Plant roots and anti-scourability of soils in the Shangshe Catchment, Dabie Mountains, Anhui Province, Eastern China |
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Authors: | Jiayao Zhuang Jinchi Zhang Bo Zhang Hongyan Luo Xiaying Huang Jun Fu |
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Institution: | (1) College of Forest Resources and Environment, Nanjing Forestry University, Nanjing, 210037, China;(2) Anhui Forestry Department, Hefei, 230001, China |
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Abstract: | The distribution of root biomass was studied in different soil layers (0–10, 10–20, 20–30, 30–40 cm) by means of a “study
plot” method for various plant species in the Shangshe Catchment area in the Dabie Mountains, Anhui Province. The number and
lengths of root samples were recorded. In each study plot, anti-scourability of soils in corresponding soil layers was measured
with a C.C. Suoboliefu anti-scourability instrument. The results showed the following: 1) The root system was largely distributed
in the 0–40 cm soil layer and the number of roots was the largest in the surface soil layer. Fine roots<1 mm in diameter predominated
in root length. 2) In the same section, the anti-scourability indices of the surface soil layer were larger than those of
other soil layers in the various plant species. The tree root system, especially the fine roots<1 mm in diameter, are highly
instrumental in controlling soil losses. Correlation coefficients of length, number and density of fine roots and the anti-scourability
index were 0.8173, 0.7159 and 0.6434, respectively. The length of fine root is a key factor in the anti-scourability soil
index. This index is closely correlated with the non-capillarity of each soil type, indicating that forests have a strong
soil stabilizing function, because their root systems improve physical soil properties and ultimately are responsible for
the establishment of a biosoil system with an anti-scourability index.
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Translated from Science of Water and Soil Conservation, 2007, 5(6): 15–20 译自: 中国水土保持科学] |
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Keywords: | Shangshe Catchment root system soil antiscourability index |
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