水土保持学报2017，Vol.31Issue(2)：339-344,6.DOI:10.13870/j.cnki.stbcxb.2017.02.055
黄土高原不同年限刺槐土壤化学计量特征分析
Ecological Stoichiometric Characteristics of Soils in Robinia pseudoacacia Forests of Different Ages on the Loess Plateau
摘要
Abstract
In order to clarify the effects of different ages of Robinia pseudoacacia forest on soil nutrient and ecological stoichiometric characteristics,we selected four kinds of artificial Robinia pseudoacacia forests of different ages (10 years,15 years,25 years,and 40 years) located in Yan'an,Shanxi Province to investigate the distribution patterns of soil organic carbon (SOC),total nitrogen (TN),total phosphorus (TP) and total potassium (TK) in the 0-200 cm soil layer,and analyzed the ecological stoichiometric characteristics.Three sample sites were set up in each selected Robinia pseudoacacia forest and three sampling points were set randomly.Soil samples were collected to analyze soil C,N,P,K and stoichiometry.The results showed that:(1) SOC,soil TN and TK increased with the growth of Robinia pseudoacacia forest on the whole,but the change of soil TP with the growth of Robinia pseudoacacia was not obvious.There were significant positive correlations among SOC,soil TN and TP.(2) The spatial distribution of SOC and soil TN were quite consistent,showing the same trend of declining first then tending to be relatively stable with soil depth,and they were higher in the surface layers than in the subsurface layers.TP was lower than SOC and TN in spatial variability.The content of TK was higher than that of SOC,TN and TP,and it did not change much with soil depth.The 15 years occured the minimum Value.(3) Soil C ∶ N ratio,C ∶ P ratio,N ∶ P ratio,C ∶ N ∶ P ratio all decreased first and then deceased with the growth of Robinia pseudoacacia forest.(4) Soil C ∶ N didn't change much,as soil C ∶ P,N ∶ P showed the same trend with SOC and TN with soil depth.关键词
黄土高原/刺槐人工林/化学计量特征Key words
Loess Plateau/Robinia pseudoacacia plantation/stoichiometric characteristics分类
农业科技引用本文复制引用
任璐璐,张炳学,韩凤朋,张兴昌..黄土高原不同年限刺槐土壤化学计量特征分析[J].水土保持学报,2017,31(2):339-344,6.基金项目
国家自然科学基金项目(41471437) （41471437）
国家重点研发计划项目(2016YFA0600801) （2016YFA0600801）
科技基础性工作专项(2014FY210130) （2014FY210130）
西北农林科技大学基本科研业务项目(Z109021429) （Z109021429）
