冀北山地落叶松早期生长监测及管理技术

Growth observation and management of larch seedlings in northern Hebi province

落叶松是河北省中高海拔地区的主要造林树种,为了给冀北山地落叶松苗木管理及造林提供技术支撑,在孟滦林管局四合永林场和孟滦林场,对落叶松早期生长进行了监测,并对管理技术进行了研究。结果表明,华北落叶松(Larix principis-rupprechtii)及日本落叶松(L.kaempferi)1 a生苗在6月中旬前生长缓慢,7月中旬后进入生长旺盛期;日本落叶松耐寒性较差,但生长期较长;2 a生苗,华北落叶松Ⅰ、Ⅱ级造林合格苗成苗率较高,日本落叶松侧枝较多,株高、基径均比华北落叶松高。9 a生日本落叶松的生长量明显高于华北落叶松。因此,对日本落叶松有进一步研究、应用和推广的必要。

Larch is the dominant afforestation tree species in northern Hebei province. In order to provide seedling management and afforestation techniques for the region, larch growth status in very early stage is investigated in Siheyong and Mengluan Forest Centers, and related management techniques are developed. Results show that, one - year - old plantlets of Larix principis - rupprecluii and L. kaempferi grow slowly in June, but start to speed up from mid - July. L. kaempferi is found less tolerant to cold but with longer growing days in a year. For their two - year - old seedlings, L. principis - rupprecluiicould provide more standard seedlings of first and second grades for afforestation, and L. kaempferi has more branches together with higher figures of seedling height and basal diameter. For the nine - year - old larch trees, investigations show the increment of L.. kaempferi is significantly higher than that of L. principis - rupprechtii.