目录
摘要Ⅱ关键词Ⅱ
AbstractⅢ
引言
引言1
1材料与方法2
1.1实验地点 2
1.2田地处理 2
1.3土壤原始理化性质测定2
1.4样品采集3
1.5样品制备3
1.6样品组称分测定3
1.7 数据统计分析5
2结果与分析5
2.1 不同盐度下填埋菊芋秸秆变化5
2.1.1菊芋秸秆纤维素变化分析5
2.1.2菊芋秸秆半纤维素含量分析5
2.1.3菊芋秸秆分解速率分析6
2.2填埋菊芋秸秆后土壤理化性质分析6
2.2.1填埋菊芋秸秆后土壤PH值变化分析6
2.2.2填埋菊芋秸秆后土壤含盐量变化分析7
2.2.3填埋菊芋秸秆后土壤含氮量变化分析9
2.2.4填埋菊芋秸秆后土壤有机质含量变化分析10
2.3不同盐度下填埋菊芋秸秆微生物多样性分析11
3讨论11
3.1不同盐浓度菊芋秸秆变化的影响11
3.2填埋菊芋秸秆对不同盐浓度土壤理化性质的影响12
3.3填埋菊芋秸秆对不同盐浓度土壤微生物的影响13
4结果13
致谢13
参考文献15
菊芋秸秆还田改良盐碱地过程及机制研究
摘 要
为了解植物耐盐机制和发展耐盐作物，研究秸秆还田改良盐碱土壤的改良机制，实验以耐盐植物菊芋的秸秆作为填埋材料，将其还田进行直接填埋处理，设置不同居于秸秆填埋重量，并填埋于不同含盐量的土壤。通过对填埋后土壤的理化性质、以及菊芋秸秆部分指标的变化、土壤微生物生物多样性进行测定，探讨秸秆还田改良盐碱土壤的机制。结果表明：低盐有利于秸秆纤维素分解，中盐和高盐抑制纤维素分解；中盐菊芋秸秆50g条件下半纤维素含量降幅最大，平均降低3.30g；高盐菊芋秸秆30g含量降幅最低，平均降低1.65g，中盐环境最适宜秸秆半纤维素分解，次之为低盐，最后为高盐；低盐环境下秸秆分解速率最快，中盐和高盐环境下秸秆分解速率较慢；气温对秸秆分 *51今日免费论文网|www.51jrft.com +Q: #351916072# 
解速率有很大的影响。秸秆填埋后对土壤PH值影响较小，雨水冲刷对菊芋秸秆填埋后的土壤PH影响较大；填埋秸秆后010cm土层低盐环境土壤含氮量增量达到2g∙kg1，而中盐土壤含氮量增量为1g∙kg1，高盐土壤含氮量增量为0.5g∙kg1，1020cm土层，低盐环境土壤含氮量增量达到6.5g∙kg1而中盐土壤含氮量增量为0.8g∙kg1，高盐土壤含氮量增量为0.6g∙kg1；010cm土层土壤中有机质最高增加1.15%，最低增加0.20%；1020cm土层中有机质含量最高增加1.13%，最低增加0.43%，但都降回初始值，持续时间短。低盐、中盐浓度土壤中微生物多样性上升，高盐土壤微生物多样性降低。
STUDY ON THE PROCESS AND MECHANISM OF JERUSALEM ARTICHOKE STRAW RETURNING TO IMPROVE SALINE ALKAIL SOIL
ABSTRACT
In order to understand the mechanism of salt tolerance of plants and develop salt tolerant crops, and to study the mechanism of straw returning to the field to improve saline alkali soil, the straw of Jerusalem artichoke, a salt tolerant plant, was used as landfill material, and it was returned to the field for direct landfill treatment, which was set up in different straw landfill weight and different salt content soil,. Through the determination of the physical and chemical properties of the soil after landfill, the changes of some indicators of Jerusalem artichoke straw and the microbial biodiversity of the soil, the mechanism of straw returning to the field to improve the saline alkali soil was discussed. The results showed that low salt was beneficial to the decomposition of straw cellulose, and medium salt and high salt inhibited the decomposition of cellulose; the content of hemicellulose decreased the most under 50g of medium salt Jerusalem artichoke straw, with an average of 3.30g; the content of 30g of high salt Jerusalem artichoke straw decreased the least, with an average of 1.65g; the medium salt environment was the most suitable for the decomposition of straw hemicellulose, followed by low salt and high salt; the straw decomposition under low salt environment The decomposition rate of straw is the fastest, and the decomposition rate of straw is slow in medium salt and high salt environment. After straw burying, it has little effect on the pH value of the soil, and the effect of rainwater scouring on the pH value of the soil after inulin straw burying is great; after straw burying, the increment of nitrogen content in low salt environment of 010cm soil layer is 2g∙kg1, while that in medium salt soil is 1g∙kg1, that in high salt soil is 0.5g∙kg1, and that in 1020cm soil layer, the increment of nitrogen content in low salt environment is 6.5g∙kg1, and that in medium salt environment is 6.5g∙kg1 The increment of soil nitrogen content is 0.8g∙kg1, the increment of high salt soil nitrogen content is 0.6g∙kg1; the highest increase of organic matter in 010cm soil layer is 1.15%, the lowest increase is 0.20%; the highest increase of organic matter content in 1020cm soil layer is 1.13%, the lowest increase is 0.43%, but they all drop back to the initial value, and the duration is short. The microbial diversity in low salt and medium salt concentration soil increased, while that in high salt soil decreased.

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