Journal cover Journal topic
Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
Journal topic

Journal metrics

IF value: 3.102
IF3.102
IF 5-year value: 3.284
IF 5-year
3.284
CiteScore value: 5.1
CiteScore
5.1
SNIP value: 1.37
SNIP1.37
IPP value: 3.21
IPP3.21
SJR value: 1.005
SJR1.005
Scimago H <br class='widget-line-break'>index value: 90
Scimago H
index
90
h5-index value: 42
h5-index42
Preprints
https://doi.org/10.5194/nhess-2018-305
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/nhess-2018-305
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

  17 Dec 2018

17 Dec 2018

Review status
This preprint was under review for the journal NHESS but the revision was not accepted.

Research on Occurrence and Development of Pasture Drought Events in Alpine Grassland using the Drought Threshold

Tiaofeng Zhang1,2, Lin Li3, Hongbin Xiao4, and Hongmei Li1 Tiaofeng Zhang et al.
  • 1Qinghai Climate Center, Xining, 810000, PR China
  • 2College of Atmospheric Science, Lanzhou University, Lanzhou, 730000, PR China
  • 3Weather Modification Office of Qinghai Province, Xining, 810000, PR China
  • 4Qinghai Institute of Meteorological Science, Xining, 810000, PR China

Abstract. Pasture is vital to livestock husbandry development in Qinghai and even in North China. Drought is the primary meteorological disaster that affects pasture, but insufficient soil moisture is the most prominent cause of pasture drought. Timely and accurate determination of the soil moisture threshold of pasture is important for objective recognition and monitoring of the occurrence and development of pasture drought. This study aims at investigating pasture responses to soil drought as well as quantitative expression of soil drought degree and drought threshold. Test plots were selected from the pasture test station. Five testing groups were set according to coverage rate (0–100 %) at the initiation the pasture growth period. The impacts of profile moisture characteristics, drought threshold, and precipitation on duration of pasture drought were studied. Research results have demonstrated that moisture in the soil profile below 20 cm decreases slightly throughout drought events in alpine grassland. Changes of soil moisture in the 0–20 cm layer can generally reflect drought stress of the pasture. In the process of a drought event, the relationship between soil water storage and cumulative relative water loss can be expressed via a logarithmic linear equation. Quantitative expression of drought degree in grasslands can be realized by transforming the slope of this equation into the index D with an interval of [0, 1]. The occurrence rates of mild drought,moderate drought, and severe drought were 0.36, 0.45, and 0.70, respectively. The duration of severe drought was closely related with initial soil moisture. The relationship between duration of drought and the necessary minimum precipitation can be expressed by an exponential equation. Values of the D index can express soil drought intensity and pasture drought intensity. The durations for different grades of drought events were correlated with both initial soil moisture and previous precipitation. The conclusions of this study can provide scientific references for the objective understanding onoccurrence, development, monitoring, and early warning of pasture drought.

Tiaofeng Zhang et al.

Interactive discussion

Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement

Interactive discussion

Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement

Tiaofeng Zhang et al.

Tiaofeng Zhang et al.

Viewed

Total article views: 571 (including HTML, PDF, and XML)
HTML PDF XML Total BibTeX EndNote
438 117 16 571 26 21
  • HTML: 438
  • PDF: 117
  • XML: 16
  • Total: 571
  • BibTeX: 26
  • EndNote: 21
Views and downloads (calculated since 17 Dec 2018)
Cumulative views and downloads (calculated since 17 Dec 2018)

Viewed (geographical distribution)

Total article views: 405 (including HTML, PDF, and XML) Thereof 404 with geography defined and 1 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 

Cited

Saved

No saved metrics found.

Discussed

No discussed metrics found.
Latest update: 27 Nov 2020
Publications Copernicus
Download
Short summary
Pasture is vital to livestock husbandry development in Qinghai and even in North China. Insufficient soil moisture is the most prominent cause of pasture drought. This study aims at investigating pasture responses to soil drought as well as quantitative expression of soil drought degree and drought threshold. Test plots were selected from the pasture test station. Five testing groups were set according to coverage rate (0–100 %) at the initiation the pasture growth period.
Pasture is vital to livestock husbandry development in Qinghai and even in North China....
Citation
Altmetrics