Chin J Plan Ecolo ›› 2016, Vol. 40 ›› Issue (10): 980-990.DOI: 10.17521/cjpe.2016.0141
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Jing WANG1,2, Shan-Shan WANG1,2, Xian-Guo QIAO1,2, Ang LI1, Jian-Guo XUE1, Muqier HASI1,2, Xue-Yao ZHANG1,2, Jian-Hui HUANG1,*
Online:
2016-10-10
Published:
2016-11-02
Contact:
Jian-Hui HUANG
Jing WANG, Shan-Shan WANG, Xian-Guo QIAO, Ang LI, Jian-Guo XUE, Muqier HASI, Xue-Yao ZHANG, Jian-Hui HUANG. Influence of nitrogen addition on the primary production in Nei Mongol degraded grassland[J]. Chin J Plan Ecolo, 2016, 40(10): 980-990.
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轻度退化 Slightly degraded | 中度退化 Moderately degraded | 重度退化 Heavily degraded | |
---|---|---|---|
地上净初级生产力 ANPP (g·m-2) | 190.04 ± 12.45a | 154.02 ± 14.60b | 108.85 ± 6.53c |
物种丰富度 Species richness | 10.36 ± 0.32a | 8.95 ± 0.34b | 7.34 ± 0.34c |
多年生根茎型禾草 PR (%) | 20.08 ± 1.88a | 16.49 ± 2.24b | 10.42 ± 1.75c |
多年生丛生型禾草 PB (%) | 27.13 ± 2.64a | 43.91 ± 3.67b | 37.58 ± 3.5b |
多年生杂类草 PF (%) | 29.92 ± 2.16a | 38.15 ± 2.85b | 52.55 ± 3.5c |
一、二年生植物 AB (%) | 21.59 ± 2.07a | 2.39 ± 0.82b | 2.84 ± 1.03b |
灌木及半灌木 SS (%) | 2.80 ± 0.65ns | 3.34 ± 1.32ns | 5.74 ± 2.29ns |
Table 1 Properties of the degraded community before the N addition treatment (mean ± SE)
轻度退化 Slightly degraded | 中度退化 Moderately degraded | 重度退化 Heavily degraded | |
---|---|---|---|
地上净初级生产力 ANPP (g·m-2) | 190.04 ± 12.45a | 154.02 ± 14.60b | 108.85 ± 6.53c |
物种丰富度 Species richness | 10.36 ± 0.32a | 8.95 ± 0.34b | 7.34 ± 0.34c |
多年生根茎型禾草 PR (%) | 20.08 ± 1.88a | 16.49 ± 2.24b | 10.42 ± 1.75c |
多年生丛生型禾草 PB (%) | 27.13 ± 2.64a | 43.91 ± 3.67b | 37.58 ± 3.5b |
多年生杂类草 PF (%) | 29.92 ± 2.16a | 38.15 ± 2.85b | 52.55 ± 3.5c |
一、二年生植物 AB (%) | 21.59 ± 2.07a | 2.39 ± 0.82b | 2.84 ± 1.03b |
灌木及半灌木 SS (%) | 2.80 ± 0.65ns | 3.34 ± 1.32ns | 5.74 ± 2.29ns |
df | 地上净初级生产力 Aboveground net primary production | 物种丰富度 Species richness | ||||
---|---|---|---|---|---|---|
F | p | F | p | |||
Type (T) | 2 | 18.02 | 0.000 1 | 3.98 | 0.020 5 | |
CN | 3 | 3.17 | 0.026 0 | 1.85 | 0.140 8 | |
Y | 1 | 36.70 | 0.000 1 | 28.91 | 0.000 1 | |
CN × Y | 5 | 3.17 | 0.026 0 | 1.85 | 0.140 9 | |
CN × T | 6 | 0.58 | 0.745 9 | 1.80 | 0.101 2 | |
T × Y | 2 | 10.87 | 0.000 1 | 3.98 | 0.020 5 | |
CN × T × Y | 12 | 0.58 | 0.745 8 | 1.81 | 0.101 1 |
Table 2 Analyses with mixed linear model for species richness and aboveground biomass using treatment (N), type (T) and their interactions as fixed effects, year (Y) as random effect
df | 地上净初级生产力 Aboveground net primary production | 物种丰富度 Species richness | ||||
---|---|---|---|---|---|---|
F | p | F | p | |||
Type (T) | 2 | 18.02 | 0.000 1 | 3.98 | 0.020 5 | |
CN | 3 | 3.17 | 0.026 0 | 1.85 | 0.140 8 | |
Y | 1 | 36.70 | 0.000 1 | 28.91 | 0.000 1 | |
CN × Y | 5 | 3.17 | 0.026 0 | 1.85 | 0.140 9 | |
CN × T | 6 | 0.58 | 0.745 9 | 1.80 | 0.101 2 | |
T × Y | 2 | 10.87 | 0.000 1 | 3.98 | 0.020 5 | |
CN × T × Y | 12 | 0.58 | 0.745 8 | 1.81 | 0.101 1 |
Fig. 1 Seasonal average soil inorganic N (NH4+-N, NO3--N) soil moisture (0-10 cm) in the 2015 from the different degraded communities (means ± SE). Bars with different letters were significantly different (p < 0.05) in Duncan’s multiple range tests reported from the linear mixed model. I, II, and III represents slightly degraded, moderately degraded and heavily degraded community, respectively.
Fig. 2 Effects of nitrogen addition on above ground biomass of the different degraded communities during the three years (mean ± SE). The different letters were significantly different in Duncan’s multiple p < 0.05. I, II, and III represents slightly degraded, moderately degraded and heavily degraded community, respectively.
Fig. 4 Effects of nitrogen addition on relative aboveground biomass of the compositional plant functional groups in the different degraded communities during the three years. I, II, and III represents slightly degraded, moderately degraded and heavily degraded community, respectively. AB, annuals and biennials; PB, perennial bunchgrasses; PF, perennial forbs; PR, perennial rhizome grasses; SS, shrubs and semi-shrubs.
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