摘要
在新疆天山巴音布鲁克高寒草地,应用双向指示种分类法(Twinspan)、典范对应分析(CCA)和除趋势对应分析(DCA)方法研究了环境因子对群落分布和物种组成的影响。结果表明:1)高寒草原分布在2460-2760m的低海拔区域,该区域7、8月温度较高,为10.8℃;高寒草原化草甸分布在2860m左右;高寒草甸分布在2960m以上,该区域7、8月相对湿度和土壤含水量较高,分别为77.77%和42.95%。2)随海拔升高,高寒草原、高寒草原化草甸和高寒草甸的速效K含量逐渐减少,有机质和速效N逐渐增加。3)CCA、DCA分析表明,温度、速效K和有机质因子对该地区群落分布和物种组成有重要影响。4)Twispan分类将9个样地划分为高寒草原、高寒草原化草甸和高寒草甸3个类型,与CCA和DCA分析的结果基本吻合。
In order to analyze the influence of environmental factors on distribution of plant communities and composition of species in alpine grassland, 9 plots （10m - 10m） were established from west to east, basic 2460m, along an altitude gradients at 100m intervals in Bayinbulak alpine grassland on the southern slope of Tianshan Mountain. Data were analyzed by using the quantitative classification method （Two - way Indicator Species Analysis） and the ordination technique （Canonical Correspondence Analysis and Detrended Canonical Correspondence）. The results showed that： 1 ） Alpine steppe types mainly distributed from 2460 to 2760m, with the average temperature about 10. 8℃ in July and August. Alpine steppe - meadow distributed at altitude of 2860m. Alpine meadow distributed about over altitude of 2960m. The average relative humidity and soil water content were 77.77% and 42.95% respectively in July and August. 2） Available soil potassium content gradually decreased from alpine steppe, alpine steppe - meadow to alpine meadow, but organic matters and available soil nitrogen content gradually increased. 3） CCA and DCA ordination showed that environmental factors, such as temperature, available soil potassium and organic matters played a very important role in the community distribution and species composition. 4） The TWINSPAN cluster analysis also indicated that the nine plots were divided into three types, alpine steppe, alpine steppe - meadow and alpine meadow, and it was completely approved by the result of ordination.
出处
《中国农业气象》
CSCD
2007年第4期378-382,共5页
Chinese Journal of Agrometeorology
基金
中国科学院新疆生态与地理研究所前沿领域项目(20049016)
全球环境基金新疆草地项目(GEF)
关键词
高寒草地
CCA排序
TWINSPAN分类
环境因子
Alpine grassland
CCA ordination
TWINSPAN quantitative classification
Environmental factors
