干热河谷不同恢复模式下印楝叶内养分转移特征  

Characteristics of Nutrient Transfer in Leaves of Azadirachta Indica Under Different Restoration Patterns in Dry-Hot Valley

作　　者：张婷婷 周玮超琦 唐恋波 高成杰[4] Zhang Tingting;Zhou Weichaoqi;Tang Lianbo;Gao Chengjie(Longcheng Subdistrict Office of Chenggong District,Kunming 650500,Yunan,China;Forest and Grass Information Service Center,Mengzi 661100,Yunan,China;Forest and Grass Service Center of Mingjiu Town,Mengzi 661100,Yunan,China;Institute of Highland Forest Science,Chinese Academy of Forestry,Kunming 650224,Yunan,China)

机构地区：[1]昆明市呈贡区龙城街道办事处,云南昆明650500 [2]蒙自市林草信息服务中心,云南蒙自661100 [3]蒙自市鸣鹫镇林业和草原服务中心,云南蒙自661100 [4]中国林业科学研究院高原林业研究所,云南昆明650224

出　　处：《绿色科技》2024年第23期104-109,115,共7页Journal of Green Science and Technology

摘　　要：植物在干旱贫瘠环境下的养分转移是维持体内养分平衡的重要机制。为了解我国西南干热河谷地区不同恢复模式下造林树种养分转移特征,对元谋干热河谷地区印楝纯林及其与大叶相思混交林中印楝叶片5种养分元素(N、P、K、Ca、Mg)转移特征进行了研究。结果表明,不同恢复模式下印楝叶内N、P、K发生了明显转移,衰老叶片养分含量为绿色叶片的34.71%~59.52%;而Ca和Mg并未发生转移,衰老叶片养分含量为绿色叶片养分含量的1.32~2.26倍。混交林中印楝绿色叶片内N含量显著高于纯林(P<0.05)。纯林中印楝叶内N、P、K、Ca、Mg转移率分别为53.92%、59.85%、45.92%、-126.03%和-13.19%;混交林内分别为65.92%、62.60%、40.19%、-126.65%和-35.18%。混交林中印楝叶内N和P转移率高于纯林,且以N元素达到显著水平(P<0.05)。研究结果强调了选择适宜的混交造林模式能够促进植物的养分利用效率和生态适应性,为干热河谷等生态脆弱区的植被恢复及林分管理提供了重要的理论支持和实践指导。Nutrient resorption in plants is a crucial mechanism for maintaining nutrient balance,particularly in arid and infertile environments.This study investigates the nutrient resorption characteristics of five essential elements(N,P,K,Ca,and Mg)of Azadirachta indica in the pure stand and mixed stand with Acacia auriculiformis in Yuanmou dry-hot valley of southwest China.The results showed significant resorption of N,P,and K in leaves,with nutrient content in senescent leaves being 34.71%to 59.52%of that in green leaves.However,Ca and Mg did not exhibit noticeable resorption,with their content in senescent leaves being 1.32 to 2.26 times higher than in green leaves.The N content in green leaves from mixed stands was significantly higher than that in pure stands(P<0.05).In pure stands,the resorption efficiencies of N,P,K,Ca,and Mg were 53.92%,59.85%,45.92%,-126.03%,and-13.19%,respectively,while in mixed stands,they were 65.92%,62.60%,40.19%,-126.65%,and-35.18%.The resorption efficiencies of N and P in mixed stands were higher than in pure stands,with N showing a significant difference(P<0.05).These findings emphasize that the selection of appropriate mixed afforestation can promote the nutrient use efficiency and ecological adaptability of plants, and provide important theoretical support and practicalguidance for vegetation restoration and stand management in dry-hot valleys.

关 键 词：干热河谷 印楝 养分转移 恢复模式 

分 类 号：S728.2[农业科学—林木遗传育种]