关键词: 地膜覆盖, 温室气体排放强度, 净温室效应

Abstract: Ecological stoichiometry theory states that the elements and their ratios in organisms not only determine the key features of the organisms, but also determine the resource amounts and types that organisms demand. In this paper, photosynthetic organs of 20 plant species were selected in Ebinur Lake Wetland Nature Reserve, and their characteristics of carbon, nitrogen and phosphorus stoichiometry were analyzed. The results showed that C, N, and P concentrations in photosynthetic organs ranged from 209.48 to 728.18 mg·g^-1 (with an average of 429.60±99.05) mg·g^-1, 11.23 to 42.57 mg·g^-1 (with an average of 20.52±5.78) mg·g^-1, and 0.39 to 3.50 mg·g^-1 (with an average of 0.93±0.42) mg·g^-1, respectively. The C∶N, C∶P and N∶P ratios were 22.74±8.88, 512.93±186.53, 25.64±16.74, respectively. From the point of view of plant life forms, shrubs and herbaceous plants had a lower storage capacity for C than trees, while there was no significant difference in P concentration among the three life forms. In terms of plant functional types, C, N, P, C∶N, C∶P, N∶P of assimilating branches were not significantly different from those of leaves. Comparing the results of this research with the global and Chinese scales found that plants in Ebinur Nature Reserve had lower P concentration, higher N∶P and C∶P, indicating shortages of N and P, especially P in plants studied.

Key words: greenhouse gas intensity, plastic film mulching., net global warming potential