Stoichiometric features of C, N, and P in soil and litter of Tamarix cones and their relationship with environmental factors in the Taklimakan Desert, China
Stoichiometric features of C, N, and P in soil and litter of Tamarix cones and their relationship with environmental factors in the Taklimakan Desert, China
复制标题
塔克拉玛干沙漠土壤和柽柳凋落物中C、N、P化学计量特征及其与环境因子的关系
DOI：
10.1007/s11368-019-02481-6
复制
发表时间：
2019-11-13
影响因子：
3.6
通讯作者：
Umut, Halik
中科院分区：
文献类型：
--
作者：
Dong, Zhengwu;Li, Congjuan;Umut, Halik
目的研究塔克拉玛干沙漠柽柳球果土壤和凋落物碳、氮、磷的化学计量特征，探讨土壤碳、氮、磷化学计量特征与环境因子的关系，探讨荒漠土壤碳、氮、磷化学计量特征的驱动因子。材料与方法在塔克拉玛干沙漠沿着边缘和腹地的且末、策勒、阿拉尔、塔中4个典型的柽柳林生境中，从地表至500 cm深度采集土壤样品。采用方差分析（ANOVA）和基于距离的冗余分析（db-RDA）方法分析了土壤C、N和P化学计量的垂直分布格局，并确定了影响土壤化学计量的关键环境因子。结果与讨论整个剖面土壤和枯枝落叶层C和N浓度随着土壤深度的增加而降低，而P浓度随深度的增加没有显着差异。土壤C、N浓度、C/P比和N/P比在盐土荒漠样地（且末）显著高于其他样地。0 - 500 cm土层内土壤C、N与凋落物C、N、P均呈显著负相关。与此相反，土壤P没有显着影响凋落物组成，因为它主要来自土壤底部的母质。此外，环境因子对土壤和凋落物化学计量学总方差的解释率分别大于98%和68.6%。结果还表明，在所有样地，环境因子对土壤化学计量的影响主要是由土壤凋落物含量、粉粒、砂粒和土壤含水量引起的。然而，在且末，土壤化学计量也受到粘粒含量的影响，在阿拉尔和塔中，pH值，电导率，和年均温度也产生了强烈的影响，土壤化学计量。结论土壤性质（粘粒、粉粒、砂粒含量）和凋落物含量对塔克拉玛干沙漠红柳球果土壤C、N、P的化学计量有很大影响。在盐碱地区，土壤的盐度（电导率）和碱度（pH值）也可能影响土壤的化学计量。此外，柽柳球果的形成过程也影响土壤化学计量。考虑到塔克拉玛干沙漠极端干旱区降水量少、蒸发量大的特点，本研究对极端干旱区荒漠生态系统土壤化学计量学模式进行了深入研究。
Purpose The main objectives of this study were to explore the soil and litter carbon (C), nitrogen (N), and phosphorus (P) stoichiometric features in the Tamarix cones across the Taklimakan Desert, China, and also to verify the relationships between soil C, N, and P stoichiometry and environmental factors, with the ultimate aim of finding out the driving factors for the stoichiometric characteristics of desert soils. Materials and methods The soils under Tamarix cones, from the surface to a depth of 500 cm, were sampled in four typical Tamarix habitats (at Qiemo, Qira, Aral, Tazhong) of the Tamarix cones along the periphery and in the hinterland of the Taklimakan Desert. Soil samples were collected to measure soil properties and the concentrations of soil and litter C, N, and P. Analysis of variance (ANOVA) and distance-based redundancy analysis (db-RDA) were used to analyze the vertical patterns of soil C, N, and P stoichiometry and to identify the critical environmental factors influencing soil stoichiometry. Results and discussion Soil and litter C and N concentrations decreased with increasing soil depth throughout the profiles, while P concentrations showed no significant differences with depth. Soil C and N concentration, C/P ratios, and N/P ratios were significantly higher at the saline desert site (Qiemo) than at the other sites. Soil C and N were negatively correlated with litter C, N, and P within the 0-500-cm layer. In contrast, soil P was not significantly influenced by litter composition as it is primarily derived from the parent material at the soil bottom. In addition, environmental factors explained > 98% and 68.6% of the total variance of soil and litter stoichiometry, respectively. The results also indicated that, at all sites, the impacts of environmental factors on soil stoichiometry were mainly caused by the soil litter content, silt, sand, and soil water contents. However, at Qiemo, soil stoichiometry was also affected by the clay content, and at Aral and Tazhong, the pH, electrical conductivity, and mean annual temperature also exerted a strong influence on soil stoichiometry. Conclusions It could be concluded that the soil properties (such as, soil clay, silt, and sand content) and litter content exert a great influence on the stoichiometry of soil C, N, and P in the Tamarix cones of the Taklimakan Desert. In saline areas, soil salinity (electrical conductivity) and alkalinity (pH) may also influence the soil stoichiometry. In addition, the formation process of Tamarix cones also affects soil stoichiometry. Considering the extremely low precipitation and intensive evaporation in the Taklimakan Desert, this study provides a deep insight into the patterns of soil stoichiometry within extreme arid desert ecosystems.