WATER-STRESS INTEGRAL - A LINK BETWEEN SHORT-TERM STRESS AND LONG-TERM GROWTH
WATER-STRESS INTEGRAL - A LINK BETWEEN SHORT-TERM STRESS AND LONG-TERM GROWTH
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DOI：
10.1093/treephys/4.4.315
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发表时间：
1988-12-01
期刊：
影响因子：
4
通讯作者：
MYERS, BJ
中科院分区：
文献类型：
--
作者：
MYERS, BJ
水分胁迫积分 (S.psi.) 是任何选定时间段内黎明前叶片水势的累积积分，是根据澳大利亚堪培拉附近的辐射松种植园每两周测量的黎明前水势来估算的。还测量了当季针叶的最终长度和年度茎断面积增量。数据是在 4 年时间内从对照地块、施肥地块、灌溉地块以及两块既施肥又灌溉的地块中收集的。在年份和处理中，年断面积增量变化了三倍。在这种变化中，91% 是由 S.psi 的变化造成的。全年，茎直径发生增长的每个月。年针伸长率的变化中，90% 是由 S.psi 的变化造成的。 8月下旬至2月下旬，为针叶生长期。在干旱年份，S.psi 的年值。在非灌溉地块中，主要由土壤含水量决定，但在非灌溉地块的湿润年份和灌溉地块的所有年份中，它与树木养分状况密切相关（r2 = 0.81）。
Water stress integral (S.psi.), the cumulative integral of pre-dawn leaf water potential over any chosen period of time, was estimated from measurements of pre-dawn water potential made every two weeks in a Pinus radiata D. Don plantation near Canberra, Australia. Also measured were final length of current-season needles and annual stem basal area increment. Data were gathered over a 4-year period from a control plot, a fertilized plot, an irrigated plot, and two plots that were both fertilized and irrigated. Among years and treatments, annual basal area increment varied over a threefold range. Of this variation, 91% was accounted for by variation in S.psi. for the entire year, during every month of which stem diameter growth occurred. Of variation in annual needle elongation, 90% was accounted for by variation in S.psi. from late August to late February, which was the period of needle growth. In dry years the annual value of S.psi. in non-irrigated plots was mainly determined by soil water content, but in wet years in non-irrigated plots, and in all years in irrigated plots, it was closely correlated with tree nutrient status (r2 = 0.81).