贺兰山不同海拔土壤团聚体碳氮磷含量及其化学计量特征变化

doi:10.13287/j.1001-9332.202104.029

应用生态学报 ›› 2021, Vol. 32 ›› Issue (4): 1241-1249.doi: 10.13287/j.1001-9332.202104.029

贺兰山不同海拔土壤团聚体碳氮磷含量及其化学计量特征变化

吴梦瑶^1,2, 陈林^1,2, 庞丹波^1,2, 刘波^1,2, 刘丽贞^1,2, 邱开阳^1,2, 李学斌^1,2*

¹宁夏大学西北退化生态系统恢复与重建教育部重点实验室, 银川 750021;
²宁夏大学西北土地退化与生态恢复国家重点实验室培育基地, 银川 750021

收稿日期:2020-09-24 接受日期:2021-01-25 发布日期:2021-10-25
通讯作者: *E-mail: lixuebin@nxu.edu.cn
作者简介:吴梦瑶, 女, 1994年生, 硕士研究生。主要从事土壤有机碳循环研究。E-mail: wmy201809@163.com
基金资助:
宁夏重点研发项目(2018BFG02015)、国家自然科学基金项目(31960359,42001095)、宁夏自然科学基金项目(2020AAC03102)和第三批宁夏青年科技人才托举工程项目(TJGC2018068)资助

Changes of the concentrations and stoichiometry of carbon, nitrogen and phosphorus in soil aggregates along different altitudes of Helan Mountains, Northwest China.

WU Meng-yao^1,2, CHEN Lin^1,2, PANG Dan-bo^1,2, LIU Bo^1,2, LIU Li-zhen^1,2, QIU Kai-yang^1,2, LI Xue-bin^1,2*

¹Ministry of Education Key Laboratory for Restoration and Reconstruction of Degraded Ecosystem in Northwest China, Ningxia University, Yinchuan 750021, China;
²Breeding Base for State Key Laboratory of Land Degradation and Ecological Restoration in Northwest China, Ningxia University, Yinchuan 750021, China

Received:2020-09-24 Accepted:2021-01-25 Published:2021-10-25
Contact: *E-mail: lixuebin@nxu.edu.cn
Supported by:
Ningxia Hui Autonomous Region Key Research and Development Project (2018BFG02015), the National Natural Science Foundation of China (31960359, 42001095), the Ningxia Natural Science Foundation (2020AAC03102) and the Third Batch of Ningxia Young Scientific and Technological Talent Support Project (TJGC2018068).

摘要/Abstract

摘要： 探究干旱半干旱区山地森林生态系统不同海拔土壤养分在团聚体中的分布规律,可为理解脆弱山地生态系统养分循环提供理论依据。本研究以贺兰山不同海拔(1380～2438 m)土壤为对象,分析0～20 cm土层团聚体分布及其稳定性、不同粒级团聚体有机碳、全氮、全磷储量及其化学计量特征。结果表明: 随海拔升高贺兰山主要土壤团聚体由微团聚体(0.25～0.053 mm)转变为大团聚体(>0.25 mm),平均重量直径(MWD)和几何平均直径(GMD)在高海拔样地(2139～2248 m)显著高于低海拔样地(1380～1650 m)。各粒级团聚体有机碳、全氮含量和储量随海拔升高呈增大趋势;全磷含量随海拔升高呈波动趋势,且在各粒级团聚体分布均匀。大团聚体和微团聚体对土壤养分具有更高的贡献率,各粒级团聚体比例是影响土壤养分的关键因素,大团聚体和微团聚体是土壤养分的主要载体。各粒级团聚体C∶N在不同海拔变化不显著,C∶P和N∶P在中高海拔显著高于低海拔。贺兰山中高海拔的表层土壤具有更高的养分储量,较高含量的大团聚体和微团聚体有助于有机碳和养分的固持,低海拔土壤氮素限制高,在森林培育过程中可通过适当添加氮肥以改善低海拔土壤全氮状况。

关键词: 团聚体, 有机碳, 全氮, 全磷, 化学计量, 海拔

Abstract: Exploring the distribution patterns of soil nutrients in aggregates of forests along different altitudes in arid and semi-arid areas can provide a theoretical basis for understanding nutrient cycling in vulnerable mountain ecosystems. In this study, we analyzed the distribution and stability of aggregates in the 0-20 cm soil layer along different altitudes (1380-2438 m) of Helan Mountains and measured the storage and stoichiometric characteristics of organic carbon, total nitrogen, and total phosphorus in soil aggregates. Results showed that the main soil aggregates of Helan Mountains changed from micro-aggregates (0.25-0.053 mm) to macro-aggregates (>0.25 mm) with increa-sing elevation. The mean weight diameter (MWD) and geometric mean diameter (GMD) of soil aggregates in high altitude (2139-2248 m) were significantly higher than those in low altitude (1380-1650 m). The content and storage of organic carbon and total nitrogen in soil aggregates of different size fractions were positively correlated with altitude, while the content of total phosphorus fluctuated with the increase in elevation and distributed uniformly in aggregates. Macro-aggregates and micro-aggregates had more contribution to soil nutrient storage than the silt and clay fractions, indicating that the proportion of aggregates with different size fractions was the key factor affecting soil nutrient storage and that macro-aggregates and micro-aggregates were the main carriers of soil nutrients. Moreover, the C:N ratio in aggregates of different size fractions did not change across different altitudes, whereas the C:P and N:P ratio were higher at mid and high elevations than those at low elevations. Our results indicated that the mid and high elevations of Helan Mountains had higher nutrient storage in the surface soil layer, and that higher content of macro-aggregates and micro-aggregates would help to retain organic carbon and nutrients in the soil. Soil nitrogen limitation was strong at low altitude in our study, suggesting that the appropriate amount of nitrogen addition in low altitudes could improve total nitrogen status during forest cultivation.

Key words: aggregates, organic carbon, total nitrogen, total phosphorus, stoichiometry, elevation

吴梦瑶, 陈林, 庞丹波, 刘波, 刘丽贞, 邱开阳, 李学斌. 贺兰山不同海拔土壤团聚体碳氮磷含量及其化学计量特征变化[J]. 应用生态学报, 2021, 32(4): 1241-1249.

WU Meng-yao, CHEN Lin, PANG Dan-bo, LIU Bo, LIU Li-zhen, QIU Kai-yang, LI Xue-bin. Changes of the concentrations and stoichiometry of carbon, nitrogen and phosphorus in soil aggregates along different altitudes of Helan Mountains, Northwest China.[J]. Chinese Journal of Applied Ecology, 2021, 32(4): 1241-1249.

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贺兰山不同海拔土壤团聚体碳氮磷含量及其化学计量特征变化

Changes of the concentrations and stoichiometry of carbon, nitrogen and phosphorus in soil aggregates along different altitudes of Helan Mountains, Northwest China.

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