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

干旱区研究 ›› 2024, Vol. 41 ›› Issue (10): 1708-1718.doi: 10.13866/j.azr.2024.10.09 cstr: 32277.14.j.azr.2024.10.09

新疆北部六种草地类型土壤碳氮磷生态化学计量特征

梁元也¹^,²^,³(), 范连连¹^,²^,³, 马学喜¹^,²^,³, 毛洁菲¹^,²^,³, 惠婷婷¹^,²^,³, 李耀明¹^,²^,³()

1.中国科学院新疆生态与地理研究所，新疆乌鲁木齐 830011
2.中国科学院中亚生态与环境研究中心，新疆乌鲁木齐 830011
3.中国科学院大学，北京 100049

收稿日期:2024-03-06 修回日期:2024-05-14 出版日期:2024-10-15 发布日期:2024-10-14
通讯作者: 李耀明. E-mail: lym@ms.xjb.ac.cn
作者简介:梁元也（1997-），女，硕士研究生，主要从事草地土壤研究. E-mail: liangyuanye20@mails.ucas.ac.cn
基金资助:
第三次新疆综合科学考察项目(2021xjkk0603);国家自然科学基金面上项目(42077327)

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

LIANG Yuanye¹^,²^,³(), FAN Lianlian¹^,²^,³, MA Xuexi¹^,²^,³, MAO Jiefei¹^,²^,³, HUI Tingting¹^,²^,³, LI Yaoming¹^,²^,³()

1. Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, Xinjiang, China
2. Research Center for Ecology and Environment of Central Asia, Chinese Academy of Sciences, Urumqi 830011, Xinjiang, China
3. University of Chinese Academy of Sciences, Beijing 100049, China

Received:2024-03-06 Revised:2024-05-14 Published:2024-10-15 Online:2024-10-14

摘要/Abstract

摘要：

草地土壤碳氮磷含量及其生态化学计量的空间变异关系到草地生态系统的功能与稳定性。海拔、气候、土壤性质和植被如何影响新疆北部典型牧区额尔齐斯河（简称额河）流域土壤碳氮磷化学计量的空间格局尚不清楚。本文选取了额河流域六种主要草地类型的65个样点（0~10 cm、10~20 cm土层）进行研究。结果表明：（1）高寒草甸、山地草甸、温性草甸草原有机碳（39.06~62.59 g·kg^-1）、总氮含量（3.87~6.95 g·kg^-1）以及六种草地类型的土壤总磷含量（0.53~1.59 g·kg^-1）总体上高于中国土壤平均值（24.56 g·kg^-1、1.88 g·kg^-1、0.56 g·kg^-1），而六种草地类型的土壤碳氮比（5.03~9.97）、碳磷比（7.50~52.38）以及温性草原、温性荒漠草原和温性荒漠土壤氮磷比（1.53~3.72）低于中国或全球土壤平均值（11.40、64.30、3.90）。（2）土壤碳氮磷含量以及碳磷比、氮磷比随着海拔升高（328~2655 m）、降水量增加以及温度降低而显著增加，并且与植被特征、土壤理化性质有显著的相关性。随着海拔的升高，土壤有机碳、总氮含量与土壤碳磷比在土层间的差异逐渐增加。（3）结构方程模型结果表明，海拔与气候因子对土壤碳氮磷含量及其生态化学计量的影响效应最高，海拔通过改变温度、降水、植被特征、土壤理化性质影响土壤碳氮磷含量，最终影响生态化学计量。未来应进一步开展气候变化对土壤碳氮磷及其生态化学计量影响的跨区域尺度研究。

关键词: 草地类型, 海拔, 温度, 土壤养分, 生态化学计量, 额尔齐斯河流域

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

梁元也, 范连连, 马学喜, 毛洁菲, 惠婷婷, 李耀明. 新疆北部六种草地类型土壤碳氮磷生态化学计量特征[J]. 干旱区研究, 2024, 41(10): 1708-1718.

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.

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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^***

新疆北部六种草地类型土壤碳氮磷生态化学计量特征

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

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