| With the development of global warming and the development of modern agriculture,the sustainable use of soil resources has become a hot research topic in the field of agricultural science.In this paper,based on Continuous Fertilization 33 years of subtropical red soil paddy soil fertilization experiment by 4 kinds of Different Fertilization Ways:1)no fertilizer(CK),2)application of chemical fertilizer(NPK),3)chemical fertilizer plus manure(NPKM),4)fertilizer+straw(NPKS),the physical and chemical properties of different depth of soil and organic carbon of accumulation of regularity of the stability of organic carbon in paddy soil in deep.The main conclusions of this paper are as follows:(1)The effect of long-term fertilization on soil fertility in red soil is significant.Combined application of straw and chemical fertilizer in low,but will also be compared with no fertilizer treatment,long-term fertilization treatments of different soil clay content were increased,the inorganic fertilizer and organic fertilizer application increased significantly;and no fertilizer treatment compared to single application of fertilizer will make the soil pH value decreased,inorganic fertilizer and organic manure fertilizer to soil pH value degree compared with single chemical fertilizer treatment in deep soil can increase soil pH value;and no fertilizer treatment,fertilization can increase the different depth of soil organic matter,total nitrogen,total phosphorus,total potassium and alkali hydrolysis nitrogen,available phosphorus,available potassium content,including organic and inorganic fertilizer increased effect is remarkable.Therefore,the long-term use of organic fertilizer and inorganic fertilizer combined application mode can improve the level of fertilizer in the soil,which is conducive to the sustainable use of soil.(2)Long term fertilization could significantly increase the labile organic carbon(LOC)content in the soil,and the soil LOC decreased with the increase of soil depth,the content of LOC was significantly correlated with the soil organic matter.(3)Long term fertilization could significantly decrease the Ca-SOC content in the soil,and the Ca-SOC content in the soil decreased with the increase of the sampling depth,and the Ca-SOC content in the soil was less than that in the 40cm depth.Long term fertilization could significantly increase the content of Fe(Al)-SOC in soil.(4)The content of Ca-SOC and Fe(Al)-SOC in soil was significantly correlated with the content of organic matter in the soil,regardless of whether or not fertilization,the organic matter content could significantly affect the Ca-SOC content and Fe(Al)-SOC content. |
