文献类型：期刊文献

英文题名：Changes in plant-soil-microbe C-N-P contents and stoichiometry during poplar shelterbelt degradation

作者：Wang, Guan[1] Xiao, Huijie[1] Xin, Zhiming[2,3] Luo, Fengmin[2,3] Jin, Yuxi[1] Liu, Mingming[1] Li, Junran[4]

第一作者：Wang, Guan

通信作者：Wang, G[1];Xiao, HJ[1]

机构：[1]Beijing Forestry Univ, Sch Soil & Water Conservat, Beijing 100083, Peoples R China;[2]Chinese Acad Forestry, Expt Ctr Desert Forestry, Dengkou 015200, Peoples R China;[3]Natl Forestry & Grassland Adm, Inner Mongolia Dengkou Desert Ecosyst Natl Observa, Dengkou 015200, Peoples R China;[4]Univ Hong Kong, Dept Geog, Hong Kong 999077, Peoples R China

年份：2024

卷号：243

外文期刊名：CATENA

收录：;Scopus(收录号：2-s2.0-85197074227);WOS:【SCI-EXPANDED(收录号:WOS:001262807400001)】；

基金：This research was supported by the Intergovernmental International Cooperation Project in Science and Technology Innovation between China and United States (2023YFE0121800, 2019YFE0116500) , the Provincial Scientific Research Projects of Inner Mongolia (2022YFHH0065) , and National Natural Science Foundation of China (32371961) . We sincerely thank the staff of Dengkou Desert Ecosystem National Observation Research Station for their assistance.r China and United States (2023YFE0121800, 2019YFE0116500) , the Provincial Scientific Research Projects of Inner Mongolia (2022YFHH0065) , and National Natural Science Foundation of China (32371961) . We sincerely thank the staff of Dengkou Desert Ecosystem National Observation Research Station for their assistance.

语种：英文

外文关键词：Ecological stoichiometry; Poplar shelterbelts; Degradation stages; N limitations; Nutrient balance

摘要：Extensive poplar shelterbelts are experiencing degradation, yet the consequences of this deterioration on plantsoil-microbe stoichiometry remain poorly understood. In this study, we selected three distinct types of pure poplar shelterbelts and examined the dynamics of tree leaf, soil, and microbial biomass carbon (C), nitrogen (N), and phosphorus (P) contents, as well as their stoichiometric relationships, at different stages of shelterbelt degradation, in order to explore the balance and limitation of nutrients in these rapidly degrading ecosystems. Our results show a consistent reduction in foliar N:P ratio throughout the degradation process for all shelterbelts, indicating an amplified N limitation on tree growth as degradation ensued. However, the underlying mechanisms varied among tree species. For Populus alba shelterbelts, the diminished soil organic carbon and total nitrogen (TN) contents during degradation suggest a reduction in the availability of substrates and energy sources for N mineralization, which combines with higher microbial N assimilation reflected by elevated soil microbial biomass carbon (SMBC) content, contributing to lower N absorption by trees. In Lombardy poplar shelterbelts, the inconsistent trends among reduced foliar N, stable soil TN, and unaltered SMBC and SMBC: SMBN ratio suggest either a decrease in microbial activity as degradation advanced or a reallocation of N by trees into tissues like roots, leaving the leaves N-deficient. Within Populus popular's shelterbelts, the diminished foliar N content, accompanied by an augmented foliar C:N ratio and reduced soil N:P ratio, indicates potentially deteriorated litter quality. This deterioration contributes to knock-on effects involving N-deficit soil organic matter, limited soil N availability, decreased N absorption by trees, and subsequently reduced foliar N content. Our study highlights the distinctive responses of plant-soil-microbe C-N-P stoichiometry to shelterbelt degradation, contingent on tree species, underscoring the diverse strategies that poplar shelterbelts employ when confronted with harsh internal and external conditions.