不同用地土壤有机质和微生物对添加秸秆的响应
发布时间：2018-08-24 12:21
【摘要】：选取采集于国内17个省(区)的不同利用方式下的85个土样为研究对象,定量添加玉米(Zea mays)秸秆置于相同温度培养90d,分析土壤有机质(soil organic matter,SOM)含量变化特征及其驱动因子。结果表明,添加玉米秸秆后,不同用地的SOM变化存在较大差异,63.5%的土壤样品的SOM增加,36.5%的减少;SOM含量相对变化率与其初始SOM含量呈显著负相关关系(P0.05),说明在短期内添加秸秆并不一定意味着土壤有机质会提高。试验土样来源于4种不同用地方式中,采集于播种粮食旱地的88%的土样,其SOM含量增加;采集于水稻田的土样,其SOM含量均减少;采集于林地和菜地的土样,其SOM含量有增有减。添加秸秆后,各土样的可培养微生物数量均增加,增加量表现为水稻田林地菜地粮食旱耕地,真菌放线菌细菌。磷脂脂肪酸(phospholipid fatty acid,PLFA)分析显示细菌/真菌与G+/G-均表现为水稻田粮食旱耕地林地菜地,比值越小说明土壤生态系统越稳定;A/B和iso/anteiso、C/A均表现为菜地粮食旱耕地林地水稻田,比值越小代表养分和环境胁迫越严重。因此,4种用地方式中,水稻田土壤生态系统稳定性较差,受养分和环境胁迫程度高。
[Abstract]:Eighty-five soil samples collected from 17 provinces (regions) in China were selected as the research objects. The content of soil organic matter (soil organic matter,SOM) and its driving factors were analyzed by adding corn (Zea mays) straw at the same temperature for 90 days. The results showed that, after adding corn straw, There was a significant difference in SOM change between different land use and 63.5% soil samples. The decrease of SOM content in soil samples by 36.5% had a significant negative correlation with the initial SOM content (P0.05), indicating that adding straw in the short term does not necessarily mean soil. Soil organic matter will increase. The experimental soil samples come from four different land use methods, 88% of the soil samples collected in the dry land for sowing grain, the SOM content increased, the SOM content of the soil samples collected in the paddy fields decreased, and the soil samples collected in the woodland and vegetable fields. The content of SOM increased and decreased. After adding straw, the number of culturable microbes in each soil sample increased, and the increase was manifested as follows: dry land of rice field, fungi and actinomycetes. The analysis of phospholipid fatty acid (phospholipid fatty acid,PLFA) showed that bacteria / fungi and G / G- were rice fields, and the lower the ratio was, the more stable the soil ecosystem was, and the more stable the soil ecosystem was, the more stable the soil ecosystem was. The smaller the ratio, the more serious the nutrient and environmental stress. Therefore, the stability of soil ecosystem in paddy field is poor, and the degree of nutrient and environmental stress is high.
【作者单位】： 西南大学资源环境学院;
【基金】：国家级“三峡库区水环境监测与模拟国际科技合作基地” 中央高校基本科研业务费(XDJK2016D042)
【分类号】：S141.4
[Abstract]:Eighty-five soil samples collected from 17 provinces (regions) in China were selected as the research objects. The content of soil organic matter (soil organic matter,SOM) and its driving factors were analyzed by adding corn (Zea mays) straw at the same temperature for 90 days. The results showed that, after adding corn straw, There was a significant difference in SOM change between different land use and 63.5% soil samples. The decrease of SOM content in soil samples by 36.5% had a significant negative correlation with the initial SOM content (P0.05), indicating that adding straw in the short term does not necessarily mean soil. Soil organic matter will increase. The experimental soil samples come from four different land use methods, 88% of the soil samples collected in the dry land for sowing grain, the SOM content increased, the SOM content of the soil samples collected in the paddy fields decreased, and the soil samples collected in the woodland and vegetable fields. The content of SOM increased and decreased. After adding straw, the number of culturable microbes in each soil sample increased, and the increase was manifested as follows: dry land of rice field, fungi and actinomycetes. The analysis of phospholipid fatty acid (phospholipid fatty acid,PLFA) showed that bacteria / fungi and G / G- were rice fields, and the lower the ratio was, the more stable the soil ecosystem was, and the more stable the soil ecosystem was, the more stable the soil ecosystem was. The smaller the ratio, the more serious the nutrient and environmental stress. Therefore, the stability of soil ecosystem in paddy field is poor, and the degree of nutrient and environmental stress is high.
【作者单位】： 西南大学资源环境学院;
【基金】：国家级“三峡库区水环境监测与模拟国际科技合作基地” 中央高校基本科研业务费(XDJK2016D042)
【分类号】：S141.4
【参考文献】
相关期刊论文 前10条
1 李艳;窦森;刘艳丽;王帅;李立波;;微生物对暗棕壤添加玉米秸秆腐殖化进程的影响[J];农业环境科学学报;2016年05期
2 丁红利;吴先勤;张磊;;秸秆覆盖下土壤养分与微生物群落关系研究[J];水土保持学报;2016年02期
3 魏倩倩;杨文权;韩明玉;慕小倩;寇建村;;白三叶返园对苹果园土壤微生物群落的影响[J];草业科学;2016年03期
4 杨封科;何宝林;张立功;高应平;;膜下秸秆还田双垄种植对土壤养分平衡及玉米产量的影响[J];草业科学;2015年11期
5 于寒;谷岩;梁p芎，
本文编号：2200804
本文链接：https://www.wllwen.com/kejilunwen/nykj/2200804.html
