新疆北部六种草地类型土壤碳氮磷生态化学计量特征

doi:10.13866/j.azr.2024.10.09

Abstract

Abstract:

Spatial variations in soil carbon, nitrogen, and phosphorus concentrations, as well as their ecological stoichiometry, in grasslands are related to the function and stability of grassland ecosystems. The Irtysh River Basin exhibits a significant disparity in altitude, remarkable climate variation, and diverse grassland types that display a vertical zonal distribution. Nevertheless, there are no clear data on the influence of altitude, climate, soil properties, and vegetation on the spatial patterns of soil carbon, nitrogen, and phosphorus stoichiometry in the Irtysh River Basin, which is a typical pastoral area in Xinjiang. Therefore, this study investigated 65 sample points from six main grassland types (temperate desert, temperate desert steppe, temperate steppe, temperate meadow steppe, mountain meadow, and alpine meadow) in the Irtysh River Basin at depths of 0-10 and 10-20 cm. The following results were obtained: (1) The soil organic carbon (39.06-62.59 g·kg^-1), total nitrogen (3.87-6.95 g·kg^-1), and total phosphorus (0.53-1.59 g·kg^-1) concentrations of alpine meadow, mountain meadow, and temperate meadow steppe were higher than the average concentrations of Chinese soil. However, the soil C:N (5.03-9.97) and C:P (7.50-52.38) ratios, as well as the soil N:P (1.53-3.72) ratios of temperate steppe, temperate desert steppe, and temperate desert, of the six grassland types were lower than the average ratios of Chinese soil (2) The concentrations of soil carbon, nitrogen, and phosphorus, as well as the C:N and C:P ratios, increased significantly with increasing altitude (328-2655 m) and precipitation and decreasing temperature. These parameters also exhibited significant correlations with soil physicochemical properties and vegetation characteristics. With increasing altitude and precipitation and decreasing temperature, the differences in soil carbon and nitrogen concentrations and soil C:P ratios gradually increased among soil layers. (3) The structural equation model revealed that altitude and climate exerted the highest impact on soil carbon, nitrogen, and phosphorus concentrations, as well as on their ecological stoichiometry. Altitude affected soil carbon, nitrogen, and phosphorus concentrations by changing the temperature, precipitation, vegetation characteristics, and soil physicochemical properties, ultimately affecting ecological stoichiometry. Future research should further explore the impact of climate change on soil carbon, nitrogen, and phosphorus concentrations, as well as on their ecological stoichiometry, at a regional scale. This study provides basic data and a theoretical basis for estimating soil nutrient storage, as well as for protecting and utilizing grassland ecosystems in the Irtysh River Basin.

Key words: grassland type, altitude, temperature, soil nutrient, soil ecological stoichiometry, Irtysh River Basin

LIANG Yuanye, FAN Lianlian, MA Xuexi, MAO Jiefei, HUI Tingting, LI Yaoming. Ecological stoichiometry of soil carbon, nitrogen, and phosphorus in six grassland types in northern Xinjiang[J].Arid Zone Research, 2024, 41(10): 1708-1718.

Figures/Tables 7

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References 40

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	高寒草甸	山地草甸	温性草甸草原	温性草原	温性荒漠草原	温性荒漠
土壤pH	5.05±0.14d	6.12±0.18c	7.05±0.08b	7.18±0.10b	8.47±0.45a	8.64±0.19a
土壤容重/(g·cm^-3)	1.05±0.04d	1.08±0.03d	1.26±0.06c	1.45±0.04b	1.62±0.04a	1.56±0.04a
土壤体积含水量/%	14.70±2.92a	8.77±0.98b	4.89±0.47c	3.90±0.45c	2.28±0.63c	2.51±0.41c
砂粒含量/%	30.75±6.58d	37.97±3.89d	44.26±4.02c	55.22±6.40b	75.54±6.99a	78.80±4.32a
粉粒含量/%	58.69±2.88a	54.03±3.31ab	48.21±3.42b	37.71±5.36c	20.45±5.87d	16.85±3.60d
黏粒含量/%	10.56±0.87a	8.00±0.69b	7.53±0.64b	7.07±1.09b	4.01±1.16c	4.03±0.74c
地上生物量/(g·m^-2)	50.79±4.07b	153.24±30.52a	46.27±12.82b	36.24±7.66bc	27.91±9.36c	27.51±6.52c
植被盖度/%	83.91±4.19a	84.58±4.00a	58.71±8.80b	46.53±3.28c	26.30±8.76d	27.51±5.17d
土壤质地	粉质壤土	粉质壤土	壤土	砂质壤土	砂土	砂土
土壤类型	黑钙土	黑钙土	栗钙土	栗钙土	栗钙土	栗钙土

	土壤有机碳/(g·kg^-1)	土壤总氮/(g·kg^-1)	土壤总磷/(g·kg^-1)	土壤碳氮比	土壤碳磷比	土壤氮磷比
土壤pH	-0.765^***	-0.788^***	-0.768^***	-0.190	-0.571^***	-0.495^***
土壤容重/(g·cm^-3)	-0.878^***	-0.861^***	-0.657^***	-0.403^***	-0.764^***	-0.625^***
土壤体积含水量/%	0.686^***	0.684^***	0.606^***	0.231	0.478^***	0.397^**
砂粒含量/%	-0.789^***	-0.797^***	-0.606^***	-0.226	-0.721^***	-0.645^***
粉粒含量/%	0.805^***	0.813^***	0.619^***	0.228	0.737^***	0.661^***
黏粒含量/%	0.632^***	0.633^***	0.478^***	0.193	0.568^***	0.502^***
地上生物量/(g·m^-2)	0.527^***	0.555^***	0.385^**	0.111	0.460^***	0.450^***
植被盖度/%	0.832^***	0.846^***	0.665^***	0.277^*	0.704^***	0.615^***

Ecological stoichiometry of soil carbon, nitrogen, and phosphorus in six grassland types in northern Xinjiang

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