西鄂尔多斯珍稀濒危沙冬青及伴生种对土壤特征的影响

doi:10.13866/j.azr.2023.05.09

Abstract

Abstract:

This study was conducted to explore the influence of desert shrubs and their associated species on soil particle size and nutrient spatial heterogeneity under shrubs. The mixed community of Ammopiptanthus mongolicus and Sarcozygium xanthoxylon and a single plant of A. mongolicus in the Western Ordos National Nature Reserve were selected as the research samples. The surrounding bare sandy land without vegetation cover was used as control. The soil particle size characteristics, nutrient accumulation changes, and the relationship between nutrients and particle size composition under different shrub distribution types were analyzed. The results were as follows: (1) Compared with the mixed community of A. mongolicus-S. xanthoxylon, the volume percentages of soil clay, silt, and fine sand of the single A. mongolicus increased by 0.8%, 0.8%, and 0.71%, respectively. As the types of shrubs decrease, soil particle size became smaller in turn, sorting deteriorated, the fractal dimension became smaller, the soil particle distribution gradually became asymmetric, and the particle composition was concentrated at fine particles. (2) The contents of soil organic matter and alkali-hydrolyzable nitrogen increased by 1.85 g·kg^-1 and 8.18 g·kg^-1, respectively, with the increase in shrub species. The accumulation of organic matter and available phosphorus by a single A. mongolicus was stronger than that by A. mongolicus-S. xanthoxylon; however, the accumulation of alkali-hydrolyzable nitrogen was slightly poor than that of A. mongolicus-S. xanthoxylon. (3) A. mongolicus-S. xanthoxylon available soil phosphorus content was significantly positively correlated with fine sand content (P<0.05), and A. mongolicus available soil nitrogen and potassium were significantly positively correlated with coarse sand (P<0.05). A. mongolicus-S. xanthoxylon can effectively promote soil granulation and significantly improve soil nutrients. However, the presence of the associated species S. xanthoxylon reduced the enrichment of organic matter and available phosphorus by A. mongolicus.

Key words: soil mechanical composition, nutrient enrichment, relict plant, west Ordos region

WU Huimin, DANG Xiaohong, ZHAI Bo, WEI Yajuan, LI Xiaole. Effects of rare and endangered Ammopiptanthus mongolicus and associated species on soil characteristics in western Ordos[J].Arid Zone Research, 2023, 40(5): 767-776.

Figures/Tables 7

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Tab. 1

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物种名称	类型	数量/株	平均株高/cm	平均冠幅/cm
沙冬青	单生	29	64.59±5.35b	156.83±11.31b
沙冬青	混生	83	69.89±10.47b	198.37±19.16a
霸王	单生	85	84.54±4.21a	166.00±13.93b
霸王	混生	83	90.24±4.41a	179.72±4.41ab

样地	土层/cm	黏粒	粉粒	砂粒
样地	土层/cm	黏粒	粉粒	极细砂	细砂	中砂	粗砂	极粗砂
沙冬青-霸王	0~5	6.52±0.31Bc	3.85±0.09Ba	8.57±0.23Aa	52.64±1.39Ab	16.27±0.37Bd	9.85±1.24Bab	2.29±0.54Aa
	5~10	9.71±0.38Aa	3.80±0.24Ba	5.95±0.26Bb	50.06±0.94Bc	21.45±0.30Ab	8.29±0.77Bab	0.74±0.15Ab
	10~20	8.16±0.44Bb	3.83±0.22Ba	4.68±0.22Cc	48.95±1.45Ac	22.48±0.22Aa	10.54±1.31Ba	1.36±0.50Bab
	20~30	5.94±0.35Cc	3.31±0.15Cb	6.17±0.25Bb	56.60±1.60Ca	18.96±0.03Ac	7.56±1.32Ab	1.47±0.35Aab
沙冬青	0~5	8.71±0.47Ab	4.23±0.22Bb	6.60±0.18Bb	45.71±1.50Bd	19.69±0.18Aa	13.29±1.80Aa	1.77±0.08Aa
	5~10	7.41±0.27Bc	4.19±0.18Ab	9.00±0.16Aa	53.62±0.36Ab	14.41±0.21Cc	9.67±1.09Bb	1.68±0.99Aa
	10~20	10.36±0.54Aa	5.52±0.37Aa	6.37±0.28Bb	50.42±0.93Ac	17.47±0.57Bb	9.04±1.44Bb	0.81±0.42Ba
	20~30	7.06±0.34Bc	4.06±0.08Bb	5.09±0.16Cc	61.33±0.21Ba	17.02±0.55Bb	4.07±0.17Bc	1.36±0.39Aa
裸沙地	0~5	8.97±0.79Aa	5.20±0.38Ab	6.70±0.33Bc	52.05±1.61Ab	15.84±1.13Bb	7.58±1.26Bc	3.64±2.37Aab
	5~10	8.12±0.58Bab	3.56±0.29Bc	6.37±0.36Bc	49.99±1.32Bb	18.75±0.65Ba	11.80±0.83Ab	1.41±0.84Abc
	10~20	7.30±0.52Bb	3.10±0.44Cc	7.39±0.34Ab	44.25±3.11Bc	14.74±1.46Cb	16.38±2.23Aa	6.78±2.39Aa
	20~30	8.18±0.59Aab	6.64±0.20Aa	9.30±0.09Aa	62.11±1.55Aa	9.69±1.05Cc	2.89±0.61Cd	1.18±0.05Bbc

样地	土层/cm	平均粒径（d₀）
沙冬青-霸王	0~5	2.51± 0.40Aa	1.38±0.23Aab	-0.08±0.04Aa	1.46± 0.37Aa	2.88±0.02Aa
	5~10	2.48± 0.38Aa	1.59± 0.07Aa	-0.31±0.04Aa	1.67± 0.25Aa	2.88±0.13Aa
	10~20	2.47± 0.08Ba	1.56± 0.10Ca	0.09± 0.02Aa	1.69± 0.16Ba	2.96±0.01Aa
	20~30	2.48± 0.15Ba	1.27± 0.13Ab	0.09± 0.03Aa	1.25± 0.22Aa	2.96± 0.03Aa
沙冬青	0~5	2.39± 0.26Ab	1.68± 0.21Aa	0.26± 0.09Aa	1.96± 0.57Aa	2.93±0.04Aab
	5~10	2.67±0.16Aab	1.53± 0.08Aa	-0.12±0.05Aa	1.68± 0.19Aa	2.84±0.10Ab
	10~20	2.83± 0.09Aa	1.76± 0.05Ba	-0.07±0.02Aa	2.00±0.04ABa	2.92±0.04Aab
	20~30	2.59±0.09Bab	1.28± 0.04Ab	0.40± 0.06Aa	1.38± 0.16Aa	2.95± 0.02Aa
裸沙地	0~5	2.73± 0.10Ab	1.76± 0.06Ab	0.22± 0.05Aa	1.96± 0.09Ab	2.92± 0.06Aa
	5~10	2.51± 0.03Ac	1.65± 0.05Ab	0.20± 0.03Aa	1.90± 0.06Ab	2.84± 0.18Aa
	10~20	2.10± 0.07Cd	1.94± 0.10Aa	-0.20±0.06Aa	3.09± 0.96Aa	2.81± 0.22Aa
	20~30	3.03± 0.00Aa	1.33± 0.05Ac	-0.19±0.07Aa	1.28± 0.09Ab	2.80± 0.21Aa

Effects of rare and endangered Ammopiptanthus mongolicus and associated species on soil characteristics in western Ordos

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