Characteristics of C and N Accumulation in Infertile Red Soil Under Different Rotation Systems

作     者：LI Zhong-pei, TANG Yong-liang, SHI Hua and ZHANG Tao-lin(Institute of Soil Science , Chinese Academy of Sciences , Nanjing 210008 , P. R . China ) 

作者机构：Institute of Soil Science Chinese Academy of Sciences Nanjing 210008 P.R.China 

出 版 物：《Agricultural Sciences in China》 (中国农业科学（英文版）)

年 卷 期：2002年第1卷第10期

页      面：1125-1132页

学科分类：09[农学] 0903[农学-农业资源与环境] 090301[农学-土壤学] 

基　　金：the National Key Basic Research Support Foundation of China(G1999011801) the National Natural Science Foundation of China(39899370) 

主　　题：Different rotation systems Infertile red soil C and N accumulation 

摘      要：A long-term experiment was conducted at the Ecological Experimental Station of Red Soil, Chinese Academy of Sciences to investigate the characteristics of material cycling and C, N accumulation in infertile red soil under different treatments of rotation systems for 11 years. Plant biomass, amount of organic materials returned to the soil, and budget of nitrogen in soil were obviously different under conventional cultivation, coverage by shrubs (Lespedeza formosa), rotation of shrubs (Lespedeza formosa) and crops (Peanut-Buckwheat) . Rotation of shrubs and crops with a combination of rational fertilization would be 75 - 100% of biomass and a similar amount of organic materials returned to the soil compared with that under coverage shrubs, more input than output of nitrogen, high system stability, and increasing crop productivity. With distinct cycling, different treatments of rotation systems influenced discriminatorily soil fertility. Soil organic carbon and nitrogen were respectively less than 7 and 0.6 g kg-1 for conventional cultivation, 9-11 and 0.6-0.9 g kg-1 for rotation of shrubs and crops, 14 - 16 g kg-1 and more than 1 g kg-1 for coverage by shrubs after 11 years, which represent low, middle and high levels of upland red soil fertility at the current situation. It implied that with cultivation system and fertilization measures, the infertile red soil could have middle to high fertility after about 10 years rational utilization. Comparison of results from different treatments showed that a large loss of organic carbon and nitrogen was caused by soil erosion which resulted in a low level of C and N in upland red soil. It could be suggested that increasing carbon storage in infertile red soil would sequester a great amount of atmospheric CO2 and mitigate the global warming potentially.