夏闲期复播绿肥对旱地麦田土壤团聚体碳氮含量的影响  

Effects of Green Manure Application on Soil Organic Carbon and Nitrogen Content Among Aggregates Fractions in Dryland Wheat Fields

作　　者：祁琛 吴林甲 闫秋艳 闫双堆[1] 董飞 李峰 程永钢 黄肖 QI Chen;WU Lingjia;YAN Qiuyan;YAN Shuangdui;DONG Fei;LI Feng;CHENG Yonggang;HUANG Xiao(College of Resources and Environment,Shanxi Agricultural University,Taigu,Shanxi 030801;Institute of Wheat Research,Shanxi Agricultural University,Linfen,Shanxi 041000;Key Laboratory of Soil Environment and Nutrient Resources of Shanxi Province,Taiyuan,Shanxi 030031)

机构地区：[1]山西农业大学资源环境学院,山西太谷030801 [2]山西农业大学小麦研究所,山西临汾041000 [3]山西省土壤环境与养分资源重点实验室,太原030031

出　　处：《水土保持学报》2023年第4期304-312,共9页Journal of Soil and Water Conservation

基　　金：国家绿肥产业技术体系项目(CARS-22);山西省土壤环境与养分资源重点实验室开放基金项目(2020002);国家自然科学基金项目(U22A20609)。

摘　　要：为探究不同绿肥品种翻压条件下晋南旱地麦田土壤团聚体稳定性以及有机碳(SOC)和全氮(TN)在不同粒径团聚体的分布特征,深入了解不同种类绿肥的增碳保氮机制。已连续3年(2018—2021年)不同绿肥品种(对照休闲、大豆、绿豆、油葵、玉米)翻压还田后冬小麦收获期0-10,10-20,20-30 cm土壤为研究对象,采用湿筛法进行土壤粒径分级,并分析粗大团聚体(>2 mm)、细大团聚体(0.25~2 mm)、微团聚体(0.053~0.25 mm)和粉黏粒组分(<0.053 mm)中SOC和TN含量,测算团聚体的构成与稳定性(R 0.25,>0.25 mm团聚体含量;MWD,平均重量直径;GMD,几何平均直径),并测定各粒径团聚体SOC和TN及其对土壤总有机碳和总氮的贡献率。结果表明:不同绿肥处理下旱地麦田土壤团聚体质量占比均以细大团聚体0.25~2 mm为主(占22.77%~39.71%)。复播绿肥显著增加0-30 cm土层>2 mm粒径团聚体质量占比,以大豆绿肥增加最明显,0.25~2,0.053~0.25 mm粒径团聚体质量占比降低,对<0.053 mm粉黏粒的影响不明显;大豆绿肥对各土层R 0.25、MWD和GMD值提高作用明显。大豆和玉米对0-30 cm各土层土壤总有机碳含量具有显著提高作用,分别提高27.83%和25.71%。大豆绿肥进一步提高土壤各粒径团聚体有机碳含量。复播绿肥降低土壤全氮含量,大豆绿肥处理的降低程度最小,且对<0.053 mm粉黏粒全氮含量具有增加作用。0.25~2,>2 mm大团聚体对0-10 cm土层土壤有机碳和全氮的贡献率最高;复播绿肥提升土壤碳氮比(平均21.39),较对照休闲(平均13.71)提高7.68,其中玉米提升效果最佳,大豆次之。综合土壤增碳固氮效果,连续3年翻压大豆绿肥可有效提高旱地麦田土壤团聚体稳定性,提升土壤肥力。In order to investigate the stability of soil aggregates and the distribution characteristics of organic carbon(SOC)and total nitrogen(TN)aggregates in different particle sizes under different green manures application in dryland wheat fields in southern of Shanxi Province,and further understand the mechanism of carbon and nitrogen conservation of different green manures.Topsoil samples of 0-10,10-20 and 20-30 cm after three consecutive years(2018—2021)during the winter wheat harvest period were collected under different green manure treatments(control,soybean,mung bean,sunflower,maize).Wet sieve method was used to classify the soil particle size.The contents of SOC and TN in coarse macroaggregates(>2 mm),fine macroaggregates(0.25~2 mm),microaggregates(0.053~0.25 mm)and silt+clay(<0.053 mm),and the stability of aggregates(R 0.25,aggregates mass fractions of>0.25 mm;MWD,mean weight diameter;GMD,geometric mean diameter)were measured.The contribution rates of aggregate SOC and TN to soil total organic carbon and total nitrogen of different particle sizes were measured.The results showed that the proportion of soil aggregate mass of fine and large aggregates was mainly 0.25~2 mm(22.77%~39.71%)under different green manure treatments.Aggregates mass fractions of>2 mm in 0-30 cm soil layer was significantly increased under green manure application,especially under soybean green manure,while the mass proportion of 0.25~2 mm and 0.053~0.25 mm particle size decreased,the mass proportion of<0.053 mm showed no obvious.Soybean green manure significantly increased R 0.25,MWD and GMD values in all soil layers.Soybean and maize significantly increased the soil total organic carbon content in 0-30 cm soil layers by 27.83%and 25.71%,respectively.Soybean green manure further increased the content of SOC in soil aggregates of different particle sizes.Applying green manure reduced the soil total nitrogen content,soybean green fertilizer treatment had the smallest reduction degree,and had an effect on increasing the total nitrogen c

关 键 词：旱地麦田 绿肥品种 土壤团聚体 有机碳 全氮 

分 类 号：S152.4[农业科学—土壤学]