干旱区生态环境知识资源中心(Arid): Fractal features of sandy soil particle-size distributions during the rangeland desertification process on the eastern Qinghai-Tibet Plateau

Arid

DOI	10.1007/s11368-019-02392-6
	Fractal features of sandy soil particle-size distributions during the rangeland desertification process on the eastern Qinghai-Tibet Plateau
	Feng, Xiao 1,2; Qu, Jianjun1 ; Tan, Lihai 1; Fan, Qingbin 1,2; Niu, Qinghe 1
通讯作者	Qu, Jianjun
来源期刊	JOURNAL OF SOILS AND SEDIMENTS
ISSN	1439-0108
EISSN	1614-7480
出版年	2020
卷号	20 期号:1 页码:472-485
英文摘要	Purpose Fractal theory has been frequently applied to quantify soil particle-size distributions (PSDs) and evaluate soil degradation. Eolian desertification occurring on the eastern Qinghai-Tibet Plateau is threatening the ecological environment. It is essential to investigate the desertification process by adopting the concept of space as a substitute for time. Here, the fractal features of soil PSDs and their relationships with selected soil properties and wind erosion and deposition were studied. Materials and methods The tested soil samples were collected from rangelands with four different degrees of desertification (light, medium, severe, and extremely severe). Soil particle sizes were measured by a laser diffraction particle-size analyzer. Soil moisture and soil bulk density were determined by the soil weight difference before and after oven-drying for 8 h. Soil organic carbon was determined by the K2Cr2O7-H2SO4 oxidation method and soil total nitrogen was analyzed using the Kjeldahl digestion procedure. Wind tunnel experiments were conducted to simulate wind erosion and deposition during the desertification process. Values of the fractal dimension of soil PSDs were calculated using the volume-based fractal model. ANOVA with an LSD test and Pearson correlation analysis were used to analyze whether different parameters used in the fractal model influenced the results of the fractal dimensions and were reasonable to be applied. Results and discussion Different parameters, including the arithmetic mean size and the upper sieve size of two successive sieve sizes, values of R-min, and the number of data points used in the fractal model, rarely influenced the results of the fractal dimensions (p > 0.05). The D values showed a significantly positive correlation with the clay and silt contents and a strong negative correlation with the sand contents. Along the degrees of desertification from light to extremely severe, the contents of clay, silt, and very fine sand decreased while the fine sand contents increased, and the D values decreased accordingly. Rangelands with heavier desertification and lower D values were more easily exposed to wind erosion, relating to the further loss of soil organic carbon, soil total nitrogen, and soil moisture and increased soil bulk density. The soil depth could affect soil PSDs and the selected soil properties of rangelands under light and medium degrees of desertification but rarely influenced those of severely and extremely severely desertified lands. Conclusions Different parameters, including the arithmetic mean size, the upper sieve size, values of Rmin, and the number of data points used in the fractal model, had no impacts on the results of the fractal dimensions, and were reasonable to be applied. We suggest the fractal dimension as an effective indicator to evaluate soil environment changes induced by desertification.
英文关键词	Fractal dimension Desertification process Soil particle-size distributions Soil properties Wind erosion and deposition
类型	Article
语种	英语
国家	Peoples R China
收录类别	SCI-E
WOS记录号	WOS:000515824400041
WOS关键词	AEOLIAN DESERTIFICATION ; WIND EROSION ; ALPINE GRASSLAND ; NUTRIENT LOSS ; DIMENSION ; MODEL ; RIVER ; FRAGMENTATION ; FARMLAND ; CARBON
WOS类目	Environmental Sciences ; Soil Science
WOS研究方向	Environmental Sciences & Ecology ; Agriculture
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/315073
作者单位	1.Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Dunhuang Gobi Desert Res Stn, Lanzhou 730000, Peoples R China; 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Feng, Xiao,Qu, Jianjun,Tan, Lihai,et al. Fractal features of sandy soil particle-size distributions during the rangeland desertification process on the eastern Qinghai-Tibet Plateau[J],2020,20(1):472-485.
APA	Feng, Xiao,Qu, Jianjun,Tan, Lihai,Fan, Qingbin,&Niu, Qinghe.(2020).Fractal features of sandy soil particle-size distributions during the rangeland desertification process on the eastern Qinghai-Tibet Plateau.JOURNAL OF SOILS AND SEDIMENTS,20(1),472-485.
MLA	Feng, Xiao,et al."Fractal features of sandy soil particle-size distributions during the rangeland desertification process on the eastern Qinghai-Tibet Plateau".JOURNAL OF SOILS AND SEDIMENTS 20.1(2020):472-485.