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首页> 外文期刊>Soil Biology & Biochemistry >Phosphate additions have no effect on microbial biomass and activity in a northern hardwood forest.
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Phosphate additions have no effect on microbial biomass and activity in a northern hardwood forest.

机译：添加磷酸盐对北部阔叶林中的微生物生物量和活性没有影响。

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High rates of atmospheric nitrogen (N) deposition have raised questions about shifting patterns of nutrient limitation in northern hardwood forests. Of particular interest is the idea that increased supply of N may induce phosphorus (P) limitation of plant and microbial processes, especially in acid soils where P sorption by Al is high. In this study, we established field plots and plant-free laboratory mesocosms with P and Ca additions to test the hypotheses that (1) microbial biomass and activity are limited by P in the northern hardwood forest soils at the Hubbard Brook Experimental Forest in NH USA; (2) elevated Ca increases inherent P availability and therefore reduces any effects of added P and (3) P effects are more marked in the more carbon (C) rich Oie compared to the Oa horizon. Treatments included P addition (50 kg P ha-1), Ca addition (850 kg Ca ha-1) and Ca+P addition (850 kg Ca ha-1 and 50 kg P ha-1). The P treatments increased resin-available P levels and reduced phosphatase activity, but had no effect on microbial biomass C, microbial respiration, C metabolizing enzymes, potential net N mineralization and nitrification in the Oie or Oa horizon of either field plots or plant free mesocosms, in either the presence or absence of Ca. Total, prokaryote, and eukaryote PLFA were reduced by P addition, possibly due to reductions in mycorrhizal fungal biomass. These results suggest that increased N deposition and acidification have not created P limitation of microbial biomass and activity in these soils.
机译：大气中氮的高沉积率引发了人们对北部阔叶林养分限制格局转变的质疑。特别令人感兴趣的是，氮的供应增加可能会引起植物和微生物过程中磷（P）的限制，特别是在铝对磷的吸附较高的酸性土壤中。在这项研究中，我们建立了田间地块和无植物实验室膜，并添加了磷和钙，以验证以下假设：（1）美国新罕布什尔州哈伯德布鲁克实验林中北部硬木森林土壤中的微生物生物量和活性受到磷的限制。 ; （2）升高的Ca会增加固有的P利用率，因此会减少添加的P的任何影响，并且（3）与Oa层相比，在富含碳（C）的Oie中P的影响更为明显。处理包括添加P（50 kg P ha -1 ），添加Ca（850 kg Ca ha -1 ）和添加Ca + P（850 kg Ca ha -1 和50 kg P ha -1 ）。磷处理增加了树脂的磷水平，降低了磷酸酶的活性，但对田间田地或无植物的中观世代的Oie或Oa地平线上的微生物量C，微生物呼吸，C代谢酶，潜在的净氮矿化和硝化作用没有影响。 ，无论是否存在Ca。总磷，原核生物和真核生物的PLFA通过添加磷而减少，这可能是由于菌根真菌生物量的减少。这些结果表明，增加的氮沉降和酸化作用并未在这些土壤中造成微生物生物量和活性的磷限制。

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