Response of citrus trees to modified radiation regime in semi-arid conditions
| Autor: | Moises Cohen, Loic Le Guillou, Shabtai Cohen, S. Moreshet, Jean-Christophe Simon |
|---|---|
| Rok vydání: | 1997 |
| Předmět: | |
| Zdroj: | Scopus-Elsevier |
| ISSN: | 1460-2431 0022-0957 |
| Popis: | Citrus trees are characterized by a large canopy and low hydraulic conductivity. In Israel's semi-arid summer climate this could cause transpiration to exceed water uptake and cause temporary excessive water deficits. It was hypothesized that reduction of radiative load would reduce transpiration and thus reduce deficits. Net radiation of lemon trees in the hottest season was reduced by shading hedgerows with reflective nets for approximately one month in both 1994 and 1995. Stem sap flow and climate variables were measured continuously. Daily courses of leaf conductance and leaf water potentials were measured on selected days. Midday net radiation below the dense and sparse shade net treatments was 47% and 73% of that above the control trees. Midday 'sunlit' leaf temperatures below the nets were reduced by 2.7 and 1.6°C, respectively. The reduction in net radiation caused large changes in leaf conductance. Average midday sunlit leaf conductance measured in 1995 under the dense and sparse treatments and control were 4.1, 2.9 and 1.8 mm s -1 , respectively (significantly different at P |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|