桫椤生态系统的土壤呼吸特征
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国家科技部973资助项目(2005CB42207; 2005CB422208); 国家自然科学基金资助项目(40671132);国家科技部数据共享平台建设资助项目( 2006DKA32300-08)


The soil respiration of Alsophila spinulosa ecosystems
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    摘要:

    桫椤植物最早出现于中生代的晚三叠纪或早侏罗纪,现存的桫椤林是一种非常典型的孓遗陆地生态系统。对桫椤生态系统土壤呼吸特征研究表明,6月份桫椤纯林的土壤呼吸速率很小,去除凋落物和保留凋落物的土壤呼吸速率分别为0.87、089μmol·m-2·s-1,两种处理无显著差异(P>0.05)。由于其它生物的入侵,在保护区桫椤林中出现了多种混交的森林类型,比较典型的是毛竹、落叶阔叶林、常绿阔叶林作为桫椤纯林的入侵种与其形成的3种生态系统类型,根据测定的结果,表明这3种生态系统类型的林地土壤呼吸速率均大于桫椤纯林,平均值分别为2.95、2.06、1.33μmol·m-2·s-1,经统计分析,发现它们与桫椤纯林有显著的差异(P<0.001)。凋落物对这3种类型的影响表现为,毛竹桫椤混交林、常绿阔叶桫椤混交林差异显著(P<0.001),落叶阔叶和桫椤混交林差异不明显(P>0.05 );在较短时间尺度上对4种森林类型的日动态分析,均表现为一致的平稳状态。在土壤温度和湿度变化较小的情况下,两种处理5cm土壤温度和湿度均与土壤呼吸无明显相关性。

    Abstract:

    Alsophila spinulosa appeared mostly in the early Lias or late Trias of the Mesozoic period. The soil respiration characteristics of Alsophila spinulosa forest as a typical living fossil terrestrial ecosystem,was studied. The result indicated that the soil respiration rate of Alsophila spinulosa forest is very low in June,the soil respiration rate with litter and without litter are 0.87μmol·m-2·s-1 and 0.89μmol·m-2·s-1, respectively, the two processes have not difference significantly(P>0.05). As a result of invasion by other species, include bamboo, deciduous broad\|leaf tree and evergreen broad-leaf tree, Alsophila spinulosa with them formed other three mixed forests. Based on the results, we found that the soil respiration rates of the three mixed forests are higher than the Alsophila spinulosa forest. The mean soil respiration rate are 2.95, 206μmol·m-2·s-1, and 1.33μmol·m-2·s-1, respectively. It were found that they have significantly difference with Alsophila spinulosa forests (P<0.001) after a statistical analysis.The influence of litter for three forests are that the bamboo-Alsophila spinulosa mixed forest (MF) and evergreen broadleaf-Alsophila spinulosa mixed forest (CF) both have significant differences (P<0.001), however, the deciduous broadleaf -Alsophila spinulosa mixed forest (LF) has no significant difference (P>0.05). In a short time period, analyzing the daily dynamic soil respiration rates of the four forests, they display a consistent steady process. The variation of soil temperature and humidity are not closely relative with the soil respiration of four Alsophila spinulosa forests.

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原焕英,江洪*,余树全.桫椤生态系统的土壤呼吸特征.生态学报,2009,29(6):3316~3321

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