天山云杉林下优势草本植物化学计量内稳性特征  

Nutrient and Stoichiometric Characteristics of Dominant Herbaceous in Spruce Forests on the Northern Slope of Tianshan Mountains

作　　者：阿里木·买买提[1] 李翔[1] 卡哈尔曼·恰依扎旦 常顺利[3] Alim·Mamat;LI Xiang;Kahlman·Chayizadan;CHANG Shun-li(Institute of Forest Ecology,Xinjiang Academy of Forestry,Urumqi 830063,Xinjiang,China;Hami Ecological Restoration and Protection Center,Hami 839000,Xinjiang,China;Key Laboratory of Oasis Ecology,College of Resources and Environment Science,Ministry of Education/Xinjiang University,Urumqi 830046,Xinjiang,China)

机构地区：[1]新疆林业科学院森林生态研究所,新疆乌鲁木齐830063 [2]哈密市生态修复保护中心,新疆哈密839000 [3]新疆大学资源与环境科学学院,绿洲生态教育部重点实验室,新疆乌鲁木齐830046

出　　处：《西北林学院学报》2022年第2期68-74,共7页Journal of Northwest Forestry University

基　　金：自治区公益性院所基本科研业务专项资金项目(KY2020015)。

摘　　要：为探讨新疆天山云杉林下优势草本植物的生态化学计量变化特征,以天山北坡海拔2000~2800 m范围内天然云杉林下优势草本植物天山羽衣草为研究对象,分别测定天山羽衣草地上部、根系和土壤的C、N、P、K含量,并分析其生态化学计量特征及内稳性。结果表明,1)天山羽衣草地上部养分含量低海拔区域高于高海拔区域,根系养分含量高海拔区域高于低海拔区域,其中,海拔Ⅱ和Ⅳ的土壤养分含量高于海拔Ⅰ和Ⅲ(P<0.05);2)天山羽衣草地上部C∶P、C∶K、N∶P、K∶P低海拔区域大于高海拔区域;根系C∶P、N∶P和K∶P呈现随海拔升高先增大后减小的趋势(P<0.05),不同海拔土壤元素计量比差异不显著(P>0.05),但呈现出低海拔区域高于高海拔区域的趋势;3)天山羽衣草地上部和根系养分特征与对应土壤养分特征相关性不显著(P>0.05);4)天山羽衣草地上部和根系C、N、P、K元素计量比的内稳性高于元素本身,C、N(稳态型)内稳性高于P(弱稳态型)。In order to explore the characteristics of ecological stoichiometric changes of dominant herbaceous plants under the spruce forest,a dominant herbage Alchemilla tianschanica occurring in the north slope of Tianshan Mountain,Xinjiang,with the altitudes ranged from 2000 to 2800 m was selected.The contents of carbon,nitrogen,phosphorus,and potassium in aboveground parts,roots and soil were measured.The ecological stoichiometric characteristics and internal stability were analyzed.The results showed that 1)the nutrient contents in the aboveground part at low-altitude area were higher than those at high-altitude area;the nutrient contents in roots at high-altitude area were higher than those at the low-altitude area.The soil nutrient contents at the altitudes 2200-2400 m and 2600-2800 m were higher than those at the altitudes 2000-2200 m and 2400-2600 m(P<0.05).2)The ratios of C∶P,C∶K,N∶P,and K∶P of the aboveground parts of A.tianschanica at low-altitude area were larger than those at high-altitude area;the ratios of C∶P,N∶P,K∶P in roots showed a trend of first increasing and then decreasing with the increase in altitude.There was no significant difference in soil element measurement ratios between different altitudes(P>0.05),and showed a trend of higher in low altitude area and lower in high altitude area.3)No significant correlationships of the nutrient chraracteristics were found between the aboveground parts and roots and corresponding soils(P>0.05).4)The internal stabilities of the stoichiometric ratios of C,N,P,and K stoichiometric for the above ground parts were higher than the element itself,while those of C and N(steady-state type)were higher than P(weak steady-state type).

关 键 词：生态化学计量特征 内稳性 天山羽衣草 海拔梯度 

分 类 号：S791.18[农业科学—林木遗传育种]