摘要
以设施番茄栽培长期定位施肥土壤为研究对象,对1997~2013年不同施肥配比下土壤有机碳(soil organic carbon,SOC)的变化规律进行研究,并探讨土壤活性有机碳与速效养分间关系。结果表明:施用有机肥能显著提高土壤有机碳含量;长期单施氮肥的各个处理有机碳含量随施氮量的增加而增加,并随施用年限的增加,土壤有机碳呈增加趋势;2013年的结果显示单施氮肥、氮肥与磷肥配施、氮肥与磷钾肥配施处理较不施肥处理土壤有机碳含量提高9.9%~40.9%,这说明无机肥也有提高SOC含量的作用。施用有机肥,尤其是有机肥与无机肥配施条件下,易氧化有机碳(readily oxidized organic carbon,ROC)、水溶性有机碳(dissolved organic carbon,DOC)和微生物量碳(microbial biomass carbon,MBC)的含量明显提高,其中有机肥与氮磷钾肥配施的处理DOC和MBC的含量最高。轻组有机碳(light fraction organic carbon,LFOC)与土壤速效磷呈极显著的正相关(r0.01=0.634**,n=12);ROC与碱解氮、速效钾都呈极显著正相关,其中与碱解氮的相关性最好(r0.01=0.82**,n=12)。
In order to explore the dynamic changes of active soil organic carbon and its relationship with soil available nutrients,long-term different fertilization soil samples between 1997 and 2013 for protected tomato were systematically investigated. The results showed that application of organic fertilizer resulted in SOC content increase significantly. The content of organic carbon was increased with increasing application nitrogen and years. SOC in treatments with single N in BN1, BNP and BNPK increased9.9%-40.9% in 2013. Above-mentioned results indicated that suitable amount of inorganic fertilizer could result in SOC increase.Application of organic fertilizer resulted in ROC, DOC and MBC increase significantly. The results showed that different types of active organic carbon resulted in different available nutrients contribution. Obvious positive correlationship was found between LFOC and SAP(r0.01=0.634**,n =12). Significant positive correlationship also lied between ROC and SAN, SAK, especially for correlationship between ROC and SAN(r0.01=0.82**,n=12).
出处
《沈阳农业大学学报》
CAS
CSCD
北大核心
2014年第5期528-532,共5页
Journal of Shenyang Agricultural University
基金
国家星火计划项目(2012GA6500021)
国家科技成果转化项目(2012GB2B000091)
国家科技支撑计划项目(2013BAD20B08)
