内蒙古清水河县典型人工植被土壤碳氮磷及其化学计量特征

doi:10.12118/j.issn.1000-6060.2024.700

Abstract

Abstract:

The stoichiometric relationship of carbon (C), nitrogen (N), and phosphorus (P) in soil is crucial for understanding the ecological function of different vegetation types. This study examined four typical artificial vegetation types (Populus L., Pinus sylvestris, Pinus tabulaeformis, and Caragana korshinskii) in Qingshuihe County, Inner Mongolia, China, with natural gramineous grassland as the control. The concentrations of soil C, N, and P along with their stoichiometric ratios, within the 0-100-cm soil profile, were investigated. The key results were as follows. (1) In the surface-soil layer (0-20 cm), C, N, and P levels across the five vegetation types were 3.29-6.02 g·kg⁻¹, 0.52-0.69 g·kg⁻¹, and 0.37-0.62 g·kg⁻¹, respectively. Soil C and N levels were below the national surface-soil average, indicating poor soil fertility. (2) In the 0-20 cm layer, soils under artificial vegetation had lower C content, N levels, and C/N ratios compared with those under grassland, with significantly lower C and C/N observed in P. sylvestris and C. korshinskii (P<0.05). At depths of 20-50 cm and 50-100 cm, C and N levels were highest under grassland and lower under artificial vegetation, with P. sylvestris showing the lowest C/N ratio. Soil P content was significantly higher under artificial vegetation than those under grassland at all depths, whereas C/P and N/P ratios were significantly lower than those under grassland. (3) Correlation analysis revealed strong positive relationships between soil C and N and between C/P and N/P (P<0.001). Soil C, N, and P levels were significantly affected by vegetation type and soil depth (P<0.001) and all decreased with increasing depth, indicating strong surface accumulation. Given the high soil phosphorus availability in the study area, which supports the growth of herbaceous vegetation, and the superior soil nutrient conservation capacity of herbaceous plants relative to artificial irrigated vegetation, ecological restoration efforts in this region should primarily focus on conserving and restoring native herbaceous vegetation. This study contributes to understanding the soil nutrient cycle, assessing the ecological benefits of different vegetation types, and providing a scientific basis for regional ecological restoration and resource management.

Key words: artificial vegetation, natural grassland, soil nutrients, ecological stoichiometry

MIN Xue, WU Yeli, ZHANG Ying, DING Guodong, YANG Zhiheng. Soil carbon, nitrogen and phosphorus stoichiometric characteristics of typical artificial vegetation in Qingshuihe County, Inner Mongolia[J].Arid Land Geography, 2025, 48(8): 1492-1501.

Figures/Tables 6

Tab. 1

Fig. 1

Tab. 2

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References 38

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植被类型	平均经纬度	建植年份	平均坡向	平均坡度/(°)	平均海拔/m	植被盖度/%	容重/g·cm^-3	枯落物量/t·hm^-2
杨树	111.83°E，39.86°N	2001	东北	9	1385	61	1.04±0.02	2.38±0.69
油松	111.74°E，39.85°N	2001	西北	12	1407	70	1.03±0.03	1.28±0.31
樟子松	111.72°E，39.80°N	2001	西南	10	1460	78	0.98±0.05	1.12±0.21
柠条锦鸡儿	111.74°E，39.34°N	2001	西南	10	1253	57	1.10±0.02	0.82±0.34
禾草草地	111.77°E，39.86°N	-	西北	10	1356	75	1.01±0.02	0.70±0.07

因素	C	N	P	C/N	C/P	N/P
植被类型	8.556^***	5.775^***	10.138^***	4.446^**	8.161^***	8.174^***
土壤深度	18.741^***	22.106^***	12.872^***	0.723	0.707	0.239
植被类型×土壤深度	0.417	0.234	0.598	0.486	0.042	0.399

指标	SLO	ASL	BD	C	N	P	C/N	C/P	N/P
SLO	1.000
ASL	-0.210^*	1.000
BD	0.099	-0.508^***	1.000
C	-0.126	0.216^*	-0.312^***	1.000
N	-0.193^*	0.166	-0.339^***	0.748^***	1.000
P	0.098	0.265^**	-0.124	0.270^**	0.177	1.000
C/N	-0.040	0.176	-0.102	0.612^***	0.000	0.182	1.000
C/P	-0.183^*	-0.015	-0.131	0.528^***	0.428^***	-0.375^***	0.319^***	1.000
N/P	-0.193	-0.053	-0.137	0.236^*	0.458^***	-0.510^***	-0.132	0.854^***	1.000

Soil carbon, nitrogen and phosphorus stoichiometric characteristics of typical artificial vegetation in Qingshuihe County, Inner Mongolia

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