Liu Chang, Tang Guo-Yong, Tong Cheng-Li, Xia Hai-Ao, Jiang Ping, Lin Yun-Hua
Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China.
Ying Yong Sheng Tai Xue Bao. 2008 Jul;19(7):1489-93.
Soil samples were collected from long-term monitoring plots of paddy field ecosystem in Hunan Province to study the evolvement characteristics and coupling relationship of soil organic carbon and total nitrogen under different fertilization practices. The results showed that in 1986-2003, the contents of soil organic carbon and total nitrogen had a slight decrease under no fertilization (CK), basically remained stable under chemical fertilization (NPK), and increased under the combined application of organic manure and chemical fertilizers. Compared with those in CK, the contents of soil organic carbon and total nitrogen in treatments NPK, low application rate organic manure, and high application rate organic manure were increased by 13% and 18%, 54% and 45%, and 89% and 67% respectively. There was a significant positive correlation (P < 0.01) between soil organic carbon and total nitrogen. The soil C/N was around 10, with the majority ranged from 8.5 to 12.9. It was suggested that a combined application of organic manure and chemical fertilizers on paddy field could increase the sequestration and accumulation of soil carbon and nitrogen to a certain extent, and there existed a better coupling relationship between soil organic carbon and total nitrogen in paddy field ecosystem.
采集湖南省稻田生态系统长期监测样地的土壤样本，以研究不同施肥方式下土壤有机碳和全氮的演变特征及耦合关系。结果表明，1986—2003年，不施肥（CK）处理下土壤有机碳和全氮含量略有下降，化肥（NPK）处理下基本保持稳定，有机肥与化肥配施处理下含量增加。与CK相比，NPK、低量有机肥和高量有机肥处理的土壤有机碳和全氮含量分别增加了13%和18%、54%和45%、89%和67%。土壤有机碳和全氮之间存在极显著正相关（P<0.01）。土壤C/N约为10，大部分范围在8.5至12.9之间。研究表明，稻田有机肥与化肥配施可在一定程度上增加土壤碳氮固存和积累，稻田生态系统中土壤有机碳和全氮之间存在较好的耦合关系。
