金川泥炭地两个尺度下苔藓植物间及其与维管植物间的种间关系分析

Interspecific Correlations among Bryophytes and among Bryophytes and Vascular Plants in Two Scales in Jinchuan Peatland

在金川泥炭地设置1 m×1 m和25 cm×25 cm两个尺度的大、小样方进行植被调查,并利用方差比率法、X2检验、Pearson相关分析和Spearman秩相关分析方法,定量分析了9种苔藓植物和30种主要维管植物间的种间关系。偏叶泥炭藓、大泥炭藓和尖叶泥炭藓3种优势苔藓植物彼此呈显著负关联,占领着各自不同的生境;该3种优势苔藓植物同伴生苔藓及维管植物主要呈正相关,形成独特的群落,据此划分出4个生态种组。Spearman秩相关分析表明,大样方741个种对中,正联结种对数占49.53%,明显大于小样方666个种对中的41.14%。样方大小对分析植物个体大小差异悬殊的泥炭地植物群落的种间联结的影响巨大。苔藓与维管植物间以及苔藓植物间的种间联结甚至种间关系应在大、小样方中分别探讨更合适。

Two quadrat scales,1 m ×1 m and 25 cm ×25 cm,were established to investigate the vegetation of the Jinchuan Peatland. Interspecific correlations among 9 bryophytes and 30 main vascular plants were analyzed by X2-test, Pearson correlation,and Spearman rank corre- lation quantitatively. There were significantly negative associations among three main peat- mosses. Sphagnum subsecundum, S. palustre, and S. capillifolium, each of which occupied different habitats. Accordingly, four ecological species groups were classified. Spearman rank correlation analysis showed that positive association amounted to 49.53% of the 741 species pairs in the large quadrats,and more than 41.14% of the 666 species pairs in the small quad- rats. This study suggests that quadrat size played a crucial role in analyzing interspecific asso- ciations in peatlands,with great disparity in body size of different plant groups. It appears more suitable to analyze interspecific associations among bryophytes and among bryophytes andvascular plants with small and large quadrats, respectively.