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Dynamics of organic carbon and nitrogen in deep soil profile and crop yields under long-term fertilization in wheat-maize cropping system

文献类型： 外文期刊

作者： Qaswar, Muhammad 1 ; Li Dong-chu 1 ; Huang Jing 1 ; Han Tian-fu 1 ; Ahmed, Waqas 4 ; Ali, Sehrish 1 ; Khan, Muhammad Numan 1 ; Khan, Zulqarnain Haider 5 ; Xu Yong-mei 6 ; Li Qian 2 ; Zhang Hui-min 1 ; Wang Bo-ren 1 ; Tauqeer, Ahmad 8 ;

作者机构： 1.Chinese Acad Agr Sci, Natl Engn Lab Improving Qual Arable Land, Inst Agr Resources & Reg Planning, Beijing 100081, Peoples R China

2.Dalian Univ Technol, Sch Environm Sci & Technol, Key Lab Ind Ecol & Environm Engn, Dalian 116024, Peoples R China

3.Chinese Acad Agr Sci, Natl Observat Stn Qiyang Agriecol Syst, Inst Agr Resources & Reg Planning, Qiyang 426182, Peoples R China

4.Guangzhou Univ, Sch Environm Sci & Engn, Guangdong Prov Key Lab Radionuclides Pollut Contr, Guangzhou 510006, Peoples R China

5.Minist Agr & Rural Affairs, Agroenvironm Protect Inst, Tianjin 300191, Peoples R China

6.Xinjiang Acad Agr Sci, Inst Soil Fertilizer & Agr Water Conservat, Urumqi 830091, Peoples R China

7.Henan Univ Sci & Technol, Coll Agr, Luoyang 471000, Peoples R China

8.Dalian Univ Technol, Sch Chem Engn, Dalian 116024, Peoples R China

关键词： carbon stock; nitrogen stock; carbon fraction; soil profile; organic amendments; long-term experiment

期刊名称：JOURNAL OF INTEGRATIVE AGRICULTURE （ 影响因子：4.384； 五年影响因子：4.021 ）

ISSN： 2095-3119

年卷期： 2022 年 21 卷 3 期

页码：

收录情况： SCI

摘要： Soil organic carbon (SOC) and nitrogen (N) are two of the most important indicators for agricultural productivity. The primary objective of this study was to investigate the changes in SOC and N in the deep soil profile (up to 100 cm) and their relationships with crop productivity under the influence of long-term (since 1990) fertilization in the wheat-maize cropping system. Treatments included CK (control), NP (inorganic N and phosphorus (P) fertilizers), NPK (inorganic N, P and potassium fertilizers), NPKM (NPK plus manure), and M (manure). Crop yield and the properties of topsoil were measured yearly from 2001 to 2009. C and N contents were measured at five different depths in 2001 and 2009. The results showed that wheat and maize yields decreased between 2001 and 2009 under the inorganic fertilizer (NP and NPK) treatments. The average yield between 2001 and 2009 under the NP, NPK, NPKM, and M treatments (compared with the CK treatment) increased by 38, 115, 383, and 381%, respectively, for wheat and 348, 891, 2738, and 1 845%, respectively, for maize. Different long-term fertilization treatments significantly changed coarse free particulate (cfPOC), fine free particulate (ffPOC), intramicroaggregate particulate (iPOC), and mineral-associated (mSOC) organic carbon fractions. In the experimental years of 2001 and 2009, soil fractions occurred in the following order for all treatments: mSOC>cfPOC>iPOC>ffPOC. All fractions were higher under the manure application treatments than under the inorganic fertilization treatments. Compared to the inorganic fertilization treatments, manure input enhanced the stocks of SOC and total N in the surface layer (0-20 cm) but decreased SOC and N in the deep soil layer (80-100 cm). This reveals the efficiency of manure in increasing yield productivity and decreasing risk of vertical loss of nutrients, especially N, compared to inorganic fertilization treatments. The findings provide opportunities for understanding deep soil C and N dynamics, which could help mitigate climate change impact on agricultural production and maintain soil health.

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