草业学报2016，Vol.25Issue(9)：10-19,10.DOI:10.11686/cyxb2015528
三峡库区不同土地利用方式下土壤养分含量特征研究
Soil nutrient characteristics of different land-use types in the Three Gorges Reservoir
摘要
Abstract
This study explores variations in soil organic matter,pH value and nutrients in soil under different land-use types in the Three Gorges Reservoir Area.Four different land-use types,including sloping farmland (PG),plantation (RG),barren grassland (HC)and economic forest (JG)in Zhuxi Town of Kaixian County in Chongqing,were selected as the study sites.Three 10 m×10 m sample plots were chosen for each land-use type and soil sat the 0-20 cm layer were collected with “S”shape samples in each plot.Chemical analysis was undertaken to determine soil pH,soil organic matter (SOM)and contents of N,P and K.The results showed that SOM content and pH were not significantly different among four different land-use types.SOM results were in following order:RG (24.99±2.34 g/kg)>JG (19.71 ±1.89 g/kg)>HC (13.72 ±1.79 g/kg)>PG (10.20±0.69 g/kg).Soil pH value was the highest in PG (7.19)and the lowest in RG (5.67).Total nitrogen content varied from 0.55 g/kg to 1.38 g/kg,and available nitrogen content in RG soil was significantly differ-ent from PG,HC and JG.Total nitrogen content had a very significant positive correlation with organic car-bon.C/N varied little under the four land-use types.Total phosphorus and total potassium contents followed similar trends.Total phosphorus content ranged from 0.41 g/kg to 0.59 g/kg,with significant differences be-tween JG and RG.However,available phosphorus and available potassium showed no significant differences between these two land-use types,while total potassium content ranged from 3.73 g/kg to 21.43 g/kg.The pH value was very significantly negatively correlated with soil organic matter,total nitrogen and available ni-trogen,and also significantly negatively correlated with available potassium,but was significantly positively correlated with total phosphorus and total potassium.Soil organic matter had a very significant positive correla-tion with total nitrogen,available nitrogen,available phosphorus and available potassium.These results pro-vide important information for the determination of rational land-use patterns,fertilizing modes and land-use structure adjustment plans that aim to maintain and enhance soil fertility and productivity.关键词
土地利用方式/土壤养分/三峡库区/土壤 pH 值Key words
land use types/soil nutrient/Three Gorges Reservoir Area/soil pH value引用本文复制引用
秦川,何丙辉,蒋先军..三峡库区不同土地利用方式下土壤养分含量特征研究[J].草业学报,2016,25(9):10-19,10.基金项目
科技支撑计划“城乡统筹区村镇建设与污染源控制关键技术与示范”（2013BAJ11B03）和国家自然科学基金“表面反应对酸性土壤中硝化作用及硝化微生物的影响”（41271267）资助。 （）
