The research showed that pam could improve soil structure , and greatly increase the stabilization of soil aggregates , so soil crust development would be decreased . fifthly , soil grain that controls rainfall splash erosion was obtained , the influence of soil clay was very great during initial stages of rainfall . with rainfall going on , soil coarse sand and fine sand would control the splash erosion 五、控制土壤溅蚀的主要土壤粒级：在降雨初期土壤的的粘粒对溅蚀速率的影响较大，随着降雨历时的延长，土壤中的细砂和粗砂成为溅蚀速率影响较大的因子；六、对土壤溅蚀影响较大的土壤结构特征因子：降雨5分钟时，土壤的渗透系数对溅蚀速率的影响较大，随着降雨的继续进行，土壤的团聚度一直对土壤溅蚀速率影响较大。
The soil organo - mineral complexes , formed by intimate association of organic matters or humic substances and mineral , is one of the fundamental features that distinguishes soils from their geological parent materials , and effects on the nature of soil aggregate , and the amounts and characters of soil particle aggregation is closely related to soil fertility . by way of collecting soil samples outdoors and analysis indoors and using the dry land soils developed from purple soils as research materials , this paper investigated status of organo - mineral complexion , characters of aggregation and soil fertility for discussing the relationship among them under different land treatments , and the factors that influencing the amounts and characters of organo - mineral complexion and soil aggregation and restricting status of soil fertility , the main results were as follows : there were remarkable differences of status and activity of fe oxide and aluminum oxide in dry land soils developed from different parent soils and under different utilizations 土壤中有机物质和矿物质的结合?土壤有机无机复合体是土壤区别其母质的基本特征之一，它对土壤团聚体的性质有很大的影响，而团聚体的数量和性状有跟土壤肥力密切相关，本文以不同母岩发育的旱地紫色土作为研究材料，通过野外采样和室内分析，研究了旱地紫色土的有机无机复合状况、团聚体特征和肥力水平，探讨了在不同土地利用方式下它们之间的关系，以及影响有机无机复合、土壤中团聚体的数量、性质以及制约土壤养分状况的因素，主要结果如下：不同类型的紫色土铁铝氧化物形态和活性具有很大差别。
Ploughing deeper and corn residues might promote formation of soil aggregated structure , decrease soil bulk density , relax solum , decrease soil porosity , raise soil permeability , improve soil structure and holding - water capability , create better soil biology condition for growth of crop , and coordinate water , fertilizer , air and heat etc . to prevent the fertility deterioration of the corn belt phaeozem and ameliorate soil , it is need to reform tillage and fertilizer application for the corn belt phaeozem in the central part of jilin 针对吉林玉米带黑土土壤退化现象，从黑土玉米的耕作制和施肥制的改革入手，并结合农村现有机械和技术水平，采用玉米“轻主重辅”三三耕作制和玉米“一稳二减三补”施肥技术，提出吉林玉米带黑土土壤调控技术体系。
Study on granular structure in laterite vn soil has already been reported in different land use pattern but it is little about soil fertility in karst environment . the better the soil structure , the higher the content of water - stable soil aggregate so there is an osculation correlation between aggregate and structure of soil 不同利用模式下红壤团粒结构的特征研究己有报道，但关于岩溶环境中土壤变化的研究则很少。土壤团聚体与土壤的结构密切相关，团聚体含量高，则说明土壤结构好。
2 . the structure of purple soil is meliorated by sabaigrass . when contrast to bare land treatment and natural wild grassland treatment we knew that sabaigrass treatment and grass tree solid plating treatment reduced soil bulk density , enhanced soil capillary porosity , non - capillary porosity and porosity ratio , decreased soil sand grain content , enhanced soil clay grain and silt grain content so as to reduced the dispersal degree of soil , improved the aggregate capacity of soil , increased the amount of soil aggregate structure , meliorated the water permeability of soil , accelerated the form of good soil structure 龙须草能改善紫色土的土壤结构龙须草纯种植被和林草立体种植植被能不同程度地降低土壤容重，减少土壤砂粒含量，增加土壤的毛管孔隙度、非毛管孔隙度和孔隙比，以及增加粉粒含量，从而降低土壤分散度，提高土壤团聚性，增加土壤团粒结构数量，改善土壤的透水性，促进良好土壤结构的形成，最终提高土壤的蓄水保肥性能，增强土壤的抗蚀性和抗冲性。
