前言毛白杨是我国特有树种,栽培历史悠久。它具有生长快,寿命长(至今在陕西保存有200年以上的大树),干直,材优的特点,是黄河中下游地区广泛栽培的树种之一。我所与西北农学院林学系,于1960年在武功三道原营造了毛白杨速生丰产试验林。为了探索毛白杨栽培措施的生理基础,在1962～1963年进行了毛白杨光合作用的研究。二、实验材料与方法研究对象为1960年1月营造的不同栽培措施毛白杨速生丰产试验林。造林地原为苗圃,地势平坦,灌溉便利,排水良好,地下水位3米左右。土壤为深度熟化的草甸黑褐土,土层深厚,呈弱碱性反应。有机质和全氮、磷、钾含量丰富,速 Populus tomentosa is endemic to China tree species, cultivation has a long history. It has fast growth and long life (so far preserved in Shaanxi Province for more than 200 years of large trees), dry straight, Tianyou characteristics, the middle and lower reaches of the Yellow River is widely cultivated species. I and Northwest College of Agriculture Department of Forestry, in 1960 martial arts three original build Populus fast-growing test forest. In order to explore the physiological basis for the cultivation of Populus tomentosa, the photosynthesis of Populus tomentosa was studied from 1962 to 1963. Second, the experimental materials and methods The object of study in January 1960 to create different cultivation measures Populus fast-growing test forest. Afforestation originally nursery, flat, irrigation facilities, well drained, groundwater level of about 3 meters. The soil is a dark brown cinnamon soil with deep maturation. The soil layer is deep and has a weak alkaline reaction. Organic matter and total nitrogen, phosphorus, potassium content, speed