摘要
在23 a的田间定位试验区,研究了长期施肥对水稻土颗粒有机碳和矿物结合态有机碳的影响。结果表明,在不施肥(CK)、无机肥(NPK)、有机肥(猪粪+紫云英绿肥)(OM)和无机肥与有机肥配施(NPKM)处理中,A层游离态和闭蓄态颗粒有机物含量比P层高,随着土层的加深呈下降的趋势;而矿物态有机物呈相反的趋势。增施有机肥(NPKM,OM处理)有利于提高土壤中游离态和闭蓄态颗粒有机物及其有机碳的含量以及占土壤有机碳的比例。团聚体中颗粒有机物占土壤团聚体重量的比例及颗粒有机物的有机碳含量均随着团聚体粒径的减小而明显增加。增施有机肥显著提高了团聚体特别是微团聚体(<0.25mm)中颗粒有机物及其有机碳的含量。团聚体中颗粒有机物的有机碳含量显著高于容积土壤中颗粒有机物的有机碳含量。这些结果表明微团聚体对颗粒有机物具有富集和保护作用。
A long-term field experiment was set in Jiangxi Institute of Red Soil （116 20′24″E,28°15′30″N ） in Jinxian county of Jiangxi province, China. One of the aims of the experiment was to investigate the effects of extensive use of various fertilizers over two decades on particulate organic carbon and mineral organic carbon of the paddy soil. The treatments on use of fertilizers were ： （ 1 ） no added fertiliser （CK） , （ 2 ） chemical fertilizers only （NPK） , （ 3 ） organic fertilizers only （OM） and （4） a combination of chemical and organic fertilisers （NPKM）. Results showed that the content of the free particulate organic matter （fPOM） and occluded particulate organic matter （oPOM） in A horizon was higher than that in P horizon and that the deeper in soil horizon the lower the content of the fPOM and oPOM was. However, the content of mineral organic matter （mOM） exhibited a reverse trend. Extensive use of organic fertilizers, or a combination of organic and inorganic fertilizers helped increase the contents of fPOM and oPOM, content of organic carbon within fPOM and oPOM, and overall carbon level of soil organic matter （SOC） in red paddy soil. The level of the POM in soil aggregates, the content of organic carbon in POM decreased significantly over the size groups： 0.05 ～ 0.25mm, 0.25 ～ 1mm, 1 ～ 3mm, 〉3mm. It was also found that contents of organic carbon of POM in size groups were higher than that in bulk soil. These results showed that micro-aggregates （〈0.25mm） enriched and maintain particulate organic matter of the red paddy soil.
出处
《生态学报》
CAS
CSCD
北大核心
2008年第1期353-360,共8页
Acta Ecologica Sinica
基金
国家自然科学基金重点资助项目(40231016)~~
关键词
施肥
水稻土
团聚体
颗粒有机碳
矿物结合态有机碳
fertilization
paddy soil
aggregates
particulate organic carbon
mineral organic carbon
