天山北坡围栏封育条件下伊犁绢蒿幼苗分布格局及数量动态变化规律研究

草业学报 ›› 2009, Vol. 18 ›› Issue (4): 17-26.

天山北坡围栏封育条件下伊犁绢蒿幼苗分布格局及数量动态变化规律研究

鲁为华^1,2,3,朱进忠^1,2*,王东江¹,靳瑰丽^1,2,余博¹

1.新疆农业大学草业与环境科学学院,新疆乌鲁木齐 830045;
2.新疆草地资源与生态实验室,
新疆乌鲁木齐 830045;
3.石河子大学动物科技学院,新疆石河子 832003

收稿日期:2008-09-23 出版日期:2009-08-20 发布日期:2009-08-20
作者简介:鲁为华(1976-),男,新疆奇台人,讲师,在读博士。E-mail:winnerlwh@tom.com
基金资助:
新疆草地资源与生态重点实验室开放课题(XJDX0209-2007-03)资助。

Distribution pattern and dynamic population changes of Seriphidium transiliense seedlings in fenced enclosures in the northern Tianshan Mountains

LU Wei-hua^1,2,3, ZHU Jin-zhong^1,2, WANG Dong-jiang¹, JIN Gui-li^1,2, YU Bo¹

1.College of Pratacultural and Environmental Science, Xinjiang Agricultural University, Urumqi 830045,
China; 2.Xinjiang Key Laboratory of Grassland Resources and Ecology, Urumqi 830045, China;
3.The College of Animal Technology & Science, Shihezi University, Shihezi 832003, China

Received:2008-09-23 Online:2009-08-20 Published:2009-08-20

摘要/Abstract

摘要： 采用空间分布型指标对围栏封育条件下的伊犁绢蒿幼苗种群进行了空间分布格局分析,结果表明,在5和9月2个时间点上,无论围栏内外,幼苗均呈聚集分布的空间格局,但不同时间点和围栏内外的幼苗分布聚集程度存在差异,这种差异是由于环境条件的空间异质性引起的;进一步采用TAYLOR幂法则、IWAOY对M的回归法进行分布格局的拟合检验,检验结果与各空间分布型指标的结果相符合,可以确定绢蒿幼苗种群为聚集分布且适宜取样面积为4 m²;采用DCCA(除趋势对应典范分析)和相关分析对围栏内外的幼苗数量和环境因子的关系进行分析,表明幼苗数量和环境因子之间存在密切相关,同时可以将幼苗数量的发生类型按生境条件分为4类;对4类生境条件下的不同时间的幼苗存活数量进行了统计,表明不同生境下幼苗的初始萌发数量存在巨大的差异且在夏季死亡率极高,呈现出“爆发性出苗”和“骤然性死亡”的特点;对幼苗发生规律的统计结果表明,4种生境条件下的幼苗发生高峰均出现在4月,之后急剧下降,7和8月几乎没有幼苗发生。幼苗死亡率极高且发生时间强烈集中,这主要是由于环境筛选和竞争共同作用的结果。

Abstract: Spatial distribution pattern analysis was used to describe distribution patterns of Seriphidium transiliense seedlings. Seedlings had a clumped pattern of distribution in May and September both inside and outside the fenced area, but the degree of aggregation was different due to the spatial heterogeneity of the environmental conditions; the IWAOY regression and TAYLOR principle analyses of the spatial distribution of indicators in line gave the same results. The sampling area of S. transiliense seedlings was 4 m²; DCCA and correlation analysis showed that the number of seedlings was positively correlated with environmental factors, and that the seedling populations could be classified into four categories according to the habitat conditions. There were huge differences in the numbers of surviving seedlings at different times under different habitat conditions: Large numbers of seedlings germinated initially and there was a high mortality rate in the summer, characteristics of “explosive emergence” and “sudden death”. Peak seedling emergence was in April in all four habitat conditions and was followed by sharp decreases in July and August with almost no surviving seedlings. The high mortality rate and a strong focus in time, were mainly due to intensive environmental selection and to competition.

中图分类号:

Q948.2

鲁为华,朱进忠,王东江,靳瑰丽,余博. 天山北坡围栏封育条件下伊犁绢蒿幼苗分布格局及数量动态变化规律研究[J]. 草业学报, 2009, 18(4): 17-26.

LU Wei-hua, ZHU Jin-zhong, WANG Dong-jiang, JIN Gui-li, YU Bo. Distribution pattern and dynamic population changes of Seriphidium transiliense seedlings in fenced enclosures in the northern Tianshan Mountains[J]. Acta Prataculturae Sinica, 2009, 18(4): 17-26.

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