关山林区华北落叶松人工林初次抚育间伐研究

Study on First Tending Thinning for the Plantation of Larix principis-rupprechtii in Guanshan Forest Area

以关山林区华北落叶松人工林为研究对象,开展了华北落叶松人工林不同间伐强度对其生长影响的试验研究。结果表明:1)华北落叶松人工林间伐9a后其胸径、树高和蓄积等3项生长指标的平均生长量分别比对照增长了23.1%~154.5%、20.9%~54.0%和24.6%~42.8%。2)胸径、树高和单位面积蓄积均随间伐强度增大而增大,但当间伐强度超过40.1%后,胸径、树高和单位面积蓄积平均生长率均下降;间伐强度超过40.1%时,单位面积蓄积生长量最大。表明华北落叶松人工林初次抚育间伐时,间伐强度以40.0%效果最佳。

Taking the plantation of Larix principis-rupprechtii in Guanshan forest area as the research object, the effects of different thinning intensities on the growth of Larix principis-rupprechtii plantation were studied. The results showed that: 1. After 10 years of thinning, the average growth of DBH、Height and Volume of Larix principis-rupprechtii plantation increased by 23.1%~154.5%, 20.9%~54.0% and 24.6%~42.8% respectively compared with CK. 2. DBH, tree height and unit area accumulation increased with thinning intensity, however, when thinning intensity exceeded 40.1%, DBH, tree height and average growth rate per unit area decreased;When the thinning intensity exceeded 40.1%, the accumulation growth per unit area was the largest. The results showed that the best thinning intensity was 40.0% when the Larix principis-rupprechtii plantation was cultivated for the first time.