植物生态学报 ›› 2016, Vol. 40 ›› Issue (10): 980-990.DOI: 10.17521/cjpe.2016.0141
王晶1,2, 王姗姗1,2, 乔鲜果1,2, 李昂1, 薛建国1, 哈斯木其尔1,2, 张学耀1,2, 黄建辉1,,A;*
出版日期:
2016-10-10
发布日期:
2016-11-02
通讯作者:
黄建辉
基金资助:
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
摘要:
不合理的土地利用方式以及气候变化导致我国草原生态系统普遍退化, 主要表现在土壤养分降低、植被覆盖度减少、生产力下降。外源氮素添加是促进退化草原尽快恢复的一项重要措施, 尤其是对那些退化较为严重的草原。该研究选取内蒙古东乌珠穆沁旗不同退化程度(轻度、中度和重度)的草原群落, 于2014-2015年开展连续两年的氮素添加实验, 设置对照(不添加)、低水平(5.0 g N·m-2·a-1)、中水平(10.0 g N·m-2·a-1)和高水平(20.0 g N·m-2·a-1) 4种氮素添加处理, 探讨退化草原群落生产力在恢复过程中对不同水平氮素添加的响应。结果显示: (1)高、中水平氮素添加显著提高了轻度退化群落的地上生物量, 分别比对照增加了53.1%、51.6%, 氮素各水平添加对中度、重度群落地上生物量无显著影响; (2)高、中水平氮素添加显著提高了轻度退化群落中多年生根茎型禾草地上生物量, 分别比对照增加了45.1%、47.7%, 而多年生杂类草地上生物量分别比对照减少了37.4%、42.1%, 但中度和重度退化群落各功能群生物量的响应不显著; (3)三种水平氮素添加对轻、中、重度退化群落物种丰富度在试验期间均没有显著影响。研究结果表明氮素添加有助于提高轻度退化草原中多年生根茎型禾草的生物量, 进而提高群落的生物量, 但多年生杂类草会被逐渐替代, 导致生物量降低, 可见施氮对草原恢复的影响取决于草原退化 程度。
王晶, 王姗姗, 乔鲜果, 李昂, 薛建国, 哈斯木其尔, 张学耀, 黄建辉. 氮素添加对内蒙古退化草原生产力的短期影响. 植物生态学报, 2016, 40(10): 980-990. DOI: 10.17521/cjpe.2016.0141
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. Chinese Journal of Plant Ecology, 2016, 40(10): 980-990. DOI: 10.17521/cjpe.2016.0141
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 |
表1 未添加氮处理时不同退化群落属性表(平均值±标准误差)
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 |
表2 氮素添加量(CN)、退化程度(T)、处理年限(Y)以及它们的交互作用对群落地上净初级生产力及物种丰富度的线性混合模型分析。其中氮添加量(CN)、退化类型(T)作为固定效应, 处理年限(Y)作为随机效应
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 |
图1 2015年不同浓度氮素处理对不同退化类型中0-10 cm土层土壤铵态氮、土壤硝态氮、土壤含水量的线性混合模型分析(平均值±标准误差)。采用Duncan多重比较进行处理间的差异分析, 相同字母表示处理间差异不显著, 不同字母表示差异显著(p < 0.05)。I、II、III分别表示轻度退化、中度退化、重度退化。
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.
图2 氮素添加对不同退化区年际间地上生物量的影响(平均值±标准误差)。Duncan’s多重比较进行处理间差异分析, 不同字母表示有显著性差异(p < 0.05)。I、II、III分别表示轻度退化、中度退化、重度退化。
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.
图3 2014-2015年氮素添加对不同退化区物种丰富度的线性混合模型分析(平均值±标准误差)。
Fig. 3 Effects of nitrogen addition on plant species richness of the different degraded blocks between 2014 and 2015 (mean ± SE).
图4 氮素添加对不同退化区年际间群落中植物功能群所占比例的影响。I、II、III 分别表示轻度退化、中度退化、重度退化。AB, 一、二年生植物; PB, 多年生丛生型禾草; PF, 多年生杂类草; PR, 多年生根茎型禾草; SS, 灌木及半灌木。
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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