Ecophysiological response to severe drought in Pinus halepensis Mill. trees of two provenances
Ecophysiological response to severe drought in Pinus halepensis Mill. trees of two provenances
复制标题
DOI：
10.1023/b:vege.0000029371.44518.38
复制
发表时间：
2004-01-01
期刊：
影响因子：
1.7
通讯作者：
Schiller, G
中科院分区：
文献类型：
--
作者：
Atzmon, N;Moshe, Y;Schiller, G
由于预测的区域气候变化，在地中海针叶树中选择更耐旱的基因型（生态型）的必要性已经变得很明显。阿勒颇松（Pinus halepensis Mill.）似乎是最耐旱的松树物种之一。然而，它们遗传分化的地理趋势的存在表明种源间耐旱性的潜在巨大差异。这一假设得到了物源内部水关系的巨大差异的证实。因此，本研究的目的是比较几个阿勒颇松树种源在不同气候条件下的生态生理行为。在两个种源试验中测量了生长参数（高度和直径）和存活率，一个在内盖夫沙漠北部边缘的亚沙漠条件下种植，另一个在以色列中部沿海平原的热地中海气候条件下种植。测定了所选种源树木黎明前针叶水势、木质部液流（即蒸腾）、光合作用和水分利用效率等生态生理参数。结果表明，不可能从较有利条件下的种源表现来预测恶劣条件下的种源表现。因此，必须在最终选择的树木将被种植的确切条件下进行选择。本研究明确强调了对halepensis进行广泛选择的必要性。
As a result of predicted regional climatic changes the need to select for the more drought-tolerant genotypes (ecotypes) among Mediterranean conifers has become clear. Aleppo pine (Pinus halepensis Mill.) seems to be one of the most drought-tolerant pine species. Nevertheless, the existence of geographical trends in their genetic differentiation indicates potentially large differences in drought-tolerance among provenances. This assumption was verified by the finding of large variation among provenances in their internal water relations. Hence, the aim of this stud), was to compare the ecophysiological behaviour of several Aleppo pine provenances under contrasting climatic conditions. Growth parameters (height and diameter) and survival rate were measured in two provenance trials, one planted under sub-desertic conditions at the northern edge of the Negev desert, and the second under thermo-Mediterranean climatic conditions in the central coastal plains, Israel. Ecophysiological parameters such as: predawn needle water potential, sap flow in the xylem (i.e. transpiration), photosynthesis and water-use efficiency were measured in trees of selected provenances. The results suggest that it is not possible to predict provenance performance under harsh conditions from their performance under more favourable ones. Therefore, selection must be carried out under the exact conditions in which the trees from the resultant selection will be planted. The present study clearly emphasises the need for broad selection programs of P. halepensis.