青藏高原典型植被土壤溶解性氮与植物量相关性分析-《山地学报》

文章信息/Info

Title:: Relationship Between Dissolved Nitrogen and Plant Biomass in Qing-Tibet Plateau Typical Vegetation Types

作者:: 林丽;李以康;崔莹;张法伟;韩道瑞;郭小伟;李婧;曹广民;; 1.中国科学院西北高原生物研究所，青海西宁810001；
2.甘肃农业大学草业学院，甘肃兰州730070

Author(s):: LIN Li; LI Yikang; CUI Ying; ZHANG Fawei; HAN Daorui; GUO Xiaowei; LI Jing; CAO Guangmin; 1.Northwest Institute of Plateau Biology，the Chinese Academy of Sciences，Xining 810008，China;
2.Gansu Agriculture University，Lanzhou，730070

Keywords:: dissolved organic nitrogen; dissolved inorganic nitrogen; plant biomass; alpine meadow

摘要:: 研究区域位于中国生态网络海北高寒草甸生态系统定位研究站,选取青藏高原典型植被禾草-矮嵩草草甸、小嵩草草甸和金露梅灌丛草甸,对其土壤速效无机氮(IN)/溶解性有机氮(DON)储量与植物量相关性进行分析,发现三种草地土壤IN储量同地上植物量具有正相关性,其中灌丛相关系数高于草甸;地带性植被(禾草-矮嵩草草甸)土壤IN储量同地上植物量之间的相关性高于其偏途演替阶段(小嵩草草甸);土壤溶解性有机氮的消耗同地上植物量的形成具有一定程度的正相关性,其中小嵩草草甸和金露梅灌丛草甸达到中度相关水平,禾草-矮嵩草草甸为低度相关水平;地下根系现存量同IN/DON之间均没有明显的相关关系。说明土壤IN/DON对地上...

Abstract:: Using chemical analysis to study the relationship between dissolved inorganic nitrogen/dissolved organic nitrogen and biomass in three typical plateau vegetations，which are Gramineae- Kobresia humilis meadow，Potentilla fruticosa Shrub meadow and Kobresia pygmae meadow. The results showed that: there was a positive relationship between dissolved inorganic nitrogen formation and plant biomass aboveground，Shrub meadow had higher correlation coefficient than other ones，and the health grassland had stronger interaction than subhealth grassland. There was positive relationship between dissolved organic nitrogen consumption and plant biomass aboveground，and they were medium correlation coefficient in P. fruticosa Shrub meadow and K. pygmae meadow，while it was weaker correlation coefficient in G. K. humilis meadow. There was no relationship between plant biomass below ground and dissolved inorganic or dissolved organic nitrogen. To sum up，dissolved organic nitrogen and inorganic nitrogen maybe have different contribution to plant biomass aboveground in different plant vegetations. But we don’t know what kinds of forms and processes of dissolved nitrogen playing in different meadows.

备注/Memo:: 收稿日期(Received date)：2011-12-25；改回日期(Accepted) : 2012-06-08。
基金项目（Foundation item）：国家自然科学
基金项目（30970520），国家自然科学基金重点项目(41030150)。\[National Natural Science Foundation Project(30970520), National Key Research of China in Natural Science(41030150).\]
作者简介（Biography）：林丽（1980-），女（满族），辽宁抚顺市人，硕士，工程师，从事高寒草甸生态化学数量学相关研究。\[Lin Li(1980~), female ,Manchu nationality, Fushun Liaoning province，master，engineer, research direction：ecological stoichiometry.\]Tel:13309714360, E-mail：hanxiao_2000_00@126.com *
通讯作者(Communication author)：曹广民 \[Cao Guangmin\]E-mail :caogm@nwipb.cas.cn\]