施氮磷肥对杉木人工林土壤活性有机碳的影响  

Effects of N and P fertilization on soil labile organic carbon fractions in Cunninghamia lanceolata plantations in mid-subtropics

作　　者：俞有志 王清奎[1,3] 于小军[3] 郑文辉[1,2] YU You-zhi;WANG Qing-kui;YU Xiao-jun;ZHENG Wen-hui(CAS Key Laboratory of Forest Ecology and Management,Institute of Applied Ecology,Chinese Academy of Sciences,Shenyang 110016,China;Huitong Experimental Station of Forest Ecology,Chinese Academy of Sciences,Huitong 418307,Hunan,China;University of Chinese Academy of Sciences,Beijing 100049.China）.)

机构地区：[1]中国科学院森林生态与管理重点实验室,沈阳110016 [2]中国科学院大学,北京100049 [3]中国科学院会同森林生态试验站,湖南会同418307

出　　处：《生态学杂志》2018年第10期3053-3060,共8页Chinese Journal of Ecology

基　　金：国家自然科学基金面上项目(31570466)资助

摘　　要：为确定施氮、磷肥对中亚热带人工林土壤不同活性组分有机碳的影响,本研究在5年生杉木(Cunninghamia lanceolata)人工林中设置氮、磷施肥试验,包括对照(CK)、施氮肥(200 kg N·hm^(-2)·a^(-1))、施磷肥(50 kg P·hm^(-2)·a^(-1))、施氮磷肥(200 kg N·hm^(-2)·a^(-1)+50kg P·hm^(-2)·a^(-1)) 4个处理。连续施肥5年后,采取(0~10 cm)表层土壤,测定了活性有机碳不同组分的变化。结果表明:施肥对土壤有机碳(SOC)影响不显著,施氮肥和氮磷配施使土壤微生物量碳(MBC)分别降低34.6%和45.8%,施氮肥降低了常温浸提水溶性有机碳(WSOC)含量,且施氮磷肥对WSOC有交互作用,施氮磷肥使热水浸提有机碳(HWC)含量显著提高了31.5%,施肥对易氧化有机碳(LOC)、颗粒有机碳(POC)、热水浸提碳水化合物(HWc C)的影响不显著;在施肥处理下,MBC/SOC对单施磷肥和氮肥不敏感,氮磷配施使MBC/SOC下降了48.4%,与CK相比,施氮磷肥对POC/SOC没有影响,但与氮肥处理相比,施氮磷肥使POC/SOC显著增加了24.3%;经相关性分析,HWC与硝态氮、有效磷呈显著或极显著正相关。To understand the effects of nitrogen（ N） and phosphate（ P） fertilization on different fractions of labile soil organic carbon（ SOC） in mid-subtropical forests,an experiment was conducted in Cunninghamia lanceolata plantations with treatments of N（ 200 kg N·hm^-2·a^-1）,P（ 50 kg P·hm^-2·a^-1）,NP（ 200 kg N·hm^-2·a^-1 plus 50 kg P·hm^-2·a^-1） and the control without fertilization（ CK）. Different fractions of labile SOC were measured after five years of fertilization. Fertilization had no significant effects on SOC concentration. In comparison with CK,the microbial biomass carbon was decreased by 34. 6% and 45. 8% in N and NP treatments respectively. Nitrogen fertilization decreased the WSOC concentration. Furthermore,the HWC concentration was significantly increased by 31. 5% in N treatment. MBC/SOC decreased by48.4% in NP treatment. The POC/SOC significantly increased by 24. 3% in NP-fertilized plots compared with N-fertilized plots. HWC was significantly positively correlated to nitrate and available P concentrations.

关 键 词：施肥 微生物量碳 热水浸提有机碳 热水浸提碳水化合物 

分 类 号：S714.2[农业科学—林学]