岩溶区土壤有机碳和团聚体的关系研究——以重庆市中梁山岩溶槽谷为例  

Correlation between soil organic carbon and water-stable aggregate in karst area——A case study in Zhongliangshan karst valley,Chongqing

作　　者：段正锋[1] 傅瓦利[1] 甄晓君[1] 杜富芝[1] 

机构地区：[1]西南大学地理科学学院土壤实验室,重庆400715

出　　处：《中国岩溶》2009年第1期75-79,共5页Carsologica Sinica

基　　金：重庆软科学项目"石漠化与重庆岩溶地区农村经济发展关系研究"(CSTC;2006EB1040)

摘　　要：研究了重庆市中梁山岩溶槽谷不同土地利用方式对土壤有机碳和团聚体稳定性的影响,在此基础上引入通径分析方法探讨有机碳与各粒径团聚体之间的关系。研究表明,土地利用方式对土壤有机碳、团聚体稳定性指数和团聚体保存几率影响明显:坡耕地有机碳含量仅为17.544(g/kg),分别比灌丛、橘林地、草地和菜地低61.14%、71.66%、74.43%和100.83%;团聚体稳定性指数依次为草地(2.394)>灌丛(2.383)>橘林地(2.085)>坡耕地(1.953)>菜地(0.865);团聚体稳定性与有机碳含量的相关性与土地利用方式有关,在灌丛和草地中明显正相关,在橘林地和菜地中呈负相关,而在坡耕地中相关性不明显;大粒径团聚体保存几率是决定有机碳含量的主要因子,5～10mm和3～5mm粒级的土壤团聚体对有机碳累积与稳定的决定系数分别为0.61和0.50。As crucial indicators of soil quality, soil organic carbon and soil water-stable aggregates play key roles in soil chemical, physical and biological properties and processes and have close correlation with each other. Effects of different land-use types on the distribution of soil water-stable aggregate and content of soil organic carbon as well as the correlation between soil organic carbon and soil water-stable aggregate are stud- ied systematically with path analysis in the paper. The soil samples were collected from Beibei, Chongqing under major different land-use types. The results revealed that the types of land use had significant influences to soil organic carbon, soil water-stable aggregate stability index and conservation ratios of soil waterstable aggregate. The content of soil organic carbon in slopping field was only 17. 544g/kg, which is lower than that in shrub land, orange land, grassland and vegetable land by 61. 14%, 71. 66%, 74. 43% and 100.83% respectively. The soil water-stable aggregate stability indexes were 2. 394 in grassland 2〉2. 383 in shrub land 〉2. 085 in orange land〉1. 953 in slope field 〉0. 865 in vegetable land. Correlation analysis showed that soil water-stable aggregate stability and soil organic carbon was obvious positively correlated in shrub land and grassland and negatively correlated in orange land and vegetable land, but unremarkably correlated in slope field. Path analysis showed that the conservative probability of large size water-stable aggregate is one of the main factors which affect the organic carbon content, the decision coefficients of 5-10mm and 3-Smm water-stable aggregates were 0. 61 and 0. 50.

关 键 词：土壤有机碳 团聚体稳定性 通径分析 土地利用方式 

分 类 号：S152.4[农业科学—土壤学]