摘要
通过4年大田定位试验，研究不同施肥措施（单施化肥，化肥＋畜禽粪肥，化肥＋秸秆还田，化肥＋绿肥）对白土区稻田土壤总有机碳、水溶性有机碳、易氧化有机碳和颗粒有机碳等活性有机碳组分的影响。结果表明：相对于单施化肥，增施有机肥能显著提高总有机碳和各组分活性有机碳含量，其中秸秆还田处理的总有机碳、易氧化有机碳和颗粒有机碳含量均最高，增加幅度分别为19．6％、67．4％和15．7％；增施畜禽粪肥处理的水溶性有机碳含量最高，增幅为60．9％；不同施肥措施对易氧化有机碳占总有机碳比例的影响高于水溶性有机碳和颗粒有机碳；秸秆还田等有机培肥措施显著提高土壤碳库指数，较对照提高17．6％～85．2％。相关性分析表明：总有机碳、碳库管理指数与各组分活性有机碳间均表现出显著或极显著正相关，相关系数分别为0．691～0．824和0．593～0．803；不同有机碳组分和碳库管理指数与碱解氮和速效钾之间呈显著或极显著相关，与速效磷间仅水溶性有机碳表现出极显著正相关，相关系数为0．816。可见，白土稻田上增施有机肥能不同程度地提高总有机碳、活性有机碳含量和碳库管理指数，相对于易氧化有机碳和颗粒有机碳，水溶性有机碳对白土稻田施肥措施的反应更为敏感。
A four-year field experiment was conducted to study the effects of different fertilization practices on soil total organic carbon （TOC）, water-soluble organic carbon （WSOC） , easily oxi- dizable organic carbon （EOC）, and particle organic carbon （POC） in paddy field of white soil. The fertilization treatments included chemical fertilizer, chemical fertilizer plus farmyard manure, chemical fertilizer plus wheat straw, and chemical fertilizer plus green manure. The results showed that, compared with chemical fertilizer, the amendment of organic manure significantly increased the contents of TOC and labile organic carbon （LOC） , and the highest contents of TOC, EOC and POC were found in chemical fertilizer plus wheat straw treatment, with increases of 19.6%, 67.4% and 15.7%, respectively. The content of WSOC in chemical fertilizer plus far- myard manure treatment was highest, with an increase of 60.9% as compared to the control. Dif- ferent fertilization practices had greater effects on the proportion of EOC than on that of WSOC and POC. Compared with single chemical fertilizer, the amendments of wheat straw, farmyard manure and green manure significantly increased the carbon management index （CMI） by 17.6%-85.2%. Correlation analysis showed the relationships between TOC, CMI and LOC were significant or extremely significant, with correlation coefficients of 0.691-0.824 and 0.593-0.803, respectively. Different organic carbon components and CMI were significantly related to available nitrogen and potassium, while only WSOC was significantly related to available phos- phorus, with a correlation coefficient of 0.816. Therefore, the amendment of organic manure can increase the contents of TOC, LOC and CMI in white soil. Compared with EOC and POC, WSOC may be more sensitive to the changes of fertilization practices in white soil.
出处
《生态学杂志》
CAS
CSCD
北大核心
2015年第12期3474-3479,共6页
Chinese Journal of Ecology
基金
"十二五"国家科技支撑计划项目(2012BAD05B0206)
公益性行业(农业)科研专项(201003016
201503118)
安徽省农科院创新基金项目(11C1007
13B1042)资助
关键词
白土
施肥措施
活性有机碳
碳库管理指数
white soil
fertilization
labile organic carbon
carbon management index
