干旱地区农业研究2024，Vol.42Issue(1)：205-213,9.DOI:10.7606/j.issn.1000-7601.2024.01.21
玉米秸秆还田下深松年限对土壤有机碳含量及胡敏酸结构特征的影响
Effects of subsoiling year on soil organic carbon content and humic acid structure characteristics under maize straw mulching and returning
摘要
Abstract
To clarify the changes in soil organic carbon components under different straw return tillage meas-ures,this study was based on a 6-year long-term positioning experiment with straw return.Using three-dimensional fluorescence spectroscopy technology and in the conditions of CK(non-subsoiling and no straw returning),NFG(non-subsoiling and straw returning),EFG(subsoiling every other year and straw returning),TFG(every two years of subsoiling+straw returning)and SFG(consecutive years of subsoiling+straw returning),the content of soil organic carbon(SOC)and structural characteristics of humic acid(HA)were analyzed.The results showed that compared with CK,the SOC,HA content and PQ value of the 0～10 cm soil layer treated with EFG significantly increased by 25.23％,16.19％,and 4.27％,respectively,while the FA content decreased by 4.55％.In the soil layer of 10～20 cm,EFG treatment had the highest SOC content,which increased by 13.18％compared to CK.The HA and FA content of SFG treatment increased the most compared to CK,with an increase of 13.27％and 32.74％,respectively.Through the 3D fluorescence spectrum of HA,it was found that compared with CK(Ex/Em=270/455,270/460),the HA fluorescence peak wavelength in the 0～10 cm and 10～20 cm soil layers under EFG(Ex/Em=280/455,270/465)treatment showed a red shift phenomenon.Soil humic acid contains two compo-nents,C1(Ex/Em=270/280)and C2(Ex/Em=440/515),which were both humic acid like substances.Humic acid had a high degree of overall humification and a complex structure.The C2 component treated with EFG and TFG accounted for the highest proportion,with 28.59％and 31.38％,respectively.The Fmax values of C1 and C2 components in each treatment increased compared to CK,indicating an increase in humification degree.In summa-ry,EFG treatment(subsoiling every other year and straw returning)enhanced the content of soil organic carbon and humic acid substances,increased the degree of humification,and strengthened the soil's fertilizer supply ca-pacity,making it a better cultivation technical measure in the black soil area of Heilongjiang.关键词
玉米秸秆还田/深松/土壤有机碳/胡敏酸/三维荧光光谱Key words
maize straw mulching and returning/subsoiling/soil organic carbon/humic acid/three-dimen-sional fluorescence spectroscopy分类
农业科技引用本文复制引用
高盼,王宇先,蔡姗姗,徐莹莹,杨慧莹,王晨,张巩亮..玉米秸秆还田下深松年限对土壤有机碳含量及胡敏酸结构特征的影响[J].干旱地区农业研究,2024,42(1):205-213,9.基金项目
黑龙江省省属科研院所科研业务费项目(CZKYF2021-2-C021) （CZKYF2021-2-C021）
黑龙江省农业科学院"农业科技创新跨越工程"专项(HNK2019CX12-06) （HNK2019CX12-06）
齐齐哈尔市科技计划创新激励项目(CNYGG-2023029) （CNYGG-2023029）
国家农业环境齐齐哈尔观测实验站项目(NAES058AE10) （NAES058AE10）
