红砂灌丛沙堆土壤粒度组成及养分积累特征

doi:10.13866/j.azr.2022.03.27

Abstract

Abstract:

Understanding the effects of desert shrubs on the soil structure and nutrient spatial heterogeneity of nebkhas is important for maintaining the stability of desert ecosystems and preventing regional desertification. In this study, soil grain-size composition and soil nutrient accumulation of Reaumuria soongorica in the steppe desert transition zone of Baiyinengel Nature Reserve, Hangjin Banner, Ordos City, were analyzed. (1) The soil was mainly fine sand (content ranging from 36.34% to 65.31%); the clay and silt content was less than 7.00%. (2) Reaumuria soongorica protects nebkhas from wind erosion and also plays a role in fixing quicksand. The sediment of nebkhas tended to be refined, and particle sorting became successively worse from the leeward side to the windward side and the open space between nebkhas. The particle distribution peak became wider and flatter, and the fractal dimension became smaller. The distribution of soil particle size composition in the shrub nebkha was more symmetrical than that in the open space between the mounds. (3) The soil organic matter (SOM), alkaline hydrolyzed nitrogen (AN), available phosphorus (AP), and available potassium (AK) contents on the windward and leeward sides of the nebkha increased by 29.37% and 40.63%, 23.49% and 35.12%, 62.72% and 66.45%, 30.10% and 22.75% (P<0.05), respectively, and RII (Relative Interaction Intense) > 0. Under the influence of wind erosion and plant feedback, nutrients were enriched in nebkhas, forming “fertile islands. ”

Key words: Reaumuria soongorica, nebkhas, soil mechanical composition, soil nutrient content

LI Xiaole,WEI Yajuan,DANG Xiaohong,DAI Yuzhi,ZHAI Bo,CHI Xu,WU Huimin. Soil mechanical composition and soil nutrient content of Reaumuria soongorica nebkhas[J].Arid Zone Research, 2022, 39(3): 933-942.

Figures/Tables 7

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References 37

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沙堆密度 /[个·（100m²）^-1]	灌丛形态特征参数					沙堆形态特征参数
沙堆密度 /[个·（100m²）^-1]	L_g/m	W_g/m	H_g/m	C/m		L_d/m	W_d/m	H_d/m	S_d/m²	V_d/m³
20.33±5.51	1.86±0.28	1.56±0.08	0.16±0.06	1.71±0.18		1.84±0.34	1.41±0.06	0.38±0.08	2.05±0.46	0.52±0.19

土壤类型	土层深度/cm	黏粒	粉粒	砂粒
土壤类型	土层深度/cm	黏粒	粉粒	极细砂	细砂	中砂	粗砂	极粗砂
迎风侧	0~5	1.32±0.11Ba	3.92±0.10Cb	8.35±0.12Bb	58.36±8.35Ba	19.54±0.52Ab	7.06±0.50Bb	1.45±0.58Bab
	5~10	0.39±0.34Bb	2.48±0.17Bc	5.61±0.55ABc	42.31±4.10Bb	24.85±2.18Aa	21.66±5.15Ba	2.70±1.25ABa
	10~15	1.27±0.25Aa	5.38±0.27Aa	10.34±0.19Ca	55.93±11.23Ba	17.46±1.27Ab	8.91±0.99ABb	0.71±0.16Bb
背风侧	0~5	2.11±0.18Ba	6.00±0.14Ba	16.24±8.58Aa	72.12±10.77Aa	1.22±0.36Cc	0.84±0.63Bc	1.45±0.62Ba
	5~10	1.47±0.10Aab	4.34±0.15Ab	7.55±0.13Ac	61.54±10.99Ab	16.00±1.01Ba	7.95±0.30Ca	1.16±0.33Ba
	10~15	1.02±0.57Aa	5.13±0.66Ab	13.07±4.20Ab	62.26±10.20Ab	9.79±0.53Cb	6.66±0.31Bb	2.04±0.81Aa
丘间空地	0~5	3.14±0.83Aa	6.87±0.66Aa	9.12±1.99Ba	24.57±5.85Cb	10.23±2.27Ba	34.76±6.75Aa	11.19±3.23Aa
	5~10	0.46±0.54Bb	2.05±1.02Bb	5.11±1.60Bb	31.82±10.33Bb	13.58±4.84Ba	35.83±10.35Aa	11.03±8.04Aa
	10~15	1.0±0.96Ab	6.17±0.80Aa	11.35±0.54Ba	52.63±1.29Ca	14.83±1.34Ba	11.77±2.53Ab	2.23±0.64Aa

粒度参数	迎风侧土层深度/cm			背风侧土层深度/cm			丘间空地土层深度/cm
粒度参数	0~5	5~10	10~15	0~5	5~10	10~15	0~5	5~10	10~15
d₀/Φ	2.47±0.03Ba	1.91±0.15Bb	2.53±0.06Ba	3.08±0.01Aa	2.53±0.03Ac	2.76±0.03Ab	1.78±0.31Cb	1.45±0.46Bb	2.47±0.10Ba
δ	1.04±0.02Bb	1.16±0.07Aa	1.14±0.03Ba	0.86±0.03Bb	1.05±0.02Ba	1.08±0.04Ba	2.05±0.21Aa	1.25±0.03Ab	1.27±0.08Ab
SK	0.04±0.02Aa	0.08±0.04Aa	0.03±0.01Aa	-0.28±0.03ABb	0.02±0.01Aa	0.05±0.03Aa	-0.42±0.03Bb	-0.26±0.02Ab	0.11±0.05Aa
K_g	1.43±0.05Aa	0.85±0.05Bb	1.39±0.17Aa	1.69±0.01Aa	1.76±0.06Aa	1.63±0.26Aa	1.12±0.23Ba	0.72±0.06Cb	1.31±0.14Aa
D	2.83±0.04ABa	2.49±0.08Bb	2.88±0.04Aa	2.94±0.11Aa	2.80±0.02Ab	2.91±0.02Aab	2.76±0.01Ba	2.37±0.25Bb	2.71±0.13Ba

Soil mechanical composition and soil nutrient content of Reaumuria soongorica nebkhas

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