Reconstruction of soil erosion rates from exposed roots in southeast China

IF 1.8 Q2 GEOGRAPHY

Asian Geographer Pub Date : 2017-07-03 DOI:10.1080/10225706.2017.1351380

Yu Zhang, Keyan Fang, Feifei Zhou, Zhipeng Dong, Yingjun Li, Peng Zhang

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引用次数: 2

Abstract

ABSTRACT Southeast China, characterized by a humid subtropical climate, is dominated by dense evergreen broad-leaved forests with the exception for the Changting area, which is one of the most eroded areas in southern China. Various methods have been employed to investigate regional soil erosion dynamics, yet these studies are limited to short periods and few sites. Dendrogeomorphological methods can alleviate this problem due to the long duration of tree rings and easy implementation for many sites. We present the first tree-ring-based soil erosion study in southeastern China, based on 123 exposed roots from 85 Pinus massoniana trees at six sites in Changting. The distinct reduction of cell lumen area of earlywood tracheids of exposed roots is a good bio-indicator for the first year of exposure due to soil erosion for this hot and humid area. The reconstructed soil erosion rates ranged from 4.26 to 43.50 mm/year with an average of 14.14 ± 8.05 mm/year. Soil erosion rate is the highest at the slopes of 10°–30°. This is in line with previous findings using other methods over the study area. In addition, soil erosion in this area is found to be closely related to vegetation types and summer precipitation.

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利用暴露根系重建东南地区土壤侵蚀速率

摘要：中国东南部为亚热带湿润气候，除长汀地区外，其余地区均为茂密的常绿阔叶林，长汀地区是中国南方侵蚀最严重的地区之一。研究区域土壤侵蚀动力学的方法多种多样，但研究时间短，地点少。树木地貌方法可以缓解这一问题，因为树木年轮的持续时间长，而且在许多地点易于实施。本文以长汀市6个点85株马尾松的123个露根为研究对象，在中国东南部进行了首次基于树木年轮的土壤侵蚀研究。由于该湿热地区的土壤侵蚀，暴露根的早木管胞的细胞腔面积明显减少，这是暴露第一年的良好生物指标。重建后的土壤侵蚀率为4.26至43.50 mm/年，平均14.14 ± 8.05 mm/年。土壤侵蚀率在10°-30°的斜坡上最高。这与之前在研究区域使用其他方法的研究结果一致。此外，该地区的土壤侵蚀与植被类型和夏季降水量密切相关。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Asian Geographer GEOGRAPHY-

CiteScore

3.30

自引率

0.00%

发文量

期刊介绍： Asian Geographer disseminates knowledge about geographical problems and issues focusing on Asia and the Pacific Rim. Papers dealing with other regions should have a linkage to Asia and the Pacific Rim. Original and timely articles dealing with any field of physical or human geographical inquiries and methodologies will be considered for publication. We welcome, for example, submissions on people-environment interactions, urban and regional development, transport and large infrastructure, migration, natural disasters and their management, environment and energy issues. While the focus of the journal is placed on original research articles, review papers as well as viewpoints and research notes under the category of “Asian Geography in Brief” are also considered. Review papers should critically and constructively analyse the current state of understanding on geographical and planning topics in Asia. The ‘Asian Geography in Brief’ section welcomes submissions of applied geographical and planning research about Asia. The section aims to showcase (1) the diverse geography and planning of Asia; and (2) the diverse geographical and planning research about Asia. The journal will also publish special issues on particular themes or areas. Book reviews can be included from time to time.