Ecological stoichiometric characteristics of nitrogen and phosphorus in
leaves, stems and roots of Haloxylon ammodendron in southern
Gurbantunggut Desert and their relationship with soil factors
Abstract
In order to explore the stoichiometric characteristics of nitrogen (N)
and phosphorus (P) of Haloxylon ammodendron on the south edge of
Gurbantungut Desert, and to reveal the adaptability of desert plants to
nutrient utilization in barren habitats, this study took the south edge
of Gurbantungut Desert in Xinjiang as a typical area. The contents of N
and P in leaves, stems and roots of H. ammodendron were measured and
analyzed, and the correlation between the ecological stoichiometry of N
and P in organs and soil factors was discussed, as well as the influence
of the samples and organs. The results showed as follows: (1) There were
significant differences in N content, P content and N:P among different
organs of H. ammodendron, and the trend of each index was roughly the
same. The general trend was higher in leaves, followed by stems and
roots. (2) Correlation analysis showed that N content in all organs of
H. ammodendron was positively correlated with soil total nitrogen. P
content in leaves and roots was significantly positively correlated with
soil total P, while P content in stems was significantly negatively
correlated with soil total P. P content in all organs was negatively
correlated with soil N:P. The contents of N, P and N:P in different
organs were negatively correlated with soil pH and electrical
conductivity. (3) General linear model analysis showed that organs had
great influence on N content, P content and N:P of H. ammodendron.