整合分析氮添加对土壤有机磷转化的影响

Integrated analysis of the effect of nitrogen addition on soil organic phosphorus transformation

为了探究氮沉降对土壤有机磷矿化和微生物磷固持的影响规律,收集了全球范围内86篇有关土壤有机磷转化影响的文献,对获取的874组数据进行meta分析,定量分析氮添加对土壤有机磷转化相关指标(磷酸酶、微生物量磷等)的影响及其在不同类型生态系统、土壤pH、土壤深度、氮源、氮添加量和持续时间的差异。在全球范围内,氮添加使土壤酸性磷酸酶和碱性磷酸酶活性分别显著升高了10.7%、8.8%,微生物量磷含量显著降低了13.2%。氮添加促进土壤有机磷矿化增强,抑制了微生物对磷的固持。氮添加使土壤pH降低了4.1%,土壤pH与酸性磷酸酶活性呈显著负相关,而与微生物量磷含量呈显著正相关。氮添加提高了土壤磷酸酶活性,表明氮添加促进了土壤有机磷矿化。氮添加使土壤微生物量磷含量显著降低,抑制了土壤微生物对磷的固持。有机磷矿化和微生物固持在不同生态系统类型、土壤pH、土壤深度、试验操作中对氮添加的响应存在差异。此外,氮添加引起的土壤pH变化是其影响土壤有机磷转化的重要原因。

In order to investigate the impact of nitrogen deposition on soil organic phosphorus mineralization and microbial phosphorus fixation,this study collected 86 pieces of literature on the impact of soil organic phosphorus transformation worldwide and conducted a meta-analysis of 874 sets of data obtained.Quantitative analysis was conducted on the effects of nitrogen addition on soil organic phosphorus transformation related indicators(phosphatase,microbial biomass phosphorus,etc.)and their differences in different types of ecosystems,soil pH,soil depth,nitrogen source,nitrogen addition amount,and duration.Globally,nitrogen addition significantly increased soil acid phosphatase and alkaline phosphatase activities by 10.7%and 8.8%,respectively,and significantly decreased soil microbial biomass phosphorus content by 13.2%.The addition of nitrogen promoted the enhancement of soil organic phosphorus mineralization and inhibited the fixation of phosphorus by microbial biomass.Nitrogen addition reduced soil pH by 4.1%.Soil pH was significantly negatively correlated with acid phosphatase activity,but significantly positively correlated with microbial biomass phosphorus content.Nitrogen addition significantly increased soil phosphatase activity,indicating that nitrogen addition promoted soil organic phosphorus mineralization.The addition of nitrogen significantly reduced the phosphorus content of soil microbial biomass and inhibited the fixation of phosphorus by soil microorganisms.The response of organic phosphorus mineralization and microbial fixation to nitrogen addition varied among different ecosystem types,soil pH,soil depth,and experimental operations.In addition,the change in soil pH caused by nitrogen addition was an important reason for its impact on soil organic phosphorus transformation.