摘要
该文对北京西山4种不同林分林下枯落物层的储量、持水量、持水率和吸水速率进行了研究。结果表明:①元宝枫枯落物储量最大(14.07t/hm2),其次为栓皮栎(11.80t/hm2)、油松(10.66t/hm2),侧柏储量最小(6.90t/hm2)。②枯落物持水量的排序为元宝枫>栓皮栎>油松>侧柏;各林分枯落物最大持水量为元宝枫3.77mm、栓皮栎3.03mm、油松2.20mm、侧柏1.27mm。③枯落物最大持水率在184.74%～267.57%之间,排序为元宝枫>栓皮栎>油松>侧柏,其中元宝枫的持水能力最强而侧柏的持水能力最弱。④4种林分不同层次枯落物持水量随着浸水时间的增加按照对数方程W=alnt+b增加。⑤各林分不同层次枯落物吸水速率与浸水时间之间的关系式为S=a+bt-1;在0～2h内吸水速率较快,在8h左右吸水速率明显减缓。
Characteristics of litter layer of four different forest stands in Xishan Mountain in Beijing were studied,such as storage,water holding capacity,proportion of water holding capacity,and water absorption rates.Results show that the litter storage of Acer truncatum was the largest(14.07 t/hm2),followed by Quercus variabilis(11.80 t/hm2),Pinus tabulaeformis(10.66 t/hm2),and Platycladus orientalis(6.90 t/hm2).The order of total water holding capacity of litter was A.truncatum(3.77 mm)>Q.variabilis(3.03 mm)> P.tabulaeformis(2.20 mm)>P.orientalis(1.27 mm);the maximum proportion of water holding capacity ranged from 184.74% to 267.57%,and the order was A.truncatum>Q.variabilis>P.tabulaeformis>P.orientalis.It means that the litter of A.truncatum has the maximum water holding ability,and P.orientalis the least.Water holding capacity of four undecomposed litters and half-decomposed litters increased logarithmically over time immersed in water,as the equation w=alnt+b.The relation formula of the water absorption rates and immersion time was S=a+bt-1.The water absorption rate was faster within the first two hours,slowing down obviously around eight hours.
出处
《北京林业大学学报》
CAS
CSCD
北大核心
2008年第S2期177-181,共5页
Journal of Beijing Forestry University
基金
北京市科委重大项目(D0706001000091)
“十一五”国家科技支撑计划项目(2006BAD03A02)
关键词
枯落物
持水量
持水率
吸水速率
litter
water-holding capacity
proportion of water holding capacity
water absorption rate
