植被恢复对亚热带侵蚀红壤团聚体养分分布的影响  

Effect of Vegetation Restoration on Nutrient Distribution Within Aggregate of Subtropical Eroded Red Soils

作　　者：区晓琳[1,2,3] 陈志彪[1,2,3] 姜超[1,2] 陈志强[1,2,3] 任天婧 陈海滨[1,2] 

机构地区：[1]湿润亚热带山地生态国家重点实验室培育基地,福州350007 [2]福建师范大学地理科学学院,福州350007 [3]福建师范大学地理研究所,福州350007

出　　处：《水土保持学报》2016年第6期230-238,共9页Journal of Soil and Water Conservation

基　　金：国家自然科学基金项目"南方红壤侵蚀区芒萁散布的地学分析及其时空模拟"(41171232);国家自然科学基金项目"南方离子型稀土矿区芒萁的蔓延格局与稀土迁聚响应"(41371512);国家科技支撑计划项目"南方红壤水土流失治理技术及示范"(2013BAC08B03)

摘　　要：为深入了解不同植被恢复年限下土壤团聚体养分分布特征,以典型红壤侵蚀区福建省长汀县河田地区恢复年限分别为0,5,10,15,30,80a的坡地土壤为研究对象,分别对0—20cm和20—40cm土层不同粒径团聚体养分含量进行测定,并分析了它们与不同团聚体的相关关系。结果表明：（1）植被恢复过程中,土壤团聚体有机碳、全氮、全磷、全钾、速效磷和速效钾含量的变化范围分别为2.06-27.71g/kg,0.54-2.12g/kg,0.034-0.171g/kg,2.20-6.89g/kg,0.31-3.30mg/kg和7.35-85.71g/kg;（2）有机碳、全氮、全磷和速效磷含量随着团聚体粒径的减小总体上表现出显著升高趋势（P〈0.05）,全钾和速效钾含量无明显差异（P〉0.05）;（3）随植被恢复年限增加,各粒径团聚体中有机碳、全氮、全磷、速效磷含量总体上呈显著升高趋势（P〈0.05）,全钾含量先升高后降低,而速效钾含量表现出波动增加趋势;（4）恢复初期（0a和5a）不同土层间团聚体养分含量无明显变化（P〉0.05）,其它恢复年限0—20cm土层团聚体有机碳、全氮、全磷、速效磷和速效钾含量显著高于20—40cm土层（P〈0.05）;（5）团聚体对土壤养分的贡献率表现为（〉5mm）〉（2-5mm）〉（0.5-1mm）〉（1-2mm）〉（0.25-0.5mm）〉（〈0.25mm）,〉2mm粒径养分贡献率达34.18%-49.93%,土壤养分含量与〉0.25mm粒径相关性较强（P〈0.01）。植被恢复在降低土壤侵蚀的同时,土壤团聚体养分含量明显增加,土壤结构得以改善,养分固持能力得到加强。In order to understand the distribution characteristics of soil aggregate nutrients under different vegetation restoration times,we selected typical eroded red soil sample plots with different restoration time（0year,5years,10 years,15years,30 years and 80years）,which located in Hetian Town,Changting County,Fujian Province of subtropical China in this paper.Nutrient contents of different soil aggregate sizes（〉5mm,2—5mm,1—2mm,0.5—1mm,0.25—0.5mm,and〈0.25mm）with different depths of soil layers（0—20cm and 20—40cm）of sample plots were measured,and the correlation of nutrient contents between soil and aggregates were analyzed as well.The results are as follow：（1）The contents of organic carbon,total nitrogen,total phosphorus,total potassium,available phosphorus and available potassium within soil aggregates were 2.06 to 27.71g/kg,0.54 to 2.12g/kg,0.034 to 0.171g/kg,2.20 to 6.89g/kg,0.31 to 3.30mg/kg and 7.35 to 85.71g/kg,respectively,with the process of vegetation restoration;（2）The contents of organic carbon,total nitrogen,total phosphorus and available phosphorus generally increased with the decreasing of aggregate-size fraction（P〈0.05）,but the contents of total potassium andavailable potassium had no significant difference（P〉0.05）;（3）During different aggregate size fractions,the contents of organic carbon,total nitrogen,total phosphorus and available phosphorus within soil aggregate generally increased with the years of vegetation restoration（P〈0.05）,while the content of total potassium firstly increased and decreased finally,and the content of available potassium showed a fluctuant increase tendency;（4）At the early period of vegetation restoration（0and 5years）,the nutrient contents of soil aggregate of 2layers kept relatively consistent tendency,and soil aggregate nutrient contents in 0—20cm soil layer were significantly higher than in 0—20cm layer;（5）The decreasing order of contribute rate of different aggregate fractions to soil nutrient wa

关 键 词：植被恢复 土壤团聚体 养分分布 红壤侵蚀区 

分 类 号：S152.4[农业科学—土壤学]