5种绿肥在柑橘地的腐解及养分释放特征  

Decomposition and Nutrient Release of Five Green Manures in Citrus Field

作　　者：唐红琴 何铁光 董文斌 韦彩会 曾成城 蒙炎成 李忠义 TANG Hongqin;HE Tieguang;DONG Wenbin;WEI Caihui;ZENG Chengcheng;MENG Yancheng;LI Zhongyi(Agricultural Resource and Environment Research Institute,Guangxi Academy of Agricultural Sciences,Nanning,Guangxi 530007,China)

机构地区：[1]广西壮族自治区农业科学院农业资源与环境研究所,广西南宁530007

出　　处：《福建农业学报》2021年第6期719-727,共9页Fujian Journal of Agricultural Sciences

基　　金：国家现代农业产业技术体系建设项目(CARS-22);广西重点研发计划项目(桂科AB18221122);南宁市西乡塘区科技计划项目(2019021401);广西农业科学院科技发展基金(桂农科2021YT037/2020YM112);广西特色作物试验站项目(TS202117);广西科技先锋队强农富民“六个一”专项项目(桂农科盟202013)。

摘　　要：【目的】研究绿肥在柑橘地还田后腐解及养分释放动态特征,为绿肥在橘园的生产和应用提供技术依据。【方法】应用尼龙网袋法,在柑橘地采用拉巴豆、紫云英、光叶苕子、紫花苜蓿、黑麦草等5种绿肥进行翻压还田,还田深度为20 cm,并分别于还田后的第20、40、60、80、100 d对5种绿肥样品进行取样,对样品中的碳、氮、磷、钾元素含量进行分析,研究5种绿肥的碳氮比、腐解规律以及养分释放特征。【结果】5种绿肥的腐解及养分释放均表现前期(0~20 d)快,中后期(20~100 d)慢的特征。腐解至20 d,5种绿肥腐解率达到35.52%~73.96%,腐解至100 d,腐解率达79.13%~90.25%。腐解至20 d,5种绿肥的C、N、P、K的释放率分别为38.10%~78.59%、66.92%~87.63%、28.60%~80.92%、80.22%~96.72%;腐解至100 d时,5种绿肥的C、N、P、K的释放率分别为80.90%~95.48%、94.63%~97.64、59.66%~96.28%、94.46%~99.64%,养分累计释放率表现为钾>氮>碳>磷。5种绿肥的碳氮比随腐解的进行大致呈现上升的趋势。【结论】5种绿肥还田后,紫云英的累计腐解率最高,拉巴豆的N和K累计释放率最高,黑麦草的C和P累计释放率最高。【Objective】Decomposition and nutrient release of green manure after returning to soil in citrus field were studied.【Method】Using nylon mesh bags to contain Dolichos lablab,Astragalus sinicus,Viciavillosa Rothvar,Medicago sativa,or Lolium multiflorum and plowed into the soil at a depth of 20 cm.Soil samples were taken on the 20th,40th,60th,80th,and 100th day after manure turning over to determine carbon,nitrogen,phosphorus,and potassium contents.Carbon/nitrogen ratio,material degradation,and nutrient release were tabulated for analysis.【Result】The manure decomposition and nutrient release were at a high rate in 0–20 d after the deposit but slowed down from the 20th to the 100th day.The rate of material decay reached 35.52%–73.96%after 20 d,and 79.13%–90.25%after 100 d.For the 5 green manures,the releases of C,N,P,and K ranged 38.10%–78.59%,66.92%–87.63%,28.60%–80.92%,and 80.22%–96.72%,respectively,in 20 d,and 80.90%–95.48%,94.63%–97.64,59.66%–96.28%,and 94.46%–99.64%,respectively,in 100 d.The cumulative nutrient release was K>N>C>P,and the C/N ratio increased as the decomposition progressed.【Conclusion】Among the 5 green manures,A.sinicus displayed the highest cumulative decay rate,D.lablab the most cumulative N and K releases,and L.multiflorum the greatest cumulative C and P releases.

关 键 词：绿肥 还田 腐解 养分释放 

分 类 号：S142[农业科学—肥料学]