Chin J Plant Ecol ›› 2016, Vol. 40 ›› Issue (2): 165-.DOI: 10.17521/cjpe.2015.0210
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Ju-Ying HUANG1,*(), Hai-Long YU2
Online:
2016-02-10
Published:
2016-03-08
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Ju-Ying HUANG
Ju-Ying HUANG, Hai-Long YU. Responses of growth of four desert species to different N addition levels[J]. Chin J Plant Ecol, 2016, 40(2): 165-.
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Fig. 1 Effects of N addition on plant biomass of the four species (mean ± SE, n = 5). F0, F2.5, F5, F10, F20, and F40 represent N addition level at 0.00, 2.50, 5.00, 10.00, 20.00, and 40.00 g·m-2·a-1, respectively. Different lowercase letters indicate significant differences (p < 0.05) between population biomass within N levels. The same lowercase letters indicate insignificant differences (p > 0.05). A, B and C are data of Lespedeza potaninii in June, July, and August, respectively. D, E and F are data of Cynanchum komarovii in June, July, and August, respectively. G, H and I are data of Stipa capillata in June, July, and August, respectively. J, K and L are data of Agropyron cristatum in June, July, and August, respectively.
Fig. 2 Effects of N addition on the relative growth rate (from June to August) of the four species (mean ± SE, n = 5). F0, F2.5, F5, F10, F20, and F40 represent N addition level at 0.00,2.50,5.00,10.00,20.00, and 40.00 g·m-2·a-1, respectively. Different lowercase letters indicate significant differences (p < 0.05) between relative growth rate among N addition levels. The same lowercase letters indicate insignificant differences (p > 0.05).
指标 Index | 全C浓度 Total C | 全N浓度 Total N | 全P浓度 Total P | C:N | C:P | N:P | |
---|---|---|---|---|---|---|---|
牛枝子 Lespedeza potaninii | 种群生物量 Population biomass | -0.647 | 0.585 | 0.178 | -0.734 | -0.583 | 0.824* |
相对生长速率 Relative growth rate | -0.564 | 0.461 | 0.031 | -0.618 | -0.443 | 0.889* | |
老瓜头 Cynanchum komarovii | 种群生物量 Population biomass | -0.541 | 0.887* | -0.494 | -0.865* | -0.314 | 0.988** |
相对生长速率 Relative growth rate | -0.558 | 0.555 | -0.709 | -0.708 | -0.169 | 0.802* | |
冰草 Agropyron cristatum | 种群生物量 Population biomass | -0.276 | 0.499 | 0.667 | -0.561 | -0.655 | 0.245 |
相对生长速率 Relative growth rate | 0.669 | -0.321 | 0.049 | 0.483 | 0.390 | -0.585 | |
针茅 Stipa capillata | 种群生物量 Population biomass | -0.477 | 0.950** | 0.655 | -0.836* | -0.508 | -0.589 |
相对生长速率 Relative growth rate | -0.869* | 0.288 | 0.691 | -0.686 | -0.920** | -0.426 |
Table 1 Correlation coefficients between the C:N:P ratio of plant leaves and the plant biomass or the relative growth rate from June to August of the four species
指标 Index | 全C浓度 Total C | 全N浓度 Total N | 全P浓度 Total P | C:N | C:P | N:P | |
---|---|---|---|---|---|---|---|
牛枝子 Lespedeza potaninii | 种群生物量 Population biomass | -0.647 | 0.585 | 0.178 | -0.734 | -0.583 | 0.824* |
相对生长速率 Relative growth rate | -0.564 | 0.461 | 0.031 | -0.618 | -0.443 | 0.889* | |
老瓜头 Cynanchum komarovii | 种群生物量 Population biomass | -0.541 | 0.887* | -0.494 | -0.865* | -0.314 | 0.988** |
相对生长速率 Relative growth rate | -0.558 | 0.555 | -0.709 | -0.708 | -0.169 | 0.802* | |
冰草 Agropyron cristatum | 种群生物量 Population biomass | -0.276 | 0.499 | 0.667 | -0.561 | -0.655 | 0.245 |
相对生长速率 Relative growth rate | 0.669 | -0.321 | 0.049 | 0.483 | 0.390 | -0.585 | |
针茅 Stipa capillata | 种群生物量 Population biomass | -0.477 | 0.950** | 0.655 | -0.836* | -0.508 | -0.589 |
相对生长速率 Relative growth rate | -0.869* | 0.288 | 0.691 | -0.686 | -0.920** | -0.426 |
Fig. 5 Relationships between the relative growth rate of the four specie (from June to August) and community N pool, C:N ratio, and N:P ratio (mean ± SE, n = 5).
Fig. 6 Relationships between the population biomass of the four species and soil total N content, C:N ratio and N:P ratio in August (mean ± SE, n = 5).
Fig. 7 Relationships between the relative growth rate of the four species (from June to August) and soil total N content, C:N ratio, and N:P ratio (mean ± SE, n = 5).
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