caa a22 4500 475751264 CHVBK 20180406123524.0 cr unu---uuuuu 170329e20000201xx s 000 0 eng 10.1023/A:1009808211048 doi (NATIONALLICENCE)springer-10.1023/A:1009808211048 Root distribution, standing crop biomass and belowground productivity in a semidesert in México [Elektronische Daten] [Numa Pavón, Oscar Briones] In a semidesert community in México (Zapotitlán de las Salinas, Puebla) the vertical distribution of roots and root biomass was estimated at 0-100cm depth on two sampling dates, November 1995 (wet season) and January 1998 (dry season). Root productivity at 7 to 14.5cm depth was estimated with the in-growth core technique every two months from March 1996 to February 1998. The relationship between environmental factors and seasonal root productivity was analyzed. Finally, we tested the effect of an irrigation equivalent to 20mm of rain on root production. Seventy four percent of the total number of roots were found at 0-40cm depth. Very fine roots (<1mm diameter) were found throughout the soil profile (0-100cm). In contrast, fine roots (1-3mm diameter) were found only from 0-90cm depth, and coarse roots (>3mm diameter) from 0-60cm depth. The root biomass was 971.5gm−2 (S.D.=557.39), the very fine and fine roots representing 62.9% of the total. Total root productivity, as estimated with the ingrowth core technique, was 0.031Mgha−1 over the dry season and 0.315Mgha−1 over the wet season. Only very fine roots were obtained at all sampling dates. Rainfall was significantly correlated with very fine root production. The difference between fine root production in non-watered (0.054gm−2) and watered (0.429gm−2) treatments was significant. The last value was the same as that predicted for a rain of 20mm, according to the exponential model describing the relation between the production of very fine roots and rainfall at the site. Kluwer Academic Publishers, 2000 Desert ecosystem nationallicence Fine root nationallicence Rainfall nationallicence Root production nationallicence Watering nationallicence Pavón Numa Instituto de Ecología, A.C., Apartado, Postal 63, CP 91000, Xalapa, Veracruz, México aut Briones Oscar Instituto de Ecología, A.C., Apartado, Postal 63, CP 91000, Xalapa, Veracruz, México aut Plant Ecology Kluwer Academic Publishers 146/2(2000-02-01), 131-136 1385-0237 146:2<131 2000 146 11258 https://doi.org/10.1023/A:1009808211048 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1023/A:1009808211048 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Pavón Numa Instituto de Ecología, A.C., Apartado, Postal 63, CP 91000, Xalapa, Veracruz, México aut NATIONALLICENCE 700 1- Briones Oscar Instituto de Ecología, A.C., Apartado, Postal 63, CP 91000, Xalapa, Veracruz, México aut NATIONALLICENCE 773 0- Plant Ecology Kluwer Academic Publishers 146/2(2000-02-01), 131-136 1385-0237 146:2<131 2000 146 11258 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer