大兴安岭山杨低质林改造对枯落物持水性能的影响

Effect of Litters in a Populus davidiana Low-quality Forest on Water-holding Capability in Daxing 'an Mountains

以大兴安岭山杨低质林带状改造后枯落物持水性能为研究对象,应用主成分分析法建立不同模式改造后山杨低质林枯落物持水性能的综合评价指标体系,对各个样地改造后的持水性能进行综合分析。结果表明:不同样地的枯落物持水量、吸水速率与浸泡时间之间分别满足对数关系和乘幂关系。不同改造模式下,枯落物持水性能综合得分从大到小依次为S_2、S_5、S_6、S_7、对照样地、S_8、S_3、S_1、S_9、S_4,其中S_2样地的综合得分最高,表明10 m改造带中20 m保留带的改造模式下枯落物持水性能最佳。

We studied the water-holding performance changes of the litters in a Populus davidiana low-quality forest after 3S bandwidth alteration in Daxing＇an Mountains,and analyzed all the indexes of litter water-holding performance and the water-holding process. The principal component analysis was applied to establish a comprehensive evaluation index system for litter water-holding performance in the P. davidiana low-quality forest after different alteration modes,and comprehensive evaluation of the alteration effects of the sample plots was conducted. The litter water-holding capacity and absorption rate in different sample plots showed logarithmic relationship and exponentiation relationship,respectively,with the soaking time of litters. The descending order of the comprehensive performance in different alteration modes was S_2,S_5,S_6,S_7,CK,S_8,S_3,S_1,S_9,and S_4. The score of the sample plot S_2 was the highest,which indicated that the alteration mode of10-m bandwidth with 20-m reserve belt had the best litter water-holding performance.