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Chinese Agricultural Science Bulletin ›› 2024, Vol. 40 ›› Issue (7): 86-92.doi: 10.11924/j.issn.1000-6850.casb2023-0243

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Ecological Service Value of Oasis for Reducing Downwind Sandstorm: A Case Study of Oasis Farmland and Protective Forest in Jingdian Irrigation Area

ZHANG Jinghui(), DONG Zhiyang, LIU Bin   

  1. Jingtaichuan Electric Power Irrigation Water Resource Utilization Center in Gansu Province, Jingtai, Gansu 730499
  • Received:2023-03-20 Revised:2023-07-11 Online:2024-02-27 Published:2024-02-27

Abstract:

Sandstorm is one of the main natural disasters in agricultural production in the vast sandy areas of northwest China. To reveal the ecological function (ecological service value) of oasis farmland and shelterbelt in reducing downwind sandstorms, the paper took Jingtaichuan Irrigation District in Gansu Province as an example, and used the distance cosine formula to analyze the ecological service value of oasis ecological elements to reduce sandstorms in the downwind area. The results showed that the total ecological service value of farmland, shelterbelt, grassland, wetland and canal in the irrigation area was 62253.0×104 yuan, within a range of 200 km in the downwind direction, the ecological service value of oasis farmland, shelterbelt, grassland and wetland in reducing downwind sandstorms was only 16.1% of the internal ecological service value of various ecological elements in the irrigation area. Due to the transmission characteristics of sandstorm, the transmission distance of ecological service value of farmland shelterbelt against sandstorm is much greater than that of windbreak and surface wind erosion protection. The distance cosine formula can better express the ecological service value of oasis farmland shelterbelt in reducing downwind sandstorm, with the increase of the distance and the increase of the angle with the main wind direction, the ecological service value of reducing the downwind sandstorm gradually decreases. The boundary of a sandstorm is blurry, and the maximum distance in the downwind area is an issue that needs further exploration.

Key words: oasis, downwind direction, sandstorm, distance cosine formula, ecological service value