黑土与潮土铁氧化物结合态有机碳对长期秸秆还田的响应  

Effect of Long-Term Straw Returning on the Soil Organic Carbon Bound to Iron Oxides in Black Soil and Fluvo-Aquic Soil

作　　者：孙悦 任科宇 邹洪琴 高洪军[2] 张水清[3] 李德近 李冰洁 廖楚芊 段英华[1] 徐明岗[1,5] SUN Yue;REN KeYu;ZOU HongQin;GAO HongJun;ZHANG ShuiQing;LI DeJin;LI BingJie;LIAO ChuQian;DUAN YingHua;XU MingGang(Institute of Agricultural Resources and Regional Planning,Chinese Academy of Agricultural Sciences/State Key Laboratory of Efficient Utilization of Arid and Semi-arid Arable Land in Northern China,Beijing 100081;Institute of Agricultural Resources and Environment Research,Jilin Academy of Agricultural Sciences,Changchun 130033;Institute of Plant Nutrition and Environmental Resources Science,Henan Academy of Agricultural Sciences,Zhengzhou 450002;College of Ecology and Environment,Nanjing Forestry University,Nanjing 210037;Engineer and Technology Academy of Ecology and Environment,Shanxi Agricultural University,Taiyuan 030031)

机构地区：[1]中国农业科学院农业资源与农业区划研究所/北方干旱半干旱耕地高效利用全国重点实验室,北京100081 [2]吉林省农业科学院农业资源与环境研究所,长春130033 [3]河南省农业科学院植物营养与资源环境研究所,郑州450002 [4]南京林业大学生态与环境学院,南京210037 [5]山西农业大学生态环境产业技术研究院,太原030031

出　　处：《中国农业科学》2024年第19期3823-3834,共12页Scientia Agricultura Sinica

基　　金：国家重点研发计划(2022YFD1500301);中国农业科学院创新工程(CAAS-CSAL-202302)。

摘　　要：【目的】旨在探究不同旱地土壤中不同类型铁氧化物结合态有机碳含量和性质的差异及其对长期秸秆还田的响应。【方法】基于1990年开始位于我国吉林公主岭和河南郑州的黑土和潮土长期定位施肥试验,选择长期定位试验中的不施肥对照(CK)、单施化肥(NPK)和化肥+秸秆还田(NPKS)3个处理进行。通过连续浸提法获取土壤中络合铁(Fe_(PP))、非晶型铁氧化物(Fe_(HH))及晶型铁氧化物(Fe_(DH)),探究不同形态铁氧化物及其结合态有机碳的含量差异;结合紫外可见光谱分析,探究铁氧化物结合态有机碳的性质差异。【结果】与CK及NPK处理相比,NPKS处理下黑土有机碳含量显著提高了18.1%和14.9%,潮土有机碳含量显著提高了46.1%和13.3%。两种土壤中Fe_(PP)含量均低于Fe_(HH)及Fe_(DH)含量,但络合铁结合态有机碳(OC_(PP))含量明显高于非晶型铁氧化物结合态有机碳(OC_(HH))及晶型铁氧化物结合态有机碳(OC_(DH))含量,可占总铁氧化物结合态有机碳含量的71.4%—93.2%,说明OC_(PP)是铁氧化物结合有机碳的主要存在形态。与NPK相比,NPKS处理黑土中Fe_(PP)含量显著降低了65.6%,Fe_(HH)含量显著降低了17.8%,Fe_(DH)含量没有显著变化;潮土中Fe_(PP)含量显著增加了15.9%,Fe_(HH)含量没有显著变化,Fe_(DH)含量显著提高了24.6%。NPKS较NPK处理显著降低了黑土中总铁氧化物结合有机碳的含量,其中OC_(PP)降低了11.3%,OC_(DH)增加了53.7%,OC_(HH)没有显著变化,而对潮土中总铁氧化物结合有机碳含量没有显著影响。进一步对每克铁氧化物结合有机碳含量的分析发现,与NPK相比,NPKS处理显著增加了黑土中3种铁氧化物结合有机碳的能力,而对潮土中结合有机碳的能力没有显著影响。Fe_(PP)主要与疏水性较强、芳香性较弱的大分子有机碳结合,Fe_(HH)主要与疏水性、芳香性均较强的小分子有机碳结合,而Fe_(DH)主要与一些疏水性及芳香性均较差【Objective】The purpose of this study was to explore the differences in the content and properties of different types of iron oxide bound organic carbon in different dryland soils and their responses to long-term straw returning.【Method】Based on the long-term fertilization experiments of black soil and fluvo-aquic soil in Gongzhuling,Jilin Province and Zhengzhou,Henan Province since 1990,soil samples under no fertilization(CK),single application of chemical fertilizer(NPK)and chemical fertilizer+straw returning(NPKS)for 29 years were collected,and the complex iron(Fe_(PP)),amorphous iron oxides(Fe_(HH))and crystalline iron oxides(Fe_(DH))were obtained through continuous extraction method.The differences in the content of different forms of iron oxides and their bound organic carbons were explored.Combined with ultraviolet-visible spectroscopy,the differences in the properties of iron oxide-bound organic carbon were also accessed.【Result】Compared with CK and NPK treatments,the soil organic carbon content under NPKS treatment in black soil was significantly increased by 18.1%and 14.9%,respectively,and fluvo-aquic soil was significantly increased by 46.1%and 13.3%,respectively.The content of Fe_(PP) in the two soils were lower than those under Fe_(HH) and Fe_(DH),but the content of complexed iron-bound organic carbon(OC_(PP))were significantly higher than those of amorphous iron oxide-bound organic carbon(OC_(HH))and crystalline iron oxide-bound organic carbon(OC_(DH)),accounting for 71.4%-93.2%of the total iron oxide-bound organic carbon content,indicating that OC_(PP) was the main form of iron oxide-bound organic carbon.Compared with NPK treatment,the Fe_(PP) content in black soil was significantly reduced by 65.6%.Fe_(HH) content was significantly reduced by 17.8%,and Fe_(DH) content was not significantly changed under NPKS treatment,while the Fe_(PP) content in fluvo-aquic soil was significantly increased by 15.9%.Fe_(HH) content was not significantly changed,and Fe_(DH) content was significantly incr

关 键 词：长期秸秆还田 土壤有机碳 有机碳性质 铁氧化物 

分 类 号：S141.4[农业科学—肥料学]