其他摘要 | The research measured the carbon (C), nitrogen (N), phosphorus (P) content of plant
leaf, root and soil at different slope aspects (sunny slope & shady slope) and different slope
positions (top, upper, middle and lower) at Ansai Experiment Station. The effects of microtopography
on stoichiometric characteristics of plants and soil in the hilly Loess Plateau region
were revealed. The results showed that the average leaf C, N and P contents were 433.47, 24.84
and 1.61 g/kg respectively, the leaf C/N, C/P and N/P stoichiometric ratios were 18.18, 320.36
and 17.41 respectively. The value of leaf N/P showed that the growth of plants was restricted
by P in hilly Loess Plateau region. The root C, N and P contents were 380.05, 9.07 and 0.31 g/
kg respectively, and the stoichiometric ratios of root C/N, C/P and N/P were 49.61, 1 326.64
and 30.73 respectively. Leaf and root C, N and P contents in shady slope were all greater than
those in sunny slope, and those in top slope were the least. In shady slope, the C, N and P
contents of leaf and root in different positions were in the order of lower slope > middle slope >upper slope > top slope. Soil C, N and P contents at different slope aspects were in the order of
shady slope > sunny slope > top slope. Soil C, N and P contents concentrated in the 0-20 cm
soil layer and decreased with soil depth. As the different part of biogeochemical cycle, plant
and soil must have the contact. Correlation analysis showed that soil nutrients at different soil
layers were correlated with the stoichiometric characteristics of leaf and root. Especially, the
soil C, N and P contents at 0-20 cm layer had significantly positive correlation with leaf C, N
and P contents (P<0.05), and also had significantly positive correlation with root N and P
content (P<0.05), but had no significant correlation with root C content. |
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