广东南澳岛不同森林群落的林窗环境对移植树苗生长的影响

The Influences of Gaps in Different Forest Communities on the Growth of Transplanted Tree Seedlings on N an'ao Island

摘要:

在广东南澳岛四个森林群落内移植了大叶相思(Acaciaauriculaeformis)、尾叶桉(Eucalyptusurophylla)和荷木(Schimasuperba)三种树苗,通过测定群落内林窗和非林窗生境中的叶面积指数、透光率和幼苗的生长高度,观察林窗环境对移植树苗生长的影响。结果表明:林窗的叶面积指数比非林窗的小;林窗的透光率大于非林窗;各群落的叶面积指数和透光率有季节性的变化,变化幅度各不同。三种幼苗在林窗内比非林窗的乔木层下生长快;大叶相思和尾叶桉幼苗在林窗内的高度增长量显著大于非林窗下的,荷木虽也存在差异,但不如前两者显著。这些结果反映了不同生态特性的树种对林窗的反应不同。

Abstract:

Seedlings of Acacia auriculaeformis, Eucalyptus urophylla, and Schima superba were tr ansplanted in canopy gaps and under secondary broadleaved forest, Pinus m assoniana forest, Acacia auriculaeformis forest, a nd Eucalyptus robusta forest on Nan'ao Island, Guangdong Provin ce. Leaf area index (LAI), transmittance, and seedling height were measured. Res ults indicated that LAI was greater under forests than in gaps, and the transmit tance was much higher in gaps. Both LAI and transmittance changed with the seasons． Seedlings ofthe three species grew fasteringapsthan un derforests．Seedling height of Acacia and Eucalyptus in gaps increased more obviously than that of Schima， showing ecological response of species to canopy gap condition.