The Responses of Soil Nitrogen Transformations to Rainfall Reduction Mainly Occurred in the Early Growing‐Season in a Temperate Meadow

Author:

Yang Xuechen123ORCID,Sternberg Marcelo45ORCID,Song Wenzheng2ORCID,Zhong Shangzhi26,Chai Hua2,Li Junqin2,Yao Yuan2,Meng Bo2,You Mengyang37,Jiang Qi28,Yue Xiuquan2,Li Lu‐Jun3ORCID,Ma Jian‐Ying1ORCID,Sun Wei2ORCID

Affiliation:

1. Key Laboratory of Geographical Processes and Ecological Security in Changbai Mountains Ministry of Education School of Geographical Sciences Northeast Normal University Changchun China

2. Key Laboratory of Vegetation Ecology of the Ministry of Education Institute of Grassland Science Jilin Songnen Grassland Ecosystem National Observation and Research Station School of ife Sciences Northeast Normal University Changchun China

3. State Key Laboratory of Black Soils Conservation and Utilization Northeast Institute of Geography and Agroecology Chinese Academy of Sciences Harbin China

4. School of Plant Sciences and Food Security Wise Faculty of Life Sciences Tel Aviv University Tel Aviv Israel

5. Breeding Base for State Key Laboratory of Land Degradation and Ecological Restoration in Northwestern China Ningxia University Yinchuan China

6. Grassland Agri‐Husbandry Research Center College of Grassland Science Qingdao Agricultural University Qingdao China

7. School of Environmental Science and Engineering Guangzhou University Guangzhou China

8. No. Fifteen Senior High School of Mudanjiang Mudanjiang China

Abstract

AbstractDrought is expected to increase in temperate regions in the coming decades due to global climate change and will strongly affect nitrogen (N) transformation and balance. However, the underlying mechanisms (soil microenvironment vs. biotic community) of rainfall reduction induced changes in soil N transformation rates, and whether the responses of soil N transformation rates to rainfall reduction vary over time remains poorly understood. In this study, we experimentally examined rainfall reduction effects on soil N transformation rates over two (the second and third experimental years) growing‐seasons in a temperate meadow. We applied four treatments: ambient rainfall, 30%, 50%, and 70% reduction in rainfall. Our findings demonstrated that, 70% rainfall reduction significantly decreased the average net N mineralization and nitrification rates by 68.4% and 72.0%, respectively. Soil nitrous oxide emission was profoundly varied between the experimental years, with it was sensitive no only to changes in annual precipitation amount, but also to seasonal distribution, the highest emissions appeared at the early growing‐season. Moreover, plant diversity, microbial biomass, and soil NO3‐N content mainly regulated soil N transformation rates in response to rainfall reduction in the greater annual precipitation year; but soil N transformation rates were mainly controlled by soil water content in the less annual precipitation year. We suggest that to accurately project future ecosystem functions and improving the prediction of N cycling responses to changing precipitation patterns, stronger focus should be allocated not only to changes in precipitation amounts, but also to inter‐ and intra‐annual differences in precipitation distribution.

Funder

National Natural Science Foundation of China

Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences

China Postdoctoral Science Foundation

Natural Science Foundation of Jilin Province

Publisher

American Geophysical Union (AGU)

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3