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

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Journal of Arid Land 2021年第9期13卷 934-946页

作者： WEI Yajuan DANG Xiaohong WANG Ji GAO Junliang GAO Yan Institute of Desert Control Science and Engineering Inner Mongolia Agricultural UniversityHohhot 010018China Key Laboratory of State Forest Administration for Desert Ecosystem Protection and Restoration Hohhot 010018China Inner Mongolia Hangjin Desert Ecological Research Station Erdos 017400China Experimental Center of Desert Forestry Chinese Academy of ForestryDengkou 015200China

Nitraria tangutorum nebkhas are widely distributed in the arid and semi-arid desert areas of *** formation and development of *** nebkhas are the result of the interaction between vegetation and the surrounding environment in the process of community *** successional stages of *** nebkhas result in differences in the community structure and composition,thereby strongly affecting the distribution of soil nutrients and ecosystem ***,the ecological stoichiometry of *** nebkhas in different successional stages remains poorly *** the stoichiometric homeostasis of *** could provide insights into its adaptability to the arid and semi-arid desert ***,we analyzed the stoichiometric characteristics of *** in four successional stages,i.e.,rudimental,developing,stabilizing,and degrading stages using a homeostasis model in an oasis-desert ecotone of Northwest *** 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 *** and TP contents and C:N:P in the soil showed similar *** carbon(TC)and TN contents in leaves were 450.69-481.07 and 19.72-29.35 g/kg,respectively,indicating that leaves of *** shrubs had a high storage capacity for C and *** 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:*** 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 *** shrubs was limited by P during successional *** N,P,and N

关键词： nebkhas ecological stoichiometry ecological adaptability successional stages arid area

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