黄淮地区麦玉周年土壤肥力与玉米产量的相关和通径分析
测定麦玉周年成熟期土壤养分、微生物量碳氮、酶活性和玉米产量等指标。运用相关分析和通径分析方法,研究麦玉两熟制农田土壤因子与玉米产量的关系。结果表明,土壤有机质、全氮、全磷、速效钾、速效磷、土壤微生物量碳氮、脲酶活性均与玉米产量有极显著或显著相关关系。土壤有机质对玉米产量的直接作用最大(直接通径系数P1y= 0.422),其次是微生物量氮(P6y= 0.381)和全氮(P2y= 0.254),三者的通径系数均为正值,表明对提高玉米产量起到促进作用。从决策系数绝对值大小可以得出,土壤有机质、全氮和微生物量氮对玉米产量的综合排序为：土壤有机质＞微生物量氮＞全氮,土壤有机质的决策系数最大且为正值,说明土壤有机质是影响麦玉两熟制农田玉米产量的主要决策指标。
英文摘要:
Correlation and path coefficient analysis were studied for maize (Zea Mays L.). Soil fertility and yield of maize were investigated. Results showed that there was significant linear relationship between soil organic matter, total nitrogen, total phosphorus, availablephosphorus, available phosphorus, microbial biomass nitrogen, microbial biomass carbon, urease and yield of maize. The direct and indirect effects on yield of maize were estimated. The highest positive direct effect belonged to soil organic matter (P1y= 0.422), the second positive direct effect belonged to soil microbial biomass nitrogen(P6y= 0.381), the smallest positive direct effect belonged to total nitrogen(P2y= 0.254). By using the index of path analysis decision coefficient, sequence of the synthetic action of every independent variable to response variable could be decided. Soil organic matter was the principal decision variable.
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