Impact of Meteorological factors on wheat growth period and irrigation water requirement —A case study of the Beijing-Tianjin-Hebei region in China

Xu, Chengcheng; Lu, Chuiyu; Wang, Jianhua

doi:10.1101/2021.01.04.425202

Cited by 2 publications

(1 citation statement)

References 29 publications

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“…Grain production and security are often threatened by drought, and frequent drought will restrict the agricultural development of Henan Province. For example, in the summer of 2014, Henan Province suffered a major drought disaster, resulting in crop losses of 1.809 million hectares, which not only brought huge losses to farmers, but also led to an economic loss of 11.06 billion yuan in Henan Province [15]. As Henan Province experiences rapid economic development and people's living standards continue to improve, the demand for water is escalating daily.…”

Section: Introductionmentioning

confidence: 99%

Temporal and Spatial Characteristics of Agricultural Drought Based on the TVDI in Henan Province, China

Li,

Wang,

Wang

et al. 2024

Water

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As a major grain-producing province in China’s Central Plains, Henan Province is severely impacted by drought, making the study of agricultural drought characteristics in the region crucial. Theil–Sen (Sen) trend analysis, the Mann–Kendall (M-K) test and the Hurst index method were used to systematically analyze the spatial variation characteristics of agricultural drought based on the Temperature Vegetation Dryness Index (TVDI). The results show that: (1) The drought occurs in central, northwestern and southern Henan on an annual scale. The drought situation will continue to increase in northern, eastern northeastern and central Henan. (2) The drought in spring, summer and winter showed an increasing trend, but the opposite trend was observed in autumn. The increasing trend of drought in each season is mainly distributed in northern, central and eastern Henan. (3) The drought in January, February, April, July, September and December showed an increasing trend, while the drought in the other 6 months showed a decreasing trend. The increase in drought during July and August was not pronounced, while the drought situation in September remained largely unchanged. The distribution of drought across the other months exhibited varying patterns across different regions. Overall, the drought trend in Henan Province is on the rise, displaying distinct seasonal and regional patterns in its temporal and spatial distribution. The results can provide a reference for Henan Province to formulate effective measures of drought resistance and disaster reduction to ensure grain production.

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Section: Introductionmentioning

confidence: 99%

Temporal and Spatial Characteristics of Agricultural Drought Based on the TVDI in Henan Province, China

Li,

Wang,

Wang

et al. 2024

Water

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Isotopic Composition (δ15N and δ18O) of Urban Forests in Different Climate Types Indicates the Potential Influences of Traffic Exhaust and Relative Humidity

Gong¹,

Xian²,

Ouyang³

2022

Forests

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Previous studies have shown that climatic and anthropogenic factors influence the variations in the stable isotope signature of tree materials in an urban ecosystem. However, the responses of urban trees to various anthropogenic and precipitation interventions are unclear. To fill the research gap, the isotopic composition (δ15N and δ18O) and total nitrogen content of the soil-plant system of urban forests were measured, focusing on typical urban tree species (Populus tomentosa and Ficus virens). The research was done under various land uses in China’s Beijing and Shenzhen megacities (with different humidity conditions). The linear mixed-effect model revealed that the δ15N values in the leaves of roadside Ficus virens were significantly higher than those in urban park sites, away from the road (δ15N difference = 7.2‰). In contrast, Populus tomentosa leaves exhibited a non-significant difference (δ15N difference = −1.8‰). Further regression analysis revealed that the variations in δ15N in tree leaves could be attributed to the proximity to highways, suggesting the influence of vehicle exhaust on δ15N values in roadside trees. The linear mixed-effect model also revealed δ18O values significantly higher in Populus tomentosa leaves than in Ficus virens leaves. To assess the influence of humidity conditions on δ18O values in the leaves, the ratio of the atmospheric and intercellular vapor pressures (ea/ei) of tree canopies was estimated. The result revealed that the ea/ei of Ficus virens was significantly higher than for Populus tomentosa, ascribed to the variation in the humidity conditions of the two megacities. These results highlight that urban trees can potentially serve as bioindicators for atmospheric pollution and humidity. Our findings highlight the ecophysiological responses of urban forests related to N and O as they vary according to traffic exhaust and relative humidity. Consequently, they are potentially valuable indicators of urban atmospheric contamination, forming a nature-based solution for citizen welfare improvement.

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Impact of Meteorological factors on wheat growth period and irrigation water requirement —A case study of the Beijing-Tianjin-Hebei region in China

Cited by 2 publications

References 29 publications

Temporal and Spatial Characteristics of Agricultural Drought Based on the TVDI in Henan Province, China

Temporal and Spatial Characteristics of Agricultural Drought Based on the TVDI in Henan Province, China

Isotopic Composition (δ15N and δ18O) of Urban Forests in Different Climate Types Indicates the Potential Influences of Traffic Exhaust and Relative Humidity

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