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The biomass and spatial distribution of root system of dipterocarps in the tropical rain forest.

热带雨林龙脑香科植物根系生物量及空间分布.

基本信息

批准号：
17570020
负责人：
KIKUCHI Junichi
金额：
$ 2.43万
依托单位：
Nara University of Education
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2007
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17570020/
关键词：
dipterocarps root system mycorrhiza biomass tropical rain forest

项目摘要

Spatial distribution and biomass of root system of dipterocarp trees were studied in the University forest of Gadja Mada Univ. in Jambi, Sumatera. Annual rain fall in the research area is around 2600 mm, mean temperature is around 28 C.For the estimation of biomass of- dipterocarp trees, a study plot (1 ha) was established in a mixed dipterocarp forest. A total of 402 trees were mapped and dipterocarp trees occupied 25% of the basal area in the plot. Many rubber trees are also found because this area was long been used as rubber plantation, which protected this area from illegal logging. Other dominant tree families were Myrtaceae, Burseraceae, Sapindanaceae, Euphorbiaceae, Mimosaceae, Rhizophoraceae, Oxalidaceae. Several dipterocarp trees and one Eugenia exceeded more than 1 m diameter at breast height.Root biomass and spatial distribution was measured for 11 Shorea parvifolia trees. The diameters of sampled trees were 10-75 cm at breast height. For the smaller trees (<20cm), half of … More roots were excavated and weighed. For the larger trees, about one fourth of the roots were sampled. Root distribution of trees were mostly restricted within 4 to 8 m from the trunk for smaller trees while those of larger trees ranged 12-25m from the trunk. Most of the lateral roots distributed in the upper 80 cm soil layer. The biomass of roots ranged between 3 and 620 kg. The tap and buttress roots accounted the around half of the biomass of the root systems and the ratio of tap roots to lateral roots were high in the smaller trees than the larger tree. The amount of mycorrhizas were quantified for the smallest tree. The biomass of mycorrhizas was very small and ranged 30-1670 g. However, they seems to play important roles in the absorption of nutrients because most of mycorrhizas and fine roots were distributed within the LFH layer where most of the nutrients were released. In the deeper soil layer almost no mycorrhizas were found and amount of fine roots with heavy branching was also rare in the deeper soil. Less

研究了苏门答腊詹比加加马达大学森林中龙脑香树根系的空间分布和生物量。在研究区域的年降雨量约为2600毫米，平均温度约为28摄氏度。为了估计龙脑香树的生物量，在龙脑香混交林中建立了一个研究小区（1公顷）。共绘制了402株树木，龙脑香树占样地断面积的25%。这里还发现了许多橡胶树，因为这一地区长期以来一直被用作橡胶种植园，这保护了这一地区免受非法砍伐。其它优势科为桃金娘科、橄榄科、无患子科、大戟科、含羞草科、红树科、酢浆草科。对11株小叶杉的根系生物量及其空间分布进行了测定。样木胸径10-75 cm。对于较小的树木（<20 cm）， ...更多信息挖出根并称重。对于较大的树木，约四分之一的根进行了采样。树木根系分布主要集中在距树干4 ~ 8 m范围内，而大树根系分布在距树干12- 25 m范围内。侧根主要分布在80 cm土层以上。根系生物量在3 ~ 620 kg之间。主根和扶主根约占根系生物量的一半，且小乔木主根与侧根的比例高于大乔木。对最小的树的菌根的量进行量化。菌根的生物量很小，在30-1670 g之间。然而，它们似乎在养分吸收中起着重要作用，因为大部分菌根和细根分布在LFH层中，其中大部分养分被释放。在深层土壤中几乎没有发现菌根，而且在深层土壤中也很少有大量分枝的细根。少