Dust emission from different land use types based on the PI-SWERL test

IF 5.4 1区 农林科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY
Yong Wang , Ping Yan , Yijiao Wang , Xiaoxu Wang , Wei Wu , Miao Dong
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Abstract

Dust emissions have important impacts on the ecological environment and air quality. To explore the underlying mechanisms, characteristics and influence factors of the dust emission from different land use types along the northern dust transport path of Beijing, a portable dust observation instrument (PI-SWERL) was used to test the dust emissions from typical land use types in both the leapfrog mode and progressive mode. The results showed that in the leapfrog mode, the dust emission concentrations (DECs) of the different land use types exhibited four patterns with increasing friction wind speed: fluctuation type, fluctuating growth type, linear growth type and growth stability type. In the progressive mode, the instantaneous dust emission fluxes (IDEFs) from the different land use types under the same friction wind speed exhibited three variation characteristics with increasing erosion time: rapid decline, decline after stabilization, and remaining stable. These variation characteristics preliminarily reflected the dust emission mechanisms and emission potentials of the different land use types. For different land types, the DEFs of grassland after crust destruction (GCD) and vineyard land (VL) were the largest, and the maximum value reached 14 mg/m2·s at a friction wind speed of 0.69 m/s. The DEFs of grassland (TS), stubble land (StL), saline-alkali land (SAL), shrubland (ShL) and grassland with crust (GC) were the lowest, with maximum DEFs of less than 0.3 mg/m2·s. The differences in dust emissions from different land types were mainly affected by the topsoil dust content, soil crust, surface vegetation and human disturbance. Under the influence of various factors, the DEFs of plowed land were 3.62–8.36 times greater than those of unplowed land and 81.78–175.50 times greater than those of grassland at friction wind speeds of 0.39, 0.55 and 0.69 m/s. The DEFs of land after removing stubble were 36.34–164.86 times greater than those of stubble land, and the DEFs of grassland after crust destruction were 50.50–195.25 times greater than those of grassland with crust. In this study, the PI-SWERL dust tests have important reference significance for analyzing dust emission mechanisms, characteristics, potential and effects of human disturbance in different land use types.
基于PI-SWERL试验的不同土地利用类型扬尘排放
扬尘排放对生态环境和空气质量有重要影响。为探讨北京市北部扬尘输送路径上不同土地利用类型的扬尘排放机理、特征及影响因素,利用便携式扬尘观测仪器(PI-SWERL)对典型土地利用类型在跨越模式和递进模式下的扬尘排放进行了测试。结果表明:在跨越式模式下,随着摩擦风速的增加,不同土地利用类型的沙尘排放浓度(DECs)表现为波动型、波动生长型、线性生长型和生长稳定型4种模式;在递进模式下,相同摩擦风速下不同土地利用类型瞬时粉尘排放通量随侵蚀时间的增加呈现出快速下降、稳定后下降和保持稳定的3种变化特征。这些变化特征初步反映了不同土地利用类型的扬尘排放机制和排放潜力。不同土地类型中,结皮破坏后草地(GCD)和葡萄园地(VL)的DEFs最大,在0.69 m/s的摩擦风速下,DEFs最大值为14 mg/m2·s。草地(TS)、残茬地(StL)、盐碱地(SAL)、灌丛地(ShL)和结皮草地(GC)的DEFs最低,最大DEFs均小于0.3 mg/m2·s。不同土地类型的沙尘排放差异主要受表土含沙量、土壤结皮、地表植被和人为干扰的影响。在各因素的影响下,在0.39、0.55和0.69 m/s的摩擦风速下,耕地的DEFs是未耕地的3.62 ~ 8.36倍,是草地的81.78 ~ 175.50倍。除残茬后土地的DEFs是残茬土地的36.34 ~ 164.86倍,结皮破坏后草地的DEFs是有结皮草地的50.50 ~ 195.25倍。在本研究中,PI-SWERL粉尘试验对分析不同土地利用类型的粉尘排放机理、特征、潜力和人为干扰效应具有重要的参考意义。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Catena
Catena 环境科学-地球科学综合
CiteScore
10.50
自引率
9.70%
发文量
816
审稿时长
54 days
期刊介绍: Catena publishes papers describing original field and laboratory investigations and reviews on geoecology and landscape evolution with emphasis on interdisciplinary aspects of soil science, hydrology and geomorphology. It aims to disseminate new knowledge and foster better understanding of the physical environment, of evolutionary sequences that have resulted in past and current landscapes, and of the natural processes that are likely to determine the fate of our terrestrial environment. Papers within any one of the above topics are welcome provided they are of sufficiently wide interest and relevance.
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