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毛白杨(Populus tomentosa Carr.)是我国北方特有的深受群众喜爱的乡土树种。和其他杨树一样,在较贫瘠的土地上栽植,生长缓慢,不能得到令人满意的收益。在林木生长过程中合理施肥,是保证林木速生丰产必不可少的条件。为探索经济高效的施肥量,1983年雨季前,我们在饶阳县东里满村毛白杨片林内,进行了林木施肥试验.1 试验林地概况试验林木为1965年春定植的2a生苗木。株行距3m×6m,胸径20cm左右,树高19m左右。从林地地表到1.5 m深处均为沙壤土。土壤资源普查资料表明,该地为富钾地区。在林地内取0～60cm处土样,化验结果是:碱解氮23ppm,速效磷0.15ppm,全盐量0.043％,有
Populus tomentosa Carr. Is endemic to the north of China and is deeply loved by the masses. Like other poplars, planting on barren land has been slow to grow and yields no satisfactory benefit. In the process of forest growth and reasonable fertilization, is essential to ensure fast-growing forest yield conditions. In order to explore a cost-effective fertilizer application, we conducted a forest fertilization experiment in the forest of Populus tomentosa in Dongli Man Village, Raoyang County before the rainy season of 1983. 1 Overview of the experimental forestland The experimental forest was a 2a-year-old seedling planted in the spring of 1965. Plant spacing 3m × 6m, diameter about 20cm, about 19m high tree. From the forest surface to 1.5 m deep are sandy loam. Soil resources census data show that the area is potassium-rich areas. In the woodland to take 0 ~ 60cm at the soil samples, the test results are: alkali hydrolysis of nitrogen 23ppm, available phosphorus 0.15ppm, total salt 0.043%, there