Effects of tree and shrub species on soil quality,sediment detachment capacity caused by rills and surface slope stability in forest lands of Northern Iran  

作　　者：Misagh Parhizkar 

机构地区：[1]Faculty of Agricultural Sciences,University of Guilan,Rasht,Iran

出　　处：《International Journal of Sediment Research》2024年第5期795-803,共9页国际泥沙研究（英文版）

摘　　要：A root system is an important factor to increase soil resistance to detachment of soil particles.However,due to the large number of species,there is a need for studying the impacts of native plant species on soil quality and soil erodibility.This investigation did flume experiments at various soil slopes(9.2%,18.1%,25.1%,and 32.5%)and different water flow rates(0.56,0.67,0.74,0.81,and 0.94 L/(m·s)),to evaluate sediment detachment capacity caused by rills(D_(c))and rill erodibility(K_(r))as well as the soil quality of hillslopes with three common species including Carpinus betulus(as a natural tree species),Alnus glutinosa(as a planted tree species)and Mespilus germanica(as a shrub species)in forestland of northern Iran.The variability of D_(c)has been associated with soil properties and root characteristics of Carpinus betulus.D_(c)was significantly lower(average,−45%)for soils under Carpinus betulus compared to soils with the two other plant species(p<0.01).This was due to the higher values of soil properties including medium weight diameter of soil aggregates(MWD),organic carbon(OC),total nitrogen(TN),total phosphorous(TP),potassium(K),calcium(Ca),magnesium(Mg)as well as to the more extended root system,as confirmed by the negative correlations between D_(c)and the studied variables.K_(r)also was different among the studied soils and plant species.The root system of Carpinus betulus also played a useful role for increasing soil resistance to rill erosion yielding a safety factor(1.61)in the studied forest ecosystem.Overall,the current study supports a broader use of native species(such as Carpinus betulus)in areas exposed to surface erosion and instability,as an effective eco-engineering conservation technique and an alternative technology instead of utilizing artificial and expensive management practices.

关 键 词：Medium weight diameter Nutrient content Rill erodibility Root length density Soil conservation Specific root length 

分 类 号：S15[农业科学—土壤学] TV14[农业科学—农业基础科学]