Variations in Deuterium and Oxygen-18 Isotope Compositions and Water Utilizations by Crops in the Cropland Ecosystem, Qinghai Lake Watershed

LI Jing, WU Hua-wu, LI Xiao-yan, HE Bin, PEI Ting-ting, JIANG Zhi-yun, BAO Zhi-cheng

JOURNAL OF NATURAL RESOURCES ›› 2017, Vol. 32 ›› Issue (8) : 1348-1359.

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JOURNAL OF NATURAL RESOURCES ›› 2017, Vol. 32 ›› Issue (8) : 1348-1359. DOI: 10.11849/zrzyxb.20160766
Resource Ecology

Variations in Deuterium and Oxygen-18 Isotope Compositions and Water Utilizations by Crops in the Cropland Ecosystem, Qinghai Lake Watershed

  • LI Jing1, WU Hua-wu2, 3, LI Xiao-yan3, HE Bin2, PEI Ting-ting3, JIANG Zhi-yun3, BAO Zhi-cheng3
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Abstract

Water condition is commonly considered as an important factor affecting the yields of crops. The water use patterns of Brassica napus and Avena sativa during the growing season remain unclear in the Qinghai Lake watershed. In this paper, the stable isotope compositions in precipitation, plant xylem of Brassica napus and Avena sativa and soil water during the entire growing season were collected and the utilization ratios of soil water of the two crops were analyzed with direct comparison method and mixing IsoSource model. The results showed that the stable isotopic compositions in precipitation showed great fluctuations. The isotopic contents in shallow soil water, subject to the effect of evaporation, are more abundant than those in deep soil water. Brassica napus mainly used soil water at 0-10 cm layer at the jointing stage (95.1%), 0-10 cm layer at the flowering stage (68% and 44.8%), 30-60 cm layer at the filling stage (69.9%) and 0-10 cm layer at the full ripe stage (38.8%). Avena sativa mainly utilized the soil water at 0-10 cm and 10-30 cm layers during the whole growing period. This finding provides the basis for adjusting tillage manners and developing water-saving and efficient modern agriculture in alpine regions.

Key words

Avena sativa / Brassica napus / growing season / mixing IsoSources model / precipitation / Qinghai Lake Watershed / soil water

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LI Jing, WU Hua-wu, LI Xiao-yan, HE Bin, PEI Ting-ting, JIANG Zhi-yun, BAO Zhi-cheng. Variations in Deuterium and Oxygen-18 Isotope Compositions and Water Utilizations by Crops in the Cropland Ecosystem, Qinghai Lake Watershed[J]. JOURNAL OF NATURAL RESOURCES, 2017, 32(8): 1348-1359 https://doi.org/10.11849/zrzyxb.20160766

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Funding

National Natural Science Foundation of China, No. 41471460 and 41025001Talent Introduction Project of Nanjing Institute of Geography and Limnology, CAS, No. Y7SL011001A Scentific Research Project for New Century Excellent Talents of Jiangxi Earthquake Administration, No. JXDZ-YXRC20171.
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