生态学报2017，Vol.37Issue(1)：44-53,10.DOI:10.5846/stxb201512302599
模拟增温和氮沉降对中亚热带杉木幼林土壤有效氮的影响
Effects of soil warming and nitrogen deposition on available nitrogen in a young Cunninghamia lanceolata stand in mid-subtropical China
摘要
Abstract
Soil available nitrogen is a small but crucial component in the nitrogen pool,as productivity in ecosystems is closely linked to nitrogen availability.Since the world's first Industrial Revolution,global warming has increased and nitrogen deposition has increased;therefore,there is a strong focus on soil available nitrogen.To study the short-term response of soil available nitrogen to climate change (warming,nitrogen deposition),we conducted an experiment in four micro-plots planted with young Cunninghamia lanceolata in a mid-subtropical region,which was subjected to experimentally increased soil temperature (W,+ 5℃) and inorganic nitrogen concentration in artificial precipitation (control [CT],0 kg hm-2 a-1;low nitrogen addition [LN],40 kg hm-2 a-1;and high nitrogen addition [HN],80 kg hm-2 a-1) by using NH4 NO3.Soil available nitrogen was measured monthly by using ion exchange resin bags.After one year,the results showed that soil available nitrogen concentrated primarily in the summer and winter,and nitrate nitrogen was the main form of available nitrogen.Increasing the soil temperature significantly increased the soil available nitrogen content (P ＜ 0.05).In addition,the soil available nitrogen content was related to monthly air temperature and rainfall.Overall,nitrogen deposition significantly increased the soil available nitrogen content (P ＜ 0.05).Under low nitrogen treatment,soil available nitrogen content increased significantly in most months;under high nitrogen,soil available nitrogen was significantly higher every month than that in the control treatment.With the combined treatment of increased soil temperature and nitrogen deposition,the soil available nitrogen content increased significantly each month,more than that by either increased temperature or nitrogen deposition alone.This indicated that increased soil temperatures and nitrogen deposition had a combined effect on soil available nitrogen content.Therefore,increased temperature and nitrogen deposition,individually or combined,increased soil available nitrogen content considerably,and thus could provide plants with sufficient nitrogen for productive growth.关键词
增温/氮沉降/有效氮/中亚热带Key words
warming/nitrogen deposition/available nitrogen/mid-subtropical引用本文复制引用
刘志江,林伟盛,杨舟然,林廷武,刘小飞,陈岳民,杨玉盛..模拟增温和氮沉降对中亚热带杉木幼林土壤有效氮的影响[J].生态学报,2017,37(1):44-53,10.基金项目
国家重点基础研究发展计划(2014CB954003) （2014CB954003）
国家自然科学基金项目(31130013) （31130013）
