北京西山地区人工油松栓皮栎混交林根系研究初报

对油松栓皮栎混交林,油松纯林和栓皮栎纯林三种林分的根系形态、分布和生物量分别进行了调查。研究结果表明:1.栓皮栎纯林、混交林、油松纯林的细根(<2毫米)量和粗根(2—10毫米)量分别为:2440.18公斤/公顷和3897.11公斤/公顷;1861.65公斤/公顷和3323.87公斤/公顷;1441.98公斤/公顷和1767.93公斤/公顷。2.在混交林中,栓皮栎平均单株细根量和粗根量均大于纯林栓皮栎,而油松平均单株细根量和粗根量小于纯林油松。3.在混交林中,各树种的根系分布合理,没有观察到两种林木根系间有排斥现象。

A PRELIMNARY STUDY ON ROOT SYSTEMS OF THE ARTIFICIALLY MIXED STAND OF PINUS TABULAEFORMIS AND QUERCUS VARIBILIS IN XISHAN REGION, BEIJING

The root systems of pine-oak mixed stand, pure pine stand and pure oak stand were investigated in respect of their morphology, distribution and biomass. The results showed. 1. The fine-root (<2 mm in diameter) biomass and thick-root (2-10mm in diameter) biomass were 2440.18kg/ha and 3897.11kg/ha in a 27 years old pure oak stand, 1441.98kg/ha and 1767.93kg/ha in a 28 years old pure pine stand and 1861.65kg/ha and 3323.87kg/ha in the mixed stand of the same age respectively. 2. In the mixed stand both fine and thick root biomasses per oak tree were higher than those in the pure oak stand, and both fine and thick root biomasses per pine tree were lower than those in the pure pine stand. 3. In the mixed stand the distribution of root systems is reasonable and no repe llency between pine roots and oak roots was obserred in the soil.