间伐强度对柏木低效人工林灌草多样性的影响

Effects of Different Thinning Intensity on the Understory Diversity within Cupressus funebris Low-efficiency Plantation

研究了弱度(15%)、中度(25%)、强度(35%)、极强度(50%)和CK(0%)5种间伐强度对德阳市旌阳区33年生柏木(Cupressus funebris)低效人工林灌草生长及其生物多样性的影响。结果表明:间伐1 a后,不同间伐强度下的林下植物种类、密度和生物量均有所增加;林下灌木层和草本层物种的丰富度指数、Shannon-Wiener指数和Simpson优势度指数均随着间伐强度的增大而增大,其中,强度和极强度间伐增加最显著(P<0.05)。从短期的影响效果看,强度和极强度间伐有利于柏木低效人工林灌草多样性的提高。

By 1-a in situ simulated experiment, we examined the short-term effect of 15% （T1）, 25% （T2）, 35% （T3）, 50% （T4） and 0 （CK） thinning on the understory （ shrub and herb） diversities of 33-a low-efficiency Cupressusfunebris planta- tion, located in Jingyang District of Deyang City, Sichuan Province. One year later, the species richness, density, biomass of understory increased slightly in all treatments. The species richness, Shannon-Wiener index, Simpson dominance index of shrnb-and herb-layer were increased with thinning intensity, and the significant positive effects on diversity existed in T3 and T4. Hence, the intense thinning could facilitate to increase the diversity of shrubs and herbs within low-efficiency C. funebris plantation.