长期秸秆还田对白浆土有机碳含量及腐殖质组成的影响  

Effect of straw returning on content of organic carbon and compisition of humus in albic soils

作　　者：万晓晓[1] 石元亮[2] 依艳丽[1] 

机构地区：[1]沈阳农业大学,辽宁沈阳110866 [2]中国科学院沈阳应用生态研究所,辽宁沈阳110016

出　　处：《中国土壤与肥料》2012年第3期7-11,共5页Soil and Fertilizer Sciences in China

基　　金：国家科技支撑-三江平原白浆土农田土壤改良与水土调控技术集成与示范(2009BADB3B07);国家自然基金项目(41171192);农业部东北土壤与环境重点实验室

摘　　要：对白浆土秸秆还田(20、24、32年)后土壤有机碳含量及腐殖质组分进行测定,结果表明:与对照(CK)相比,秸秆还田后耕层(0～20 cm)与20～40 cm白浆土有机碳含量分别增加2.46～3.91、10.75～15.79g/kg。随还田年限增加,耕层与20～40 cm土壤水溶性物质在还田24年达最高值,分别为0.67、0.58 g/kg;而水浮性物质显著增加且在还田24～32年趋于稳定值。耕层土壤腐殖酸与胡敏酸含碳量均呈增加趋势,还田24年时最高,分别为10.04、5.51 g/kg;在20～40 cm土层则先增后减。耕层土壤富里酸含碳量先减后增,20～40 cm土壤富里酸含碳量则显著增加。耕层胡敏素含碳量呈减少趋势,而20～40 cm土壤则呈增加趋势。秸秆还田后白浆土胡富比发生较大变化,耕层土壤胡富比在还田24年时达到峰值1.22;而20～40 cm土层胡富比逐渐减小。Content of organic carbon and compisition of humus in albic soils after straw returned 20,24 and 32 years was assayed.The results showed that compared with contrast（CK）,content of organic carbon in top layer（0~20 cm）and 20~40 cm soil increased 2.46~3.91,10.75~15.79 g/kg respectively.With straw returned years increasing,in top layer and 20~40 cm soil concent of WFS carbon reached the peak of 0.67,0.58 g/kg separately when straw had been returning for 24 years,while content of WFS carbon was at equilibrium after straw returning for 24~32 years.In the top layer soil content of humus and humic acid carbon both increased which reached the peak of 10.04,5.51 g/kg separately when straw had been returning for 24 years,then they were at equilibrium after straw returning for 24~32 years,while in the 20 to 40 cm soil decreased.In top layer soil,the carbon concent of fulvic acid inceased first then decreased,while was a significant increase in 20 to 40 cm soil;The trend of concent of humin carbon was decrease in top layer soil and increase in 20~40 cm soil;The HA/FA changed greatly after straw return,HA/FA reached a peak of 1.22 when straw had been returning for 24 years,and in 20 to 40 cm soil HA/FA reduced gradually.

关 键 词：秸秆还田 白浆土 有机碳 腐殖质组成 

分 类 号：S141.4[农业科学—肥料学]