除杂灌和松土抚育措施对柚木及其林下植被的影响

Effect of Weed Control and Scarification on Plantations of Tectona grandis and Their Undergrowth Vegetation

为了解除杂灌、松土抚育措施对柚木、林下植被的影响及柚木与林下植被的相互作用,笔者于造林后第2年在柚木幼林中布设了除杂灌(全砍与全铲)和松土(松土与不松土)抚育试验。结果表明:不同除杂灌、松土处理措施对柚木生长和林下植被生长影响显著:(1)全砍与全铲除杂灌处理相比,柚木树高、胸径分别减少39.2%和39.5%;林下灌木高度、盖度和干重分别增加32.6%、76.2%和184.0%,草本则分别增加36.8%、5.8%和39.3%;灌木和草本种类分别减少16.7%和50.0%。(2)松土与不松土措施相比,柚木树高、胸径分别提高13.5%和11.0%;对林下灌木及草本的生长也有显著影响,但较除杂灌措施程度小。(3)柚木树高和胸径生长与林下草本盖度存在显著负相关关系。

The paper aims to understand the effect of weed control and scarification on plantations of Tectona grandis and their undergrowth vegetation. A trial of weed control and scarification on a 2-year-old plantationof Tectona grandis was carried out with treatments of weed control by‘totally cutting＇（TC） and‘totallyspuding＇（TS）, and with treatment of land scarification. The results showed that there were significantlydifferent effects on trees growth and their undergrowth by different treatments：（1） comparing with the treatmentof TS, under the treatment of TC, the growth the trees height and DBH decreased by 39.2% and 39.5%,respectively; the average height, coverage and biomass for shrub increased by 32.6%, 76.2% and 184.0%,respectively, and that of herb increased by 36.8%, 5.8% and 39.3%, respectively, but the species ofundergrowth shrub and herb decreased by 16.7% and 50.0%, respectively;（2） under treatment of landscarification, the growth of tree height and DBH increased by 13.5% and 11.0% respectively, and the treatmenteffect on the undergrowth shrub and herb was significant but weaker than that by treatment of weed control;（3）there was significantly negative correlation between the growth of teak tree and the coverage of herb.