| Study on plant leaf N∶P stoichiometry features from shady slope to sunny slope gradient |
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| DOI：10.7606/j.issn.1000-7601.2013.03.22 |
| Key Words: plant leaf N∶ P stoichiometry shady slope sunny slope sub-alpine meadow |
| Author Name | Affiliation | | LIU Minxia | Department of Geography, Northwest Nosmal University, Lanzhou, Gansu 730070, China
Education Ministry Key Laboratory of Arid and Grassland Ecology, Lanzhou University, Lanzhou, Gansu 730000, China | | MA Jianzu | Gansu Academy of Agricultural Sciences, Lanzhou, Gansu 730070, China |
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| Abstract: |
| Through the investigation of 18 plant plots at south Gansu Province sub-alpine meadow habitats, this paper aims to study plant leaves N,P content and their stoichiometry characteristics, and combined with the analysis of soil nutrients, to understand relationship between plant leaves N,P content and their stoichiometry characteristics and soil N P content, soil organic carbon, soil water content and soil N:P ratio. The results showed that plant leaf N content at different slopes varied between 4.46 mg·g-1 and 26.59 mg·g-1, with an average of 16.24 mg·g-1; P content was in the range of 0.71~1.98 mg·g-1, with an average of1.37 mg·g-1; N:P ratio ehanged between 6.43 and 17.75, and average was 11.60. The leaf N content and N:P ratio on a different slope gradient had no significant difference(P>0.05), while the leaf P eontent was
significantly different in different habitats. The inter-species differences of leaf N, P content and N:P ratios were significant(P<0.05), while interaction effect between species and habitats on leaf N and P content and N:P ratio was not significant. Based on the evaluation of N:P ratio threshold of limiting
factor, plant growth in this area was affected by N, which also indicates adaptation of plants in that region to their habitat. |
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