Legume crop rotational effects are usually studied in only the first subsequent non‐legume crop even though several consecutive crops usually follow a legume. We studied the effects of field pea (Pisum sativum L.), faba bean (Vicia faba L.), faba bean green manure (faba GM), lentil (Lens culinaris Medik.), canola (Brassica napus L.), and wheat (Triticum aestivum L.), on soil microbial biomass carbon (MBC), β‐glucosidase enzyme activity, and bacterial physiological diversity in three subsequent crops at four locations. Generalized linear modeling (SAS PROC GLIMMIX) indicated that, when canola is grown 3 yr after an initial canola crop in the rotation, MBC is 4–40% (Bonferroni‐adjusted limits at 95% confidence) greater than when faba bean is the initial crop. Path modeling (SAS PROC CALIS) confirmed the negative effect on MBC by faba bean (relative to canola) as an initial crop. According to Bonferroni‐adjusted limits at 95% confidence, where faba GM was the initial crop, β‐glucosidase activity was 2–24% greater than where faba bean was the initial crop and 0.4–21.8% greater than where wheat was the initial crop. Similarly, where lentil was the initial crop, β‐glucosidase activity was 2–23% greater than where pea was the initial crop and 3–5% greater than where wheat was the initial crop. Path modeling revealed direct causal relationships from faba GM and lentil to β‐glucosidase activity. The legume crop effects on soil microbial properties were: faba GM > lentil > pea > faba bean, but we did not observe diminishing effects of the initial legumes to consecutive subsequent crops.

中文翻译：

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豆科作物与油菜的因果关系与土壤微生物特性

通常只在随后的第一个非豆类作物中研究豆类作物的轮作效应，尽管通常连续几个作物通常都跟随豆类。我们研究了豌豆（Pisum sativum L.），蚕豆（Vicia faba L.），蚕豆绿肥（faba GM），扁豆（Lens culinaris Medik。），低芥酸菜子（芸苔属L.）和小麦的影响（普通小麦L.），土壤微生物生物量碳（MBC），β-葡萄糖苷酶活性和四个地点随后的三个农作物的细菌生理多样性。广义线性模型（SAS PROC GLIMMIX）表明，当初次种植双低油菜籽后，双低油菜籽生长3年时，MBC比最初的蚕豆要高4–40％（Bonferroni调整限值为95％置信度）。庄稼。路径建模（SAS PROC CALIS）证实了蚕豆（相对于低芥酸菜籽）作为初始作物对MBC的负面影响。根据Bonferroni调整的置信度为95％的限制（在以蚕豆为原始作物的情况下），β-葡萄糖苷酶活性比在以蚕豆为原始作物的情况下高2–24％，比以小麦为原始作物的情况高0.4–21.8％。 。同样，小扁豆是最初的农作物，β-葡萄糖苷酶的活性比豌豆为原始作物高2–23％，比小麦为原始作物高3–5％。路径模型揭示了蚕豆转基因和扁豆与β-葡萄糖苷酶活性之间的直接因果关系。豆类作物对土壤微生物特性的影响是：蚕豆基因改造>小扁豆>豌豆>蚕豆，但我们没有观察到最初的豆类对随后的后续作物的影响减弱。