长期不同施肥处理对红壤性水稻土团聚体中碳、氮分布的影响  

Effects on Distributions of Carbon and Nitrogen in a Reddish Paddy Soil under Long-term Different Fertilization Treatments

作　　者：陈惟财[1,2] 王凯荣[1,3] 谢小立[1] 

机构地区：[1]中国科学院亚热带农业生态研究所,湖南长沙410125 [2]中国科学院研究生院,北京100049 [3]青岛农业大学农业生态与环境健康研究所,山东青岛266109

出　　处：《土壤通报》2009年第3期523-528,共6页Chinese Journal of Soil Science

基　　金：中国科学院知识创新工程重要方向项目(KZCX3-SW-441)资助

摘　　要：17年定位试验研究的结果表明,在长期不同施肥模式下,红壤性水稻土耕作层、犁底层干筛团聚体均以>5mm粒径为主,且其含量在有机物还田处理中更低;湿筛团聚体(水稳定性团聚体)在耕作层以>5mm粒径含量最高,在犁底层以<0.25mm粒径含量最高。同一土壤层水稳定性团聚体中有机碳、全氮含量因粒径而异,在耕作层,二者均富集于>1mm粒径,且以5～2mm粒径中含量最高;在犁底层,以>5mm粒径有机碳、全氮含量最高,然后随粒径减小而逐渐下降。随粒径从大到小变化,不同施肥处理耕作层水稳定性团聚体中C/N比均表现出由小变大,然后逐渐减小的特征,在2～1mm粒径出现峰值;犁底层水稳定性团聚体中C/N比表现出逐渐下降的趋势。长期有机物还田,尤其与化肥配施,可显著提高耕作层有机碳与全氮含量,对犁底层也有一定的影响;只施用化肥,虽然也能提高耕作层有机碳、全氮含量,但效果不显著。Based on seventeen year positioned experiment research, the results showed dry sieve aggregates （DSA） in plow layer and plow pan of a reddish paddy soil mainly consisted of DSA 〉5mm, and its proportion in treatments with organic materials application was lower than those without; for wet sieve aggregates （WSA）, WSA〉5mm accounted for the highest proportion in plow layer,and WSA〈0.25m did so in plow pan. The organic C and total N contents in WSAs concentrated in 〉lmm WSAs with the highest value appearing in WSA5-2mm of plow layer, and decreased with decreasing WSA size, with the highest value appearing in WSA〉5mm in plow layer. The ratio of C/N increased from WSA〉5mm to WSA2-1mm and decreased since WSA2-1mm in plow layer. However, it indicated a decreasing tread with decreasing WSA size in plow pan. Long-term organic materials returning, especially combined with inorganic fertilizers addition, can significantly improve organic C and total N contents in plow layers, and leave a few impacts on them in plow pan; if chemical fertilizers were applied alone, the effects on organic C and total N contents in plow layer were not obvious.

关 键 词：团聚体 分布 结构 碳 氮 红壤性水稻土 施肥 

分 类 号：S147.5[农业科学—肥料学] S158[农业科学—农业基础科学]