黄土区退耕地隔坡水平沟整地对核桃生长发育的影响

隔坡水平沟整地技术显著地促进了旱坡地核桃幼树的生长发育,6年生核桃地径平均达6.12 cm,树高221 cm,冠幅245.5 cm×238.3 cm,新梢长85 cm,新梢粗1.82 cm,核桃生长迅速的特性得到了充分体现。剖根试验表明,1年生核桃幼树根系水平分布达119 cm~126 cm,垂直分布达60 cm~65 cm,水平根条数达14条~15条;3年生时,根系水平分布已达到143 cm~156 cm,根系最大分布范围已经交接;6年生时,根系已经向下延伸至4 m以下的坡面。幼树期产量迅速上升,7年生时平均产量达2.56 kg/株,1 728 kg/hm2,达到了盛果期产量的57.6%.

Effect of Soil Preparation of Slope-seperated Level Ditch on the Growth and Development of Walnut in Loess Hills

The technique of soil preparation of slope-separated level ditch effectively promote young plant growth and devel- opment of walnut. At the age of 6 years, the diameter at ground has reached 6. 12 cm averagely, and height 221 cm, crown diameter 245.5 cm × 238. 3 cm, shoot length 85 cm, shoot diameter 1.82 em. Walmut trees showed the rapid growth property in the area. The root test shows that, the root level distribution has reached 119 cm to 126 cm, and vertical distribution 60 emto65 cmat the age ofl year, the number of root has reached 14 to 15. At the age of 3 years in5 m×3 m close planting garden, the root largest distribution ranges have been joined. The yields increased rapidly at young growth stage. At the age of 7 years, the yields of average single-plant reached 2. 56 kg, and that of per hm2 1 728 kg, reaching 57.6 percent in full fruit period.