川滇高山栎叶片氮磷含量的海拔变化  

Variation of N and P Contents of Quercus aquifolioides Leaves Along Elevation

作　　者：曹向文 张淼淼 陈健[1,2] 史作民 Cao Xiangwen;Zhang Miaomiao;Chen Jian;Shi Zuomin(Key Laboratory of Forest Ecology and Environment of National Forestry and Grassland Administration,Ecology and Nature Conservation Institute,Chinese Academy of Forestry,Beijing 100091,China;Sichuan Miyaluo Forest Ecosystem National Observation and Research Station,Lixian County 623100,China;Co-Innovation Center for Sustainable Forestry in Southern China,Nanjing Forestry University,Nanjing 210037,China)

机构地区：[1]中国林业科学研究院森林生态环境与自然保护研究所,国家林业和草原局森林生态环境重点实验室,北京100091 [2]四川米亚罗森林生态系统国家定位观测研究站,理县623100 [3]南京林业大学南方现代林业协同创新中心,南京210037

出　　处：《陆地生态系统与保护学报》2023年第5期1-9,共9页Terrestrial Ecosystem and Conservation

基　　金：中央级公益性科研院所基本科研业务费专项资金项目(CAFYBB2021ZA002-2);国家重点研发计划(2021YFD2200405);中央级公益性科研院所基本科研业务费专项资金项目(CAFYBB2022SY021);中央级公益性科研院所基本科研业务费专项资金项目(CAFYBB2022QC002)。

摘　　要：【目的】研究川滇高山栎(Quercus aquifolioides)叶片氮和磷含量随海拔的变化规律,了解调控其变化的主要因素,揭示川滇高山栎叶片对环境变化的响应机制,为预测亚高山硬叶常绿阔叶林的环境变化响应提供科学依据。【方法】以青藏高原东南部川滇高山栎林为研究对象,采集不同海拔的川滇高山栎叶片以及0~10 cm表层土,通过元素分析仪和等离子体发射光谱仪测定叶片氮和磷含量,研究叶片氮和磷含量随海拔的变化规律,并结合叶片部分性状特征和土壤理化性质,采用变异分区分析探讨影响叶片氮和磷含量变化的主要因子。【结果】川滇高山栎叶片单位面积氮含量变化在0.25~0.29 mg·cm^(−2)之间,单位质量氮含量变化在11.41~14.82 g·kg^(−1)之间。叶片单位面积磷含量变化在14.83~32.77μg·cm^(−2)之间,单位质量磷含量变化在0.74~1.79 g·kg^(−1)之间。海拔显著影响川滇高山栎叶片氮和磷含量,其中叶片单位面积和单位质量的氮含量均呈现沿海拔升高而下降的趋势,而叶片单位面积和单位质量的磷含量均呈现沿海拔升高而增加的趋势。同时,海拔也显著影响部分叶片性状特征,其中叶鲜重、叶面积和叶密度呈现沿海拔升高而下降的趋势,叶厚呈现沿海拔升高而增加的趋势,叶片含水率和单位面积叶质量未发现明显变化。此外,叶片氮和磷含量随叶片性状变化表现出不同变化趋势,单位质量氮含量随单位面积叶质量、叶厚的增加而下降,随叶密度增加而增加,而单位质量磷含量随单位面积叶质量、叶密度增加而下降。调控叶片氮和磷含量变化的主控因素存在差异,氮含量主要受叶片性状、土壤性质及二者的协同作用共同影响,而磷含量受土壤性质、土壤性质和叶片性状协同作用的影响更大,受叶片性状的独立影响相对较小。【结论】川滇高山栎叶片氮含量随海拔升高而下降,叶�【Objective】The purpose of the study was to analyze the change patterns of Quercus aquifolioides leaf nitrogen and phosphorus characteristics along elevations,to understand the main factors regulating leaf nitrogen and phosphorus changes,to reveal the response mechanism of Q.aquifolioides leaves to environmental changes,and to provide scientific basis for predicting the response to environmental changes in subalpine sclerophyllous evergreen broad-leaved forests.【Method】In this study,Q.aquifolioides forests on the southeastern Qinghai-Tibetan Plateau were used as the research object,and the leaves of Q.aquifolioides and 0~10 cm topsoil at different elevations were collected.The nitrogen and phosphorus contents of the leaves were determined by elemental analyzer and plasma emission spectroscopy.The variation patterns of leaf nitrogen and phosphorus contents along different elevations were studied,and the main factors affecting leaf nitrogen and phosphorus contents were explored using variation partitioning analysis in combination with partial leaf trait characteristics and soil physicochemical properties.【Result】The nitrogen content per unit area of Q.aquifolioides leaves ranged from 0.25~0.29 mg·cm^(−2)and nitrogen content per unit mass ranged from 11.41~14.82 g·kg^(−1).The phosphorus content per unit area of the leaves ranged from 14.83~32.77μg·cm^(−2)and phosphorus content per unit mass ranged from 0.74~1.79 g·kg^(−1).Elevation affected the nitrogen and phosphorus contents of Q.aquifolioides leaves significantly,and the nitrogen content per unit area and per unit mass of leaves decreased with the increase of elevation,while the phosphorus content per unit area and per unit mass showed an increasing trend along with the elevation.Meanwhile,elevation also affected partial leaf trait characteristics significantly.Leaf fresh mass,leaf area and leaf density showed a decreasing trend along the elevation,and leaf thickness showed an increasing trend along the elevation.Leaf moisture and leaf mas

关 键 词：海拔 叶片养分 空间异质性 土壤性质 青藏高原 川滇高山栎 

分 类 号：S718.5[农业科学—林学]