Newbery D M, Chuyong G B, Green J J, Songwe N C, Tchuenteu F, Zimmermann L
Institute of Plant Sciences, University of Bern, Altenbergrain 21, CH-3013 Bern Switzerland.
Institute of Agricultural Research for Development (IRAD), MINREST, Ekona Centre, PMB 25, Buea, SW Province, Cameroon.
New Phytol. 2002 Nov;156(2):297-311. doi: 10.1046/j.1469-8137.2002.00505.x.
• In a forest grove at Korup dominated by the ectomycorrhizal species Microberlinia bisulcata , an experiment tested whether phosphorus (P) was a limiting nutrient. • P-fertilization of seven subplots 1995-97 was compared with seven controls. It led to large increases in soil P concentrations. Trees were measured in 1995 and 2000. M. bisulcata and four other species were transplanted into the treatments, and a wild cohort of M. bisulcata seedlings was followed in both. Leaf litter fall from trees and seedlings were analysed for nutrients. • Growth of trees was not affected by added P. Transplanted seedlings survived better in the controls than added-P subplots: they did not grow better with added-P. M. bisulcata wildlings survived slightly better in the added-P subplots in yr 1 but not later. Litter fall and transplanted survivors had much higher concentrations of P (not N) in the added-P than control subplots. • Under current conditions, it appears that P does not limit growth of trees or hinder seedling establishment, especially of M. bisculcata , in these low-P grove soils.
• 在科鲁普国家公园一片以外生菌根物种双沟微白鬼笔为主导的森林小树林中，一项实验测试了磷（P）是否为限制养分。
• 1995年至1997年，对七个亚地块进行了施磷处理，并与七个对照地块进行比较。这导致土壤磷浓度大幅增加。在1995年和2000年对树木进行了测量。将双沟微白鬼笔和其他四个物种移植到这些处理地块中，并对双沟微白鬼笔野生幼苗群体在两种处理地块中的情况进行了跟踪。对树木和幼苗的落叶进行了养分分析。
• 树木的生长不受施磷的影响。移植的幼苗在对照地块中的存活率高于施磷亚地块：它们在施磷情况下生长并未更好。双沟微白鬼笔野生苗在第一年时在施磷亚地块中的存活率略高，但之后并非如此。与对照亚地块相比，施磷亚地块中落叶和移植存活者的磷（而非氮）浓度要高得多。
• 在当前条件下，在这些低磷小树林土壤中，磷似乎并不限制树木生长或阻碍幼苗定植，尤其是双沟微白鬼笔的幼苗定植。
