松嫩平原盐碱草地土壤酶活性与植物群落特征的关系初探

doi:10.11686/cyxb2018049

摘要/Abstract

摘要： 为探究退化盐碱草地土壤酶活性和植物群落特征间的关系,以松嫩平原盐碱草地为研究对象,对不同生长季土壤酶活性与植物群落特征之间的关系进行了研究。结果表明:在植物生长季内,土壤酶活性与植物群落特征指数的关系不同,表现为多酚氧化酶活性与Shannon 指数显著负相关(P<0.05);过氧化物酶活性与Simpson指数、丰富度指数和Shannon 指数显著负相关(P<0.05、P<0.01);转化酶与碱性磷酸酶活性和Pielou指数显著正相关(P<0.05)。进一步对不同月份土壤酶活性和植物群落特征指数进行逐步回归分析,结果表明,5月过氧化物酶活性与Shannon指数、转化酶与均匀度指数有量化关系,7月碱性磷酸酶活性与Simpson指数和Pielou指数有量化关系,8月多酚氧化酶活性与Simpson指数有量化关系。CCA分析结果表明,在整个生长季内只有多酚氧化酶活性与植物群落特征指数存在相关关系。综合认为,尽管土壤酶活性和植物群落特征在不同生长季内表现出一定的相关或量化关系,但也只有多酚氧化酶活性和各群落特征指数间有对应关系,可以利用其指示退化盐碱草地植物群落特征的变化。

关键词: 土壤酶, 植物群落特征, 盐碱草地, 季节动态

Abstract: The aim of this study was explore the relationship between soil enzyme activity and plant community characteristics in degraded saline?alkali grasslands. Therefore, we conducted a field study to determine relationship between soil enzyme activity and plant community characteristics in different growing seasons in saline?alkali grassland on the Songnen Plain. The relationship between soil enzyme activity and plant community characteristics differed among the different growing seasons. There was a significant negative correlation between polyphenol oxidase activity and Shannon’s index (P<0.05). Peroxidase activity was negatively correlated with Simpson’s index, richness index, and Shannon’s index (P<0.05, P<0.01). Invertase activity was positively correlated with alkaline phosphatase activity and with the Pielou index (P<0.05). Stepwise regression analyses of soil enzyme activity and plant community characteristics indices in different months were conducted. The results showed that there were quantitative relationships between peroxidase activity and Shannon’s index, and between invertase activity and evenness index in May. In July, alkaline phosphatase activity was quantitatively related with Simpson’s index and with the Pielou index. In August, there was a quantitative relationship between polyphenol oxidase activity and Simpson’s index. The results of a canonical correspondence analysis (CCA) showed that only polyphenol oxidase activity was correlated with plant community characteristics during the whole growing season. In general, although soil enzyme activities showed certain correlative or quantitative relationships with plant community characteristics in different growing seasons, the strongest correlation was between polyphenol oxidase activity and the community characteristics index. This relationship can be used to evaluate changes in plant community characteristics of degraded saline?alkali grasslands.

Key words: soil enzyme, plant community characteristic, saline?alkali grassland, seasonal dynamics

苏鑫,卢嫚,冯程程,郭迎岚,岳中辉. 松嫩平原盐碱草地土壤酶活性与植物群落特征的关系初探[J]. 草业学报, 2018, 27(12): 69-78.

SU Xin, LU Man, FENG Cheng?cheng, GUO Ying?lan, YUE Zhong?hui. spatial distribution characteristics of nitrogen and phosphorus in soil on the Gannan Plateau[J]. Acta Prataculturae Sinica, 2018, 27(12): 69-78.

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