不同措施对连作土壤生物活性和蔬菜生物抗氧化性影响农业资源与环境植物营养学专业论文.docxVIP

CONTENTSCoNTENTS CONTENTS CoNTENTS Abstract in Chinese ．． ．． ． ．．I Abstract in English ． ． ．． ．． ． ． ．．．III 1．Introduction 1 1．1 Research continuous cropping soil of biological factors ．1 1．1．1 Microbial factors ． ． ．．． ．． ． ，，． ． ．．． ．．．． ，，，． ．．．． ．．1 1．1．2 Nematode population ．．2 1．1．3 Plant rhizosphere discharge ．2 1。2 Research continuous cropping soil of environmental factors ．．2 1．2．1 Soil pH ．．． ．． 2 1．2．2 Soil nutrient content 3 1．2．3 Soil enzyme ．3 1．3 Research continuous cropping soil ecosystem of improving measurements ．．4 1．2．1 Soil tillage management ． ． ，4 1．2．2 Soil amendment ．4 1．2．3 Microbial organic fertilizer ． ． ，． ． ．． ．5 1．4 Objective and significance 6 1．5 Sources of research ．．7 2．Materials and methods ． ． ．． ．8 2．1 Experimental design ．8 2．2 Test material and sampling methods ． ． ． ． ． ．．8 2．3 Indicators and measuring methods． ．．， ．．． ． ．． ，．． ．． ． ． ． ，9 2．4Data analysis ． ． ． ． ． ． ． ． 10 3．Result and alialysis 1 l 3．1 Effect ofdifferent measures continuous cropping soil encironmental factors 一1 I 3．1．1 Effect soil pH 1 1 3．1．2 Effect soil enzyme 一11 3．1．3 Correlatons analysis among soil pH and soil enzyme ．．14 3．2 Effect of different measures continuous cropping soil microbial factors 1 5 3．2．1 Effect soil bacterial quantity ．．1 5 3．2．2 Effect soil fungi quantity ．． ． ． ． ． ．1 5 3．2．3 Effect soil actionmycetes quantity ． ． ． ． ． 1 5 3．3 Effect ofdifferent measures garlic morphological parameter ． ． ． ． ．16 3．3．1 Effect plant height ofgarlic ． ．．16 3．3．2 Effect stem diameter ofgarlic ． ．． 。． ． 。 。。。 ．．17 3．3．3 Effect the yield of garlic ． ．． ． ． ． ．．1 7 3．4 Effect of different measures garlic autioxidant enzyme activities 1 9 3．4．1 Effe