Vaishnavi Varikuti, Poulamee Chakraborty, Suite Xu, Navreet K. Mahal, Sandeep Kumar
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Soil water retention, saturated hydraulic conductivity ( Ksat), thermal conductivity (λ), soil organic carbon (SOC), and total N (TN) concentrations were measured. Soil pore characteristics were measured using X-ray computed tomography. The PCG–KC had 1.42 g kg−1 TN and 24 g kg−1 SOC at 0–10 cm, non-significant to PCG-75, 150, and 225 N. Nonetheless, TN significantly increased in both PCG–KC and other fertilized treatments compared to the control. Intercropping boosted macroporosity (0.024 cm3 cm−3), Ksat (+50%), and lowered λ (−1%), compared to the N fertilized treatments. Soil cumulative CO2 under PCG–KC (1012.67 kg C ha−1) was similar to PCG-75, 150 N, but lower than PCG-225 N (1418.66 kg C ha−1). 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引用次数: 0
摘要
草原脐草(PCG)是一种多年生作物,具有在贫瘠土地上生产生物燃料的潜力。将多年生豆科植物库拉苜蓿(KC)与 PCG 间作,可减少化肥用量,同时保持土壤水物理条件。本研究的目的是比较 PCG 与 KC(PCG-KC)间作以及 PCG 施用分级氮肥(0、75、150 和 225 N kg ha-1)时的土壤水物理特性和温室气体通量。2021 年夏季,采集了土壤样本(0-10 厘米)。此外,同年 4 月至 9 月期间,每周采集气体样本。测量了土壤保水性、饱和导水性(Ksat)、导热性(λ)、土壤有机碳(SOC)和全氮(TN)浓度。使用 X 射线计算机断层扫描测量了土壤孔隙特征。PCG-KC 在 0-10 厘米处的 TN 和 SOC 分别为 1.42 克/千克和 24 克/千克,与 PCG-75、150 和 225 N 相比差异不大。与施用氮肥的处理相比,间作提高了大孔隙度(0.024 cm3 cm-3)和 Ksat(+50%),降低了 λ(-1%)。PCG-KC 条件下的土壤累积 CO2(1012.67 kg C ha-1)与 PCG-75 和 150 N 条件下的土壤累积 CO2(1418.66 kg C ha-1)相似,但低于 PCG-225 N 条件下的土壤累积 CO2(1418.66 kg C ha-1)。总之,这项研究表明,与使用氮肥相比,PCG-KC 是一种可持续的选择,因为它们具有相似的水文物理特性,在减少温室气体排放方面的能力也相当。
Soil surface greenhouse gas emissions and hydro-physical properties as impacted by prairie cordgrass intercropped with kura clover
Prairie cordgrass (PCG) is a perennial crop which has the potential for biofuel production under marginal lands. The intercropping of a perennial legume, kura clover (KC) with PCG can reduce the use of chemical fertilizer while maintaining the soil hydro-physical conditions. The objective of this study was to compare the soil hydro-physical properties and greenhouse gas (GHG) fluxes under PCG intercropped with KC (PCG–KC), and PCG fertilized with graded levels of N (0, 75, 150, and 225 N kg ha−1). During the summer of 2021, soil samples (0–10 cm) were collected. Additionally, gas samples were collected weekly from April through September of the same year. Soil water retention, saturated hydraulic conductivity ( Ksat), thermal conductivity (λ), soil organic carbon (SOC), and total N (TN) concentrations were measured. Soil pore characteristics were measured using X-ray computed tomography. The PCG–KC had 1.42 g kg−1 TN and 24 g kg−1 SOC at 0–10 cm, non-significant to PCG-75, 150, and 225 N. Nonetheless, TN significantly increased in both PCG–KC and other fertilized treatments compared to the control. Intercropping boosted macroporosity (0.024 cm3 cm−3), Ksat (+50%), and lowered λ (−1%), compared to the N fertilized treatments. Soil cumulative CO2 under PCG–KC (1012.67 kg C ha−1) was similar to PCG-75, 150 N, but lower than PCG-225 N (1418.66 kg C ha−1). Overall, this study showed that PCG–KC can be a sustainable option over the use of N fertilizers since they had similar levels of hydro-physical characteristics and had a comparable ability to mitigate GHG emissions.
期刊介绍:
The Canadian Journal of Soil Science is an international peer-reviewed journal published in cooperation with the Canadian Society of Soil Science. The journal publishes original research on the use, management, structure and development of soils and draws from the disciplines of soil science, agrometeorology, ecology, agricultural engineering, environmental science, hydrology, forestry, geology, geography and climatology. Research is published in a number of topic sections including: agrometeorology; ecology, biological processes and plant interactions; composition and chemical processes; physical processes and interfaces; genesis, landscape processes and relationships; contamination and environmental stewardship; and management for agricultural, forestry and urban uses.