spatial distribution characteristics of nitrogen and phosphorus in soil on the Gannan Plateau

doi:10.11686/cyxb2018049

Abstract

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

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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