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Responses of soil microbial biomass and enzymatic activities to different forms of organic nitrogen deposition in the subtropical forests in East China

机译：华东亚热带森林土壤微生物量和酶活性对不同形式有机氮沉积的响应

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摘要

Numerous studies reported that inorganic nitrogen (N) deposition strongly affected forest ecosystems. However, organic N is also an important component of atmospheric N deposition. The influence of organic N deposition on soil microbial biomass and extracellular enzymatic activities (EEA) in subtropical forests remains unclear. Coniferous forest (CF) and broad-leaved forest (BF) were chosen from the Zijin Mountain in China. Five forms of organic N (urea, glycine, serine, nonylamine, and a mixture of all four) were used to fertilize the soils in CF and BF every month for 1 year. Soil samples were collected every 2 months. Subsequently, soil microbial biomass and EEA were assayed. Results showed that the microbial biomass and EEA of soils fertilized with urea and amino acids increased significantly, whereas those fertilized with nonylamine and mixed N decreased significantly. Urea and amino acid fertilizations had a more positive influence on EEA of BF than on those of CF. Nonylamine fertilization had a more negative influence on EEA of CF than on those of BF. Organic N fertilization shifted soil microbial biomass away from the excretion of N-degrading enzymes and toward the excretion of C-degrading enzymes. These results suggest that organic N type is an important factor that affects soil microbial biomass, EEA, and their relationship. Organic N deposition may seriously affect soil C and N cycling, as well as carbon dioxide releasing from the soils by influencing microbial activities and biomass. This study thereby provides evidence that soil microorganisms have strong feedback to different forms of organic N deposition.
机译：大量研究报告表明，无机氮（N）的沉积会严重影响森林生态系统。但是，有机氮也是大气氮沉积的重要组成部分。亚热带森林中有机氮沉积对土壤微生物生物量和细胞外酶活性（EEA）的影响尚不清楚。针叶林（CF）和阔叶林（BF）选自中国紫金山。每年使用五种形式的有机氮（尿素，甘氨酸，丝氨酸，壬基胺，以及所有四种的混合物）在CF和BF中施肥。每2个月收集一次土壤样品。随后，测定土壤微生物量和EEA。结果表明，尿素和氨基酸施肥的土壤微生物量和EEA显着增加，而壬基胺和混合氮施肥的土壤微生物量和EEA显着下降。尿素和氨基酸的施肥对高炉的EEA的影响大于对CF的影响。壬基胺的施肥对CF的EEA的影响比对BF的影响更大。有机氮肥的施肥使土壤微生物量从氮降解酶的排泄转移到了碳降解酶的排泄。这些结果表明有机氮类型是影响土壤微生物生物量，EEA及其关系的重要因素。有机氮的沉积可能会严重影响土壤的碳和氮循环，以及通过影响微生物活动和生物量而从土壤中释放二氧化碳。因此，这项研究提供了证据，表明土壤微生物对不同形式的有机氮沉积具有强大的反馈作用。

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  • 来源
    《Ecological research》 |2013年第3期|447-457|共11页
  • 作者

    Yanna Lue; Congyan Wang; Yanyan Jia; Jingjing Du; Xu Ma; Wenwen Wang; Gaozhong Pu; Xingjun Tian;

  • 作者单位

    School of Life Sciences, Nanjing University, Hankou Road 22,Nanjing 210093, People's Republic of China;

    School of Environmental Sciences, Jiangsu University, Zhenjiang 212013, People's Republic of China;

    School of Life Sciences, Nanjing University, Hankou Road 22,Nanjing 210093, People's Republic of China;

    School of Life Sciences, Nanjing University, Hankou Road 22,Nanjing 210093, People's Republic of China;

    School of Life Sciences, Nanjing University, Hankou Road 22,Nanjing 210093, People's Republic of China;

    School of Life Sciences, Nanjing University, Hankou Road 22,Nanjing 210093, People's Republic of China;

    School of Life Sciences, Nanjing University, Hankou Road 22,Nanjing 210093, People's Republic of China;

    School of Life Sciences, Nanjing University, Hankou Road 22,Nanjing 210093, People's Republic of China;

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  • 关键词

    Coniferous forest; Broad-leaved forest; Organic nitrogen deposition; Extracellular enzymatic activities; Soil microbial biomass;

    机译：针叶林;阔叶林;有机氮沉积;细胞外酶活性;土壤微生物量;

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