Photosynthetic performance of switchgrass and its relation to field productivity: A three-year experimental appraisal in semiarid Loess Plateau

doi:10.1016/S2095-3119(16)61397-7

Journal of Integrative Agriculture ›› 2017, Vol. 16 ›› Issue (06): 1227-1235.DOI: 10.1016/S2095-3119(16)61397-7

收稿日期:2016-02-15 出版日期:2017-06-20 发布日期:2017-06-08

Photosynthetic performance of switchgrass and its relation to field productivity: A three-year experimental appraisal in semiarid Loess Plateau

GAO Zhi-juan^1*, LIU Jin-biao^1*, AN Qin-qin², WANG Zhi^{1, 2}, CHEN Shao-lin³, XU Bing-cheng^{1, 2}

¹State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A&F University, Yangling 712100, P.R.China
²Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling 712100, P.R.China ³College of Life Science, Northwest A&F University, Yangling 712100, P.R.China

Received:2016-02-15 Online:2017-06-20 Published:2017-06-08
Contact: XU Bing-cheng, E-mail: bcxu@nwsuaf.edu.cn
Supported by:
This work was financially supported by the National Natural Science Foundation of China (41371509) and the Programs for New Century Excellent Talents in University, China (NCET-11-0444).

摘要/Abstract

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Abstract: To reveal photosynthetic characteristics and biomass yield is important for evaluating introduced species adaptation to local environments. A field experiment was conducted over three consecutive years (2011–2013) to evaluate photosynthetic characteristics, soil water content, aboveground biomass accumulation, and water use efficiency (WUE) in switchgrass (Panicum virgatum L.) populations exposed to three row spacing (20, 40 and 60 cm) treatments in two growth months (June and August) on the semiarid Loess Plateau of China. Results indicated that net photosynthetic rate (P_n), transpiration rate (T_r), instantaneous water use efficiency (WUE_i) and plant height of switchgrass showed an increased trend, but aboveground biomass production and WUE showed an decreased trend with enlarged row spacings over the three years. The maximum daily mean P_n values (17.9, 18.4 and 19.7 µmol CO₂ m^–2 s^–1) were observed in 2011, and the highest aboveground biomass production (67 771.8, 6 976.8 and 6 609.2 kg ha^–1) were recorded in 2012 for 20, 40 and 60 cm, respectively. A close correlation between tiller numbers and aboveground biomass production (r=0.907) was observed. P_n was positively and significantly correlated with biomass per tiller, but it showed a negative correlation with aboveground biomass production. Our results confirm that wide row spacing is beneficial for single plant development, while narrow row spacing favors biomass production and water use of switchgrass in the region. It also implies that single leaf growth and performance could explain the switchgrass community density differences, while fails to account for the aboveground biomass production.

Key words: switchgrass, photosynthesis, row spacing, biomass production, water use efficiency

. [J]. Journal of Integrative Agriculture, 2017, 16(06): 1227-1235.

GAO Zhi-juan, LIU Jin-biao, AN Qin-qin, WANG Zhi, CHEN Shao-lin, XU Bing-cheng . Photosynthetic performance of switchgrass and its relation to field productivity: A three-year experimental appraisal in semiarid Loess Plateau[J]. Journal of Integrative Agriculture, 2017, 16(06): 1227-1235.

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Photosynthetic performance of switchgrass and its relation to field productivity: A three-year experimental appraisal in semiarid Loess Plateau

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