天然草地土壤化学性质对氮磷添加响应的Meta分析

Meta analysis of the response of natural grasslandsoil chemical properties to nitrogen andphosphorus addition

摘要:

搜集2000~2020年国内外有关氮磷添加对天然草地土壤化学性质影响的73篇文献资料的1 960组数据,采用整合分析(Meta-analysis)方法分析了天然草地土壤化学性质对氮磷添加的响应,以及氮添加、磷添加和氮磷添加下天然草地土壤化学性质效应值与环境因子之间的相关关系。结果表明:在氮、磷和氮磷同时添加的条件下,土壤含水量和pH均显著降低,土壤全氮和速效磷均显著增加,而氮磷同时添加的条件下土壤全氮和速效磷的增加幅度要大于单独添加氮和磷的情况。在添加氮的条件下,土壤全氮、铵态氮、硝态氮和微生物生物量碳均显著增加,土壤有机碳、全磷和可溶性有机碳均显著减少。土壤pH的效应值与土壤有机碳、铵态氮、速效磷和可溶性有机氮的效应值表现显著的负相关关系(P＜0.05),土壤铵态氮的效应值和可溶性有机碳的效应值表现显著的负相关关系(P＜0.05)。在添加磷的条件下,土壤全磷、可溶性有机氮和微生物生物量碳均显著增加,土壤硝态氮显著减少。土壤速效磷的效应值与土壤pH、有机碳和全磷的效应值表现显著的正相关关系(P＜0.05)。在同时添加氮和磷的条件下,土壤全磷和可溶性有机碳均显著增加,土壤有机碳和微生物生物量碳均显著减少。土壤可溶性有机碳的效应值与全磷和硝态氮的效应值表现显著的正相关关系,与铵态氮的效应值表现显著的负相关关系(P＜0.05)。在氮、磷单独添加和氮磷同时添加的条件下,年平均温度均会显著影响土壤微生物生物量碳。在氮和磷单独添加的情况下,年平均温度和年均降水量均会显著影响土壤可溶性有机氮。

Abstract:

Collected 1960 sets of data from 73 literatures on the effects of nitrogen and phosphorus addition on natural grassland soil chemistry from 2000 to 2020,and analyzed the response of natural grassland soil chemical properties to nitrogen and phosphorus additions using the method of meta-analysis,and analyzed the correlation between the effect values of natural grassland soil chemical properties and environmental factors under nitrogen addition,phosphorus addition,nitrogen and phosphorus simultaneous addition.The results showed that under the conditions of simultaneous addition of nitrogen,phosphorus,and adding nitrogen or phosphorus alone,the soil water content and pH were significantly reduced,and the total soil nitrogen and available phosphorus were significantly increased,while the increase of soil total nitrogen and available phosphorus under the conditions of simultaneous addition of nitrogen and phosphorus was greater than the case of adding nitrogen or phosphorus alone.Under the condition of adding nitrogen,soil total nitrogen,ammonium nitrogen,nitrate nitrogen,and microbial biomass carbon all increased significantly,while soil organic carbon,total phosphorus,and soluble organic carbon all decreased significantly.The effect value of soil pH showed a significant negative correlation with the effect value of soil organic carbon,ammonium nitrogen,available phosphorus and soluble organic nitrogen (P＜0.05),and the effect value of soil ammonium nitrogen and soluble organic carbon showed a significant negative correlation (P＜0.05).Under the condition of adding phosphorus,soil total phosphorus,soluble organic nitrogen,and microbial biomass carbon all increased significantly,and soil nitrate nitrogen decreased significantly.The effect value of soil available phosphorus was significantly positively correlated with the effect value of soil pH,soil organic carbon,and total phosphorus (P＜0.05).Under the conditions of simultaneous addition of nitrogen and phosphorus,soil total phosphorus and soluble organic carbon both increased significantly,and soil organic carbon and microbial biomass carbon decreased significantly.The effect value of soil soluble organic carbon was significantly positively correlated with the effect value of total phosphorus and nitrate nitrogen,while negatively correlated with the effect value of ammonium nitrogen (P＜0.05).The correlation between the effect values of grassland soil chemical properties and climate factors found that under the conditions of simultaneous addition of nitrogen,phosphorus,and adding nitrogen or phosphorus alone,the annual average temperature would significantly affect the soil microbial biomass carbon.When nitrogen and phosphorus were added separately,both the annual average temperature and the annual average precipitation would significantly affect the soil soluble organic nitrogen.