Biomass and production of fine roots in Japanese forests
Biomass and production of fine roots in Japanese forests
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DOI：
10.1007/s10310-006-0262-3
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发表时间：
2007-04
影响因子：
1.5
通讯作者：
K. Noguchi;B. Konôpka;T. Satomura;S. Kaneko;Masamichi Takahashi
中科院分区：
文献类型：
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作者：
K. Noguchi;B. Konôpka;T. Satomura;S. Kaneko;Masamichi Takahashi
为了更好地了解日本森林细根动态的控制，我们回顾了在日本进行的细根生物量和产量的研究。细根生物量的大部分数据来自有限区域的针叶林；优势树种的平均细根生物量从松种（n= 3）的~ 50 g m−2到日本柳杉（n= 4）和长叶杉（n= 3）的~ 600 g m−2不等。这些值与主要在北美或欧洲的其他温带森林报告的值相当或更低。关于日本森林细根生产的资料仍然有限。在两种落叶林中，细根产量占净初级生产力的约30%，但在日本针叶林中没有类似的数据报告。在日本森林中，坡位是控制细根生物量的关键参数，细根生物量在坡上大于坡下，这可能是因为土壤资源有效性在坡上降低。对人工土壤环境的研究（例如，去除穿透物来模拟干旱）也表明，细根生物量和产量受到土壤环境变化的极大影响。近年来，通过对薄壁chamaecyparis obtusa的解剖分析，探讨了细根动力学的生理控制。日本的研究结果一般支持从其他温带地区获得的细根生物量和产量数据。进一步阐明坡位（土壤资源有效性）对细根生产的影响将有助于更详细地了解日本森林细根动态。
To better understand the control of fine-root dynamics in Japanese forests, we reviewed studies conducted in Japan on fine-root biomass and production. Most of the data on fine-root biomass were obtained for conifer plantations in limited regions; the average fine-root biomass of dominant trees ranged from ∼50 g m−2forPinusspecies (n= 3) to ∼600 g m−2forCryptomeria japonica(n= 4) andChamaecyparis obtusa(n= 3). These values are comparable with or less than those reported for other temperate forests mainly in North America or Europe. Information on fine-root production in Japanese forests remains limited. Fine-root production accounted for ∼30% of the net primary productivity in two deciduous forests, but similar data was not reported for coniferous forests in Japan. In Japanese forests, slope position is a key parameter controlling fine-root biomass that is greater on upper slopes than on lower slopes, probably because soil resource availability decreases upslope. Studies in manipulated soil environments (e.g., removing throughfall to simulate drought) also suggested that fine-root biomass and production were greatly affected by altered soil environments. Physiological control of fine-root dynamics was recently discussed via anatomical analyses ofChamaecyparis obtusa. Findings from Japanese studies generally support data on fine-root biomass and production obtained from other temperate regions. Further attempts to elucidate the influence of slope position (soil resource availability) on fine-root production would be useful to gain a more detailed understanding of the fine-root dynamics in Japanese forests.