Physical and chemical properties and fractal dimension distribution of soil under shrubs in the southern area of Tengger Dseart

doi:10.7522/j.issn.1000-694X.2020.00091

Journal of Desert Research ›› 2021, Vol. 41 ›› Issue (1): 209-218.DOI: 10.7522/j.issn.1000-694X.2020.00091

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Physical and chemical properties and fractal dimension distribution of soil under shrubs in the southern area of Tengger Dseart

Wenfan Wang^a^,^b^,^c(), Rentao Liu^a^,^b^,^c(), Zhixia Guo^a^,^b^,^c, Yonghong Feng^a^,^b^,^c, Jiayu Jiang^a^,^b^,^c

^a.College of Agriculture /, Ningxia University，Yinchuan 750000，China
^b.Breeding Base for State Key Laboratory of Land Degradation and Ecological Restoration in Northwestern China /, Ningxia University，Yinchuan 750000，China
^c.Key Laboratory for Restoration and Reconstruction of Degraded Ecosystem in Northwestern China of Ministry of Education, Ningxia University，Yinchuan 750000，China

Received:2020-07-08 Revised:2020-09-03 Online:2021-01-29 Published:2021-01-29
Contact: Rentao Liu

Abstract

Abstract:

Soil physical and chemical properties and fractal dimension distribution characteristics of different dune micro topography after sand fixation and shrub forest construction in Tengger Desert. Taking sand fixing shrub forest in Tengger Desert as the research object， the windward slope， dune crest and leeward slope of large， medium and small sand dunes were selected as the research sample plots. Through investigating the fractal characteristics of soil physical and chemical properties and soil particle size distribution in different sand dune micro topography， the influence of sand dune size and micro topography difference on soil physical and chemical properties and soil fractal dimension distribution of sand fixing shrub forest was clarified. The results showed that：（1） The soil moisture content and total carbon were significantly higher in the middle of leeward slope than in the dune crest； the soil bulk density in the middle of the windward slope， the dune crest and the bottom of the leeward slope is significantly higher than that in the middle of the leeward slope， while the bottom of the windward slope is in the middle； and the micro topography of sand dune had no significant effect on soil pH and electrical conductivity. Moreover， the soil bulk density of large and medium-sized sand dunes is significantly higher than that of small-sized sand dunes； the soil electrical conductivity of medium and small-sized sand dunes is significantly higher than that of large-sized sand dunes； and the size of sand dunes has no significant impact on soil moisture content， pH and total carbon distribution. （2） The content of soil silt（2-50 μm）was as follows： the bottom of windward slope > the bottom of leeward slope > the middle of windward slope > the dune crest， the content of soil very fine sand（50-100 μm）was significantly lower at the bottom of leeward slope than at the middle of windward slope and at the dune crest， the soil fine sand（100-250 μm）is higher at the dune crest than at the bottom of the windward slope and in the middle of the windward slope. Large and medium sand dunes are mainly composed of soil silt and very fine sand， while small sand dunes are mainly composed of soil fine sand. （3） The fractal dimension of soil is between 2.59-2.78， which shows that the bottom of windward slope is significantly higher than the bottom of leeward slope， the other three micro terrain habitats are in the middle， and the large dune is significantly higher than the middle dune， while the small dune is in the middle. （4） Correlation analysis shows that the higher the content of silt， the higher the soil conductivity and total carbon content； the higher the content of very fine sand， the lower the soil conductivity； the higher the content of fine sand， the lower the total carbon content. The more the content of fine sand， the larger the fractal dimension. The results show that the effects of different dune micro topography on soil physical and chemical properties and fractal dimension are different. Therefore， it is necessary to carry out plantation construction and ecological effect evaluation according to the dune size and micro topography.

Key words: Tengger Desert, physical and chemical properties of soil, fractal dimension, soil particle size distribution

CLC Number:

S153.6

Wenfan Wang, Rentao Liu, Zhixia Guo, Yonghong Feng, Jiayu Jiang. Physical and chemical properties and fractal dimension distribution of soil under shrubs in the southern area of Tengger Dseart[J]. Journal of Desert Research, 2021, 41(1): 209-218.

Figures/Tables 7

References 42

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因子	含水率	容重	pH	电导率	全碳	粉粒	极细砂	细砂	分形维数
沙丘大小	1.865	1.907	0.401	1.432	2.371	7.25^*	2.025	2.892^*	3.217^*
沙丘部位	2.886^*	1.032	0.412	18.345^*	3.218^*	18.697^*	7.398^*	12.856^*	10.865^*
大小×部位	1.219	2.632^*	0.727	0.737	1.352	0.499	1.330	1.089	0.928

因子	含水率	容重	pH	电导率	全碳	粉粒	极细砂	细砂	分形维数
沙丘大小	1.865	1.907	0.401	1.432	2.371	7.25^*	2.025	2.892^*	3.217^*
沙丘部位	2.886^*	1.032	0.412	18.345^*	3.218^*	18.697^*	7.398^*	12.856^*	10.865^*
大小×部位	1.219	2.632^*	0.727	0.737	1.352	0.499	1.330	1.089	0.928

沙丘大小	沙丘部位	粉粒 (2—50 μm）	极细砂 (50—100 μm）	细砂（100—250 μm）	分形维数
大	迎风坡底部	2.32±0.12^bc	87.56±0.54^a	10.13±0.56^bc	2.78±0.10^a
大	迎风坡中部	1.53±0.40^bc	87.79±0.21^a	10.68±0.60^bc	2.72±0.02^ab
	丘顶	0.72±0.16^c	85.74±1.33^a	13.53±1.48^bc	2.76±0.01^ab
	背风坡中部	2.72±1.07^b	87.29±0.97^a	9.99±0.33^bc	2.68±0.04^ab
	背风坡底部	2.89±1.03^b	85.84±0.92^ab	11.27±0.38^bc	2.67±0.04^bc
中	迎风坡底部	5.21±0.63^a	84.63±1.28^ab	10.16±0.70^bc	2.59±0.02^c
中	迎风坡中部	2.99±0.59^bc	87.64±0.60^a	9.37±0.13^c	2.66±0.02^bc
	丘顶	2.24±0.39^bc	86.58±1.09^a	11.18±0.86^bc	2.68±0.02^bc
	背风坡中部	3.70±1.07^ab	84.75±0.98^ab	11.55±1.36^bc	2.64±0.03^bc
	背风坡底部	4.89±0.66^a	81.97±1.82^b	13.13±1.62^bc	2.60±0.02^c
小	迎风坡底部	2.15±0.30^bc	83.68±1.53^ab	14.17±1.78^b	2.69±0.01^ab
小	迎风坡中部	1.39±0.21^c	84.80±1.25^ab	13.80±1.46^b	2.72±0.01^ab
	丘顶	0.55±0.06^c	81.50±1.86^b	17.96±1.91^a	2.77±0.00^ab
	背风坡中部	1.98±0.37^bc	84.72±1.22^ab	13.30±1.51^bc	2.70±0.01^ab
	背风坡底部	2.26±0.31^bc	84.20±1.94^ab	13.54±1.76^bc	2.68±0.01^bc

沙丘大小	沙丘部位	粉粒 (2—50 μm）	极细砂 (50—100 μm）	细砂（100—250 μm）	分形维数
大	迎风坡底部	2.32±0.12^bc	87.56±0.54^a	10.13±0.56^bc	2.78±0.10^a
大	迎风坡中部	1.53±0.40^bc	87.79±0.21^a	10.68±0.60^bc	2.72±0.02^ab
	丘顶	0.72±0.16^c	85.74±1.33^a	13.53±1.48^bc	2.76±0.01^ab
	背风坡中部	2.72±1.07^b	87.29±0.97^a	9.99±0.33^bc	2.68±0.04^ab
	背风坡底部	2.89±1.03^b	85.84±0.92^ab	11.27±0.38^bc	2.67±0.04^bc
中	迎风坡底部	5.21±0.63^a	84.63±1.28^ab	10.16±0.70^bc	2.59±0.02^c
中	迎风坡中部	2.99±0.59^bc	87.64±0.60^a	9.37±0.13^c	2.66±0.02^bc
	丘顶	2.24±0.39^bc	86.58±1.09^a	11.18±0.86^bc	2.68±0.02^bc
	背风坡中部	3.70±1.07^ab	84.75±0.98^ab	11.55±1.36^bc	2.64±0.03^bc
	背风坡底部	4.89±0.66^a	81.97±1.82^b	13.13±1.62^bc	2.60±0.02^c
小	迎风坡底部	2.15±0.30^bc	83.68±1.53^ab	14.17±1.78^b	2.69±0.01^ab
小	迎风坡中部	1.39±0.21^c	84.80±1.25^ab	13.80±1.46^b	2.72±0.01^ab
	丘顶	0.55±0.06^c	81.50±1.86^b	17.96±1.91^a	2.77±0.00^ab
	背风坡中部	1.98±0.37^bc	84.72±1.22^ab	13.30±1.51^bc	2.70±0.01^ab
	背风坡底部	2.26±0.31^bc	84.20±1.94^ab	13.54±1.76^bc	2.68±0.01^bc

土壤颗粒	含水率	容重	pH	电导率	全碳
粉粒 (2—50 μm）	-0.047	0.083	0.057	0.346^*	0.692^**
极细砂（50—100 μm）	-0.099	-0.039	0.137	-0.367^*	-0.064
细砂（100—250 μm）	0.210	0.035	-0.125	0.097	-0.305^*

Physical and chemical properties and fractal dimension distribution of soil under shrubs in the southern area of Tengger Dseart

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