A meta-analysis of mycorrhizal responses to nitrogen, phosphorus, and atmospheric CO2 in field studies.
A meta-analysis of mycorrhizal responses to nitrogen, phosphorus, and atmospheric CO2 in field studies.
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DOI：
10.1111/j.1469-8137.2004.01159.x
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发表时间：
2004-11
期刊：
影响因子：
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通讯作者：
K. Treseder
中科院分区：
文献类型：
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作者：
K. Treseder
·许多实地研究已经测量了氮（N），磷（P）或大气CO2添加下的菌根动力学，以测试植物在土壤养分有限时应该投资于菌根真菌的假设。·在这里，荟萃分析被用来整合独立的实地研究中的营养反应。反应之间进行了比较外生和丛枝菌根真菌，肥料类型，测量方法，生物群，和首席调查员。反应程度和研究长度之间的关系，施肥率，养分总量，重复次数进行了测试。·在所有研究中，N施肥下菌根丰度降低15%，P施肥下降低32%。二氧化碳浓度升高导致了47%的增长。氮的影响在不同的研究中差异显着，P的影响在主要研究者之间差异显着。大多数其他因素没有影响菌根反应。这些结果支持植物投资假说，并表明全球菌根真菌的现存量可能在CO2升高下大幅增加，但在P增加下适度下降。氮沉降的影响可能是难以预测的个别生态系统，总体上略有负面影响。
• Numerous field studies have measured mycorrhizal dynamics under additions of nitrogen (N), phosphorus (P), or atmospheric CO2 to test the hypothesis that plants should invest in mycorrhizal fungi when soil nutrients are limiting. • Here meta-analyses were used to integrate nutrient responses across independent field-based studies. Responses were compared between ecto- and arbuscular mycorrhizal fungi, and among fertilizer types, methods of measurement, biomes, and lead investigators. Relationships between degree of response and study length, fertilization rates, total amounts of nutrients applied, and numbers of replicates were also tested. • Across studies, mycorrhizal abundance decreased 15% under N fertilization and 32% under P fertilization. Elevated CO2 elicited a 47% increase. Nitrogen effects varied significantly among studies, and P effects varied significantly among lead investigators. Most other factors did not affect mycorrhizal responses. • These results support the plant investment hypothesis, and suggest that global standing stocks of mycorrhizal fungi may increase substantially under elevated CO2 but decline moderately under P additions. Effects of N deposition may be difficult to predict for individual ecosystems, with a slightly negative influence overall.