摘要
报道了鼎湖山季风常绿阔叶林和针阔叶混交林群落0~40cm土层中细根(≤2mm和2~5mm)的现存量、死亡量、生产力和周转率,并比较了用“连续钻取土芯法”和“埋无根土柱法”来估算表层土(0~20cm)细根生产力的差异。结果表明:在0~40cm土层中,季风常绿阔叶林≤2mm和2~5mm细根现存量分别为6.59thm-2和4.81thm-2,死根比率各为29.9%和22.9%;针阔叶混交林≤2mm和2~5mm细根现存量分别为5.35thm-2和4.24thm-2,死根比率各为34.4%和24.0%。细根现存量的季节性变化不显著。季风常绿阔叶林细根年分解量、年死亡量和年净生产力分别为0.90,1.59,2.65thm-2a-1(≤2mm)和0.41,0.63,1.25thm-2a-1(2~5mm),针阔叶混交林的相应数值各为0.80,1.41,2.42thm-2a-1(≤2mm)和0.37,0.62,1.21thm-2a-1(2~5mm)。季风常绿阔叶林细根年周转率为0.57(≤2mm)和0.34次a-1(2~5mm),针阔叶混交林分别为0.69(≤2mm)和0.38次a-1(2~5mm)。
Fine
roots were sampled in a monsoon evergreen broad leaved forest(MEBF),and a nearby mixed
coniferous( Pinus massoniana ) and broad leaved forest (MCBF), located in Dinghushan
Biosphere Reserve. The standing pools of live and dead fine roots in the 0 ̄40cm soil depth
were sampled seasonally for one year, annual dry mass loss of the decomposing fine roots
was measured and mortality and production were calculated. The comparison of soil coring and
in growth method for estimating the fine root production in the surface soil (0 ̄20cm) was also
made. The mean standing pools of roots ≤2mm and 2 ̄5mm in the 0 ̄40cm soil were 6
59(29 9%) and 4 81(22 9%) t·hm -2 for the MEBF, while 5 35(34 4%) and 4 24(24 0%)
t·hm -2 for the MCBF with the portion of dead roots given in parentheses. The standing pool
did not fluctuate dramatically with various sampling occasions. In the MEBF, annual mass loss,
mortality, net production for fine roots were 0 90,1 59,2 65t·hm -2 ·a -1 (≤2mm),and 0
41,0 63 and 1 25t·hm -2 ·a -1 (2~5mm),respectively. While the corresponding values
in the MCBF were 0 80,1 41,2 42 t·hm -2 ·a -1 (≤2mm),and 0 37,0 62,1 21t·hm
-2 ·a -1 (2~5mm),respectively. The annual turnover rates were 0 57(≤2mm) and 0 34
times·a -1 (2~5mm) for the MEBF, and 0 69(≤2mm) and 0 38 times·a -1 (2~5mm) for
the MCBF, respectively.
出处
《植物生态学报》
CAS
CSCD
北大核心
1999年第4期361-369,共9页
Chinese Journal of Plant Ecology
基金
国家自然科学基金
中国科学院"九五"重大项目
关键词
鼎湖山
细根
生产力
年周转率
南亚热带森林
Dinghushan Biosphere Reserve, Monsoon
evergreen broad leaved forest, Mixed coniferous and broad leaved forest, Fine roots, Annual
mortality, Annual net production, Annual turnover rate