摘要
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。
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.
出处
《西北林学院学报》
CSCD
1996年第4期7-11,共5页
Journal of Northwest Forestry University
关键词
森林类型
枯落物
持水性能
养分含量
forest type
litter
water holding behaviour
nutrient content
