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

doi:10.13287/j.1001-9332.201712.021

应用生态学报 ›› 2017, Vol. 28 ›› Issue (12): 3848-3854.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

王闪闪^{1, 2, 3}, 赵允格^2*, 石亚芳¹, 高丽倩^{2, 3}, 杨巧云¹

¹西北农林科技大学资源环境学院, 陕西杨凌 712100
²中国科学院水利部水土保持研究所黄土高原土壤侵蚀与旱地农业国家重点实验室, 陕西杨凌 712100
³中国科学院大学, 北京 100049

收稿日期:2016-12-19 出版日期:2017-12-18 发布日期:2017-12-18
通讯作者: * E-mail: zyunge@ms.iswc.ac.cn
作者简介:王闪闪,女,1991年生,硕士研究生.主要从事生物结皮对土壤氮素的影响研究.E-mail:wss91@foxmail.com
基金资助:
本文由国家自然科学基金项目(41571268,41271298)资助

Impact of short-term grazing disturbance on nitrogen accumulation of biological soil crusts in the hilly Loess Plateau region, China

WANG Shan-shan^1,2,3, ZHAO Yun-ge^2*, SHI Ya-fang¹, GAO Li-qian^2,3, YANG Qiao-yun¹

¹College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, Shaanxi, China
²State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resource, Yangling 712100, Shaanxi, China
³University of Chinese Academy of Sciences, Beijing 100049, China

Received:2016-12-19 Online:2017-12-18 Published:2017-12-18
Contact: * E-mail: zyunge@ms.iswc.ac.cn
Supported by:
This work was supported by the National Natural Science Foundation of China (41571268,41271298)

摘要/Abstract

摘要： 通过野外调查结合室内分析,研究了黄土丘陵区模拟放牧干扰半年和一年后生物结皮土壤全氮、速效氮和微生物生物量氮累积的变化,以期揭示生物结皮土壤氮素对干扰响应的敏感性.结果表明: 生物结皮土壤氮素对干扰响应敏感,短期干扰可导致土壤全氮、速效氮和微生物生物量氮含量降低.干扰半年后,生物结皮层全氮和速效氮含量较不干扰分别下降0.17～0.39 g·kg^-1、1.78～5.65 mg·kg^-1;干扰一年后,分别下降0.13～0.40 g·kg^-1、11.45～32.68mg·kg^-1,生物结皮层微生物生物量氮下降69.99～330.97 mg·kg^-1,0～2 cm土壤微生物生物量氮增加25.51～352.17 mg·kg^-1.干扰对生物结皮土壤氮素累积的影响与干扰强度有关,20%和30%干扰强度下生物结皮层氮素累积变化不显著,40%和50%干扰强度下生物结皮层氮素累积显著降低.短期干扰降低了生物结皮层氮素累积,但表层5 cm土壤氮素含量变化不显著.

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.

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.

WANG Shan-shan, ZHAO Yun-ge, SHI Ya-fang, GAO Li-qian, YANG Qiao-yun. Impact of short-term grazing disturbance on nitrogen accumulation of biological soil crusts in the hilly Loess Plateau region, China[J]. Chinese Journal of Applied Ecology, 2017, 28(12): 3848-3854.

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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

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