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不同林龄杉木人工林凋落物持水特性研究 被引量:4

Water Holding Characteristics of Litters in Different-aged Cunninghamia lanceolata Plantations
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摘要 结合取样法与浸泡法,对湖南会同不同林龄杉木(Cunninghamia lanceolata)人工林凋落物现存量、凋落物(叶和枝)持水特性进行研究。结果表明,凋落物现存量表现为成熟林(2.72 t/hm^2)>近熟林(2.36 t/hm^2)>中龄林(1.26 t/hm^2)。叶凋落物最大持水量表现为成熟林(5.50 t/hm^2)>近熟林(4.49 t/hm^2)>中龄林(2.20 t/hm^2);枝凋落物最大持水量表现为近熟林(1.20 t/hm^2)>成熟林(1.09 t/hm^2)>中龄林(0.27 t/hm^2)。叶凋落物最大持水率表现为中龄林(241.37%)>近熟林(224.80%)>成熟林(208.17%);枝凋落物最大持水率表现为成熟林(148.63%)>近熟林(107.37%)>中龄林(81.80%)。叶凋落物最大吸水速率表现为中龄林(3.54 g·g^-1·h^-1)>近熟林(3.06 g·g^-1·h^-1)>成熟林(2.79 g·g^-1·h^-1);枝凋落物最大吸水速率表现为近熟林(1.92 g·g^-1·h^-1)>成熟林(1.74 g·g^-1·h^-1)>中龄林(1.44 g·g^-1·h^-1)。叶、枝凋落物持水量和持水率与浸泡时间呈对数关系,吸水速率与浸泡时间呈幂函数关系,叶凋落物的持水量与持水率均明显高于枝凋落物,其在持水能力方面起主要作用。研究结果可为评价我国南方杉木人工林水土保持功能与可持续经营提供科学依据。 By combining methods of field investigation and soaking extraction,litter standing crop and water holding characteristics of litters(branches and leaves)of Cunninghamia lanceolata plantations with different ages were examined in Huitong county,Hunan province.Results showed that the order of litter standing crop was mature forest(2.72 t/hm^2)>near-mature forest(2.36 t/hm^2)>middle-aged forest(1.26 t/hm^2).The order of maximum water holding capacity of leaf litters was mature forest(5.50 t/hm^2)>near-mature forest(4.49 t/hm^2)>middle-aged forest(2.20 t/hm^2).The order of water holding capacity of branch litters was near-mature forest(1.20 t/hm^2)>mature forest(1.09 t/hm^2)>middle-aged forest(0.27 t/hm^2).The order of maximum retention rate of leaf litters was middle-aged forest(241.37%)>near-mature forest(224.80%)>mature forest(208.17%).The order of maximum retention rate of branch litters was mature forest(148.63%)>near-mature forest(107.37%)>middle-aged forest(81.80%).The order of maximum water absorption rate of leaf litters was middle-aged forest(3.54 g·g^-1·h^-1)>near-mature forest(3.06 g·g^-1·h^-1)>mature forest(2.79 g·g^-1·h^-1).The order of maximum water absorption rate of branch litters was near-mature forest(1.92 g·g^-1·h^-1)>mature forest(1.74 g·g^-1·h^-1)>middle-aged forest(1.44 g·g^-1·h^-1).The water holding capacity and retention rate of litters had logarithmic relationship with immersion time.Water absorption rate of litters had quadratic relationship with immersion time.Water holding capacity and retention rate of leaf litters were significantly higher than those of branch litters,so leaf litters played a major role in water holding ability.This study would provide theoretical basis for evaluating soil and water conservation function and sustainable management of C.lanceolata plantations in southern China.
作者 夏璟钰 王雯颖 蒋林君 钟翔 刘龙 徐传洪 欧阳帅 Xia Jingyu;Wang Wenying;Jiang Linjun;Zhong Xiang;Liu Long;Xu Chuanhong;Ouyang Shuai(Faculty of Life Science and Technology,Central South University of Forestry and Technology,Changsha,Hunan 410004,China;Huitong National Field Station for Scientific Observation and Research of Chinese Fir Planation Ecosystem in Hunan,Huitong 438107,China)
出处 《广西林业科学》 2019年第4期449-454,共6页 Guangxi Forestry Science
基金 2018年度湖南省大学生创新创业训练计划项目“不同年龄阶段杉木人工林凋落物生态水文功能研究” 2018年度湖南省大学生普通高等学校教学改革研究项目“科研反哺教学在生态学教学中的创新实践研究”
关键词 杉木 凋落物现存量 持水量 持水率 吸水速率 Cunninghamia lanceolata litter standing crop water holding capacity retention rate water absorption rate
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