The response characteristics of soil microbial biomass carbon and nitrogen contents to organic fertilizer by Meta-analysis
Soil microbial biomass carbon and nitrogen contents were important indexes for evaluating soil fertility.Therefore,the response characteristics of soil microbial biomass carbon and nitrogen contents to organic fertilizer could provide guidance for the scientific organic fertilizer application.A total of 84 high-quality literatures were retrieved from the database,and 625 sets of valid field experiment data were extracted.The changes of soil microbial biomass carbon and nitrogen contents,crop yield under organic fertilizer application and their influencing factors were analyzed by Meta-analysis.The results showed that organic fertilizer significantly promoted soil microbial biomass carbon and nitrogen contents,crop yield(P＜0.05),increasing by 41.14%[95%confidence interval(CI):38.32%-44.04%],46.46%(95%CI:43.02%-50.01%)and 48.85%(95%CI:43.86%-45.03%),respectively.Organic fertilizer increased microbial biomass carbon content by 46.80%(95%CI:43.22%-50.46%),microbial biomass nitrogen content by 56.0%(95%CI:47.18%-65.37%),and crop yield by 47.48%(95%CI:39.98%-55.36%),compared with no fertilization.Organic fertilizer combined with fertilizer increased microbial biomass carbon content by 36.06%(95%CI:21.22%-52.71%),microbial biomass nitrogen content by 40.80%(95%CI:30.42%-52.01%),and crop yield by 4.04%(95%CI:2.26%-5.46%),compared with single chemical fertilizer.The results of Meta-analysis showed that soil microbial biomass carbon and nitrogen contents,crop yield were also affected by crop type,nitrogen application amount,organic fertilizer application mode,soil initial pH,soil type and climate conditions.Further correlation analysis showed that microbial biomass carbon content was positively correlated with initial soil pH and average annual temperature(P＜0.05),soil microbial biomass nitrogen content was significantly positively correlated with soil initial pH and nitrogen application amount(P＜0.05),soil microbial biomass carbon and nitrogen ratio was significantly positively correlated with average annual temperature(P＜0.05)and crop yield was positively correlated with soil microbial biomass carbon and nitrogen contents,soil initial pH(P＜0.05).In general,organic fertilizer could significantly promote soil microbial biomass carbon and nitrogen contents,crop yield.It is recommended to construct the fertilization technique of single or combined application of organic fertilizer in combination with factors such as crop type,soil condition and climate type,so as to realize the effective utilization of fertilizer resources,the improvement of soil productivity and the construction of soil health microecology.
NETL
NSTL
万方数据
