然而土壤湿度应得到适当调节。
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