Effect On The Amounts And Quality Of Soil Organic Matter With Different Sod Materials

With the way of the sandy sieve tube method, combing with the experiment of interplanting sod in the field, the effects on the amounts and quality of orchard soil organic matter (SOM) with 5 types of sod materials, which were Paspalum notatum Flugge, Pspalum WettsteiniiHacke, Indigofera Endecaphylla, Mimosa invisa Mart and Hedyotissp, were studied. Furthermore, the contribution rate to the amounts and quality of SOM with the materials and its varying law were summarized. The main conclusion was proposed as follows:(1) After 16-years-decomposition, Paspalum notatum Flugge and Pspalum WettsteiniiHacke had the most advantage of accumulating for soil humus among the aboveground materials, whereas Pspalum WettsteiniiHacke was the best in underground. Among the materials whatever aboveground or underground, Hedyotissp was the best grass to improve the activity of humus.(2) Comparing with 1-year-decomposition, we found out that the amount of soil organic carbon decreased significantly in the 16-year-decomposion materials, soil complex organic carbon varied insignificantly, soil loose-combined humus decreased and soil tight-combined humus increased significantly while soil stable-combined humus changed insignificantly. Moreover, the amount of HA and FA in soil loose-combined humus decreased significantly while the rate of HA/FA didn't change obviously in the 16-year-decomposion materials.(3) The fertilizing effect of 5 types of materials were evaluated with analytical hierarchy process (AHP). The result showed that among those materials aboveground, Paspalum notatum Flugge had the most contribution to the amount and quality of SOM, followed by Pspalum WettsteiniiHacke, Hedyotissp, Indigofera Endecaphylla and Mimosa invisa Mart, i.e., gramineae plants having the most contribution, followed by Rubiaceae plants and legume plants. Meanwhile, Pspalum WettsteiniiHacke was the most among those underground, followed by Hedyotissp, Paspalum notatum Flugg, Indigofera Endecaphylla and Mimosa invisa Mart, i.e., legume plants having the least contribution, followed by gramineae plants and Rubiaceae plants . (4) The results of interplanting sod in the orchard showed that the amounts of soil organic carbon, soil complex organic carbon, loose-combined and tight-combined humus, soil active organic carbon increased significantly, the rate of humus loose to humus tight also increased significantly. The fertilizing effect of 5 types of materials were evaluated with AHP showed that Pspalum WettsteiniiHacke had the most contribution to the amounts and quality of SOM, followed by Paspalum notatum Flugge, Hedyotissp, Mimosa invisa Mart and Indigofera Endecaphylla, i.e., gramineae plants being the most, followed by Rubiaceae plants and legume plants, which coincides with the result of sod materials aboveground with the way of decomposition experiment.