文献类型：期刊文献

英文题名：Limited plant community responses to long-term phosphorus addition in a nitrogen-enriched alkaline desert steppe

作者：Han, Cui[1,2,3] Yu, Hailong[4] Fang, Zhao[5] Wang, Bin[6] Huang, Juying[1,2,3]

第一作者：Han, Cui

通信作者：Huang, JY[1];Huang, JY[2];Huang, JY[3]

机构：[1]Ningxia Univ, Sch Ecol & Environm, Yinchuan 750021, Peoples R China;[2]Breeding Base State Key Lab Land Degradat & Ecol R, Yinchuan 750021, Peoples R China;[3]Minist Educ, Key Lab Restorat & Reconstruct Degraded Ecosyst No, Yinchuan 750021, Peoples R China;[4]Ningxia Univ, Sch Geog & Planning, Yinchuan 750021, Peoples R China;[5]Northwest A&F Univ, Inst Soil & Water Conservat, Yangling 712100, Peoples R China;[6]Chinese Acad Forestry, Res Inst Subtrop Forestry, Fuyang 311400, Peoples R China

年份：2024

外文期刊名：PLANT AND SOIL

收录：;Scopus(收录号：2-s2.0-105001091959);WOS:【SCI-EXPANDED(收录号:WOS:001234181100003)】；

基金：This work was supported by the Natural Science Foundation of Ningxia (2022AAC02012) and Natural Science Foundation of China (32160277&32371632). We greatly thank the constructive comments and suggestions from two anonymous reviewers help improve the quality of this manuscript.

语种：英文

外文关键词：Alkaline soil; C:N:P stoichiometry; Nutrient addition; Nutrient limitation; Plant community composition

摘要：Aims Dryland ecosystems are highly susceptible to variations in nutrient availability. The effects of nitrogen (N) availability on plant communities have been widely studied. However, to date, relatively few studies have focused on the effects of phosphorus (P) input on plant biomass and diversity, particularly in alkaline drylands with elevated N deposition. MethodsA long-term field experiment with a multi-level P addition rate (0-16 g P m-2 yr-1) plus 5 g N m-2 yr-1 in an alkaline desert steppe was conducted in northwestern China from 2015 to 2021. The effects of nutrient addition on plant community variation were investigated. Their relationships with soil properties, plant-microbe-soil C: N:P stoichiometry, and climatic factors were also analyzed. Results Under N addition, plant community biomass and diversity were slightly affected by P addition (P > 0.05). Although there was significant interannual variability in the plant community (P < 0.01), the interaction between P addition and year was not significant (P > 0.05). Variance partitioning and structural equation modelling showed that plant community variation under N addition was highly resistant to P addition and that soil properties (electric conductivity, available nutrients, and phosphatase activity), plant-microbe-soil C: N:P stoichiometry (plant total N, soil total N, and microbial biomass P), and climatic factors (average monthly temperature and precipitation) combined to regulate their stability. Conclusions Our findings indicate that the effects of long-term P addition on the plant communities of desert steppes with N addition are limited. Future P enrichment may not pose substantial risks of plant community alteration in dryland ecosystems under N deposition.