半灌木扩张草原生长季内土壤氮矿化特征及其影响因素

doi:10.11733/j.issn.1007-0435.2023.09.017

草地学报 ›› 2023, Vol. 31 ›› Issue (9): 2730-2739.DOI: 10.11733/j.issn.1007-0435.2023.09.017

半灌木扩张草原生长季内土壤氮矿化特征及其影响因素

拓行行¹, 黄建弟², 白玥³, 田慧慧¹, 李美慧¹, 王子临¹, 杨梦茹¹, 王亦波¹, 叶发明^4,5, 李伟⁶

1. 西北农林科技大学草业与草原学院, 陕西杨凌 712100;
2. 宁夏师范学院化学化工学院, 宁夏固原 756000;
3. 西部机场集团榆林机场有限公司, 陕西榆林 719000;
4. 中国科学院水利部水土保持研究所, 陕西杨凌 712100;
5. 中国科学院大学, 北京 100049;
6. 西北农林科技大学水土保持研究所, 陕西杨凌 712100

收稿日期:2023-05-03 修回日期:2023-07-16 出版日期:2023-09-15 发布日期:2023-10-07
通讯作者: 李伟,E-mail:liwei2013@nwsuaf.edu.cn
作者简介:拓行行(1996-),男,汉族,陕西榆林人,硕士研究生,主要从事群落生态学研究,E-mail:tuohanghang@nwafu.edu.cn
基金资助:
国家重点研发计划项目课题(2022YFF1302805)；国家自然科学基金(42277464)；宁夏自然科学基金 (2023AAC03350)资助

Characteristics of Soil Nitrogen Mineralization and its Influencing Factors before and after Growing Season in Subshrub Expansion Grassland

TUO Hang-hang¹, HUANG Jian-di², BAI Yue³, TIAN Hui-hui¹, LI Mei-hui¹, WANG Zi-lin¹, YANG Meng-ru¹, WANG Yi-bo¹, YE Fa-ming^4,5, LI Wei⁶

1. College of Grassland Agriculture, Northwest Agriculture and Forestry University, Yangling, Shaanxi Province 712100, China;
2. College of Chemistry and Chemical Engineering, Ningxia Normal University, Guyuan, Ningxia Province 756000, China;
3. West Airport Group Yulin Airport Co., Ltd, Yulin, Shaanxi Province 719000, China;
4. Institute of Soil and Water Conservation. CAS & MWR, Yangling, Shaanxi Province 712100, China;
5. University of Chinese Academy of Science, Beijing 100049, China;
6. Institute of Soil and Water Conservation, Northwest Agriculture and Forestry University, Yangling, Shaanxi Province 712100, China

Received:2023-05-03 Revised:2023-07-16 Online:2023-09-15 Published:2023-10-07

摘要/Abstract

摘要： 半灌木扩张可影响生态系统的结构和功能。为探究半灌木扩张草原生长季内土壤氮矿化特征及其影响因素,本研究以宁夏云雾山不同半灌木(白莲蒿Artemisia sacrorum)扩张强度天然草原为研究对象,采用顶盖埋管法测定了生长季前、后的土壤氮硝化速率、铵化速率和净矿化速率,分析了其与物种多样性、地上生物量和土壤环境因子的关系。结果表明:半灌木扩张草原土壤氮矿化主要以硝化过程为主,且矿化和固持速率均随扩张强度的增大呈先增加后降低的趋势;半灌木扩张通过影响物种多样性和地上生物量间接影响土壤氮矿化速率;生长季内土壤水分和温度的增加对氮矿化速率有显著抑制作用。综上,宁夏云雾山典型草原半灌木扩张强度和生长季内土壤水分和温度的变化共同驱动土壤氮矿化过程。

关键词: 半灌木扩张, 土壤氮矿化, 土壤水分, 土壤温度, 物种多样性

Abstract: Subshrub expansion can significantly change the structure,function and process of the ecosystem. In order to explore the characteristics of soil nitrogen mineralization and its influencing factors before and after the growing season of subshrub expansion grassland,this study took the natural grassland with different subshrub(Artemisia sacrorum) expansion intensity in Yunwu Mountain in Ningxia as the research object,and used the in-situ buried pipe culture method to determine the soil nitrogen nitrification rate,ammonium rate and net mineralization rate before and after the growing season,and analyzed its relationship with species diversity and aboveground biomass and soil environment. The results showed that main soil nitrogen mineralization in subshrub expanded grassland was nitrification,and the mineralization and fixation rates increased at first and then decreased with the increase of expansion intensity. Subshrub expansion indirectly affected the rate of soil nitrogen mineralization by affecting species diversity and aboveground biomass. The increase of soil moisture and temperature had a significant inhibitory effect on the rate of nitrogen mineralization during the growing season. In summary,the expansion intensity of semi-shrubs and the changes of soil moisture and temperature during the growing season jointly drived the process of soil nitrogen mineralization in the typical steppe of the Loess Plateau.

Key words: Subshrub expansion, Soil nitrogen mineralization, Soil water content, Soil temperature, Species diversity

中图分类号:

S812.6

拓行行, 黄建弟, 白玥, 田慧慧, 李美慧, 王子临, 杨梦茹, 王亦波, 叶发明, 李伟. 半灌木扩张草原生长季内土壤氮矿化特征及其影响因素[J]. 草地学报, 2023, 31(9): 2730-2739.

TUO Hang-hang, HUANG Jian-di, BAI Yue, TIAN Hui-hui, LI Mei-hui, WANG Zi-lin, YANG Meng-ru, WANG Yi-bo, YE Fa-ming, LI Wei. Characteristics of Soil Nitrogen Mineralization and its Influencing Factors before and after Growing Season in Subshrub Expansion Grassland[J]. Acta Agrestia Sinica, 2023, 31(9): 2730-2739.

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半灌木扩张草原生长季内土壤氮矿化特征及其影响因素

Characteristics of Soil Nitrogen Mineralization and its Influencing Factors before and after Growing Season in Subshrub Expansion Grassland

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