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首页> 外文期刊>Plant and Soil >Soil microbial community composition and structure: residual effects of contrasting N fertilization of swine lagoon effluent versus ammonium nitrate.
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Soil microbial community composition and structure: residual effects of contrasting N fertilization of swine lagoon effluent versus ammonium nitrate.

机译：土壤微生物群落组成和结构：猪粪池污水与硝酸铵氮肥对比施肥的残留效应。

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Land application of swine lagoon effluent (SLE) often changes soil pH and the concentrations of nutrients and trace metals. We hypothesize that fertilization-associated alteration in soil properties would have long-lasting effects on soil microbial community and the effects would depend on fertilization rates. In this study, microbial community composition and structure were characterized with phospholipid fatty acid (PLFA) profiles. Soils (0-7.5 cm depth) were sampled in March 2004 from the field plots planted with bermudagrass and tall fescue that received 0-600 kg plant available N (PAN) ha-1 year-1 of SLE or ammonium nitrate (AN) from 1999 to 2001. We observed that PLFA profiles differed significantly (P<0.05) between soils supplied with SLE versus AN, specifically at the highest application rate. PLFA profiles were strongly correlated with fertilization-associated changes in soil pH (Pearson's correlation coefficient r=0.80, P<0.01) and Mehlich III extractable Ca (r=0.78, P<0.01) and Mg (r=0.72, P<0.01). In soils receiving 200 and 400 kg PAN ha-1 year-1 of SLE or AN, microbial community was enriched slightly with fungi (P<0.01). In soils receiving 600 kg PAN ha-1 year-1 of SLE or AN, however, microbial community was stressed as evidenced by the reduction in microbial monounsaturated fatty acids and by the increase in the ratios of saturated-to-unsaturated fatty acids and of cyclopropyl fatty acids-to-their monoenoic precursors. These changes in PLFA biomarkers for stress were significantly (P<0.01) correlated with soil pH and Mehlich III extractable Ca and Mg, but not with soil properties such as total soil C, soluble soil organic C, soil inorganic N or Mehlich III extractable soil P. Our results indicated that soil microbial community was negatively affected when soils received SLE at an application rate of 600 kg PAN ha-1 year-1 in this forage production system..
机译：猪粪泻湖废水（SLE）在土地上的应用经常会改变土壤的pH值以及养分和微量金属的浓度。我们假设，与施肥相关的土壤性质变化对土壤微生物群落具有长期影响，其影响将取决于施肥速率。在这项研究中，微生物群落组成和结构用磷脂脂肪酸（PLFA）谱进行了表征。 2004年3月，从种植了百慕大草和高羊茅的田间地块中取样了土壤（深度为0-7.5厘米），该田间接受了0-600公斤植物可用N（PAN）ha-1 year-1 SLE或硝酸铵（AN） 1999年至2001年。我们观察到，SLE和AN所供应的土壤之间的PLFA分布差异显着（P <0.05），特别是在最高施用量下。 PLFA谱与施肥相关的土壤pH值变化（Pearson相关系数r = 0.80，P <0.01）和Mehlich III可萃取Ca（r = 0.78，P <0.01）和Mg（r = 0.72，P <0.01）密切相关。 。在接受200和400公斤PAN ha-1 year-1的SLE或AN的土壤中，微生物群落略有真菌富集（P <0.01）。然而，在接受600 kg PAN ha-1 year-1的SLE或AN的土壤中，微生物群落受到压力，微生物单不饱和脂肪酸减少，饱和与不饱和脂肪酸比例和环丙基脂肪酸制单烯酸酯前体。 PLFA胁迫生物标记的这些变化与土壤pH值和Mehlich III可提取的Ca和Mg显着相关（P <0.01），但与土壤性质（如总土壤C，可溶性土壤有机C，土壤无机N或Mehlich III可提取的土壤）不相关。 P.我们的结果表明，在此草料生产系统中，当土壤以600 kg PAN ha-1 year-1的施用量接受SLE时，土壤微生物群落受到负面影响。

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