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Old-field Succession Sequence in Loess Area in Northern Shaanxi of China



Yaojun Boa, b, Qingke Zhub, *, Weijun Zhaoc
a College of Life Sciences, Yulin University, Yulin, Shaanxi, 719000, China
b College of Water and Soil Conservation, Beijing Forestry University, Beijing 100083, China
c Key Laboratory of Tourism and Resources Environment in Colleges and Universities of Shandong Province, Taishan University, Taian, Shandong 271021, China


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Creative Commons License
© 2015 Bo et al.

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: (https://creativecommons.org/licenses/by/4.0/legalcode). This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

* Address correspondence to this author at the College of Water and Soil Conservation, Beijing Forestry University, Beijing 100083, China; Tel: +86-10-6233-6083; Fax: +86-10-6233-6083; E-mail: zhuqingke2013@126.com


Abstract

Hierarchical clustering method was applied for division of stages of old-field succession of loess area of Northern Shaanxi, and the similarity among different communities in abandoned field of different abandoned year and site condition can be learnt quantitatively, and stages or sequence of old-filed succession can be determined. The result revealed that the stages of old-field succession are: polydominant association of annual weed artemisia scoparia and other perennial herbage→Lespedeza davurica and perennial herbage association→artemisia vestita and perennial herbage association→tuft grass bothriochloa ischaemum and perennial herbage association→undershrub Buddleja alternifolia association. Among them, the appearance of shrub association (undershrub Buddleja alternifolia) contrasts results in former studies that it was impossible to form shrub association in loess area of Northern Shaanxi. Thus, this study is not only a complement of former studies, but also a new discovery and innovation.

Keywords: Community,, Ecological restoration, Euclidean distance, Hierarchical clustering, Importance values of species, Succession sequence.



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