沙化草地恢复中小叶锦鸡儿对植被和土壤的影响

doi:10.13866/j.azr.2024.11.08

Abstract

Abstract:

Caragana microphylla, a shrub species commonly used to promote vegetation recovery in grasslands affected by desertification, plays a significant role in the ecological restoration and sustainable development of sandy lands. Understanding its impact on understory vegetation and soil physicochemical characteristics during different stages of desertified grassland recovery is crucial. This study focuses on C. microphylla shrublands in three typical stages of desertified grassland vegetation recovery in the Hulun Buir sandy land: semi-fixed, fixed, and sandy grasslands. This study used ANOVA, Pearson’s correlation analysis, and redundancy analysis methods to explore the changes in understory plant communities and soil physicochemical characteristics in C. microphylla shrublands during different stages of desertified grassland vegetation recovery and their interrelationships. The results indicate that, as the degree of vegetation recovery in desertified grasslands increases, the species richness of the understory vegetation, Shannon-Wiener index, community height, and biomass also increase. The community height and biomass within the shrublands are higher than outside, with species richness within the shrublands being higher than outside during the semi-fixed and fixed sandland stages. In the 0-10 cm and 10-20 cm soil layers, SWC displays an increasing trend, peaking in the sandy grassland stage (1.2%), and is higher within the shrublands than outside. The SWC at 10-20 cm is higher at 0-10 cm. In both layers, clay and silt content gradually increases with the degree of vegetation recovery in the sandy land and is higher within the shrublands than outside, while the opposite is true for sand content. In both soil layers, SOC gradually increases with the degree of vegetation recovery, peaking in the sandy grassland stage (4.12 g·kg^-1) and is higher within the shrublands than outside. TN increases from the semi-fixed to the fixed sand land stage, with higher levels within the shrublands than outside at all stages. Soil pH within the shrublands decreases as the degree of vegetation recovery increases. No significant change in TP is observed. Additionally, soil physicochemical characteristics account for 59.6% and 46.9% of the vegetation changes in both soil layers within and outside the shrublands, respectively, with the main influencing factors being soil particle size, TN, SWC, and SOC. This study demonstrates that during vegetation recovery in desertified grasslands, C. microphylla shrublands promote vegetation growth and development by improving the soil physicochemical characteristics under the shrublands, including soil particle size, SWC, SOC, and TN.

Key words: desertified grassland vegetation recovery, Caragana microphylla, vegetation characteristics, soil physicochemical characteristics, Hulun Buir

ZHU Tiantian, HAI Lu, CAO Wenxu, LI Xu, LI Qinghe. Effects of Caragana microphylla on vegetation and soil in the restoration of desertified grasslands[J].Arid Zone Research, 2024, 41(11): 1875-1886.

Figures/Tables 9

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References 35

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恢复阶段	长度/cm	宽度/cm	高度/cm	林下植被盖度/%
半固定沙地	118.5±16.04b	89.70±19.87b	112.13±13.76a	25.2±8.21c
固定沙地	161±23.55a	131.17±23.70a	150.53±41.49a	48.5±10.54b
沙质草地	122.12±22.12b	98.27±27.93b	149.00±36.30b	83.5±4.57a

因素	df	丰富度		香农-威纳指数		群落高度		生物量
因素	df	F	P	F	P	F	P	F	P
恢复阶段	2	172.61	<0.01	58.49	<0.001	159.35	<0.01	277.37	<0.01
灌丛内外	1	46.61	<0.01	1.34	0.25	319.62	<0.01	295.08	<0.01
恢复阶段×灌丛内外	2	41.03	<0.01	2.36	0.10	0.58	0.56	72.48	<0.01

因素	df	土壤含水率		黏粒		粉粒		沙粒
因素	df	F	P	F	P	F	P	F	P
恢复阶段	2	71.58	<0.01	87.24	<0.01	66.97	<0.01	132.85	<0.01
灌丛内外	1	91.83	<0.01	19.19	<0.01	71.96	<0.01	93.75	<0.01
土层	1	13.91	<0.01	8.39	<0.01	15.17	<0.01	25.77	<0.01
恢复阶段×灌丛内外	2	0.29	0.74	8.02	<0.01	6.27	<0.01	14.12	<0.01
恢复阶段×土层	2	1.40	0.25	1.46	0.24	2.56	0.08	2.46	0.09
灌丛内外×土层	1	0.13	0.72	0.06	0.81	8.39	<0.01	5.24	<0.05
恢复阶段×灌丛内外×土层	2	1.61	0.20	0.64	0.53	3.54	<0.05	2.31	0.10

因素	df	有机碳		全氮		全磷		pH
因素	df	F	P	F	P	F	P	F	P
恢复阶段	2	59.029	<0.01	23.535	<0.01	1.89	0.15	48.28	<0.01
灌丛内外	1	15.829	<0.01	133.738	<0.01	0.07	0.79	48.08	<0.01
土层	1	6.135	<0.05	5.503	<0.05	7.83	<0.01	6.465	<0.05
恢复阶段×灌丛内外	2	3.581	<0.05	2.454	0.09	18.53	<0.01	50.64	<0.01
恢复阶段×土层	2	1.090	0.34	7.525	<0.01	3.11	<0.05	2.204	0.11
灌丛内外×土层	1	0.964	0.33	0.009	0.93	1.77	0.19	1.746	0.19
恢复阶段×灌丛内外×土层	2	0.353	0.70	19.987	<0.01	3.077	<0.05	1.898	0.15

Effects of Caragana microphylla on vegetation and soil in the restoration of desertified grasslands

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