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Titolo:
The contribution of stone cover to biological activity in the Negev Desert, Israel
Autore:
Lahav, I; Steinberger, Y;
Indirizzi:
Bar Ilan Univ, Fac Life Sci, IL-52900 Ramat Gan, Israel Bar Ilan Univ Ramat Gan Israel IL-52900 Sci, IL-52900 Ramat Gan, Israel
Titolo Testata:
LAND DEGRADATION & DEVELOPMENT
fascicolo: 1, volume: 12, anno: 2001,
pagine: 35 - 43
SICI:
1085-3278(200101/02)12:1<35:TCOSCT>2.0.ZU;2-R
Fonte:
ISI
Lingua:
ENG
Soggetto:
MICROBIAL BIOMASS RESPONSE; SOIL ORGANIC-MATTER; WATER; SNAILS;
Keywords:
desert; stone cover; biological activity; chlorophyll;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
31
Recensione:
Indirizzi per estratti:
Indirizzo: Steinberger, Y Bar Ilan Univ, Fac Life Sci, IL-52900 Ramat Gan, Israel BarIlan Univ Ramat Gan Israel IL-52900 Ramat Gan, Israel
Citazione:
I. Lahav e Y. Steinberger, "The contribution of stone cover to biological activity in the Negev Desert, Israel", LAND DEGR D, 12(1), 2001, pp. 35-43

Abstract

Ancient valley agriculture in the northern Negev highlands was based on the principle of directed collection of water and eroded material from the slopes and their consequent flow towards the valleys. The stones on these slopes were therefore removed and/ or collected into piles known as 'grape mounds'. The aim of this study was to understand the contribution of stone cover and slope-facing to biological activity in soil. Soil samples from a depth of 0-5 mm from the soil surface were collected during the study period (December 1994-March 1996) from northern and southern hill slopes, from under limestones and between stones. Soil moisture, organic matter, chlorophyll-a and soil respiration were determined. The results obtained in field and laboratory studies demonstrated differences between the northern and southern slopes. The stone cover on the northern slope made up 33 per cent and inthe southern slope 23 per cent, stone size ranging from 15-50 cm(2) and 15-35 cm(2), respectively. Soil moisture content varied from 12 per cent in December 1994 on both slopes to one-quarter of the initial value during the dry period. Organic matter content reached a maximal level of 14 per cent and 16 per cent on the northern and southern slopes, respectively. Values ofchlorophyll-a on both the northern and southern slopes were 0.38 mug g(-1)dry soil during the wet season, decreasing to 0.05 mug g(-1) dry soil during the dry period. Soil samples from under the stones on both slopes produced high levels of CO2, ranging between 50 and 100 mug CO2 g;(-1) dry soil h(-1), whereas in the control samples the levels ranged between 30 and 70 mug CO2 g(-1) dry soil h(-1). In conclusion, the stone cover apparently playsan important role in the maintenance of biological activity through its contribution to slope biotope stability. Copyright (C) 2001 John Wiley & Sons, Ltd.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 30/03/20 alle ore 19:49:01