摘要
为阐明长期施肥对黄壤性水稻土有机碳平衡特征的影响,探讨土壤可持续利用培肥模式,收集2006-2011年10种施肥模式下(CK,1/4M+3/4NPK,1/2M+1/2NPK,M,NPKM,NPK,NK,N,NP,PK)的黄壤性水稻土,分析了各施肥模式下土壤有机碳平衡的变化特征。结果表明:长期施用有机肥情况下,各处理土壤有机碳含量较不施肥处理(CK)均显著增加;随着有机肥施用量的增加,有机碳含量逐渐增加,其中NPKM处理最高;不同施肥模式有机碳平衡变化较大,除1/4M+3/4NPK处理外,施有机肥处理土壤有机碳表现为盈余,且各处理间存在显著差异;不施肥和施用化肥处理的有机碳表现为亏缺;黄壤性水稻土有机碳平衡与系统总碳投入显著正相关(R2=0.9974),维持土壤有机碳平衡所需的最低碳投入量为每年2.7 t/hm2。研究区黄壤性水稻土有机碳尚未饱和,仍具一定的固碳潜力,施有机肥,尤其是有机肥与化肥配施可以提高土壤有机碳含量。
To estimate the effects of long-term fertilization on variation of soil organic carbon balance and discuss fertility maintaining mode for sustainable land use,the paddy soil from yellow earth treated with 10 fertilizations（ CK,1 /4M ＋ 3 /4NPK,1 /2M ＋ 1 /2NPK,M,NPKM,NPK,NK,N,NP,PK） were sampled from 2006 to 2011,and the soil organic carbon balance was analyzed. Results showed that the soil organic carbon content in manure treatments increased significantly compared to the CK treatment. The soil organic carbon content increased with the amount of manure fertilizer added,which reached a maximum in the NPKM treatment. Soil organic balance varied among different treatments,positive value was observed in treatments of 1 /2M ＋ 1 /2NPK,M and MNPK,while negative value was observed in other treatments. Positive linear correlation was observed between the soil organic balance and carbon input. 2. 7 t / hm2·a carbon was needed to keep the paddy soil organic carbon balance. We concluded that organic carbon in paddy soil from yellow earth remained unsaturated and had the potential to sequester more carbon. Manure fertilizer application,especially the combination of manure fertilizer and chemical fertilizer,could increase soil organic carbon.
出处
《西南农业学报》
CSCD
北大核心
2014年第6期2428-2431,共4页
Southwest China Journal of Agricultural Sciences
基金
公益性行业(农业)科研专项经费"粮食主产区土壤肥力演变与培肥技术研究与示范"(201203030)
贵州省科技计划"黄壤地力提升技术研究示范"(黔科合NY字[2012]3082号)
贵州省农业科学院研究生科研创新基金项目"不同施肥方式下黄壤有机碳储量变化及固碳潜力研究"(黔农科合[创新基金]2012016)
贵州省科技计划"贵州省农业资源高效利用技术创新能力建设"黔科合院所创能[2011]4002号
关键词
黄壤性水稻土
长期施肥
有机碳平衡
碳投入
Paddy soil from yellow earth
Long-term fertilization
Soil organic carbon balance
Carbon input
