贡嘎山酸性土壤微生物量磷紧密关联碳酸氢钠提取态有机磷

发布时间：2018-06-21 02:23

本文选题：有效磷 + Hedley磷连续提取法　；参考：《山地学报》2017年05期

【摘要】：有效磷是土壤中最重要的磷组分,被广泛用于评估各种生态系统的土壤磷营养。然而,很少有研究基于野外数据评估有效磷的来源。本研究通过野外调查和室内试验,展示和评估了微生物量磷(MBP)和微生物群落对贡嘎山酸性土中有效磷组分的关联性。结果发现,微生物功能组脂肪酸显著解释有效磷变异性,尤其细菌脂肪酸强烈关联有效磷。与Hedley磷连续提取法中其他有效磷相比,仅碳酸氢钠提取态有机磷(NaHCO_3-Po)强烈关联MBP。本研究的数据分析、实验结果和以往的研究结果证明MBP与NaHCO_3-Po之间的这种关联性是直接的:微生物死亡裂解释放有效磷是导致这种联系的主要原因。这些结果揭示了微生物量磷测定方法与Hedley磷连续提取法测定方法的关联性:酸性土中MBP是Hedley磷连续提取法中NaHCO_3-Po的主要来源,也强调了Hedley磷连续提取法在评估微生物对土壤磷有效性作用中的重要参考性。
[Abstract]:Available phosphorus is the most important phosphorus component in soil, which is widely used to evaluate soil phosphorus nutrition in various ecosystems. However, few studies have evaluated the sources of available phosphorus based on field data. Through field investigation and laboratory experiments, the relationship between microbial biomass phosphorus (MBP) and microbial community on available phosphorus components in acidic soil of Gongga Mountain was demonstrated and evaluated. The results showed that fatty acids in microbial functional group significantly explained the variability of available phosphorus, especially bacterial fatty acids strongly associated with available phosphorus. Compared with other available phosphorus in Hedley phosphorus continuous extraction, only sodium bicarbonate extracted organophosphorus (NaHCO3-Poe) strongly associated with MBPs. The correlation between MBP and NaHCO3-Po is direct: the release of available phosphorus from microbial death cracking is the main reason for this connection. These results reveal the correlation between microbial biomass phosphorus determination method and Hedley phosphorus continuous extraction method: MBP in acid soil is the main source of NaHCO3-Po in Hedley phosphorus continuous extraction method. The important reference value of Hedley phosphorus continuous extraction method in evaluating the effect of microorganisms on soil phosphorus availability was also emphasized.
【作者单位】：中国科学院水利部成都山地灾害与环境研究所;中国科学院山地表生过程与生态调控重点实验室;中国科学院成都生物研究所;
【基金】：国家自然科学基金项目(41501281);国家自然科学基金重点项目(41630751) 中国科学院山地表生过程与生态调控重点实验室开放基金~~
【分类号】：S154.3

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