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首页> 外文期刊>Scandinavian Journal of Forest Research >Effects of irrigation, fertilization and drought on the occurrence of Lophodermium piceae in Picea abies needles.
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Effects of irrigation, fertilization and drought on the occurrence of Lophodermium piceae in Picea abies needles.

机译：灌溉，施肥和干旱对青海云杉针叶青霉发生的影响。

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摘要

The effects of irrigation, drought and fertilizing on the frequency of the fungal [non-pathogenic] endophyte Lophodermium piceae in green needles were assessed in a 30-yr-old experimental stand of Picea abies (planted in 1966) at Skogaby in southernSweden. The 5 experimental treatments, which started in 1988, were: (1) irrigation from mid-May to the end of September, (2) irrigation + fertilizing with N (as nitrate and ammonium) with complete mineral nutrients in aqueous solution (except for Ca which was added as limestone), (3) fertilizing with solid ammonium sulfate without irrigation, (4) drought (established by intercepting rain with a transparent plastic roof from April to October), and (5) no treatment (control). Needles were sampled in August and November 1992 and/or September 1996 (age classes 6, 2 and 3 yr, respectively). Frequencies of needles with L. piceae were lower in the irrigation and ammonium sulfate fertilizer treatments than in the control. Drought treatment frequencies were similar to the control values. Needles were susceptible to colonization for at least 3 yr, and colonization increased with needle age. The results indicate that the increased availability of water to the root system as well as ammonium sulfate fertilizingindirectly delays colonization of needles by L. piceae.
机译：在瑞典南部Skogaby的一个30岁的云杉（实验于1966年种植）的试验林中，评估了灌溉，干旱和施肥对绿针内真菌[非致病性]内生黑麦草皮发生频率的影响。从1988年开始的5种试验处理方法是：（1）从5月中旬到9月底灌溉，（2）灌溉+在水溶液中添加完全矿质营养的N（硝酸盐和铵盐）施肥（除作为石灰石添加的Ca），（3）不用灌溉就用固体硫酸铵施肥，（4）干旱（4月至10月通过用透明塑料屋顶遮挡雨水建立）和（5）未进行处理（对照）。在1992年8月，1992年11月和/或1996年9月对针进行了采样（分别为6、2和3年年龄）。在灌溉和硫酸铵肥料处理中，带有L. piceae的针的频率低于对照组。干旱处理频率与控制值相似。针头易于定植至少3年，并且定植随着针头年龄的增加而增加。结果表明，增加了对根系统的水分利用以及硫酸铵的施肥间接地延缓了木虱的针叶定植。

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