油蒿与沙柳灌木地藓结皮发育差异研究

doi:10.13866/j.azr.2023.06.13

Abstract

Abstract:

The soil properties and moss crust development indices in typical Artemisia ordosica and Salix pasmmophia shrub land plots in the sandy area of Mu Us Sandland have previously been analyzed in combination with allelopathic tests of the extracts from the different shrub organs. The results showed that moss crust development in A. ordosica shrub land was better than that in S. pasmmophia shrub land, but the reason is unclear, and elucidating it is the aim of this investigation. A significant difference in the moss crust coverage between the two kinds of shrubs (P < 0.05) was identified. The total moss crust coverage and sub-canopy and inter-canopy crust coverage were as follows: A. ordosica > S. pasmmophia, and the total moss crust coverage and subcanopy and intercanopy crust coverage in the A. ordosica shrub land were 1.6, 2.9, and 1.1 times higher than those in the sand S. pasmmophia shrub land, respectively. Furthermore, there was no significant difference in moss crust thickness between the two kinds of shrubs (P > 0.05). Pearson correlation analysis showed that the moss crust coverage in the sub-canopy was significantly positively correlated with the soil water content, moss crust thickness in the sub-canopy was significantly positively correlated with silt content, and inter-canopy moss crust coverage was significantly positively correlated with soil water and clay content (P < 0.05). The higher soil water, clay, and silt contents in the A. ordosica shrub land promoted the development of moss crusts. The aqueous extracts from the roots, stems, and leaves of the A. ordosica and S. pasmmophia inhibited the development of moss crusts; that is, the allelopathic synthesis effect (SE) was negative. Specifically, the allelopathic inhibitory effect of the 0.2 g·mL^-1 aqueous extract of the S. pasmmophia leaves was the strongest, with an SE of -0.95. The inhibitory effect was significantly higher than that of the A. ordosica leaves (SE = -0.65). It can be inferred from the results that the higher soil water, clay, and silt contents in the A. ordosica shrub land and the significant allelopathic inhibition of the S. pasmmophia leaves on the moss crusts led to the improved development of moss crusts in A. ordosica shrub land when compared with S. pasmmophia shrub land.

Key words: Artemisia ordosica, Salix pasmmophia, moss crusts, allelopathy, comparative research, Mu Us Sandland

MO Qiuxia, SONG Wei, BU Chongfeng, WANG Chun, WANG Heming, LI Yahong. Differences in moss crust development between Artemisia ordosica and Salix pasmmophia shrubs[J].Arid Zone Research, 2023, 40(6): 979-987.

Figures/Tables 9

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References 35

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灌木类型	植被盖度/%	株高/cm
油蒿	35.00±2.08a	59.00±1.86a
沙柳	45.00±3.79a	223.00±6.17a

灌木类型	全氮/(g·kg^-1)	全磷/(g·kg^-1)	有机质/(g·kg^-1)	含水率/%	pH	黏粒/%	粉粒/%	细砂/%	粗砂/%
油蒿	0.03±0.01a	0.15±0.01a	1.33±0.22a	1.62±0.09a	8.59±0.16a	2.21±038a	5.52±0.77a	34.84±1.13a	58.01±1.61a
沙柳	0.04±0.01a	0.20±0.01a	0.81±0.08a	1.38±0.10a	8.70±0.09a	2.54±0.16a	5.09±0.95a	35.45±0.53a	56..36±1.48a

浓度/(g·mL^-1)	灌木类型
浓度/(g·mL^-1)	油蒿			沙柳
0.00	根	茎	叶	根	茎	叶
0.02
0.20

样地类型	结皮厚度/mm	结皮盖度/%
油蒿	11.33±0.41a	88.62±0.74a
沙柳	10.84±0.31a	55.87±1.33b

样地类型		结皮厚度/mm	结皮盖度/%
冠层下	油蒿	12.22±0.41a	85.56±0.52a
冠层下	沙柳	11.11±0.43a	29.52±3.30b
冠层间	油蒿	10.44±0.41a	91.67±1.02a
冠层间	沙柳	10.56±0.85a	82.22±1.11b

Differences in moss crust development between Artemisia ordosica and Salix pasmmophia shrubs

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土壤理化性状	冠层下		冠层间
土壤理化性状	油蒿	沙柳	油蒿	沙柳
全氮/(g·kg^-1)	0.27±0.03a	0.33±0.03a	0.19±0.02a	0.23±0.03a
全磷/(g·kg^-1)	0.30±0.03a	0.34±0.02a	0.28±0.02a	0.33±0.02a
有机质/(g·kg^-1)	5.67±0.43a	7.13±0.92a	4.05±0.37a	4.79±0.57a
含水率/%	3.80±0.17a	2.70±0.06b	4.70±0.09a	3.10±0.12b
pH	8.54±0.04a	8.43±0.01a	8.72±0.03a	8.61±0.07a
黏粒/%	3.80±0.32a	3.60±0.28a	6.40±0.40a	3.00±0.43b
粉粒/%	10.50±0.87a	9.40±0.62a	13.60±1.42a	8.40±0.85b
细砂/%	66.90±3.52a	69.20±1.30a	54.60±2.63b	66.10±2.14a
粗砂/%	19.00±4.68a	17.70±0.58a	25.40±3.41a	22.40±2.09a

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