Changes of soil wind erodibility for farmland in different time scales

doi:10.7522/j.issn.1000-694X.2021.00078

Journal of Desert Research ›› 2021, Vol. 41 ›› Issue (5): 202-209.DOI: 10.7522/j.issn.1000-694X.2021.00078

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Changes of soil wind erodibility for farmland in different time scales

Rende Wang¹(), Chenyu An², Yixiao Yuan³, Chunlai Zhang³, Qing Li¹, Huimin Zha¹, Chunping Chang², Zhongling Guo²

^1.Institute of Geographical Sciences / Hebei Engineering Research Center for Geographic Information Application，Heibei Academy Sciences，Shijiazhuang 050011，China
^2.College of Resource and Environment Sciences / Hebei Key Laboratory of Environmental Change and Ecological Construction，Hebei Normal University，Shijiazhuang 050024，China
^3.State Key Laboratory of Earth Surface Processes and Resource Ecology / MOE Engineering Research Center of Desertification and Blown-Sand Control，Faculty of Geographical Science，Beijing Normal University，Beijing 100875，China

Received:2021-06-16 Revised:2021-06-25 Online:2021-09-20 Published:2021-09-23

Abstract

Abstract:

Soil wind erodibility （simplified as soil erodibility）， as one of the necessary input parameters in wind erosion models， changes significantly with the process of wind erosion events， tillage measurements， weather and climate factors， but its changing trend is still unclear until now. In this paper， by field observation， sampling analysis and space time exchange methods， the changes of farmland soil erodibility in Bashang district were studied under four time scales： wind erosion event， wind erosion month， wind erosion season and many years. The results showed that from the pre （stage） to post （stage） of the wind erosion event， the content of dry aggregate particles with diameter <0.85 mm in surface soil decreased significantly， and the threshold friction velocity increased significantly， and the sediment transporting rate decreased significantly， which all proved that the soil erodibility decreased significantly. In the time scales of wind erosion month， wind erosion season and many years， the soil erodibility for farmland， especially for ploughed farmland， showed a downward trend， and the longer the time scale， the larger the declining range of the soil erodibility. The strong wind erosion in Bashang district may be the main reason for the decline of farmland soil erodibility under different time scales. In order to reduce the damage of farmland wind erosion in Bashang district， reclamation of new farmland should be reduced as far as possible and ploughing should be avoided in the high incidence period of wind erosion events.

Key words: soil wind erodibility, threshold friction velocity, sand transporting rate, time scale, farmland

CLC Number:

X169

Rende Wang, Chenyu An, Yixiao Yuan, Chunlai Zhang, Qing Li, Huimin Zha, Chunping Chang, Zhongling Guo. Changes of soil wind erodibility for farmland in different time scales[J]. Journal of Desert Research, 2021, 41(5): 202-209.

Figures/Tables 6

Fig.1 Locations of study area （A）and sampling points （B）

Fig.2 Changing process of friction velocity and sand transporting rate in a wind erosion event

Fig.3 Change of farmland soil erodibility from the pre to post of a wind erosion event

Fig.4 Change of farmland soil erodibility in wind erosion reason

Fig.5 Change of soil erodibility for plaughed and raked fields in wind erosion month

Fig.6 Comparison of soil erodibility between farmlands and nearby natural grasslands

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Changes of soil wind erodibility for farmland in different time scales

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