| 鼎湖山南亚热带森林细根生产力与周转 |
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| 引用本文： | 温达志,魏平,孔国辉,叶万辉.鼎湖山南亚热带森林细根生产力与周转[J].植物生态学报,1999,23(4):361-369. |
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| 作者姓名： | 温达志 魏平 孔国辉 叶万辉 |
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| 作者单位： | 中国科学院华南植物研究所 |
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| 基金项目： | 国家自然科学基金,中国科学院“九五”重大项目 |
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| 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6.59t·hm-2和4.81t·hm-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5.35t·hm-2和4.24t·hm-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0.90，1.59，2.65t·hm-2·a-1 (≤2mm)和0.41，0.63，1.25t·hm-2·a-1(2～5mm)，针阔叶混交林的相应数值各为0.80，1.4l，2.42t·hm-2·a-1(≤2mm)和0.37，0.62，1.21t·hm-2·a-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)。
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| 关 键 词： | 鼎湖山 季风常绿阔叶林 针阔叶混交林 细 |
PRODUCTION AND TURNOVER RATE OF FINE ROOTS IN TWO LOWER SUBTROPICAL
FOREST SITES AT DINGHUSHAN |
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| WEN Da Zhi WEI Ping KONG Guo Hui and YE Wan,Hui.PRODUCTION AND TURNOVER RATE OF FINE ROOTS IN TWO LOWER SUBTROPICAL
FOREST SITES AT DINGHUSHAN[J].Acta Phytoecologica Sinica,1999,23(4):361-369. |
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| Authors: | WEN Da Zhi WEI Ping KONG Guo Hui and YE Wan Hui |
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| Abstract: | 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. |
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| Keywords: | Dinghushan Biosphere Reserve Monsoon evergreen broad leaved forest Mixed coniferous and broad leaved forest Fine roots Annual mortality Annual net production Annual turnover rate |
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