干热河谷稀树灌丛藤本植物叶片养分重吸收特性  

Leaf nutrient resorption by savanna liana species in a dry-hot valley in Yuanjiang,southwest China

作　　者：李雪楠 李振学[3] 李发文 温韩东 张树斌[2] LI Xuenan;LI Zhenxue;LI Fawen;WEN Handong;ZHANG Shubin(School of Ecology and Environment,Southwest Forestry University,Kunming,Yunnan 650224,China;Key Laboratory of Tropical Forest Ecology,Chinese Academy of Sciences,Mengla,Yunnan 666303,China;Bureau of Yuanjiang National Nature Reserve,Yuanjiang,Yunnan 653300,China;Bureau of Yuanjiang Forestry and Grassland,Yuanjiang,Yunnan 653300,China;Yuanjiang Savanna Ecosystem Research Station,Xishuangbanna Tropical Botanical Garden,Chinese Academy of Sciences,Yuanjiang,Yunnan 653300,China)

机构地区：[1]西南林业大学生态与环境学院,云南昆明650224 [2]中国科学院热带森林生态学重点实验室,云南勐腊666303 [3]云南元江国家级自然保护区管护局,云南元江653300 [4]元江县林业和草原局,云南元江653300 [5]中国科学院西双版纳热带植物园元江干热河谷生态站,云南元江653300

出　　处：《森林与环境学报》2024年第3期260-266,共7页Journal of Forest and Environment

基　　金：云南省林业和草原局极小种群保护项目“元江干热河谷三个极小种群野生植物物种保护实践”(2021SJ14X-13);云南省中青年学术和技术带头人后备人才项目(202405AC350012)。

摘　　要：为探明我国西南干热河谷地区特殊的植被类型稀树灌丛的养分重吸收规律,选取元江干热河谷的稀树灌丛10种优势藤本植物为研究对象,测定叶片热值、灰分含量、形态性状、成熟叶和凋落叶的氮磷元素含量,计算叶片构建成本,探讨叶片构建成本、叶片性状与氮磷重吸收效率之间的相互关系。结果显示:元江干热河谷稀树灌丛藤本植物叶片的氮磷重吸收效率在不同物种之间存在较大的变异,叶片氮和磷重吸收效率平均值分别为48.0%和46.2%;叶片磷重吸收效率与氮重吸收效率呈显著正相关关系(P<0.05),而氮磷重吸收效率与叶片构建成本、比叶重呈显著负相关关系(P<0.05)。叶片构建成本较低的植物采取较快速的养分周转策略,以提高养分再利用效率;叶片构建成本较高的植物采取较保守的养分利用策略,养分回收效率较低。元江干热河谷的稀树灌丛藤本植物存在生活史策略的分化,以适应长期干热的生境。This study was conducted to measure leaf construction cost,morphological traits,and nitrogen and phosphorus concentrations in green and senesced leaves from 10 woody liana species in a Chinese savanna in southwest China.We analyzed the relationships among leaf construction cost,morphological traits,and nutrient resorption efficiencies.Our findings revealed a large variation in nutrient resorption efficiencies among species,and respective average values of nitrogen and phosphorus resorption efficiency of 48.0%and 46.2%.Phosphorus resorption efficiency correlated positively with nitrogen resorption efficiency across species(P<0.05).Nitrogen and phosphorus resorption efficiencies were significantly negatively correlated with leaf construction cost and leaf mass per area(P<0.05).Plants with lower leaf composition cost tend to increase nutrient resorption efficiencies.In contrast,plants with higher leaf construction cost reflect more conservative nutrient utilization strategies and lower nutrient resorption efficiencies.Our results suggest a divergence in growth history strategies,reflecting a slow-fast continuum of growth among Chinese savanna liana species growing in persistently dry and hot habitats.

关 键 词：干热河谷 稀树灌丛 藤本植物 养分重吸收效率 叶片构建成本 比叶重 

分 类 号：Q948[生物学—植物学]