长期施肥对栗褐土有机碳含量及其组分的影响  

Effect of long-term fertilization on organic carbon fractions and contents of cinnamon soil

作　　者：王朔林 王改兰[1] 赵旭[1] 陈春玉[1] 黄学芳 

机构地区：[1]湖南农业大学资源环境学院,湖南长沙410128 [2]山西农业科学院旱地农业研究中心,山西太原030031

出　　处：《植物营养与肥料学报》2015年第1期104-111,共8页Journal of Plant Nutrition and Fertilizers

基　　金：国家国际科技合作专项(2011DFR31230)资助

摘　　要：【目的】作为土壤质量的重要指标,土壤有机碳及其组分在耕地生产力和作物产量方面发挥着重要作用。本文以25年长期定位施肥试验为依托,分析了不同施肥处理对栗褐土有机碳含量及其组分的影响,为调控农田土壤肥力及栗褐土有机碳库的管理提供科学依据。【方法】田间试验开始于1988年,设置8个施肥处理为不施肥(CK);单施氮肥(N);氮磷肥合施(NP);单施低量有机肥(M1);低量有机肥与氮肥合施(M1N);低量有机肥与氮磷肥合施(M1NP);高量有机肥与氮肥合施(M2N);高量有机肥与氮磷肥合施(M2NP)。于第25年玉米播种前,采集以上处理的耕层(0—20 cm)土壤样品。借助有机碳物理分组方法和化学分析方法,测定了土壤总有机碳和有机碳各组分的含量。【结果】长期施用不同肥料不同程度地提高了栗褐土总有机碳、游离态颗粒有机碳以及闭蓄态颗粒有机碳含量,其中有机肥与化肥配施尤其是高量有机肥与化肥配施的作用更加明显。与不施肥相比,高量有机肥与无机肥配施(M2N、M2NP)总有机碳含量增加了121.1%、166.8%,游离态颗粒有机碳增加了239.2%、359.2%,闭蓄态颗粒有机碳增加了288.4%、289.9%。单施氮肥(N)及有机肥与氮磷肥配施(M1NP、M2NP)可显著提高矿物结合态有机碳含量,增幅分别为27.8%、34.8%、33.3%。不施肥条件下,栗褐土有机碳中颗粒有机碳与矿物结合态有机碳所占的比例相当,长期施肥提高了颗粒有机碳特别是闭蓄态颗粒有机碳的比例,降低矿物结合态有机碳所占的比例,闭蓄态颗粒有机碳成为栗褐土有机碳的主要贮存库。相关分析表明,长期施肥条件下栗褐土游离态、闭蓄态颗粒有机碳含量之间及其与总有机碳含量之间均呈极显著正相关,矿物结合态有机碳含量与总有机碳及其他组分的有机碳之间均无明显相关。【结论】化肥、有机肥以及有机肥与化肥配施能够提高栗�【Objectives】As an essential indicator of soil quality,soil organic carbon and its fractions play an important role in land productive capacity and crop yield. Based on a 25- year long-term fertilization experiment,effects of different fertilizing treatments on the contents of total organic carbon and its fractions in cinnamon soil were analyzed to provide scientific basis for controls of soil fertility and organic carbon management. 【Methods】Since 1988,a field experiment was conducted with eight different fertilizing treatments,no fertilizer( CK),chemical N,chemical NP,low amount organic manure,low amount organic manure plus chemical N,low amount organic manure plus chemical NP,high amount organic manure plus chemical N and high amount organic manure plus chemical NP. At the 25 th year,soil samples at 0-20 cm depth of different fertilizing treatments were collectedbefore the sowing of maize. Contents of soil total organic carbon and its fractions were determined by physical partial size fractionation method and chemical analysis. 【Results】The results show that compared with no fertilizer application,the long-term different fertilizer application can increase the contents of total organic carbon,FPOM-C and OPOM-C in cinnamon soil,and the effect of manure combined with chemical fertilizer application,especially higher amount of manure with chemical fertilizer application is more significant. After the long-term application of M2 N and M2 NP,the contents of total organic carbon are increased by 121. 1% and 166. 8%,FPOM-C contents are increased by 239. 2% and 359. 2%,and OPOM-C contents are increased 288. 4% and 289. 9%. Compared with no fertilizer treatments,the treatments of N,M1 NP and M2 NP could be more suitable for the accumulation of MOMC,which are 27. 8%,34. 8%,33. 3% higher than that of no fertilizer treatment,respectively. The distribution proportions of POM-C and MOM-C in cinnamon soil are similar to those of the no fertilization. While under the long-term fertilizer application,the distributio

关 键 词：长期施肥 栗褐土 有机碳组分 相关分析 

分 类 号：S153.62[农业科学—土壤学]