caa a22 4500 469096772 CHVBK 20180323133033.0 cr unu---uuuuu 170328e19920301xx s 000 0 eng 10.1007/BF00317406 doi (NATIONALLICENCE)springer-10.1007/BF00317406 Soil solution phosphate, root uptake kinetics and nutrient acquisition: implications for a patchy soil environment [Elektronische Daten] [M. Caldwell, L. Dudley, B. Lilieholm] Summary: The importance of increased root phosphate (P) uptake kinetics, root proliferation and local increases of soil solution P (P1) for P acquisition from fertile soil microsites was explored with a simulation model and calculated uptake was compared with experimental data. Based on the partitioning of added P in microsites to P1 and P adsorbed on soil particles and the results of a dual-isotope-labeling experiment (Caldwell et al. 1991a), acquisition of P from the fertile microsites was some 20 X that of uptake from an equal volume of soil which received only water. Simulations were in general agreement and also showed that elevation of root P uptake kinetics could contribute more to the increased acquisition than did root proliferation under these circumstances. Although increased physiological uptake capacity for P has generally been considered to be of little benefit because of diffusion limitation, in patchy soil environments selective elevation of P uptake kinetics in fertile microsites may be of considerable benefit. These tests were conducted in calcareous soil which releases much less P into the soil solution than do many other soils. In many noncalcareous soils the benefits of selective elevation of root uptake kinetics would likely be greater. Springer-Verlag, 1992 Soil phosphate nationallicence Root kinetics nationallicence Root proliferation nationallicence Agropyron desertorum nationallicence Artemisia tridentata nationallicence Caldwell M. Department of Range Science and the Ecology Center, Utah State University, 84322-5230, Logan, UT, USA aut Dudley L. Department of Plants, Soils and Biometeorology, Utah State University, 84322-4820, Logan, UT, USA aut Lilieholm B. Department of Plants, Soils and Biometeorology, Utah State University, 84322-4820, Logan, UT, USA aut Oecologia Springer-Verlag 89/3(1992-03-01), 305-309 0029-8549 89:3<305 1992 89 442 https://doi.org/10.1007/BF00317406 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00317406 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Caldwell M. Department of Range Science and the Ecology Center, Utah State University, 84322-5230, Logan, UT, USA aut NATIONALLICENCE 700 1- Dudley L. Department of Plants, Soils and Biometeorology, Utah State University, 84322-4820, Logan, UT, USA aut NATIONALLICENCE 700 1- Lilieholm B. Department of Plants, Soils and Biometeorology, Utah State University, 84322-4820, Logan, UT, USA aut NATIONALLICENCE 773 0- Oecologia Springer-Verlag 89/3(1992-03-01), 305-309 0029-8549 89:3<305 1992 89 442 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer