燕山东段森林群落及灌木群落枯落物的研究

燕山东段森林群落枯落物现存量平均为４．３５－２８．６７ｔ／ｈｍ＾２，以山杨混交林、松栎混交林、椴树混交林最高，栎林和油松林次之，侧柏林最低。灌木群落枯落物现存量平均为４．１５－１８．９４ｔ／ｈｍ＾２，低于森林群落。森林枯落物现存量受树种组成、年龄、立地条件及人为干扰的影响。其中，人为干扰影响最大，几乎使枯落物损失殆尽。森林枯落物营养元素总贮量０．１７６－１．５３４ｔ／ｈｍ＾２，最大贮水量３．９－５

Studies on the Litters in the Forest and Shrub Communities in the Eastern Yanshan Mountains

The average amount of the present remaining litter in the forest community of the Eastern Yanshan Mountain is 4.35~28.67t/ha, with the greatest amount in the mixed forests of aspen (Populus davidiana Dode) with other broadleaf trees, the mixed forests of Chinese pine (Pinus tablaeformis Carr.) with oak, and the mixed forests of linden with other broadleaf trees; with the greater amount in the oak (Quercus variabilis B1., Q. liaotungensis Koidz., Q. dentata Thunb.) and Chinese arborvitae (Platy-cladus orientalis (L.) Endl.) forests. The average amount of the present remaining litters in the shrub community is 4.15~18.94t/ha, smaller than that in the forest community. The amount of the present remaining litters in the forests is determined by the composition of tree species, age of the forests, site condition and human interferences. Human interferences have brought about almost a complete loss of the litters. The total amount of the nutrient elements in the forest litters is 0.176~1.534 t/ha, and the maximum water content in the forest litter is 3.9-54.0 t/ha, averaging 41.2 t/ha. The total amount of the nutrient elements in the shrub litter is 0.327-0.846 t/ha, and the maximum water content in the shrub litter is 4.8-26.9 t/ha, averaging 16.2t/ha.