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SCI论文目录 |
鼎湖山针阔叶混交林土壤呼吸的研究 |
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| 出 版 社：北京林业大学学报 |
| 发表时间：2005 |
| 台 站：
鼎湖山森林生态系统定位研究站
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| 作 者：周存宇 周国逸 王迎红 张德强 刘世忠 王跃思 孙扬 |
| 点 击 率：6846 |
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| 关 键 字：鼎湖山 土壤呼吸 Q10值 土壤温度 |
| 摘 要：利用静态箱气相色谱法对鼎湖山针阔叶混交林的土壤呼吸速率的季节变化和昼夜变化,进行了为期1年的野外观测研究.自然状态下土壤呼吸速率的年平均值为(400±29)mg(CO2)(m2•h),其中由凋落物分解释放的CO2占土壤总呼吸的年平均比例为42%;土壤呼吸速率与林内气温、地表温度、地下5、10、15和20cm土壤温度都呈显著指数相关,用土壤呼吸速率与温度间的指数模型得出对应于以上各温度的Q10值变动在1.92～2.81之间;土壤呼吸速率与土壤含水量的关系依观测点土壤水分状况不同而有一定差异;土壤呼吸速率的日变化模式在雨季和旱季有明显区别,相对于温带陆地生态系统而言,该林型土壤呼吸速率的日较差较小. |
| 关 键 字(英文)：Dinghushan Mountain Biosphere Reserve soil respiration Q10 value soil temperature |
| 摘 要(英文)：Field experiment was carried out to examine the soil respiration rate by using static chamber-gas
chromatograph technique in a coniferous and broad-leaved forest in Dinghushan Mountain Biosphere Reserve for
one year. The results show that mean annual soil respiration rate is (400 ±29) mg(CO2 )P(m2·h) , while CO2
from the litter decomposition accounts for 42 % of the total CO2 emission from the soil surface. Significant
relationships are found between soil respiration rate and ambient air temperature , soil temperatures at different
depths(the surface , 5 cm depth , 10 cm depth , 15 cm depth and 20 cm depth) , which could be best
described by exponential equations. The Q10 values based on air temperature and soil temperature at surface ,
5 , 10 , 15 and 20 cm depth vary from 1192 to 21811 The relationships between soil respiration rate and soil
water content in the two observation sites vary with the soil water regime. The diurnal pattern of soil respiration
rate in the rainy season is distinctly different from that in the dry season. Compared with temperate terrestrial
ecosystems , this subtropical forest has a smaller diurnal variation of soil respiration rate. |
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 鼎湖山针阔叶混交林土壤呼吸的研究.PDF |
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