Accumulation amounts and water holding characteristics of litter in the typical 8 tree species of Linpan settlements in the western Sichuan Plain
Litters play an important role in maintaining the soil moisture(holding,interception and evaporation),fertility,and nutrient balance of forests.But so far,no reports have focused on the rainfall absorption and interception effects of litters in Linpan settlement(or simply Linpan).In order to explore the accumulation and water holding characteristics of the litters,both on the ground surface and in the soil of 8 pure forests in Linpan were measured,using a combination method of outdoor investigation and indoor immersion experiment.Results showed that the mean annual accumulation amount of litters on the ground surface of the eight tree species was(7935.52±6042.96)kg·hm-2,and the mean annual accumulation amount of litters in the soil was(2765.70±2206.40)kg·hm-2.The litter accumulations among the 8 forest species were significantly different.The mean annual litter accumulation of deciduous forest species(11944.14 kg·hm-2)was 1.29 times of that of evergreen trees(9265.00 kg·hm-2).The litter accumulations were in following sequence:Pterocarya stenoptera>Neosinocalamus affinis>Broussonetia papyrifera>Cinnamomum camphora>Phyllostachys praecox>Ginkgo biloba>Metasequoia glyptostroboide>Lindera megaphylla.The natural water holding rate of litters in the soil(4.54%-20.39%)was much higher than that of litters(4.97%-10.01%)on the ground surface.The water absorption rate of litters reached a peak after 5 minutes of soaking,and then reached saturation after 12 hours of soaking.The water absorption rate of litter was significantly related to the soaking time.The effective water holding capacity,effective water holding rate,and the runoff interception capacity of litter on the ground surface,were higher than those of litter in the soil.There was a significant correlation between the runoff interception volume and litter's accumulation amount.The runoff interception volumes of P.stenoptera(66.02 t·hm-2)and N.affinis(60.06 t·hm-2)were obviously higher than those of other trees.In addition,the runoff interception capacity of litters on the ground surface was also significantly related to the effective water holding capacity,but litters in the soil showed an extremely significantly relationship with the maximum water holding capacity of litter.Therefore,the widespread use of P.stenoptera,N.affinis,and B.papyrifera is more conducive to water conservation in the western Sichuan Plain.
万方数据
维普
