降水变化与氮添加对晋北盐碱化草地土壤净氮矿化的影响

doi:10.13287/j.1001-9332.202107.009

应用生态学报 ›› 2021, Vol. 32 ›› Issue (7): 2389-2396.doi: 10.13287/j.1001-9332.202107.009

降水变化与氮添加对晋北盐碱化草地土壤净氮矿化的影响

王岩^1,2, 刁华杰^2,3,4, 董宽虎^3,4, 王常慧^2,3,4, 赵威^1*

¹河南科技大学农学院, 河南洛阳 471023;
²中国科学院植物研究所植被与环境变化国家重点实验室, 北京 100093;
³山西农业大学草业学院, 山西晋中 030801;
⁴山西右玉黄土高原草地生态系统定位观测研究站, 山西右玉 037200

收稿日期:2021-02-19 修回日期:2021-03-20 出版日期:2021-07-15 发布日期:2022-01-15
通讯作者: *zhaowei1@haust.edu.cn
作者简介:王岩,男,1996年生,硕士研究生.主要从事全球变化下草地土壤氮循环研究.E-mail:529552538@qq.com
基金资助:
国家自然科学基金项目(31770526)和国家重点研发计划项目(2017YFA0604802)

Effects of precipitation change and nitrogen addition on soil net N mineralization in a saline-alkaline grassland of Northern Shanxi Province, China

WANG Yan^1,2, DIAO Hua-jie^2,3,4, DONG Kuan-hu^3,4, WANG Chang-hui^2,3,4, ZHAO Wei^1*

¹College of Agriculture, Henan Univer-sity of Science and Technology, Luoyang 471023, Henan, China;
²State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China;
³College of Grassland Science, Shanxi Agricultural University, Jinzhong 030801, Shanxi, China;
⁴Youyu Loess Plateau Grassland Ecosystem Research Station, Youyu 037200, Shanxi,China

Received:2021-02-19 Revised:2021-03-20 Online:2021-07-15 Published:2022-01-15
Contact: *zhaowei1@haust.edu.cn
Supported by:
National Natural Science Foundation of China (31770526) and the National Key R&D Program of China (2017YFA0604802).

摘要/Abstract

摘要： 于2018年在晋北典型农牧交错带盐碱化草地设置增减降水和氮添加处理试验, 2019年生长季(5—9月)采用原位顶盖PVC埋管法测定不同水、氮处理下土壤净氮矿化速率,研究盐碱化草地土壤净氮矿化速率对降水格局变化和氮沉降的响应。结果表明: 土壤净氮矿化速率表现出明显的季节动态。单独增减降水(±50%)和氮添加(10 g·m^-2·a^-1)以及氮添加+增加50%降水处理对土壤净氮矿化速率影响不显著,氮添加+减少50%降水处理显著提高土壤净硝化速率和净氮矿化速率,分别提高10.8和8.6倍。土壤净氮矿化速率与土壤含水量呈显著正相关,与土壤pH值呈显著负相关。氮添加在不同降水条件下对晋北盐碱化草地土壤氮矿化速率的影响存在差异,土壤含水量与pH值是晋北盐碱化草地土壤净氮矿化速率的主要影响因素。因此,全面评估草地土壤氮矿化过程对全球变化的响应模式,需要考虑降水格局变化与氮沉降增加的交互作用,以及盐碱化草地土壤理化性质的特殊性。

关键词: 净氮矿化, 盐碱化草地, 降水变化, 氮添加

Abstract: To explore the responses of soil net nitrogen (N) mineralization rate to precipitation varia-tion and nitrogen deposition in salinized grassland, we set precipitation manipulation and nitrogen addition experiments in the typical agro-pastoral ecotone saline-alkaline grassland of Northern Shanxi Province, China. The in situ soil net N mineralization rate was determined by top-cover buried PVC cylinder from May to September in 2019. The results showed that there were seasonal dynamics in soil net N mineralization rate. Soil net N mineralization rate was not affected by increase/decrease precipitation (±50%), nitrogen addition (10 g·m^-2·a^-1) or the combination of nitrogen addition and increase 50% precipitation treatments. The combination of nitrogen addition and 50% reduction of precipitation significantly improved soil net nitrification rate and net N mine-ralization rate by 10.8 and 8.6 times, respectively. Soil net nitrogen mineralization rate was positively related to soil water content, and negatively related to soil pH. The effects of nitrogen addition on soil nitrogen mineralization rate were dependent on precipitation conditions. Soil water content and pH were important factors regulating soil net nitrogen mineralization rate in the saline-alkaline grassland of Northern Shanxi Province. Therefore, to roundly assess the response model of soil N mine-ralization process to global change, it is necessary to consider the interaction of precipitation changes and nitrogen addition, and the soil physical and chemical properties of salinized grassland.

Key words: net nitrogen mineralization, saline-alkaline grassland, precipitation change, nitrogen addition

王岩, 刁华杰, 董宽虎, 王常慧, 赵威. 降水变化与氮添加对晋北盐碱化草地土壤净氮矿化的影响[J]. 应用生态学报, 2021, 32(7): 2389-2396.

WANG Yan, DIAO Hua-jie, DONG Kuan-hu, WANG Chang-hui, ZHAO Wei. Effects of precipitation change and nitrogen addition on soil net N mineralization in a saline-alkaline grassland of Northern Shanxi Province, China[J]. Chinese Journal of Applied Ecology, 2021, 32(7): 2389-2396.

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降水变化与氮添加对晋北盐碱化草地土壤净氮矿化的影响

Effects of precipitation change and nitrogen addition on soil net N mineralization in a saline-alkaline grassland of Northern Shanxi Province, China

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