caa a22 4500 477112234 CHVBK 20180405111612.0 cr unu---uuuuu 170330e19960501xx s 000 0 eng 10.1007/BF00029049 doi (NATIONALLICENCE)springer-10.1007/BF00029049 Williams B. Macaulay Land Use Research Institute, Craigiebuckler, AB15 8QH, Aberdeen, Scotland, UK aut Total, organic and extractable-P in humus and soil beneath Sitka spruce planted in pure stands and in mixture with Scots pine [Elektronische Daten] [B. Williams] Total, organic and extractable P were measured in the humus and underlying soil to 10 cm depth beneath Sitka spruce (SS) and mixed Sitka spruce and Scots pine (SS+SP) stands planted on upland heath. The humus beneath SS+SP contained significantly (p<0.01) greater amounts of total and organic-P than that in SS and the mixed stands had more effectively retained approximately 87 per cent of previously applied fertilizer-P, totalling 100 kg P ha−1, compared with 70 per cent in SS. Despite the larger amounts of total-P in the mixed plots 0.01 M CaCl2 extractable molybdate reactive phosphorus (MRP) was significantly (p<0.05) greater in SS+SP humus only during March and April. Greater concentrations of MRP were released from the humus and soil during July and August at a mean rate of 58 g P ha−1 day−1. This coincided with drying of the soil during the summer and the rate of release, attributed to death of fine roots and microorganisms, was 4 to 30 times greater than reported values for rates of net mineralization of P from forest soils. Kluwer Academic Publishers, 1996 heathland nationallicence phosphate nationallicence Scots pine nationallicence Sitka spruce nationallicence Plant and Soil Kluwer Academic Publishers; gopher://gopher.wkap.nl 182/2(1996-05-01), 177-183 0032-079X 182:2<177 1996 182 11104 https://doi.org/10.1007/BF00029049 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00029049 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Williams B. Macaulay Land Use Research Institute, Craigiebuckler, AB15 8QH, Aberdeen, Scotland, UK aut NATIONALLICENCE 773 0- Plant and Soil Kluwer Academic Publishers; gopher://gopher.wkap.nl/ 182/2(1996-05-01), 177-183 0032-079X 182:2<177 1996 182 11104 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer