Characteristics of Diurnal Variation of Water Use Efficiency of Maize in Sandy Land

doi:10.7522/j.issn.1000-694X.2018.00003

Journal of Desert Research ›› 2019, Vol. 39 ›› Issue (1): 142-148.DOI: 10.7522/j.issn.1000-694X.2018.00003

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Characteristics of Diurnal Variation of Water Use Efficiency of Maize in Sandy Land

Niu Yayi^1,2, Li Yuqiang¹, Wang Xuyang^1,2, Gong Xiangwen^1,2, Yang Huan¹

1. Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China

Received:2017-12-05 Revised:2018-01-12 Published:2019-02-14

Abstract

Abstract: Based on the eddy covariance system and LI-COR6400 infrared gas analysis meter, the present study simultaneously investigated instantaneous CO₂ and H₂O exchange rate, and analyzed instantaneous water use efficiency in agriculture ecosystem with corn land during main period phases, including seedling stage, jointing stage, heading stage, grain-filling stage, and maturity stage in Horqin Sandy Land. The results showed that a "L" pattern of the diurnal with respect to instantaneous water use efficiency (WUE_C) at the colony scale could be presented, the peaks were observed after sunrise (about 06:00) of which sizes were 0.025, 0.039, 0.088, 0.058 and 0.191 gCO₂·g^-1H₂O, respectively, a "~" pattern of the diurnal dynamics of leaf instantaneous water use efficiency (WUE_L) occurred, the peaks appeared during 06:00-10:00, with sizes of 0.029, 0.041, 0.017, 0.019 and 0.024 gCO₂·g^-1H₂O. The exchange rates of instantaneous carbon dioxide at the colony scale were -2.205, -26.113, -26.118, -8.201 and -3.672 μmolCO₂·m^-2·s^-1, while the leaf scale were 27.57, 59.55, 24.38, 22.03 and 20.09 μmolCO₂·m^-2·s^-1. Significant difference was obtained in instantaneous gas exchange and water use efficiency for summer corn colony and leaf scales at different growth stages.

Key words: maize, leaf, canopy, daily dynamics, instantaneous water use efficiency

CLC Number:

S513

Niu Yayi, Li Yuqiang, Wang Xuyang, Gong Xiangwen, Yang Huan. Characteristics of Diurnal Variation of Water Use Efficiency of Maize in Sandy Land[J]. Journal of Desert Research, 2019, 39(1): 142-148.

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Characteristics of Diurnal Variation of Water Use Efficiency of Maize in Sandy Land

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