中国农业科学 ›› 2022, Vol. 55 ›› Issue (6): 1159-1171.doi: 10.3864/j.issn.0578-1752.2022.06.009

• 土壤肥料·节水灌溉·农业生态环境 • 上一篇    下一篇

长期施用有机肥情景下华北平原旱地土壤固碳及N2O排放的空间格局

王树会1,2(),陶雯3,梁硕1,2,张旭博3(),孙楠1(),徐明岗1   

  1. 1中国农业科学院农业资源与农业区划研究所/农业农村部耕地质量监测与评价重点实验室,北京 100081
    2Gembloux Agro-Bio Tech, University of Liege, Passage des deportes 2, Gembloux 5030, Belgium
    3中国科学院地理科学与资源研究所/生态网络观测与模拟重点实验室,北京 100101
  • 收稿日期:2021-02-26 接受日期:2021-08-12 出版日期:2022-03-16 发布日期:2022-03-25
  • 通讯作者: 张旭博,孙楠
  • 作者简介:王树会,Tel:18801084605;E-mail: shuhuiwang0512@163.com
  • 基金资助:
    国家自然科学基金(41620104006);国家自然科学基金(41701333);中央级公益性科研院所基本科研业务费专项(Y2017LM06)

The Spatial Characteristics of Soil Organic Carbon Sequestration and N2O Emission with Long-Term Manure Fertilization Scenarios from Dry Land in North China Plain

WANG ShuHui1,2(),TAO Wen3,LIANG Shuo1,2,ZHANG XuBo3(),SUN Nan1(),XU MingGang1   

  1. 1Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences/Key Laboratory of Arable Land Quality Monitoring and Evaluation, Ministry of Agriculture and Rural Affairs, Beijing 100081
    2Gembloux Agro-Bio Tech, University of Liege, Passage des deportes 2, Gembloux 5030, Belgium
    3Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences/Key Laboratory of Ecosystem Network Observation and Modeling, Beijing 100101
  • Received:2021-02-26 Accepted:2021-08-12 Online:2022-03-16 Published:2022-03-25
  • Contact: XuBo ZHANG,Nan SUN

摘要:

【目的】研究施用有机肥对农田土壤固碳及温室气体排放的综合影响,为减缓全球气候变暖提供理论指导。【方法】基于长期定位试验点观测数据,利用验证后的机理过程模型——SPACSYS,结合区域数据库及ArcGIS,模拟2010—2050年华北平原旱地3种施肥情景(等氮量)即单施化肥情景(NPK)、50%化肥配施50%有机肥情景(NPKM(5:5))和30%化肥配施70%有机肥情景(NPKM(3:7))下,土壤年均固碳速率(SOCSR)、土壤N2O年均排放量和年均净全球增温潜势(NGWP)的空间格局。【结果】华北平原旱地SOCSR表现为东部较高、西部较低,较高的地区主要包括江苏省和山东省。相关分析结果表明,SOCSR与初始土壤有机碳含量呈显著负相关,逐步线性回归分析进一步表明,初始土壤有机碳含量、年均温和土壤pH是影响SOCSR的3个重要因子,共解释其变异的24%。土壤N2O年均排放量表现为中部较高、北部和南部较低,较高的地区主要包括山东省部分地区和江苏省。相关分析结果表明,土壤N2O年均排放量与初始土壤有机碳含量呈显著正相关。总体来看,与NPK情景相比,NPKM(5:5)和NPKM(3:7)两种情景均增加华北平原旱地SOCSR、降低土壤N2O年均排放量,其中SOCSR(233和236 kg C·hm-2·a-1)分别增加了79%和82%,土壤N2O年均排放量(15.8和14.4 kg N·hm-2·a-1)分别降低了21%和28%,NGWP(6.6和5.9 t CO2-eq·hm-2·a-1)分别降低了26%和34%。【结论】长期来看,相比传统的单施化肥模式,化肥配施有机肥有利于华北平原旱地土壤固碳、土壤N2O减排和减缓温室效应。

关键词: 华北平原, 有机肥, 土壤固碳速率, N2O排放, 模型

Abstract:

【Objective】To provide theoretical guidance for mitigating global warming, the comprehensive effects of manure amendment on soil organic carbon sequestration and greenhouse gas emissions were studied.【Method】Based on the long-term experiment, the validated process-based model-SPACSYS, combined with regional database and ArcGIS, was used to clarify the spatial characteristics of average annual soil organic carbon sequestration rate (SOCSR), average annual soil N2O emission and average annual net global warming potential (NGWP) under three long-term fertilization scenarios (equal nitrogen fertilization), namely, chemical fertilizers only (NPK), 50% of chemical fertilizers combined with 50% of manure (NPKM(5:5)) and 30% of chemical fertilizers combined with 70% of manure (NPKM(3:7)), from dry land in the North China Plain from 2010 to 2050.【Result】The SOCSR from dry land in the North China Plain was higher in the east and lower in the west, and the higher regions mainly included Jiangsu Province and Shandong Province. Correlation analysis showed that there was a significant negative correlation between SOCSR and initial soil organic carbon content. Stepwise linear regression analysis further indicated that initial soil organic carbon content, mean annual temperature and soil pH were three important factors affecting SOCSR, which accounted for 24% of the variation of SOCSR. The average annual soil N2O emission was higher in the central part of the North China Plain, lower in the north and south, and the higher regions included parts of Shandong Province and Jiangsu Province. Correlation analysis showed that there was a significant positive correlation between average annual soil N2O emission and initial soil organic carbon content. In general, compared with NPK, NPKM(5:5) and NPKM(3:7) both increased SOCSR and decreased average annual soil N2O emission from dry land in the North China Plain, of which SOCSR (233 and 236 kg C·hm-2·a-1) increased by 79% and 82%, respectively, the average annual soil N2O emission(15.8 and 14.4 kg N·hm-2·a-1) decreased by 21% and 28%, respectively. As a result, NGWP (6.6 and 5.9 t CO2-eq·hm-2·a-1) decreased by 26% and 34%, respectively.【Conclusion】Compared with the application of chemical fertilizers, the application of chemical fertilizers combined with manure was beneficial to SOC sequestration, soil N2O emission reduction and mitigation of glowing warming from dry land in the North China Plain over the long-term.

Key words: North China Plain, manure, soil organic carbon sequestration rate, N2O emission, model