石灰岩发育土壤团聚体的分级特征  

the Characteristic of Soil Aggregate Structure-Grading Developed by Limestone

作　　者：刘兵[1,2] 周运超[1,3] 张皓 李可相 郭广正 周焱[1,2] 高安勤[2,5] 

机构地区：[1]贵州大学土地规划与信息技术研究所,贵州贵阳550025 [2]贵州大学农学院,贵州贵阳550025 [3]贵州大学林学院,贵州贵阳550025 [4]清镇市气象局,贵州贵阳551400 [5]六盘水市农业委员会,贵州六盘水553000

出　　处：《耕作与栽培》2016年第6期1-5,共5页Tillage and Cultivation

基　　金：基金项目:贵州岩溶高原石漠化综合治理岩溶碳汇增汇试验与示范(YR-JSHJ-2016-211)

摘　　要：为探索石灰岩发育土壤团聚体的分级特征。采用筛分法,将干筛后的团聚体逐级单独湿筛,得出不同粒级干筛后团聚体的分级特征。通过对不同植被类型下(草本、灌木、乔木)土壤团聚体的分级特征、干筛后平均重量直径、不同粒级干筛后团聚体经湿筛后的本级保留量、平均重量直径及水稳定性团聚体含量进行分析,综合评价其土壤抗蚀性。结果表明>0.5mm的团聚体是土壤团聚体存在的主要形式;土壤各粒级团聚体经湿筛后以本级水稳性团聚体为主,团聚体的量随着粒级变小而不断减少;三种植被类型下干筛后团聚体平均重量直径:草本>灌木>乔木;湿筛后各粒级的平均重量直径均表现为:随着粒级的减小,平均重量直径递级依次减少,团聚体抗蚀性降低;土壤各粒级干筛后团聚体湿筛后各级的保留量和水稳定性团聚体均呈现出:灌木>乔木>草本。三种植被类型中,草本土壤的干筛后团聚体含量最高,灌木土壤的抗蚀性最强。在以后的水土保持措施当中,应以营造植被类型多样的群落为主,更好地形成土壤-植物系统的良性响应。To explore the characteristic of soil aggregate structure for limestone - development zone. By using the method of wet - sieved and dry - sieved, the comprehensive evaluation of soil erosion resistance under different types of vegetation （ grass, shrub and ar- bor）. The soil aggregate grading characteristics, average weight dry - sieved diameter and the stability of different graded aggregate for retention amount of wet - sieved at the corresponding level, mean weight diameter and 〉 0.25 mm of water - stable aggregate content were analyzed. Results showed that aggregate of 〉 0.5 mm was the main composition of soil aggregate, the different graded soil aggre- gate of wet - sieved was given priority to the corresponding aggregate water stability, the quantity of aggregate was decreasing with the decrease of graded. Dry - sieved aggregate average weight diameter under three types of vegetation ： grassland 〉 shrub 〉 arbor. Av- erage weight of each fraction of wet - sieved diameter was as follows ： average weight diameter and erosion resistance reduced of aggre- gate with decreasing of the fraction, each soil graded aggregate of wet - sieved reservations at all levels and the water stability of 〉 0. 25 mm graded aggregate wrer presented： shrub 〉 arbor 〉 grassland, meadow soil aggregate content was the highest, the force of stability shrubbery soil had the strongest resistance toerosion under three vegetation types. In the future soil and water conservation measures, rebuild a variety of types of vegetation communities to form the soil plant system benign response.

关 键 词：石灰岩 植被类型 土壤团聚体 平均重量直径 

分 类 号：S152.4[农业科学—土壤学]