Application of hydrogen and oxygen isotopes to study the source of water and competition in shelter-forest-cotton systems in the Xinjiang Oasis

Hui, 郭辉 Guo; Ying, 赵英 Zhao; Dongxu, 蔡东旭 Cai; Zhilong, 兰志龙 Lan; Jiaqiang, 雷加强 Lei

doi:10.5846/stxb201807101500

Cited by 2 publications

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“…After the boll opening stage, the shallow root density gradually decreased, while the deep root density increased in the range of 70-100 cm. In this study, the main water absorption depths were 0-20 cm and 40-80 cm in the bud stage and flowering and boll stage of cotton, which were similar to the results reported by Wang et al [33] (0-30 cm, 50-90 cm), Li et al [30] (0-30 cm, 30-60 cm), and Guo et al [29] (0-20 cm, 20-40 cm). In the late growth stages, the increase in irrigation amount and irrigation frequency increased the shallow soil water content, and a large number of cotton roots tended to gather toward the surface, which was slightly different from the observations of other studies.…”

Section: Discussionsupporting

confidence: 91%

“…A large number of studies have shown that stable hydrogen and oxygen isotopes do not fractionate during water absorption by plant roots, and the isotopic composition of xylem water can be regarded as a mixture of isotopic values in water from various sources [29,30]. The water absorption depth, determined via the direct comparison method, was generally consistent with that determined by the MixSIAR model.…”

Section: Discussionmentioning

confidence: 63%

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Water Consumption Structure and Root Water Absorption Source of an Oasis Cotton Field in an Arid Area of China

Zhao,

Chen,

et al. 2023

Water

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This research, conducted at the National Field Science Observation and Research Station of the Aksu Farmland Ecosystem in Xinjiang, was performed to partition evapotranspiration components, identify the main water absorption depth, and quantify the contribution of soil water at different depths during different growing stages of cotton by combining hydrogen and oxygen stable isotopes and the MixSIAR model. The results indicated that evapotranspiration in the seeding stage, bud stage, flowering and boll stage, boll opening stage, and harvesting stage were 88 mm, 137 mm, 542 mm, 214 mm, and 118 mm, respectively, and the corresponding transpiration accounted for 51%, 82%, 88%, 85%, and 72% of evapotranspiration. With the development of cotton roots, the water absorption depth gradually increased, and the main absorption depths in the late bud stage, mid flowering and boll stage, late flowering and boll stage, boll opening stage, and harvesting stage were 0–20 cm, 40–60 cm, 60–80 cm, 80–100 cm, and 0–20 cm, respectively, with corresponding contributions of 35.4%, 40.9%, 27.7%, 29.9%, and 22.5%. Our results can provide a theoretical foundation for the accurate irrigation management of cotton fields.

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Section: Discussionsupporting

confidence: 91%

Section: Discussionmentioning

confidence: 63%

Water Consumption Structure and Root Water Absorption Source of an Oasis Cotton Field in an Arid Area of China

Zhao,

Chen,

et al. 2023

Water

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Application of UAV Remote Sensing in Monitoring Water Use Efficiency and Biomass of Cotton Plants Adjacent to Shelterbelt

Wang²,

Xue³

et al. 2022

Front. Plant Sci.

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Tree shelterbelts are crucial for maintaining the ecological environment of oasis, but they may also compete for soil water with adjacent crops, affecting crop yields. To evaluate the impacts of the shelterbelt on water use efficiency (WUE) and normalized water productivity (WP) of adjacent cotton plants, the biomass (B) and WUE of cotton with different distances from the shelterbelt (0.1H, 0.5H, 1H, 2H, and 3H; average tree height = 15 m [H]) were estimated based on unmanned aerial vehicle (UAV) remote sensing data combined with the FAO crop water response model AquaCrop. Besides, the accuracy and universality of the estimation method were also evaluated. The results showed that the method based on UAV remote sensing data and AquaCrop can accurately estimate the impact range and intensity of shelterbelt on WUE, water consumption, and B of adjacent cotton plants. Fierce water competition between shelterbelt and cotton was detected within 0.1H−1H, and the competitiveness of the shelterbelt was weaker in the plots >1H than in the 0.1H−1H. The B, actual evapotranspiration (Tc), and WUE of cotton at 0.1H decreased by 59.3, 48.8, and 23.6%, respectively, compared with those at 3H, but the cotton plants at 2H and 3H were completely unaffected by the shelterbelt. Besides, the B estimated based on WP (root mean square error [RMSE] = 108 g/m2, d = 0.89) was more accurate than that estimated based on WUE (RMSE = 118 g/m2, d = 0.85). This study clarifies the inter-species competition for soil water between crops and shelterbelts under drip irrigation in oases in China.

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Application of hydrogen and oxygen isotopes to study the source of water and competition in shelter-forest-cotton systems in the Xinjiang Oasis

Cited by 2 publications

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Water Consumption Structure and Root Water Absorption Source of an Oasis Cotton Field in an Arid Area of China

Water Consumption Structure and Root Water Absorption Source of an Oasis Cotton Field in an Arid Area of China

Application of UAV Remote Sensing in Monitoring Water Use Efficiency and Biomass of Cotton Plants Adjacent to Shelterbelt

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