高寒草甸群落调查最小样方面积和最小样方数研究

Study on minimum sample area and minimum samplenumber in alpine meadow community survey

摘要:

通过对祁连山东段高寒草甸地上生物量和物种数的研究,确定调查的最小样方面积和最小样方数,为研究高寒草甸群落特征建立一个可靠的监测方法。结果表明:当样方面积为1、2、4、6和8 m²,样方数分别为7.12、8.26、5.02、7.38和16.96时可以获得生物量抽样总体平均值,鉴于试验的有效性,以样方面积为1 m²、样方数为7作为生物量取样的最小面积和样方数。在物种数监测时,要抽样到该群落50%以上的物种,样方面积应该在0.68~1.08 m²,要抽样到70%,80%,95%以上的物种分别要求样方面积为1.00~1.04,2.73~4.84,7.09~20.01 m²。相关分析得出,在小尺度范围内的地上生物量与生长高度之间呈极显著相关性,与物种数之间呈显著相关,而与盖度之间无相关性。

Abstract:

Based on the study of aboveground biomass and species richness of alpine meadow in the Eastern Qilian Mountains,the minimum sample area and minimum sample numbers were determined to establish a reliable monitoring method for accurate monitoring and research of alpine meadow community characteristics.The results showed that when the sample area was 1,2,4,6,and 8 m2,and the number of sample squares was 7.12,8.26,5.02,7.38 and 16.96,respectively,the total mean value of biomass sampling could be obtained.In view of the effectiveness of the test,the sample area was 1 m2 and the sample number was 7 as the minimum area and sample number for biomass sampling.In species number monitoring,to sample more than 50% of the species in the community,the sample area should be 0.68 to 1.08 m2;to sample 70%,80%,and 95% of the species in the community,requiring the sample area to be 1.00 to 1.04,2.73 to 4.84,and 7.09 to 20.01 m2,respectively.Correlation analysis shows that in a small scale,aboveground biomass was extremely significantly correlated with growth height,and significantly correlated with species numbers,and not correlated with coverage.correlation with coverage.