青藏高原土壤全氮和氮组分沿海拔梯度的分布及其控制因素

IF 2.8 3区 农林科学 Q3 ENVIRONMENTAL SCIENCES Journal of Soils and Sediments Pub Date : 2024-08-06 DOI:10.1007/s11368-024-03882-y
Da Meng, Xinyu Wang, Jiayi Tang, Ning Zong, Jinjing Zhang, Nianpeng He
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引用次数: 0

摘要

目的 了解土壤养分的空间变化及其驱动因素对于陆地生态系统的可持续养分管理和相关环境评估至关重要。材料与方法 2005 年以来,我们在念青唐古拉山南坡建立了海拔 4400 米、4500 米、4650 米、4800 米、4950 米和 5200 米的六个实验点。结果与讨论随着海拔的升高,总氮、碱解氮、无机氮组分(铵氮和硝酸氮)和有机氮组分(酸解有机氮和酸不溶有机氮)的含量逐渐增加,在海拔 4800 或 4950 米处达到最大值,然后逐渐减少。土壤有机碳解释了 TN 和 N 分量变化的 90.5%,土壤水分、pH 值、矿物学、质地和氮水解酶活性解释了 TN 和 N 分量变化的 8.80%。年平均气温和降水量对土壤有机碳有直接的正向影响,而土壤有机碳对无机氮组分和植物地上生物量依次有正向影响。气候变化可通过调节土壤无机氮的分布影响高寒草地的生产力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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Distributions and controlling factors of soil total nitrogen and nitrogen fractions along an altitude gradient in Qinghai-Tibet Plateau

Purpose

Understanding spatial variations in soil nutrients and its drivers is essential for sustainable nutrient management and related environmental assessment in terrestrial ecosystems. Here, we investigated the distribution characteristics and controlling factors of soil total nitrogen (N) and N fractions along an altitude gradient in an alpine meadow of the Qinghai-Tibet Plateau.

Materials and methods

Six experimental sites at altitudes 4400, 4500, 4650, 4800, 4950, and 5200 m were established on southern slope of Nyainqentanglha Mountain since 2005. Total N and N fractions were quantified and their relationships with climate, vegetation, and edaphic factors were analyzed by Pearson correlation, redundancy analysis, and structural equation modeling.

Results and discussion

With increasing altitude, the contents of total N, alkali-hydrolyzable N, inorganic N fractions (ammonium N and nitrate N), and organic N fractions (acid-hydrolyzable and acid-insoluble organic N) gradually increased, reached their maximums at altitude 4800 or 4950 m, and then decreased. Soil organic carbon explained 90.5% of the variations in TN and N fractions, and soil moisture, pH, mineralogy, texture, and N hydrolyzing enzyme activity explained 8.80% of the variations in TN and N fractions. Mean annual temperature and precipitation exhibited direct and positive impact on soil organic carbon, which had positive effect on inorganic N fractions and plant aboveground biomass in sequence.

Conclusions

Soil organic carbon is the most dominant factors driving the variations in TN and N fractions along the altitude gradient. Climate change can impact alpine grassland productivity by regulating soil inorganic N distribution.

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来源期刊
Journal of Soils and Sediments
Journal of Soils and Sediments 环境科学-土壤科学
CiteScore
7.00
自引率
5.60%
发文量
256
审稿时长
3.5 months
期刊介绍: The Journal of Soils and Sediments (JSS) is devoted to soils and sediments; it deals with contaminated, intact and disturbed soils and sediments. JSS explores both the common aspects and the differences between these two environmental compartments. Inter-linkages at the catchment scale and with the Earth’s system (inter-compartment) are an important topic in JSS. The range of research coverage includes the effects of disturbances and contamination; research, strategies and technologies for prediction, prevention, and protection; identification and characterization; treatment, remediation and reuse; risk assessment and management; creation and implementation of quality standards; international regulation and legislation.
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