摘要
从生物多样性和林分环境的角度,探讨带状改造对柏木人工林的影响,分析不同带宽改造对林下植被生物多样性和空气温度、土壤温度的影响。结果表明:不同带宽改造对林下植被生物多样性的影响是不同的。6 m带宽改造后仅灌木层的Simpson指数D、Shannon-Wiener指数H有所增加,而灌木层物种丰富度S、草本层的D、H、S均没有显著影响;20 m带宽改造后,草本层D、H、S均有提高,而灌木层则影响不显著。在物种组成上20 m带宽改造没有变化,但重要值发生了变化,6 m改造带灌木层由鼠李科的马甲子取代了未改带的蔷薇科的优势种地位,灌木层多样性则因带宽不同而表现出不同的效果,带状改造宽度的不同,对林下植被的生活环境影响存在差异,使阳生、喜暖植物的比例增加,覆盖地表的草本植物由以单子叶为第一优势种逐渐过渡到以双子叶植物为第一优势种。不同带宽改造对林分小气候产生了不同的影响。6 m带宽的土壤温度差要比20 m的低,6 m带宽改造后空气温度差高于20 m带宽改造。
The effects of strip reform on cypress plantation were analysed in the view of biodiversity and forest stand environment including index of biodiversity of undergrowth vegetation species, air temperature in stands, soil temperature of different strip width treats. The result showed that： reform of different strip widths had different effects on under growth biodiversity. For 6 m width strip reform, only indexes of D,H from shrub layer increased and there was no significant effect on S and D,H,S of herb layer. The species composition was not significantly changed after 20 m width strip reform except the change in the importance value. Mbawmagyabceij of Rhamnaceae replaced Rosaceae plants and became the dominant species in 6 m width strip reform in the shrub layer identically, and the biology diversity of shrub layer was different with different strip widths. Monocotyledon was replaced by dicotyledon gradually as the dominant species owing to the increase of the sun plants, which resulted from the change in the forest stand environment. Reform of different strip widths had different effects on air temperature and soil temperature. The soil temperature variance in the 6 m strip was lower than in the 20 m width strip and the air temperature variance in the 6 m width strip was higher than in the 20 m width strip.
出处
《江西农业大学学报》
CAS
CSCD
北大核心
2009年第3期381-387,共7页
Acta Agriculturae Universitatis Jiangxiensis
基金
林业科技支撑计划(2006BA003A1303)
林业科技支撑计划资助(2006BA003A0701)
中国林业科学研究院公益基金资助(CAFYBB2007010)
关键词
带状改造
柏木人工林
生物多样性
林分环境
strip reform
cypress plantation
biology diversity
forest stand environment
