岷江上游人工油松林凋落量及其持水特征  

STUDY ON LITTER-FALL AND WATER HOLDING CAPACITY OF LITTER IN AN ARTIFICIAL PINUS TABULAEFORMIS FOREST IN THE UPPER REACHES OF THE MINJIANG RIVER

作　　者：鲍文[1] 包维楷[2] 丁德蓉[1] 何丙辉[1] 

机构地区：[1]西南农业大学资源环境学院,重庆400716 [2]中国科学院成都生物研究所,四川成都610041

出　　处：《西南农业大学学报（自然科学版）》2004年第5期567-571,共5页Journal of Southwest Agricultural University

基　　金：中国科学院知识创新工程重大项目(KSCX1-07-02);"十五"国家重大科技攻关项目(2001BA606A-05);中国科学院"西部之光"项目;中国科学院成都生物研究所茂县山地生态系统定位站共同资助项目

摘　　要：通过对人工油松林凋落量及其持水性动态变化的监测和研究。结果表明,观测期间(2002.9～2003.10)凋落量是5.900t/hm2·a,月凋落量在0.166～1.775t/hm2之间变化,其中以10月凋落最盛,该月占了全年凋落量的30.09%;而凋落最少则出现在5月,本月凋落量仅2.81%。凋落物自然含水量在13.75%～63.62%之间变化,半分解凋落物含水量普遍高于未分解凋落物,但2者月动态变化趋势基本一致;凋落物自然含水量与其饱和持水率也呈现相同的变化趋势,并且2者有较好的拟合关系。未分解和半分解凋落物饱和持水率分别在85.05%～323.41%,147.66%～251.11%之间波动,半分解凋落物饱和持水率变幅相对较小,未分解凋落物呈现明显的"凸"形月变化,半分解凋落物则无明显变化规律。Litter-fall and the water-holding characteristics of litter in a 23-year-old artificial Pinus tabulaeformis Forest were studied from September, 2000 to October, 2003. The results showed that the annual litter-fall was 5.900 t/ha and the monthly litter-fall ranged from 0.166 to 1.775 t/ha. The maximum and minimum of monthly litter-fall occurred in October and May, respectively, accounting for 30.09% and 2.82% of the annual litter-fall. Water content of litter varied from 13.75% to 63.62%, and the water content of the semi-decomposed litter was higher than that of the un-decomposed litter. Water content and saturated water-holding capacity of litter varied in the same pattern and both could be described statistically. The water-holding capacity of semi-decomposed and un-decomposed litter fluctuated between 85.05 and 323.41% and between 147.66% and 251.11%, respectively. The water-holding capacity of un-decomposed litter showed a convex profile in a month while that of semi-decomposed litter did not show any definite pattern of fluctuation.

关 键 词：人工油松林 凋落物 自然含水量 饱和持水率 

分 类 号：S718.553[农业科学—林学]