埋藏条件下3种干旱荒漠植物的种子休眠释放和土壤种子库

doi:10.3724/SP.J.1258.2012.00774

摘要/Abstract

摘要：

对种子休眠的自然释放及其作用因素的研究, 是了解种子休眠生态学、种群适应机制的重要途径。以内蒙古阿拉善干旱荒漠区的3种主要植物牛枝子(Lespedeza potaninii)、唐古特白刺(Nitraria tangutorum)和骆驼蒿(Peganum nigellastrum)为材料, 研究了种子在野外埋藏18个月期间和4个埋深条件下的休眠释放特性和土壤种子库。3种植物种子在野外埋藏时(采收后5 ℃冷藏6个月)的休眠率分别为98%、95%和3%。结果显示, 埋藏过程中, 3种植物种子的休眠释放表现出不同的变化特性。对牛枝子而言, 置于地表(0 cm)的种子比埋藏于土中的种子的休眠释放快, 埋藏期末, 埋深0、2、5和10 cm的种子的休眠率分别为64%、87%、86%和82%。唐古特白刺种子埋藏6个月后, 各埋深的休眠已完全释放, 释放速率随埋深增加而加快。骆驼蒿种子具有典型的季节性休眠循环特性, 休眠率各年度最高点出现在10月份, 释放速率随埋深增加呈减慢趋势。埋藏期末不同埋深条件下, 牛枝子、唐古特白刺和骆驼蒿种子的平均田间萌发率分别为11%、12%和8%; 平均室内萌发率分别为3%、74%和42%; 而平均死种子率分别为3%、15%和10%。根据Thompson和Grime (1979)的土壤种子库分类体系, 供试的3种植物都属于持久土壤种子库类型。

关键词: 萌发, 牛枝子, 唐古特白刺, 骆驼蒿, 休眠释放, 埋藏, 土壤种子库

Abstract:

Aims Our objective was to study the effects of depth and duration of seed burial in the field on seed dormancy release and soil seed bank dynamics of three desert plants.
Methods The field burial experiment was conducted during an 18-month period at the site of the original seed collection at Alax Desert of Nei Mongol, China during April 2008 to October 2009. The species included Lespedeza potaninii, Nitraria tangutorum and Peganum nigellastrum with the dormancy of 98%, 95% and 3%, respectively, at the beginning of burial (stored 6 months at 5 °C since harvested). Four burial depths were used: 0, 2, 5 and 10 cm.
Important findings Dormancy release patterns were different among the three species. The dormancy percentage of L. potaninii seeds decreased from 98% at date of burial to 64% after 18-month burial on the soil surface (0 cm); lower decreases were observed when buried at 2, 5 and 10 cm (82% to 87%). Dormancy in N. tangutorum dropped from 95% to 1% after 6-month burial in the field. In contrast to these species, P. nigellastrum seeds exhibited seasonal pattern (dormancy cycle) during the experimental period. The maximum points of dormancy were observed in October in each of the two years, decreasing thereafter with dormancy of 3% when buried. The speed of dormancy release increased in N. tangutorum as the soil burial depth increased, but decreased in P. nigellastrum. At the end of 18-month burial, the field-germinated seeds on average of different buried depths were 11%, 12% and 8% for L. potaninii, N. tangutorum and P. nigellastrum, respectively; the average laboratory germinations were 3%, 74% and 42%, and dead seeds averaged 3%, 15% and 10%, respectively. According to the soil seed bank classification proposed by Thompson and Grime (1979), L. potaninii, N. tangutorum and P. nigellastrum had persistent seed banks.

Key words: germination, Lespedeza potanimii, Nitraria tangutorum, Pegamum nigellastrum, seed dormancy release, soil burial, soil seed bank

王彦荣, 杨磊, 胡小文. 埋藏条件下3种干旱荒漠植物的种子休眠释放和土壤种子库. 植物生态学报, 2012, 36(8): 774-780. DOI: 10.3724/SP.J.1258.2012.00774

WANG Yan-Rong, YANG Lei, HU Xiao-Wen. Seed dormancy release and soil seed bank of three arid desert plants under burial conditions. Chinese Journal of Plant Ecology, 2012, 36(8): 774-780. DOI: 10.3724/SP.J.1258.2012.00774

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链接本文: https://www.plant-ecology.com/CN/10.3724/SP.J.1258.2012.00774

https://www.plant-ecology.com/CN/Y2012/V36/I8/774

图/表 5

表1 3种植物种子的发芽测定方法

Table 1 Germination test method of three plant seeds

植物 Plant	温度 Temperature (℃)	发芽天数 Germination days (d)	方法来源 Reference
牛枝子 Lespedeza potaninii	25	14	China National Bureau of Quanlity and Technical Supervision, 2001
唐古特白刺 Nitraria tangutorum	25/35 (16 h/8 h)	28	Zeng et al., 2010
骆驼蒿 Peganum nigellastrum	25/35 (16 h/8 h)	14	Yang, 2010

图1 不同埋深和埋藏时间对牛枝子种子组分的影响。

Fig. 1 Effects of burial depth and burial time on seed components of Lespedeza potaninii.

图2 不同埋深和埋藏时间对唐古特白刺种子组分的影响。

Fig. 2 Effects of burial depth and burial time on seed components of Nitraria tangutorum.

图3 不同埋深和埋藏时间对骆驼蒿种子组分的影响。

Fig. 3 Effects of burial depth and burial time on seed components of Peganum nigellastrum.

图4 3种荒漠植物土壤种子库动态(平均值±标准偏差)。

Fig. 4 Dynamics of soil seed bank of three desert plants (mean ± SD).

参考文献 23

[1]	Baker KS, Steadman KJ, Plummer JA, Merritt DJ, Dixon KW (2005). The changing window of conditions that promotes germination of two fire ephemerals, Actinotus leucocephalus (Apiaceae) and Tersonia cyathiflora (Gyrostemonaceae). Annals of Botany, 96, 1225-1236. DOI URL
[2]	Baskin CC, Baskin JM (1998). Seeds: Ecology, Biogeography and Evolution of Dormancy, and Germination. Academic Press, San Diego.
[3]	Baskin JM, Baskin CC (2004). A classification system for seed dormancy. Seed Science Research, 14, 1-16.
[4]	Bouwmeester HJ, Karssen CM (1992). The dual role of temperature in the regulation of the seasonal changes in dormancy and germination of seeds of Polygonum persicaria L. Oecologia, 90, 88-94.
[5]	China National Bureau of Quanlity and Technical Supervision (国家质量技术监督局) (2001) Rules for Forage Seed Testing―Germination Test (牧草种子检验规程发芽试验). GB/T2930. 4-2001. China Standard Press, Beijing. 33-50. (in Chinese)
[6]	Fenner M (1995). Ecology of seed banks. In: Kigel J, Galili G eds. Seed Development and Germination. Marcel Dekker, New York. 507-528.
[7]	Holmes PM, Newton RJ (2004). Patterns of seed persistence in South African fynbos. Plant Ecology, 172, 143-158.
[8]	Hu XW, Wu YP, Wang YR (2009). Different requirements for physical dormancy release in two populations of Sophora alopecuroides relation to burial depth. Ecological Research, 24, 1051-1056.
[9]	Huang ZY (黄振英) (2003). Adaptation strategies of seed dormancy and germination of Psammochloa villosa, a sand dune grass inhabiting Ordos Plateau, China. Acta Botanica Boreali-Occidentalia Sinica (西北植物学报), 23, 1128-1133. (in Chinese with English abstract)
[10]	Jansen PI, Ison RL (1994). Temperature effects on germination of Trifolium balansae and Trifolium resupinaturn with special reference to high-temperature dormancy. Australian Journal of Agricultural Research, 45, 689-701.
[11]	Leishman MR, Westoby M (1998). Seed size and shape are not related to persistence in soil in Australia in the same way as in Britain. Functional Ecology, 12, 480-485.
[12]	Li QY (李秋艳), Zhao WZ (赵文智) (2005). Advances in the soil seed bank of arid regions. Advance in Earth Sciences (地球科学进展), 20, 350-358. (in Chinese with English abstract)
[13]	Lloyd DL, Taylor GB, Johnson B, Teasdale KC (1997). Patterns of seed softening and seedling emergence of nineteen annual medics during three years after a single seed crop in southern Queensland. Australian Journal of Experimental Agriculture, 37, 767-778.
[14]	Louda SV (1989). Predation in the dynamics of seed regeneration. In: Leck MA, Parker VT, Simpson RL eds. Ecology of Soil Seed Banks. Academic Press, San Diego. 25-52.
[15]	Morrison DA, McClay K, Porter C, Rish S (1998). The role of the lens in controlling heat-induced breakdown of testa- imposed dormancy in native Australian legumes. Annals of Botany, 82, 35-40.
[16]	Taylor GB, Ewing MA (1988). Effect of depth of burial on the longevity of hard seeds of subterranean clover and annual medics. Australian Journal of Experimental Agriculture, 28, 77-81.
[17]	Taylorson RB (1970). Changes in dormancy and viability of weed seeds in soils. Weed Science, 18, 265-269.
[18]	Thompson K, Ceriani RM, Bakker JP, Bekker RM (2003). Are seed dormancy and persistence in soil related? Seed Science Research, 13, 97-100.
[19]	Thompson K, Grime JP (1979). Seasonal variation in the seed banks of herbaceous species in ten contrasting habitats. Journal of Ecology, 67, 893-921.
[20]	Yang L (杨磊) (2010). Natural Release Patterns and Artificial Breaking of Seed Dormancy in 3 Desert Plant Species (三种干旱荒漠植物种子休眠的自然释放及人工破除研究). Master degree dissertation, College of Pastoral and Agricultural Science and Technology, Lanzhou University, Lanzhou. (in Chinese with English abstract)
[21]	Yu SL (于顺利), Jiang GM (蒋高明) (2003). The research development of soil seed bank and several hot topics. Acta Phytoecologica Sinica (植物生态学报), 27, 552-560. (in Chinese with English abstract)
[22]	Zeng YJ, Wang YR (2009). Methods of topographical tetrazolium testing for seed viability of Nitraria tangutorum Bobr. and N. sibirica Pall. Seed Science and Technology, 37, 691-698.
[23]	Zeng YJ, Wang YR, Zhang J, Li ZB (2010). Germination responses to temperature and dormancy breaking treatments in Nitraria tangutorum Bobr. and Nitraria sibirica Pall. Seed Science and Technology, 38, 537-550.