Structure and function of ever green broad-leaved environmental protection forests created in industrial area

1.年平均凋落物总量为7.6吨/公顷(5.7-8.5吨/公顷)。凋落物中落叶所占比例最大，A盆为63-86%，B样地为73-86%；凋落物季节变化表现出与天然常绿阔叶林相同的特征；5月份凋落物急剧增加，高凋落物一直持续到夏末至9月。2.在东大岛和热海测定了凋落物累积量和凋落物质量，得出年均分解率分别为%和84%。Atami分解较快的原因被认为是土壤动物丰富，凋落物主要由快速分解的尖锥变种组成。树冠透雨中的烟尘含量是雨水中的1.2-2.7倍。降到环境保护林地面的烟尘和粉尘夏季较多，冬季较少，与降雨量的差异相对应。4.自1995年以来，每100m^2的二氧化碳固定量一直在增加。在2004年以来从未间伐的样地中，土壤中的CO2.5含量最大，为1652 kg-CO2.5。附近土壤动物的供应来源被认为是造成这些高指数的原因。即使在相同的环境保护林中，土丘底部的自然度指数也比上部高，因为那里有更多的凋落物积累。

1.The annual total litterfall averaged at 7.6ton/ha (5.7-8.5ton/ha). Fallen leaves formed the greatest portion of the litterfall ; 63-86% at pot A, and 73-86% at plot B.Seasonal changes in litterfall displayed the same characteristics as a natural evergreen broad-leaved forest ; showing a drastic increase in May, with high litterfall continuing through late Summer until September.2.Litter accumulation mass and litterfall mass was measured at Higashi-Ohgishima and Atami to derive average annual decomposition rates, which were 64% and 84%, respectively. The reasons for faster decomposition at Atami are assumed to be that soil animals were rich and that litter consisted mainly of fast-decomposing Castanopsis cuspidate var. sieboldii, among other things.3.The amount of soot and dust contained in canopy throughfall was 1.2-2.7 times the amount in rainwater. The amount of soot and dust falling to the floor of the environmental protection forest was greater in the summer and less in the winter, corresponding to differences in the amount of rainfall.4.The sequestered amount of carbon dioxide per 100 m^2 has been increasing since 1995. The amount was greatest in the plot that had never been thinned since 2004 at 1652 kg-CO2.5.The present of supply sources of soil animals in vicinity is considered to have contributed to these hig index values. The index of naturalness was higher at the bottom of the mound, where more litter accumulation exists, compared to the upper portion even in the same environmental protection forest.