山西中阳5种人工林地土壤的抗蚀性研究

【目的】分析晋西黄土丘陵区主要人工林地土壤的抗蚀性及其影响因素，为该地人工林建设过程中树种的搭配提供依据。【方法】选择山西中阳县车鸣峪林场神疙瘩管护站的5种人工林地为研究对象,取样测定其土壤的基本理化性质及土壤抗蚀性指数,并分析了5种人工林地土壤抗蚀性及其与土壤理化性质的关系。【结果】1）不同种类人工林的土壤抗蚀性有差异，土壤抗蚀性指数表现为刺槐油松榆树混交林＞油松林＞侧柏林＞刺槐林＞灌木林，不同土层的土壤抗蚀性指数也有区别，表现为0～20 cm土层大于20～40 cm土层。2）土壤抗蚀性指数随着时间的增加而降低，且二者间呈三次函数关系，其中20～40 cm土层土壤抗蚀性指数下降幅度更大。3）土壤抗蚀性指数与粒径＞0.25 mm土壤水稳性团聚体、土壤粘粒（粒径＜0.001 mm）和有机质含量呈显著正相关，其与土壤基本物理性质和化学性质存在一定的线性关系，土壤抗蚀性受土壤基本物理性质的影响较大。【结论】不同人工林地土壤抗蚀性差异较大；为减轻土壤侵蚀，应当营造混交林，保护表层土壤。

Analysis of soil anti-erodibility of five different plantation lands in Zhongyang,Shanxi

【Objective】 Analysis was made on the major plantation corrosion resistance and its influencing factors in hilly-gully loess area of west Shanxi to provide the basis for species with the plantation of the construction process.【Method】 Based on the experiments of dispersion of particals in water,soil anti-erodibility of five different plantation lands in Shanxi Zhongyang was studied,and also the relationship between soil anti-erodibility and soil physical and chemical characteristics was discussed.【Result】 1) There is evident difference in anti-erodibility of plantation lands:soil anti-erosion indices are put in order as follows:Leguminosae×Pinaceae×Ulmacea>Pinaceae>Cupressaceae>Shrubbery.The soil anti-erodibility indices of upper 20 cm are bigger than those under 20 cm.2)The soil anti-erodibility indices are getting lower and lower as time goes on.The relationship between soil anti-erodibility indices and times is cubic function.3)There is close liner relationship between soil anti-erodibility indices and soil properties.The amount of water-stable aggregates(>0.25 mm),soil clay(<0.001 mm) and organic matter is significantly related to soil anti-erodibiliy.【Conclusion】 Different plantation soil anti-erodibility is quite different and in order to reduce soil erosion,we should create mixed forest and protect the topsoil.