摘要
了解色季拉木本植物在山地垂直气候带下化学计量变化特征,以期为有效地反映和评价森林生态系统植物养分的空间分配状况提供科学依据。以色季拉山4种典型气候带,即山地暖温带、山地温带、亚高山寒温带、高山寒带的12种木本植物为研究对象,采用方差分析及化学计量比等方法,探讨叶、枝、干、根器官间养分及化学计量特征在垂直气候带上的变化规律。结果显示:(1)各器官C、N、P、K元素含量表现为叶>枝>根>干,其中叶与干各元素含量整体均呈上升趋势,枝含量整体呈下降趋势,根含量呈波动式变化。(2)在山地垂直气候带下受温度的影响,使得高寒生境下植物叶N、P含量相对较高,促进了植物的驯化与适应,符合“温度-植物生理假说”。(3)小于10的N︰P、N︰K,与大于3.4的K︰P表明色季拉木本植物的生长受N、P共同限制。(4)C︰N、C︰P、C︰K与N、P、K含量均呈极显著负相关,表明该区域植物生长速率偏低,且生长速率与N、P含量呈显著正相关。结果表明,由海拔引起的环境差异调节着山地垂直气候带下植物养分含量及化学计量比。
To understand the characteristics of stoichiometric changes of woody plants in Sejila under the mountain vertical climate zones,and provide a scientific basis for effective response and evaluation of the spatial distribution of plant nutrients in forest ecosystems,12 species of woody plants in four typical climatic zones in the Sejila Mountains,namely,the mountain warm temperate zone,the mountain temperate zone,the subalpine cold temperate zone and the alpine cold zone,were used to explore the variation patterns of nutrient and stoichiometric characteristics among leaf,branch,stem and root organs in the vertical climatic zones by using ANOVA and stoichiometric ratios.The results showed that:(1)The elemental contents of C,N,P and K in each organ showed a trend of leaf>branch>root>stem,among which the elemental contents of both leaf and stem showed an overall increasing trend;the overall contents of branch showed a decreasing trend;the contents of root showed fluctuating changes.(2)Under the influence of temperature in the vertical climate zone of the mountains,the leaf N and P contents of plants in alpine habitats were relatively high,which promotes the domestication and adaptation of plants,in line with the“temperature-plant physiological hypothesis”.(3)N︰P and N︰K ratios less than 10 and K︰P ratios greater than 3.4 indicated that the growth of Sejila woody plants is limited by both N and P.(4)Correlation analysis showed that C︰N,C︰P,and C︰K ratios were highly significantly negatively correlated with N,P,and K contents,indicating that plant growth rate was low in this region,and growth rate was significantly and positively correlated with N and P contents.The results indicate that environmental differences caused by altitude regulate plant nutrient contents and stoichiometric ratios under the vertical climate zone of the mountain.
作者
李月瑶
李江荣
陈文盛
丁慧慧
付芳伟
肖思颖
LI Yue-yao;LI Jiang-rong;CHEN Wen-sheng;DING Hui-hui;FU Fang-wei;XIAO Si-ying(Institute of Plateau Ecology,Xizang Academy of Agriculture and Animal Husbandry,Linzhi Xizang 860000,P.R.China;Key Laboratory of Forest Ecology,Ministry of Education,Xizang Plateau,Linzhi Xizang 860000,P.R.China;National Field Scientific Observation and Research Station of Alpine Forest Ecosystem,Linzhi Xizang 860000,P.R.China;Key Laboratory of Ecological Security of Alpine Vegetation,Xizang Autonomous Region,Linzhi Xizang 860000,P.R.China)
出处
《西部林业科学》
CAS
北大核心
2023年第1期156-164,共9页
Journal of West China Forestry Science
基金
2019年西藏林芝森林生态站辐射基准站与冻土自动检测系统建设(502219001)
科技部国家野外科学观测研究站(生态系统)运行补助项目“西藏林芝高山森林生态系统国家野外科学观测研究(2020—2025)”。
关键词
养分元素
器官
气候带
化学计量
nutrient elements
organs
climatic zones
stoichiometry
