| 黄土高原典型草原区草地土壤种子库的动态分析 |
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| 引用本文： | 赵凌平,程积民,万惠娥.黄土高原典型草原区草地土壤种子库的动态分析[J].水土保持通报,2008,28(5):60-65. |
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| 作者姓名： | 赵凌平 程积民 万惠娥 |
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| 作者单位： | 1. 西北农林科技大学,动物科技学院,陕西,杨凌,712100
2. 中国科学院,水利部水土保持研究所,陕西,杨凌,712100;西北农林科技大学,水土保持研究所,陕西,杨凌,712100 |
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| 基金项目： | “973”国家重点基础研究发展计划项目(2007CB106803); 国家科技支撑计划重大项目(2006BAD09B08;2006BAD16B06;2006BAD09B03); 国家自然科学基金重点项目(40730631); 国家林业局荒漠化监测专项项目 |
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| 摘 要： | 采用野外调查取样和室内试验相结合的方法，研究了黄土高原典型草原区草地土壤种子库的物种组成、密度、时空格局和物种多样性等特征。结果表明，（1）土壤种子库中共统计到37个物种，隶属于16科，其中禾本科、菊科、唇形科、豆科和毛茛科的植物占优势。（2）从返青期到枯黄期，种子库中豆科、禾本科、堇菜科所占比例呈下降趋势，唇形科和菊科所占比例明显提高，种子库的密度也显著提高。（3）种子库中种子数量在垂直分布上呈现出由表层土壤向深层逐层减少的变化规律；在水平分布上的变化规律为：封禁〉放牧；阴坡〉阳坡；下坡〉中坡〉上坡。（4）封禁地土壤种子库中的Margalef丰富度和Shannon--Wienner指数都高于放牧地，Pielou均匀性指数低于放牧地。从返青期到枯黄期，封禁地和放牧地土壤种子库的Margalef丰富度、ShannonWienner指数、Pielou均匀性指数都呈下降趋势。
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| 关 键 词： | 典型草原 土壤种子库 封禁 放牧 动态变化 |
| 收稿时间： | 2008/1/21 0:00:00 |
| 修稿时间： | 5/8/2008 12:00:00 AM |
Dynamic Analysis of the Soil Seed Bank for Grassland in a Typical Prairie on the Loess Plateau |
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| ZHAO Ling-ping,CHENG Ji-min and WAN Hui-e.Dynamic Analysis of the Soil Seed Bank for Grassland in a Typical Prairie on the Loess Plateau[J].Bulletin of Soil and Water Conservation,2008,28(5):60-65. |
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| Authors: | ZHAO Ling-ping CHENG Ji-min and WAN Hui-e |
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| Institution: | College of Animal Science and Technology, Northwest A & F University, Yangling, Shannxi 712100, China;Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100, China;Institute of Soil and Water Conservation, Northwast A & F University, Yangling, Shannxi 712100, China;Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100, China;Institute of Soil and Water Conservation, Northwast A & F University, Yangling, Shannxi 712100, China |
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| Abstract: | Field survey and laboratory experiment were conducted to study the characteristics of soil seed bank for the grassland in a typical prairie on the Loess Plateau,such as species composition,density,spatial and temporal pattern distribution,and diversity.Results showed that there were 37 species in the seed bank,which belongs to 11 families.For the species of seed bank,Gramineae,Compositea,Labiatae,Leguminosae,and Panunculaceae were dominant.From green up stage to withering stage,the percentage of Leguminosae... |
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| Keywords: | typical prairie soil seed bank fencing grazing dynamic change |
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