引用本文: 谈笑，陈莉，龙玲，王明明，李春鸣. 天祝地区高寒草甸珠芽蓼草地土壤种子库季节动态与空间分布特征. 草业科学, 2019, 36(10): 2485-2491. doi: shu

Citation: TAN X, CHEN L, LONG L, WANG M M, LI C M. Seasonal dynamics and characteristics of the spatial distribution of a soil seed bank of a meadow in an alpine area in the Tianzhu Region. Pratacultural Science, 2019, 36(10): 2485-2491. doi: shu

天祝地区高寒草甸珠芽蓼草地土壤种子库季节动态与空间分布特征

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xibeiminzudaxueshengmingkexueyugongchengxueyuan，gansu lanzhou 730030

作者简介: 谈笑(1987-)，女，甘肃兰州人，实验师，硕士，主要从事分子营养研究。E-mail: ;

通讯作者: 李春鸣,

基金项目:BG视讯国家自然科学基金(31960279、31560323、31360533、31560120)；中央高校基本科研业务费专项资金(31920180133、1001050128)

摘要: 通过野外调查和种子萌发法分析了天祝地区高寒草甸珠芽蓼(Polygonum viviparum)草地土壤种子库季节动态和空间分布特征。结果表明，在返青期取样的种子库中，平均单位体积(长1.0 m × 宽1.0 m × 高0.1 m)有种子3 479 粒，在枯黄期取样的种子库中，有种子3 871 粒，在枯黄期取样的种子库总体数量多于在返青期取样的种子库数量，但差异不显著(P > 0.05)；无论是返青期还是枯黄期，土壤种子密度在0 – 5 cm土层均高于5 – 10 cm土层，且二者差异显著(P < 0.05)，不同取样时间同一土层种子密度差异不显著(P > 0.05)；土壤种子库物种丰富度、辛普森多样性指数、香农指数、均匀度指数均为返青期样品高于枯黄期样品，除了物种丰富度两者之间差异达到显著水平(P < 0.05)外，辛普森多样性指数、香农指数、均匀度指数均为不显著(P > 0.05)；返青期样品由地面芽植物、地下芽植物和一年生植物3种植物生活型构成，枯黄期样品由地面芽植物和地下芽植物2种植物生活型构成；珠芽蓼草地土壤种子库与地上植被的物种组成相似性较低，返青期样品的Jaccard相似性指数和Sørenson相似性指数低于枯黄期样品。

关键词:

English

Seasonal dynamics and characteristics of the spatial distribution of a soil seed bank of a Polygonum viviparum meadow in an alpine area in the Tianzhu Region

college of science and engineering, northwest minzu university, lanzhou 730030, gansu, china

Corresponding author: Chunming LI,

Received Date: 2019-01-21
Available Online: 2019-10-01

Abstract: The seasonal dynamics and characteristics of the spatial distribution of a soil seed bank of a Polygonum viviparum meadow in an alpine area in the Tianzhu region were studied through a field investigation and seed germination tests. The results indicated that for the soil seed bank during the turning green period, the density of average unit volume (length 1.0 m × width 1.0 m × height 0.1 m) is 3 479; whilst during the yellowing period,the density of average unit volume (1.0 m × 1.0 m × 0.1 m) was 3 871. The total numbers for the soil seed bank in the yellowing period were higher than in the turning green period, with a significant difference at the 0.05 level. The soil seed density at 0 – 5 cm was significantly higher than that at 5 – 10 cm in both the turning green and yellowing periods, with a significant differences (P < 0.05). However, there were no significant differences in the same soil seed density at different sampling times. The richness, simpson, shannon-wiener, and evenness indexes of the soil seed bank in the turning green period were all higher than those in the yellowing periods, except for, richness. The difference between the simpson, shannon-wiener, and evenness indexes was not significant. The difference between the richness was at the 0.05 level; The characteristics of the life forms present in a Polygonum viviparum meadow in the soil seed bank was: the sample from the turning green period was made up of Hemicryptophytes, Cryptophytes and Therophytes, whilst sample from the yellowing periods was made up of Hemicryptophytes and Cryptophytes; The similarity of the species composition between the soil seed bank and aboveground vegetation of a Polygonum viviparum meadow in an alpine area in Tianzhu was low, The jaccard similarity index and Sørenson similarity index of the turning green period was lower than those of the yellowing periods.

Key words:

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表 1 珠芽蓼草地土壤种子库物种组成

Table 1. Species composition of the seed bank of a Polygonum viviparum meadow

seed·m^–2
物种 Species	返青期种子数 No. of seeds in the turning green period	枯黄期种子数 No. of seeds in the yellowing periods
高山紫菀 Aster alpinus	212.23 ± 145.16	–
珠芽蓼 Polygonum viviparum	530.34 ± 178.10	1 589.06 ± 260.26
蓝翠雀花 Delphinium caeruleum	424.12 ± 203.75	474.54 ± 182.52
异针茅 Stipa aliena	353.90 ± 156.21	253.64 ± 178.10
二裂委陵菜 Potentilla bifurca	283.78 ± 100.35	126.32 ± 41.55
高原毛茛 Ranunculus tanguticus	424.66 ± 115.57	353.08 ± 81.73
黄花棘豆 Oxytropis ochrocephala	143.93 ± 54.55	86.67 ± 33.23
矮嵩草 Kobresia humilis	489.56 ± 124.65	356.89 ± 67.87
波伐早熟禾 Poa poophagorum	123.25 ± 31.72	245.08 ± 67.89
扁蓿豆 Trigohella ruthenica	245.67± 98.76	389.91 ± 107.65
银莲花 Anemone cathayensis	108.11 ± 34.55	–
灰绿藜 Chenopodium glaucum	145.45 ± 99.87	–
合计 Total	3 479.72 ± 1 764.95	3 871.49 ± 1 846.58

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表 2 BG视讯不同采样时间土壤种子库密度垂直分布

Table 2. Vertical distribution of the soil seed bank density during the different sampling times

seed·m^–2
采样时间 Sampling time	土层 Soil layer
采样时间 Sampling time	0 – 5 cm	5 – 10 cm
返青期 Turning green period	2 183.12 ± 1 002.63a	1 296.69 ± 1 527.02b
枯黄期 Yellowing period	2 465.37 ± 834.56a	1 406.93 ± 765.59b
同行不同小写字母表示不同土层间差异显著(P < 0.05)。　Different lowercase letters within the same row indicate significant difference between different soil layers at the 0.05 level.

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表 3 土壤种子库α多样性

Table 3. α diversity in the soil seed bank

指标 Parameter	返青期 Turning green period		枯黄期 Yellowing period
指标 Parameter	平均值 Mean	变异系数 CV	平均值 Mean	变异系数 CV
丰富度 Richness	5.75 ± 0.48a	0.17	4.00 ± 0.41b	0.21
均匀度指数 Evenness	0.94 ± 0.03a	0.05	0.80 ± 0.11a	0.26
辛普森指数 Simpson	0.78 ± 0.03a	0.08	0.64 ± 0.06a	0.17
香农指数 Shannon-Wiener	0.70 ± 0.03a	0.07	0.47 ± 0.04a	0.17
同行不同小写字母不同表示返青期和枯黄期之间差异显著(P < 0.05)。　Different lowercase letters within the same row indicate significant difference at the 0.05 level.

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表 4 BG视讯土壤种子库生活型及物种数和种子数量

Table 4. Life forms and species richness and seed number in the soil seed bank

时期 Period	生活型 Life form	物种数 Species number	种子数 Seed number/ (seed·m^–2)
返青 Turning green period	H	5	1 521.76 ± 226.58
	C	4	813.34 ± 318.47
	T	1	70.77 ± 70.77
枯黄期 Yellowing periods	H	3	2 335.69 ± 1 094.10
枯黄期 Yellowing periods	C	3	601.06 ± 247.70
H，地面芽植物；C，地下芽植物；T，一年生植物。　H, Hemicryptophytes; C, Cryptophytes; T, Therophytes.

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表 5 土壤种子库与地上植被相似性

Table 5. Similarity between the seed bank and standing vegetation

相似性指数 Similarity index	返青期 Turning green period	枯黄期 Yellowing period
C_j	0.117 6	0.235 3
C_s	0.210 5	0.381 0
C_j为Jaccard相似性指数，C_s 为Sørenson相似性指数。　C_j is jaccard similarity index, C_s is sørenson similarity index.

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BG视讯

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通讯作者: 陈斌,

1.
shenyanghuagongdaxuecailiaokexueyugongchengxueyuan shenyang 110142

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天祝地区高寒草甸珠芽蓼草地土壤种子库季节动态与空间分布特征

作者简介: 谈笑(1987-)，女，甘肃兰州人，实验师，硕士，主要从事分子营养研究。E-mail: ;

通讯作者: 李春鸣,

English

Seasonal dynamics and characteristics of the spatial distribution of a soil seed bank of a Polygonum viviparum meadow in an alpine area in the Tianzhu Region

Corresponding author: Chunming LI,

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通讯作者: 陈斌,