论文部分内容阅读
多年封育研究结果表明,对因放牧过度而遭到严重破坏的梭梭林,围栏封禁4年后,株高和冠幅生长恢复正常,结实母树株数封禁1年后迅速增加,得出了估测梭梭单株结实量的数学模型。封育对梭梭林内幼树数量增加不显著。梭梭林内幼树数量分布与梭梭林复盖度有关,盖度10~20%的梭梭林幼树分布数量最多,小于10%和大于30%的梭梭林内幼树数均很少。梭梭种群的发展趋势属增长型,但幼树数量和林地面积增长速度缓慢。
The results of many years of enclosure study showed that for Haloxylon forest severely damaged by overgrazing, the growth of plant height and crown returned to normal after four years of enclosure ban, and the number of sturdy parent trees increased rapidly after 1 year of banning. Mathematical model of per plant yield of Haloxylon ammodendron. The number of saplings in Haloxylon ammodendron increased not significantly. The distribution of saplings in Haloxylon ammodendron was related to the coverage of Haloxylon ammodendron. The distribution of saplings in Haloxylon ammodendron seedlings with the coverage of 10% to 20% was the largest, while those of Haloxylon ammodendron forests with less than 10% and more than 30% were very few. The development trend of Haloxylon ammodendron population is a growth type, but the growth of saplings and woodland area is slow.