应用生态学报2017，Vol.28Issue(12)：3848-3854,7.DOI:10.13287/j.1001-9332.201712.021
短期放牧干扰对黄土丘陵区生物结皮土壤氮素累积的影响
Impact of short-term grazing disturbance on nitrogen accumulation of biological soil crusts in the hilly Loess Plateau region, China
摘要
Abstract
The variations of total nitrogen,available nitrogen and microbial biomass nitrogen caused by simulated grazing disturbance were investigated in the sixth and twelfth months by using field survey combined with laboratory analysis in order to reveal the sensitivity of nitrogen content in biocrustal soils to disturbance in the hilly Loess Plateau region.The results showed that nitrogen contents in biocrustal soil were sensitive to disturbance.Total nitrogen and available nitrogen in the biocrustal layers were decreased by 0.17-0.39 g · kg-1 and 1.78-5.65 mg · kg 1 during the first half-year compared to the undisturbed treatment,and they were found respectively decreased by 0.13-0.40 g · kg-1 and 11.45-32.68 mg · kg-1 one year later since disturbance.The content of microbial biomass nitrogen in the biocrustal layer was reduced by 69.99-330.97 mg · kg-1,whereas the content was increased by 25.51-352.17 mg · kg-1 in soil of 0-2 cm layer.The induction of nitrogen accumulation depended on the intensity of disturbance.Slight variation was observed in the nitrogen accumulation in biocrustal layer under 20％ and 30％ disturbance,while significant reduction was found in the 40％ and 50％ disturbance.Significant reduction was detected only in nitrogen accumulation in the biocrustal layers,whereas no significant influence was found in the top 5 cm soil layer.关键词
模拟放牧/生物结皮/全氮/速效氮/微生物生物量氮Key words
simulated grazing/biological soil crusts/total nitrogen/available nitrogen/microbial biomass nitrogen引用本文复制引用
王闪闪,赵允格,石亚芳,高丽倩,杨巧云..短期放牧干扰对黄土丘陵区生物结皮土壤氮素累积的影响[J].应用生态学报,2017,28(12):3848-3854,7.基金项目
本文由国家自然科学基金项目(41571268,41271298)资助 This work was supported by the National Natural Science Foundation of China (41571268,41271298). （41571268,41271298）
