Response of C:N:P in the plant-soil system and stoichiometric homeostasis of Nitraria tangutorum leaves in the oasis-desert ecotone, Northwest China

• Published in: Journal of arid land Vol. 13; no. 9; pp. 934 - 946
• Main Authors: Wei, Yajuan, Dang, Xiaohong, Wang, Ji, Gao, Junliang, Gao, Yan
• Format: Journal Article
• Language: English
• Published: Heidelberg Science Press 01.09.2021; Springer Nature B.V; Inner Mongolia Hangjin Desert Ecological Research Station,Erdos 017400,China%Experimental Center of Desert Forestry,Chinese Academy of Forestry,Dengkou 015200,China; Key Laboratory of State Forest Administration for Desert Ecosystem Protection and Restoration,Hohhot 010018,China%Institute of Desert Control Science and Engineering,Inner Mongolia Agricultural University,Hohhot 010018,China; Institute of Desert Control Science and Engineering,Inner Mongolia Agricultural University,Hohhot 010018,China; Key Laboratory of State Forest Administration for Desert Ecosystem Protection and Restoration,Hohhot 010018,China
• Subjects: Acidic soils; Acidity; Adaptability; Arid regions; Carbon; Community structure; Degradation; Desert environments; Deserts; Earth and Environmental Science; Ecosystem stability; Geography; Habitat selection; Homeostasis; Leaves; Nitraria; Nitrogen; Nutrients; Oases; Organic carbon; Organic phosphorus; Organic soils; Phosphorus; Physical Geography; Plant Ecology; Redundancy; Research Article; Semiarid environments; Shrubs; Soil; Soil depth; Soil nutrients; Soil stability; Soils; Stabilizing; Stoichiometry; Storage capacity; Storage conditions; Sustainable Development; China; successional stages; ecological adaptability; nebkhas; arid area; ecological stoichiometry
• ISSN: 1674-6767; 2194-7783
• DOI: 10.1007/s40333-021-0019-z

Nitraria tangutorum nebkhas are widely distributed in the arid and semi-arid desert areas of China. The formation and development of N. tangutorum nebkhas are the result of the interaction between vegetation and the surrounding environment in the process of community succession. Different successional stages of N. tangutorum nebkhas result in differences in the community structure and composition, thereby strongly affecting the distribution of soil nutrients and ecosystem stability. However, the ecological stoichiometry of N. tangutorum nebkhas in different successional stages remains poorly understood. Understanding the stoichiometric homeostasis of N. tangutorum could provide insights into its adaptability to the arid and semi-arid desert environments. Therefore, we analyzed the stoichiometric characteristics of N. tangutorum in four successional stages, i.e., rudimental, developing, stabilizing, and degrading stages using a homeostasis model in an oasis-desert ecotone of Northwest China. The results showed that soil organic carbon (SOC), total nitrogen (TN), and total phosphorus (TP) contents and their ratios in the 0–100 cm soil depth were significantly lower than the averages at regional and global scales and were weakly influenced by successional stages in the oasis-desert ecotone. TN and TP contents and C:N:P in the soil showed similar trends. Total carbon (TC) and TN contents in leaves were 450.69–481.07 and 19.72–29.35 g/kg, respectively, indicating that leaves of N. tangutorum shrubs had a high storage capacity for C and N. Leaf TC and TN contents and N:P ratio increased from the rudimental stage to the stabilizing stage and then decreased in the degrading stage, while the reverse trend was found for leaf C:N. Leaf TP content decreased from the rudimental stage to the degrading stage and changed significantly in late successional stages. N:P ratio was above the theoretical limit of 14, indicating that the growth of N. tangutorum shrubs was limited by P during successional stages. Leaf N, P, and N:P homeostasis in four successional stages was identified as “strictly homeostasis”. Redundancy analysis (RDA) revealed that soil acidity (pH) and the maximum water holding capacity were the main factors affecting C:N:P stoichiometric characteristics in N. tangutorum leaves. Our study demonstrated that N. tangutorum with a high degree of stoichiometric homeostasis could better cope with the arid desert environment.