室内培养条件下南北方稻田土壤氮素矿化特征的研究-农业资源与环六境；植物营养学专业毕业论文.docxVIP

CONTENTS CONTENTS Abstract in Chinese．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．． ．．．．．．．．．．．．．．．．．．．．．．．．． ．．． ．．． ．．．．．． ．．I Abstract in English ．． ． ． ．III 1．Introduction l 1．1 The objective and significance ofthe study． ． ．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．1 1．2 The research situation and trends． ． ． ． ． ．2 1．2．1 N efficiency of paddy field ． ． 2 1．2．2 Soil supply N characteristics of paddy field ． ． ．．2 1．2．3 Determination of organic N mineralization ．．3 1．2．4 The factors of influncing soil N mineralization ． ． 6 1．2．5 The fate of soil mineralization N 一9 2。Materials and methods．。．． ．．．．．．．．． ．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．，。 ．． ．．．．．．．．．．．．．．．．．． ．．．．．．． ．．．．．．．．．．．1() 2．1 Materials．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．． ．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．． ．．．．．．．．．．．．．．1() 2．2 M{；thods ． ． l() 2．2．1 Experiment design ．1 0 2．2．2 Sample collection and testing 一1 l 2．2．3 Data progressing and analysis 一1 2 3．Results and auaiysis ． ． ．．1zl 3．1 Effect ofpre-incubation temperature on soil organic N mineralization ．14 3．1．1 Ammonium N content after pre·incubation 14 3．1．2 Mineralization N content ofsoil ．15 3．1．3 Soil ammonium N content at the end ofincubation 16 3．1．4 Model fitting of soil mineralization characteristics l 7 3．1．5 Effect of pre-incubation temperature on soil organic N components ．1 7 3．2 Relationship between the reduced mineralization N in later incubation period and fixed ammonium ． ． ． ． ． ． ． ． ． ． 1 8 3．2．1 Mineralization N content ofsoil after long incubation ．19 3．2．2 Fixed ammonium content during the mineralization process ．20 3．2．3 T0tal soil mineralization N content 2l 3．2．4 Soil organic N components during the mineralization process ．22 3．2．5 Relationship between organic N components and mineralization N content ．．23 3．3 Relationship between soil microbes component and N mineralization 一24 3．3．1 C02production rate 一24