Effects of vegetation type on soil resistance to erosion: Relationship between aggregate stability and shear strength
Effects of vegetation type on soil resistance to erosion: Relationship between aggregate stability and shear strength
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DOI：
10.1016/j.catena.2011.05.006
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发表时间：
2011-10-01
期刊：
影响因子：
6.2
通讯作者：
Stokes, A.
中科院分区：
文献类型：
--
作者：
Fattet, M.;Fu, Y.;Stokes, A.
土壤水分侵蚀和浅层滑坡主要依赖于团聚体稳定性和土体抗剪强度。在中国坡地改造项目的背景下，我们研究了植被对原农田植被侵蚀保护区土壤团聚体稳定性和抗剪强度的影响（通过直接剪切试验）。对四种处理方法进行了分析，包括：(i)去除林下植被的4年生作物林；（ii）福地草和优势林下种金菖蒲；（iii）只有金银花及（iv）没有植被。土壤取样深度分别为0 ~ 5 cm和45 ~ 50 cm。测定了5种径级根系长度密度（RLD），测定了土壤有机碳（SOC）、热水可提碳（HWEC）、土壤质地和铁、铝氧化物含量。结果表明，a层有白头翁的平均湿后重径（MWDSW）为0.94 ~ 1.01 mm，显著高于无白头翁的0.57 ~ 0.59 mm。最小直径级的SOC和RLD (
Soil water erosion and shallow landslides depend on aggregate stability and soil shear strength. We investigated the effect of vegetation on both soil aggregate stability and shear strength (through direct shear tests) in former croplands converted to vegetated erosion protection areas within the context of China's sloping land conversion programme. Four treatments were analysed in plots comprised of (i) 4 year old crop trees, Vernicia fordii, where understory vegetation was removed; (ii) V. fordii and the dominant understory species Artemisia codonocephala; (iii) only A. codonocephala and (iv) no vegetation. Soil samples were taken at depths of 0-5 cm and 45-50 cm. Root length density (RLD) in five diameter classes was measured, soil organic carbon (SOC), hot water extractable carbon (HWEC), texture and Fe and Al oxides were also measured. We found that mean weight diameter after slow wetting (MWDSW) in the A-horizon, was significantly greater (0.94-1.01 mm) when A. codonocephala was present compared to plots without A. codonocephala (0.57-0.59 mm). SOC and RLD in the smallest diameter class (