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BioEnergy Research

, Volume 9, Issue 2, pp 633–642 | Cite as

Sorghum and Switchgrass as Biofuel Feedstocks on Marginal Lands in Northern China

  • Hai Mei Fu
  • Fan Yu Meng
  • R. L. Molatudi
  • Bao Gui ZhangEmail author
Article

Abstract

To avoid food versus fuel conflicts in China, the production of bioenergy crops requires the evaluation of marginal lands under arid and semiarid conditions. We conducted field experiments with sorghum (Sorghum bicolor (L.) Moench) and switchgrass (Panicum virgatum L.) in Northern China. The biomass yield and nutrient (N, P, and K) accumulation of sorghum (leaves and stalks) and switchgrass (aboveground portion) were examined in 2012 and 2013. The soil organic carbon (SOC) content at depths of 0–30 cm was quantified at sorghum, switchgrass, and native grassland sites. The aboveground biomass yield of sorghum averaged 13.9 t ha−1 (14.2 and 13.6 t ha−1 in 2012 and 2013, respectively), while the switchgrass yield had a higher variability (14.8 versus 8.1 t ha−1 in 2012 and 2013, respectively) and averaged 11.5 t ha−1. The removals of N, P, and K averaged 56, 10, and 160 kg ha−1, respectively, for sorghum and 41, 11, and 89 kg ha−1, respectively, for switchgrass. To attain maximum biomass yield with minimum nutrient removal and the lowest transportation costs (due to the moisture content), the switchgrass harvest should be delayed until approximately 160 days after regrowth (DAR) in this region, whereas sorghum, which matures earlier, can be harvested as early as 120 days after sowing (DAS). Earlier harvests would increase the flexibility for large-scale ethanol production facilities. The SOC content within the 0–15-cm layer averaged 15.8 and 11.6 g C kg−1 before and 3 years after the establishment of the switchgrass culture, respectively, although the SOC increased with the culture age. In contrast, the SOC content of the 15–30-cm layer did not differ between the adjacent native grassland and the switchgrass planting. Under sorghum, the SOC content was reduced although it did not differ significantly from that of the native grassland at a significance level of p < 0.05. We conclude that high biomass yields can be obtained from the two crops under natural rainfall in the arid and semiarid conditions of Northern China. To address nutrient removal and SOC reduction, the leaves of sorghum should be returned to the field to increase the input of organic materials into the soil and reduce nutrient removal, which enhances soil fertility and sustainable production.

Keywords

Sustainability Soil nutrient removal Sorghum Switchgrass Marginal lands Arid and semiarid conditions 

Notes

Acknowledgments

This research was supported by the National Natural Science Foundation of China (31470555), the Chinese Universities Scientific Fund (project no. 2014 JD 053), and the Program for Changjiang Scholars and Innovative Research Team in University (Project IRT0412) of P.R. China.

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Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  • Hai Mei Fu
    • 1
    • 4
  • Fan Yu Meng
    • 2
    • 4
  • R. L. Molatudi
    • 2
    • 3
    • 4
  • Bao Gui Zhang
    • 1
    • 4
    Email author
  1. 1.College of Resources and Environmental SciencesChina Agricultural UniversityBeijingPeople’s Republic of China
  2. 2.College of Agronomy and BiotechnologyChina Agricultural UniversityBeijingPeople’s Republic of China
  3. 3.School of Agricultural and Environmental SciencesUniversity of LimpopoSovengaSouth Africa
  4. 4.National Energy R&D Center for BiomassChina Agricultural UniversityBeijingPeople’s Republic of China

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