[1]田晓萍*,马 力,占玉芳.祁连山祁连圆柏土壤种子库海拔梯度分布格局[J].山地学报,2019,(05):662-668.[doi:10.16089/j.cnki.1008-2786.000457]
 TIAN Xiaoping,MA Li,ZHAN Yufang.Distribution Patterns of Soil Seed Bank of Sabina przewalskii Along Altitudinal Gradient in the Qilian Mountains, China[J].Mountain Research,2019,(05):662-668.[doi:10.16089/j.cnki.1008-2786.000457]
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祁连山祁连圆柏土壤种子库海拔梯度分布格局()
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《山地学报》[ISSN:1008-2186/CN:51-1516]

卷:
期数:
2019年05期
页码:
662-668
栏目:
山地环境
出版日期:
2019-09-30

文章信息/Info

Title:
Distribution Patterns of Soil Seed Bank of Sabina przewalskii Along Altitudinal Gradient in the Qilian Mountains, China
文章编号:
1008-2786-(2019)5-662-07
作者:
田晓萍*马 力占玉芳
张掖市林业科学研究院,甘肃 张掖 734000
Author(s):
TIAN XiaopingMA LiZHAN Yufang
Zhangye Academy of Forestry, Zhangye, Gansu 734000,China
关键词:
祁连圆柏 土壤种子库 分布特征 祁连山
Keywords:
Sabina przewalskii soil seed bank distribution characteristics the Qilian Mountains
分类号:
S718.5~A
DOI:
10.16089/j.cnki.1008-2786.000457
摘要:
为了明确自然条件下祁连圆柏土壤种子库的组成及其垂直空间分布特征,选取祁连山中段(海拔2600~3400 m)的祁连圆柏(Sabina przewalskii)林为研究对象,采用野外采样、室内试验和数据分析相结合的方法,探讨自然条件下祁连圆柏土壤种子库的组成和分布特征。结果表明:(1)祁连山祁连圆柏土壤种子库中饱满种子、空壳种子、霉变种子、虫蛀种子占种子库种子总数的比例分别为50.20%、32.33%、9.89%、2.80%; 但祁连圆柏种仁的饱满种仁率很低,仅为8.05%,种仁干瘪率较高,达53.38%; 虫蛀种仁也占较大比例,为36.51%,主要是由于圆柏大痣小蜂(Megastigmus sabinae)在种子内危害所致。(2)随海拔高度的增加,祁连圆柏土壤种子库种子密度分布趋于“单峰型”,最大密度(110.1±2.41粒·m-2)出现在海拔3200 m,最小密度(55.16±1.66粒·m-2)出现在海拔2600 m。(3)种子数量垂直分布特征为枯落物层>0~5cm层>5~10 cm层,即祁连圆柏土壤种子大量集中在枯落物层而无法与土壤有足够的接触,表明自然条件下祁连圆柏土壤种子很难萌发。本研究补充和完善了祁连山祁连圆柏繁育研究,为祁连圆柏天然更新障碍机制研究提供理论依据。
Abstract:
In order to clarify the composition and vertical spatial distribution characteristics of soil seed bank of Sabina przewalskii under natural conditions, the S.przewalskii forest at an altitude of 2600 m to 3400 m in the middle of the Qilian Mountains were chosen as researched objects.The combination of field sampling, laboratory experiment and data analysis were used to reveal the composition and distribution characteristics of soil seed bank of S.przewalskii. The results indicated that:(1)the proportion of plump seeds, empty seeds, mildewed seeds, and the infested rate in the soil seed bank of S.przewalskii were 50.41%, 32.33%, 9.9% and 3.45% respectively. The plump seed kernels rate(8.05%)was very low, while the shriveled seed kernel rate(53.39%)and the insect-eating seed kernel rate(36.51%)were higher.Additionally, the insect-eating seed kernel was mainly caused by the serious damage of Megastigmus sabinae within seeds.(2)As the altitude increased, the seed density distribution of S.przewalskii forests soil seed bank tended to be single-peak pattern, and the maximum density(110.1±2.41 seeds·m-2)was at the altitude of 3200 m, while the minimum density(55.16±1.6 seeds·m-2)was at the altitude of 2600 m.(3)The vertical distribution of seed quantity was ordered as followed: litter layer>0~5 cm layer>5~10 cm layer.Being localized in the litter layer, the majority of soil seed of S.przewalskii did not have sufficient contact with the soil.And consequently, it was very difficult for S.przewalskii to germinate under natural conditions.This study enrich the breeding research of S.przewalskii and provid a possible explanation for the natural renewal disorder of S.przewalskii in the Qilian Mountains.

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备注/Memo

备注/Memo:
收稿日期(Received date):2018-10-09; 改回日期(Accepted date):2019-04-08
基金项目(Foundation item):甘肃林业科技计划项目(2016kj022)。[Forestry Science and Technology Planning Project of Gansu Province(2016kj022)]
作者简介(Biography):田晓萍(1981-),女,宁夏固原人,副研究员,主要研究方向:森林生态学。[TIAN Xiaoping(1981-), female, born in Guyuan, Ningxia province, associate professor, research on forest ecology] E-mail:tianxiaoping8018@163.com.
更新日期/Last Update: 2019-09-30