Welcome to Acta Prataculturae Sinica ! Today is Share:

Acta Prataculturae Sinica ›› 2022, Vol. 31 ›› Issue (6): 163-177.DOI: 10.11686/cyxb2021165

Previous Articles    

The relationship between attack by Prosodes dilaticollis and desert grassland changes in Xinjiang: A case study of southern mountain grassland in Changji

Jiang-long SHEN1(), Ji-jun CHEN2, Abuduwali IMAM2, Kun YANG2, Ya-ting GUO2, Jiang-hua ZHENG1()   

  1. 1.College of Resources and Environment Sciences,Xinjiang University,Urumqi 830046,China
    2.The Office for Disaster Management of Locusts and Rats,Xinjiang,Urumqi 830000,China
  • Received:2021-04-28 Revised:2021-09-22 Online:2022-06-20 Published:2022-05-11
  • Contact: Jiang-hua ZHENG

Abstract:

This research explored the coupling relationship between the occurrence of the pest Prosodes dilaticollis and grassland degradation. The impact of the pest on grassland vegetation was quantitatively analyzed, so as to provide a theoretical basis for government officials managing grasslands to scientifically and effectively manage the pests. The study used multi-temporal remote images obtained from the HJ-1 satellite system (HJ-1 satellite system is an earth observation system of China specially used for environmental and disaster monitoring. It is composed of two optical satellites and one radar satellite. It has a variety of optical, infrared and hyperspectral detection means, and has the ability of wide-range, all-weather, all-time and dynamic environmental and disaster monitoring), land cover product and meteorological data to infer grassland vegetation coverage and climatic drivers. Based on field survey data using overlay analysis, correlation analysis, one-way ANOVA and linear trend analysis were used to quantitatively analyze the interaction between grassland status, climatic factors and P. dilaticollis occurrence, to investigate factors and mechanisms involved in pest outbreaks. The results showed that: there was a significant negative correlation between the insect density and NDVI (normalized differential vegetation index). The NDVI decreased with the aggravation of pest, and was assigned four damage categories: level 3 (severe)<level 2 (moderate)<level 0 (control)<level 1 (mild). There was no correlation between the population density of P. dilaticollis and the interannual vegetation coverage variation and there was no significant difference among the damage categories. Bare land such as riverbeds, river flood beaches, and farming-pastoral zone are highly prone to outbreaks of P. dilaticollis, but the insect density is low in grasslands. Sites with a high measured density of P. dilaticollis have no spatial correlation with the degraded areas of grassland. Desert grassland ecosystems are fragile and sensitive. Grassland degradation is the result of the interaction of aridity and overgrazing, and is not directly caused by P. dilaticollis.

Key words: desert grassland, Prosodes dilaticollis, normalized difference vegetation index, linear trend analysis, one-way ANOVA