灌溉对种子园油松生长与开花的影响

在辽宁省兴城种子园对油松无性系9年生树进行连续二年的灌溉试验,5月1日开始每10天(1983年)或7天(1984年)灌溉一次,10月底停止灌溉,每株每次灌溉量0、180和300公斤,灌溉植株当年针叶长度和重量显著增加,第二年高生长增加25.7—34.8％。灌溉使针叶叶绿素含量比对照增加10.2—11.4％,含氮量增加4.8—8.9％。但是,灌溉使针叶含磷量比对照降低6.5—12.9％,含钾量降低0—11.4％。灌溉使雌球花略有增加。

EFFECT OF IRRIGATION ON GROWTH AND FLOWERING OF PINUS TABULAEFORMIS IN SEED ORCHARD

Irrigation experiments were carried out successively with 9 years old grafted clones of Pinus tabulae formis for 2 years in Xingcheng seed orchard, Liaoning Province. The irrigation was conducted from May 1st to the end of October using three treatments, applying 0,180 and 300 kg of water per tree at intervals of 10 days in 1983, and 7 days intervals in 1984. Needle length and weight of irrigated trees increased remarkably after first year of irrigation, and the top shoot length showed dramatic increment only in second year. Irrigation increased chrolophll content by 10.2-11.4%, and nitrogen content of needles by 4.8-8.9%. However, phosphorus content of needles of irrigated trees decreased by 6.5-12.9%, potassium content by 0-11.4%. Irrigation slightly increased cones production.