天宝岩天然长苞铁杉林枯落物蓄积量与水文特性研究

对天宝岩天然长苞铁杉林枯落物的蓄积量与水文特性进行研究,结果表明:天然长苞铁杉林枯落物蓄积量并不大,仅为21.38t/hm2;枯落物持水过程中增加幅度随着时间延长而减小,前1h内,枯落物吸水量增加幅度较大,但随时间延长吸水量增加幅度呈减小趋势,到12h后基本达到动态平衡,二者之间的关系模型为:Y=0.457ln(t)+0.895(r=0.6153**)。枯落物吸水速率也是随着时间延长而减小,在前15min内,枯落物吸水速率下降速度呈直线趋势,在1h后,随着时间延长,枯落物吸水速率逐渐变小,到24h时,趋近于零,二者之间的关系模型为:V=29.957t-2.0443(r=0.935**)。

Study on the Volume and Hydrological Characteristics of Withered falling Objects in the Natural Tsuga longibracteata Forests in Tianbaoyan National Nature Reserve

The storage and hydrological characteristics of forests litter in natural Tsuga longibracteata forest in Tianbaoyan Na- tional Nature Reserve were studied in this paper. The results showed that the storage of litter is only 21.38t/hm2 ;during the process of water holding of litter layer, the water holding capacity of the first 1 h were superior to the rest of time, then de- creased gradually with prolong of soaking time, and leveled off after 12 h;the equation between the water holding capacity of the litter layer and the immerse time is Y = 0.4571n （t） ＋ 0. 895 （r = 0. 6153 ＊ ＊ ） ;the water absorption rates of litters de- creased with prolong of soaking time,it showed a remarkably direct linearity tendency in the first 15 min, drop the speed to slow down gradually after 1 h, and fell to zero after 24 h;the equation between the water absorption speed of the litter layer and the immerse time is V = 29.957t-2.0443 （r =0.935 ＊ ＊ ）.