DAI Songjia,ZHOU Chenni,DUAN Fei,et al.Effects of Compontents and Habitat Differences on Litter Production and Decomposition of the Primeval Abies georgei Forest in Southeastern Tibet[J].Northern Horticulture,2020,44(23):80-87.[doi:10.11937/bfyy.20200540]
组分和生境差异对藏东南原始冷杉林凋落物产量及分解的影响
- Title:
- Effects of Compontents and Habitat Differences on Litter Production and Decomposition of the Primeval Abies georgei Forest in Southeastern Tibet
- Keywords:
- Southeast Tibet; annual yield of litter; Abies georgei var. Smithii forest; components; habitats
- 文献标志码:
- A
- 摘要:
- 以藏东南急尖长苞冷杉(Abies georgei var.Smithii)凋落物为试材,采用网袋分解法,研究了不同组分凋落物的生产动态特征,以及不同组分及生境条件下凋落物分解特征,以期为深入了解高海拔高寒环境下森林生态系统物质循环过程提供基础数据和参考依据。结果表明:藏东南原始冷杉林凋落物年生产量为(3 555.95±256.79)kg?hm-2,凋落叶产量((1 939.17±84.65)kg?hm-2)>凋落枝产量((1001.27±46.98)kg?hm-2)>其它凋落物组分产量((615.51±26.74)kg?hm-2),凋落物量在月份和组分间差异均极显著;不同组分凋落物分解速率大小顺序为纯叶样(2.21%)>自然样(2.17%)>纯枝样(1.70%),不同生境条件下凋落物分解速率大小顺序为林内(2.17%)>林外(1.94%)>林缘(1.93%);不同组分条件下自然样、纯叶样、纯枝样凋落物分解50%需要的时间为2.11、2.34、3.08年,分解95%需要的时间为8.96、10.02、13.18年;不同生境条件下(林内、林外、林缘)凋落物分解50%需要的时间为2.11、2.52、2.34年,分解95%需要的时间为8.96、10.01、10.84年。
- Abstract:
- Taking the litterfalls of Abies georgei var.Smithii in Southeast Tibet as the test material,the production dynamic characteristics of different components and the decomposition characteristics of litters under different components and habitat conditions were studied by litter decomposition bag methods.The purpose of this study was to provide basis data and theoretical foundation for in-depth understanding of the material cycle process of forest ecosystem in high altitude and cold environment.The results showed that,the annual yield of litter in the original fir forest in Southeastern Tibet was (3 555.95±256.79)kg?hm-2,yield of leaves((1 939.17±84.65)kg?hm-2)>yield of branches((1 001.27±46.98)kg?hm-2)>yield of others((615.51±26.74)kg?hm-2).The yield of litters were significantly different in month and component.The decomposition rate of litters of different components was in the order of leaf-sample(2.21%)>natural sample(2.17%)>branch sample(1.70%).The decomposition rate of litters under different habitat conditions was in the order of IF(2.17%)>OF(1.94%)>BF(1.93%).Under the condition of different components,50% of the decomposition time of litters of natural sample,leaf sample and branch sample were 2.11,2.34 and 3.08 years,and 95% of the decomposition time were 8.96,10.02 and 13.18 years;under different habitat conditions (IF,OF and BF),50% of the decomposition time of litters were 2.11,2.52 and 2.34 years,and 95% of the decomposition time were 8.96,10.01 and 10.84 years.
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备注/Memo
第一作者简介:代松家(1983-),男,博士研究生,研究方向为高原生态学。E-mail:daisongjia@163.com.责任作者:龙春林(1964-),男,博士,教授,现主要从事民族植物学等研究工作。E-mail:long.chunlin@muc.edu.cn.基金项目:西藏自治区重大科技专项资助项目(XZ201901-GA-08);西藏自治区科学技术厅-西藏农牧学院厅校联合基金资助项目(XZ2019ZR-G-70)。收稿日期:2020-02-16