摘要
为探讨马尾松套种阔叶树的林相改造后林下植被的变化规律,在马尾松林分中间伐套种不同阔叶树种,对套种20 a后的林分林下植被进行全面调查。结果表明:套种20 a后,没有套种的马尾松林分林下基本上保持原有的以芒萁和竹类为主的植被,而有套种3种阔叶树的林分林下植被变化较大,原有的植被基本消失,取代的则是较耐荫的1、2年生草本植物及蕨类。套种20 a后,马尾松林分林下植被种数增加,林下植被生物量大大减少。抚育对马尾松林分林下植被有较大的影响,套种3种阔叶树林分经过抚育后其林下植被芒萁和竹类新出的株数均显著高于没有抚育的林分,有抚育的林分新出的芒萁和竹类株数随着时间的推移呈现出下降的趋势。马尾松套种阔叶树林分的下层林冠对林下植被有较大影响,套种后6~8 a,套种3种阔叶树林分林下芒萁和竹类新出的株数均显著低于没有套种的林分,有套种的林分芒萁和竹类新出的株数随着时间的推移呈现出下降的趋势。
We studied changes in the understorey vegetation during Pinus massoniana forest transformation. After 20 years of restoration, Pinus massoniana forest stands without interplanting essentially maintained the original vegetation, dominated by ferns and bamboos, while the vegetation under 3 kinds of interplanted broad-leaved trees showed considerable changes. The original vegetation, which was dominated by Dicranopteris dichotoma and bamboo, was largely lost, replaced by more shade-tolerant species and annual or biennial herbs and ferns. After 20 years of interplanting, the number of understorey species increased, the biomass of understorey vegetation was significantly lower in interplanted stands. Tending had a significant influence on the main understorey vegetation, Dicranopteris dichotoma and bamboo, in the Pinus massoniana stand interplanted with 3 broad-leaved tree species, the number of new plants was significantly higher after tending than in stands without tending, in tended forest stands, the number of Dicranopteris dichotoma plants showed a downward trend over time. Interplanting with broad-leaved trees had a significant influence on the understorey vegetation. After 6 to 8 years, the number of new bamboos and rayons of Pinus massoniana stands interplanted with broad-leaved tree species were significantly lower than that of stands with no interplanting, the number of new plants in the intercropping stands tended to decrease over time.
引文
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