青海湖地区芨芨草草地土壤种子库的初步研究

生态学杂志 ›› 2005, Vol. ›› Issue (7): 724-728.

青海湖地区芨芨草草地土壤种子库的初步研究

周国英^1,2, 陈桂琛¹, 王顺忠^2,3, 韩友吉^1,2

1. 中国科学院西北高原生物研究所, 西宁, 810008;
2. 中国科学院研究生院, 北京, 100039;
3. 中国科学院沈阳应用生态研究所, 沈阳, 110016

收稿日期:2004-09-19 修回日期:2004-11-16 出版日期:2005-07-10
通讯作者: 陈桂琛
基金资助:
国家中西部专项资金资助项目(K99-05-11).

Soil seed banks of Achnatherum splendens steppes in the Qinghai Lake area

ZHOU Guoying^1,2, CHEN Guichen¹, WANG Shunzhong^2,3, HAN Youji^1,2

1. Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining 810008, China;
2. Graduate School of Chinese Acadeny of Sciences, Beijing 100039, China;
3. Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China

Received:2004-09-19 Revised:2004-11-16 Online:2005-07-10

摘要/Abstract

摘要： 选择青海湖地区的次生芨芨草草地为研究对象,以围栏内封育和围栏外自由放牧的草地做对照,研究了围栏内外土壤种子库的萌发状况、密度和数量、物种多样性,以及土壤种子库与地上植被的关系.结果表明,围栏内外土壤种子库的萌发趋势非常相似,但是萌发种子累计数量不同;围栏内外土壤种子库中萌发种子的平均密度分别为3 660和2 460粒·m^-2,围栏内萌发种子数比围栏外提高了48.8%;围栏内外土壤种子库的物种多样性指数差异较大,围栏内外丰富度指数R₁分别为17和13,R₂为3.693和2.832,丰富度围栏内大于围栏外,多样性指数和丰富度指数具有相同的规律,均匀度指数围栏内外分别为0.812和0.87,则是围栏外大于围栏内.围栏内外地上植被群落组成存在显著差异,围栏内的封育草地的物种丰富度和多样性指数均大于围栏外的放牧草地,而均匀度指数则呈相反趋势.

关键词: 麦棉两熟, 棉花, 根际和非根际, 土壤酶活性, 土壤养分含量

Abstract: The study was conducted in the sheep breeding pasture-land of Sanjiao in Qinghai Province,which was located on the northern bank of Qinghai Lake.The germinated seed accumulation,density,amount,diversity of Achnatherum splendens communities,soil seed banks,and relationship between the vegetation and soil seed banks were studied and compared within and out of the fence.The results showed that the germination trend of soil seed banks was similar within and out of the fence,while the seed accumulation was different.The average density of germinationant seed within and out of the fence was 3660 seeds穖^-2 and 2460 seeds穖^-2.The number of seed accumulation was between 10³ and 10⁴ seeds穖^-2.Diversity indices of soil seed banks within and out of the fence were significantly different.Richness indices R1 and R2 within and out of the fence were 17 and 13,3.693 and 2.832,respectively.The change of diversity indices was the same as richness indices.Evenness indices E1 within and out of the fence were 0.812 and 0.857 respectively.The community composition within and out of the fence was significantly different.The diversity index change of vegetation was the same as the soil seed banks.

Key words: Wheat-cotton double cropping, Cotton, Rhizosphere and non-rhizosphere zones, Soil enzyme activity, Soil nutrient content

中图分类号:

Q948

周国英, 陈桂琛, 王顺忠, 韩友吉. 青海湖地区芨芨草草地土壤种子库的初步研究[J]. 生态学杂志, 2005, (7): 724-728.

ZHOU Guoying, CHEN Guichen, WANG Shunzhong, HAN Youji. Soil seed banks of Achnatherum splendens steppes in the Qinghai Lake area[J]. cje, 2005, (7): 724-728.

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