Nitrogen addition promotes foliar litterfall and element return in a subtropical forest,southwestern China  

作　　者：Yue Zhang Shichen Xiong Chengming You Sining Liu Lixia Wang Li Zhang Han Li Bo Tan Yang Liu Zhenfeng Xu 

机构地区：[1]Forestry Ecological Engineering in the Upper Reaches of the Yangtze River Key Laboratory of Sichuan Province&National Forestry and Grassland Administration Key Laboratory of Forest Resources Conservation and Ecological Safety on the Upper Reaches of the Yangtze River&Institute of Ecology and Forestry,Sichuan Agricultural University,Chengdu 611130,People’s Republic of China

出　　处：《Journal of Forestry Research》2023年第4期939-948,共10页林业研究（英文版）

基　　金：supported by the National Natural Science Foundation of China(grants 32071745,32001165,31901295 and 31800519);the Program of Sichuan Excellent Youth Sci-Tech Foundation(2020JDJQ0052);the Applied Basic Research Program of Sichuan of China(2021YJ0340);the National Key Research and Development Program of China(2016YFC0502505 and 2017YFC0505003).

摘　　要：Nitrogen deposition has a considerable impact on biogeochemical cycling in terrestrial ecosystems.However,how litter production and element return respond to N addition remains poorly understood in nitrogen-rich subtropical regions.In this study,a 4-year nitrogen addition experiment explored its eff ects on foliar litter production and carbon,nitrogen and phosphorus in a subtropical Michelia wilsonii forest.A clear seasonal pattern in foliar litterfall was observed,regardless of nitrogen treatments,with a peak in spring and a smaller one in autumn.Foliar litter increased with increasing nitrogen but did not aff ect litter carbon concentrations and often decreased nitrogen and phosphorous concentrations.The eff ect of nitrogen addition was dependent on time(month/year).Carbon,nitrogen and phosphorous return showed similar bimodal seasonal patterns.Nitrogen addition increased carbon and nitrogen return but did not aff ect phosphorous.Our results suggest that the addition of nitrogen stimulates carbon and nutrient return via litterfall.

关 键 词：Nitrogen addition LITTERFALL Seasonal patterns Element return Subtropical forest 

分 类 号：S714[农业科学—林学]