桥山主要森林类型枯落物持水性能及养分含量测定初报

在麻栎、油松、及其混交林中，通过典型样地调查，测定了枯落物的生物量、持水性能和养分元素含量。结果是：天然林各类型枯落物生物量在１０．２２～１３．８９ｔ／ｈｍ２之间，差异甚小；油松人工林最高，为２３．６７ｔ／ｈｍ２。净拦蓄量以麻栎林最高，为３０．６２ｔ／ｈｍ２；松栎混交林次之，为２０．７３ｔ／ｈｍ２；择伐油松林最低，为１３．７７ｔ／ｈｍ２。择伐可使油松林枯落物生物量减少约４１％，净拦蓄量降低约２２％。不同森林类型的枯落物中，养分元素总贮量有很大差异。以松栎混交林最高，为５３２．９２ｋｇ／ｈｍ２；麻栎林次之，为４３４．３１ｋｇ／ｈｍ２；油松林最低，为３８３．８０ｋｇ／ｈｍ２。但各养分元素含量具有很大的一致性，皆为：Ｃａ＞Ｎ＞Ｋ＞Ｍｇ＞Ｐ

Water Holding Behaviour and Nutrients Content of Litters in Some Major Forest Types in the Qiaoshan Mountain

Biomass, water holding behaviour and nutrients content of litters in forests Quercus acutissima, Pinus tabulaeformis and Pinus tabulaeformis Quercus acutissima were measured based on sampling plots survey. Litter biomass in natural forests was in the range of 10.22 to 13.89t/hm 2 with no significant difference among different forest types. The artificial Pinus tabulaeformis forest had the highest litter biomass of 23.67 t/hm 2. For net water retaining capacity of litters, Quercus acutissima forest had the highest rate of 30.62t/hm 2, followed by Pinus tabulaeformis Quercus acutissima mixture forest of 20.73t/hm 2, the selective cutted Pinus tabulaeformis forest was the last at a rate of 13.77t/hm 2. Selective cutting could lead about 41% decline in litter biomass and 22% in net water retaining capacity. There was a marked variation of nutrients stock in litters among different forest types. The highest value, 532.92kg/hm 2, was found in Pinus tabulaeformis Quercus acutissima forest, the second, 434.31kg/hm 2, was in Quercus acutissima forest, and Pinus tabulaeformis forest got the lowest value of 383.80kg/hm 2. The rank of individual nutrients content in litters in the order of Ca>N>K>Mg>P was the same for all forest types.