植物生态学报 >

2024 , Vol. 48 >Issue 2: 147 - 157

DOI: https://doi.org/10.17521/cjpe.2023.0230

研究论文

氮添加增加中国陆生植物生物量并降低其氮利用效率

  • 耿雪琪 ,
  • 唐亚坤 ,
  • 王丽娜 ,
  • 邓旭 ,
  • 张泽凌 ,
  • 周莹
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  • 1中国科学院教育部水土保持与生态环境研究中心, 中国科学院水利部水土保持研究所, 陕西杨凌 712100
    2中国科学院大学, 北京 100049
    3西北农林科技大学水土保持科学与工程学院, 陕西杨凌 712100
* (yktang@nwsuaf.edu.cn)

收稿日期: 2023-08-10

  录用日期: 2023-12-08

  网络出版日期: 2023-12-08

基金资助

国家自然科学基金(41977425)

收起

Nitrogen addition increases biomass but reduces nitrogen use efficiency of terrestrial plants in China

  • GENG Xue-Qi ,
  • TANG Ya-Kun ,
  • WANG Li-Na ,
  • DENG Xu ,
  • ZHANG Ze-Ling ,
  • ZHOU Ying
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  • 1The Research Center of Soil and Water Conservation and Ecological Environment, Chinese Academy of Sciences and Ministry of Education; Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100, China
    2University of Chinese Academy of Sciences, Beijing 100049, China
    3University of Chinese Academy of Sciences, Beijing 100049, China

Received date: 2023-08-10

  Accepted date: 2023-12-08

  Online published: 2023-12-08

Supported by

National Natural Science Foundation of China(41977425)

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摘要

研究植物整体和地上、地下部分生物量和氮利用效率(NUE)对氮添加的响应, 有助于了解全球氮沉降背景下中国陆地生态系统植物碳、氮循环的变化。然而氮添加对植物生物量和NUE的影响是否一致, 影响这种响应的主要因素仍不清楚。该研究收集整理了94篇已发表论文中有关中国氮添加实验的相关数据, 使用meta分析定量评估了氮添加对植物生物量分配和NUE的影响及其主要影响因素。结果表明: (1)氮添加在显著增加植物整体、地上和地下生物量的同时, 也显著降低了不同部分的NUE, 但植物地上生物量的增加幅度(34.0%)高于地下生物量(5.3%), 而地下部分NUE (29.9%)的下降幅度高于地上部分NUE (15.4%); (2)植物整体和不同部分生物量及其NUE对氮添加的响应在不同生态系统类型、氮肥形式、施氮水平、持续时间和水分条件下均存在显著差异, 且草地和荒漠生态系统对氮添加的响应明显高于其他生态系统类型; (3)影响植物整体、地上和地下生物量效应值的最主要因素均为土壤总氮含量, 植物整体和地上部分NUE的最主要影响因素均为施氮量, 而影响地下部分NUE效应值的最主要因素为氮肥形式。总之, 植物生物量和NUE在氮添加条件下的变化趋势相反, 两者分别主要受土壤总氮含量和施氮水平的影响。

关键词： meta分析; 土壤总氮; 氮添加; 生物量分配; 氮利用效率; 生态系统类型

本文引用格式

耿雪琪 , 唐亚坤 , 王丽娜 , 邓旭 , 张泽凌 , 周莹 . 氮添加增加中国陆生植物生物量并降低其氮利用效率[J]. 植物生态学报, 2024 , 48(2) : 147 -157 . DOI: 10.17521/cjpe.2023.0230

Abstract

Aims Studies on the adaptation of plant biomass and nitrogen use efficiency (NUE) to atmospheric nitrogen (N) deposition were helpful to understand the changes of carbon (C) and N cycling in terrestrial ecosystems under the background of global N deposition. However, the effects of N addition on plant biomass and NUE and the main factors affecting these responses remained unclear. Our objective was to explore the responses of biomass and NUE in the whole and different components of plants to N addition.

Methods We conducted a meta-analysis by collecting data from 94 publications focusing on N addition in China, to quantitatively assess the effects of N addition on biomass allocation and NUE of plants, as well as the main influencing factors.

Important findings The results showed that: (1) N addition significantly increased total, aboveground, and belowground biomass while significantly decreased the NUE of different components. Plant aboveground biomass (34.0%) increased more than that of belowground biomass (5.3%), and the decreased belowground NUE (29.9%) was higher than that of aboveground (15.4%). (2) The responses of plant biomass and NUE to N addition varied across ecosystem types, N forms, N addition levels, duration, and water conditions. The responses of plant in grassland and desert to N addition were significantly higher than that in other ecosystems. (3) Soil total N content was the most important factor affecting the responses of plant total, aboveground, and belowground biomass. The responses of plant and aboveground NUE were mainly modulated by N addition rate, and the form of N fertilizer mainly influenced the responses of belowground NUE. In conclusion, the effects of N addition on plant biomass and NUE were opposite, and they were mainly affected by soil total N content and N addition rate, respectively. These findings may provide reference for further research and practice on the distribution and utilization of C and N in plants under the background of N deposition.

Key words： meta-analysis; soil total nitrogen; nitrogen addition; biomass allocation; nitrogen use efficiency; ecosystem type

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