太行山区主要森林类型叶枯落物及土壤持水特性对郁闭度的响应OA

In this study,the typical forest stands of Pinus tabuliformis,Platycladus orientalis and Robinia pseudoacacia in the Taihang Mountain area were taken as the research objects,and the water-holding characteristics of litterfall and soil under different canopy densities were studied by water immersion method and cutting ring method.The results showed that:(1)The litter storage of Pinus tabuliformis forest was the largest,followed by the litter storage of P.orientalis,and the smallest storage of Robinia pseudoacacia forest.The variation range of litter storage in Robinia pseudoacacia forest was 2.9～4.3 t/hm2,with that of 3.9～9.1t/hm2 in P.orientalis forest and 5.9～13.1 t/hm2 in Pinus tabuliformis forest.It is manifested that the reserve increases with the increase of canopy density.(2)There was an obvious logarithmic relationship between the water-holding capacity of the undecomposed layer and the semi-decomposed layer and the soaking time,and the water-holding capacity of the semi-decomposed layer was better than that of the undecomposed layer.The water-holding capacity of the litter was the best in Pinus tabuliformis and P.orientalis in the canopy density greater than 0.7,and the water-holding capacity of the litter was the strongest in the R.pseudoacacia forest under the canopy density of 0.4～0.7.The maximum water-holding capacity of litter in the three woodlands was as follows:Pinus tabuliformis＞P.orientalis＞Robinia pseudoacacia.(3)P.tabuliformis forest and P.orientalis gradually decreased with the increase of canopy density,and the soil bulk density gradually increased.With the increase of canopy density,the bulk density of the soil in the 0～20 cm soil layer gradually decreased,the porosity gradually increased,and the porosity of the 20～40 cm soil layer gradually decreased.