内陆河湿地芦苇叶功能性状特征及其对土壤环境因子的响应

Abstract

Abstract:

Phragmites australis in Dunhuang West Lake National Nature Reserve was taken as the research object. The undegraded, mild degraded, moderately degraded and severely degraded plots were delimited so as to analyze the functional traits of P. australis leaves and the response to soil environmental factors under the heterogenetic environment conditions. The results showed that: ① The change of functional traits of P. australis leaves was significant under the environmental gradients (P<0.05), the leaf length, width, area and dry weight were decreased with the environmental degradation, and the specific leaf area was increased with the gradient degradation; ② The coevolution of functional traits of P. australis leaves was observed, there were the extremely significant positive correlations among the leaf functional traits including the leaf length, width, area and dry weight (P<0.01), but the significant negative ones among the specific leaf area and the leaf length and dry weight (P<0.05); ③ Leaf length, width, area and dry weight were significantly positively correlated with the moisture content in topsoil (0-30 cm in depth) and middle soil layer (30-60 cm) (P<0.05), and negatively correlated with salt content in these two soil layers (P<0.05). These revealed that the soil moisture content and salt content in topsoil and middle soil layer were the most important driving forces for the functional traits of P. australis leaves. The results of this study are of the important guiding significance for the ecological conservation and restoration in the inland river wetland in arid area.

Key words: Phragmites australis, leaf functional trait, soil environment; inland river wetland

JIAO Liang, GUAN Xue, LIU Xue-rui, DONG Xiao-gang, LI Fang. Functional Traits of Phragmites australis Leaves and Response to Soil Environmental Factors in Inland River Wetland[J].Arid Zone Research, 2020, 37(1): 202-211.

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Functional Traits of Phragmites australis Leaves and Response to Soil Environmental Factors in Inland River Wetland

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