应用生态学报2016，Vol.27Issue(10)：3213-3220,8.DOI:10.13287/j.1001-9332.201610.002
生物结皮-土壤呼吸对冬季低温及模拟增温的响应
Response of biocrust-soil system respiration to winter low temperature and simulated warming
摘要
Abstract
To study the effects of low temperature and simulated warming on respiration of biocrustsoil systems,intact soil columns covered by two dominant types of biocrusts (moss and algae-lichen crusts),were collected in a natural vegetation area in the southeast fringe of the Tengger Desert.Automated soil respiration system (Li-8150) was used to measure respiration rates in biocrust-soil systems under warming (by placing them in an open top chamber) and non-warming treatments in winter (from November 2015 to January 2016).During the whole observation period,soil respiration rates covered by moss crusts were significantly higher than those covered by algae-lichen crusts,which were-0.052 to 0.418 and-0.032 to 0.493 μmol · m-2 · s-1,respectively.The respiration rates of the two types of biocrust-soil systems showed significant positive linear correlations with soil temperature and volumetric soil water content at 5 cm depth.Through speeding-up the evaporation rates of soil moisture,imitated warming in winter impeded respiration rates of the two biocrust-soil systems.During the whole observation period,the cumulative carbon ? release by moss crust-soil system (9.90 g C · m-2) was dramatically higher than that of algae-lichen crust-soil system (7.00 g C · m-2).The cumulative C release by the biocrust-soil systems in this region in winter was 7.40 g C · m-2,thus comprising an important part of annual C budget in the desert ecosystems.关键词
呼吸作用/生物结皮/低温/模拟增温Key words
respiration/biocrusts/low temperature/simulated warming引用本文复制引用
管超,张鹏,陈永乐,宋光,周媛媛,李新荣..生物结皮-土壤呼吸对冬季低温及模拟增温的响应[J].应用生态学报,2016,27(10):3213-3220,8.基金项目
本文由国家自然科学基金项目(Y311491001)和中国科学院“西部之光”项目资助 This work was supported by the National Natural Science Foundation of China(Y311491001) and the West Light Program for Talent Cultivation of Chinese Academy of Sciences. （Y311491001）
