论文部分内容阅读
三、深挖抚育深挖抚育,是造林后到成林前的一项深翻改土措施。它可以改良土壤的理化性质,促进林木根系的生长发育。据观测,未经深耕的杉木幼林细根密集层一般在20厘米以内,深抚30厘米的可达30—40厘米,深抚45厘米的可达50厘米以上。杉木的根系愈合和再生能力很强,当根系被切断后很快发出较多的新根,深抚后可使细根数量增加0.3—3.3倍,从而扩大了根系的吸收范围,提高了幼林的生长。据测定,一般深抚后可使树高和直径生长增加一至数倍。目前,深抚已成为改造低产林分和促进Ⅲ类土上种杉成材的一个重要措施。对于造林前粗放整地的幼林,应尽早进行深抚;造林前撩壕、带状等局部整地的幼林根系有偏向生长的
Third, digging tending Nursing, is a reforestation after afforestation into forestry measures to change the soil. It can improve the physical and chemical properties of soil and promote the growth and development of tree roots. According to the observation, the deep rooted dense layer of young Chinese fir without deep plowing is generally within 20 cm, the depth of 30 cm up to 30-40 cm, the depth of 45 cm up to 50 cm or more. Cunninghamia lanceolata root healing and regeneration ability is strong, when the root is cut off soon after the release of more new roots, after deep rooting can make the number of fine roots increased by 0.3-3.3 times, thereby expanding the absorption of the root system to improve young forest Grow. According to the determination, the general deep after the tree height and diameter growth can increase one to several times. At present, deep care has become an important measure to rebuild low-yield stands and promote the growth of the fir seedlings on the soil of type III. Deep planting should be carried out as soon as possible for the young and well-groomed young forests before afforestation. The young roots with partial soil preparation such as tending moorings and ribbons before afforestation tend to grow in favor of growth