干热河谷稀树灌丛优势植物叶片热值及养分特征  

Caloric value and nutrients in the leaves of dominant savanna plant species in Yuanjiang dry-hot valley

作　　者：杨春勐 张树斌[1,2] 陈爱国[1,2] 杨大新 YANG Chunmeng;ZHANG Shubin;CHEN Aiguo;YANG Daxin(Key Laboratory of Tropical Forest Ecology, Chinese Academy of Sciences, Mengla, Yunnan 666303, China;Yuanjiang Savanna Ecosystem Research Station, Xishuangbanna Tropical Botanical Garden,Chinese Academy of Sciences, Yuanjiang, Yunnan 653300, China)

机构地区：[1]中国科学院热带森林生态学重点实验室,云南勐腊666303 [2]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》2019年第1期54-60,共7页Journal of Forest and Environment

基　　金：国家自然科学基金项目(31600479);中国科学院"西部之光"项目

摘　　要：为了解我国西南干热河谷地区特殊生境下稀树灌丛的热值和养分特征,探讨该地区不同生活型植物的热值和养分的差异,以云南省元江干热河谷稀树灌丛8种优势植物为研究对象,观测其热值、灰分及养分特征。结果表明:元江干热河谷8种优势植物叶的去灰分热值平均值为20.21 k J·g-1,其大小顺序为细基丸>白皮乌口树>心叶木>厚皮树>虾子花>马松子>扭黄茅>锈色蛛毛苣苔。不同生活型中,去灰分热值为乔木(21.23 k J·g-1)>灌木(20.56 k J·g-1)>草本(18.84 k J·g-1),灰分含量为草本(40.30%)>乔木(7.74%)>灌木(6.97%)。相关性分析表明,植物热值与全C、全N、全P、全K和全S含量呈极显著正相关(P<0.01),与全Ca和灰分含量呈极显著负相关(P<0.01),说明3种生活型植物的热值与养分密切相关。元江干热河谷植物生长高效的叶片,能够有效利用充足的光照、有限的养分,积累较高的热值,具有较强的适应能力。Eight dominant savanna plant species in the dry-hot valley of the Yuanjiang River,Yunnan Province,were studied to determine their caloric value,ash content,and nutrient characteristics.The results showed that the average gross caloric value(GCV)of these plants was20.21kJ·g-1.The eight dominant plant species in the Yuanjiang River dry-hot valley were ranked based on their GCV in the following order:Polyalthia cerasoides>Tarenna depauperata>Haldina cordifolia>Lannea coromandelica>Woodfordia fruticose>Melochia corchorifolia>Heteropogon contortus>Paraboea rufescens.Among the plants with different life-forms,the GCV was the highest in trees(21.23kJ·g-1),intermediate in shrubs(20.56kJ·g-1),and the lowest in herbs(18.84kJ·g-1),while the ash content was the highest in herbs(40.30%),intermediate in trees(7.74%),and the lowest in shrubs(6.97%).Correlation analyses showed that plant calorific value was significantly positively correlated with the total content of C,N,P,K and S(P<0.01),while it was significantly negatively correlated with the total Ca and ash content(P<0.01).The calorific value of trees,shrubs,and herbs were closely related to their nutrient contents.Sufficient sunlight and limited nutrients can be effectively used by the leaves of plants growing in the dry-hot valley of Yuanjiang to allow them to accumulate high-calorific-value tissues.This demonstrates their strong adaptability,and provides a reference for this area that is important for its ecological recovery.

关 键 词：干热河谷 稀树灌丛 热值 养分 生活型 

分 类 号：S718[农业科学—林学]