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生态学杂志 ›› 2011, Vol. 30 ›› Issue (07): 1429-1434.

• 研究报告 • 上一篇    下一篇

桂西北喀斯特区原生林与次生林凋落物储量及持水特性

曾昭霞1,3**,刘孝利2,王克林1,3,曾馥平1,3,宋同清1,3   

  1. 1中国科学院亚热带农业生态过程重点实验室, 中国科学院亚热带农业生态研究所, 长沙 410125;2湖南农业大学资源环境学院, 长沙 410128;3中国科学院环江喀斯特农业生态系统研究观测站, 广西环江 547200
  • 出版日期:2011-07-08 发布日期:2011-07-08

Litter standing biomass and water-holding characteristics in typical primary and secondary forests in karst region of northwest Guangxi.

ZENG Zhao-xia1,3**, LIU Xiao-li2, WANG Ke-lin1,3, ZENG Fu-ping1,3, SONG Tong-qing1,3   

  1. 1Key Laboratory of Agro-Ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China; 2College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China; 3Station of Karst Ecology in Huanjiang, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Huanjiang 547200, Guangxi, China
  • Online:2011-07-08 Published:2011-07-08

摘要: 对桂西北典型喀斯特区3种原生林——青檀(Pteroceltis tatarinowii)林、白花檵木(Loropetalum chinensis)林和枫香(Liquidambar formosana)林与3种次生林——圆叶乌桕(Sapium rotundifolium)、八角枫(Alangium chinense)和黄荆(Vitex negundo)的凋落物储量、持水量、持水率及凋落物吸水速率进行了比较。结果表明,八角枫林的凋落物储量(3.3 t·hm-2)最大,其次为圆叶乌桕和枫香林(3.2和2.9 t·hm-2),青檀林最小(1.8 t·hm-2)。不同林型的凋落物持水量大小依次为八角枫>白花檵木>黄荆>圆叶乌桕>枫香>青檀。青檀、白花檵木、枫香、圆叶乌桕、八角枫和黄荆林的凋落物最大持水率分别为301%342%、224%、253%、288%和328%。凋落物的持水量及持水率随浸泡时间的增加呈对数增长。6种林型中,白花檵木林凋落物的吸水速率最大,黄荆、青檀和八角枫次之,而圆叶乌桕和枫香较小,凋落物的吸水速率随浸泡时间的增长而降低。综合比较得出,研究区次生林凋落物的持水量大于原生林,但原生林凋落物的持水率与吸水速率大于次生林,可见原生林凋落物的累积更具生态水文意义。

关键词: 日光温室, CO2浓度, 日变化, 季节变化, 空间分布, CO2亏缺

Abstract: Taking three typical primary forests wing-hackberry (Pteroceltis tatarinowii), Chinese Loropetal (Loropetalum chinensis),  Beautiful Sweetgum (Liquidambar formosana) and three typical secondary forests round-leaved tallow tree (Sapium rotundifolium), Chinese Alangium (Alangium chinense), and NegundoChaste-tree (Vitex negundo) in karst region of northwest Guanxi, Southwest China as test objects, a comparative study was conducted on the litter standing biomass, water-holding capacity, water-holding rate, and water-absorption rate. Among the test forests, Chinese Alangium had the largest dry litter standing biomass (3.3 t·hm-2), followed by round-leaved tallow tree (3.2 t·hm-2) and Beautiful Sweetgum (2.9 t·hm-2), while wing-hackberry had the least one (1.8 t·hm-2). The litter water-holding capacity in different type forests was in the order of Chinese Alangium > China Loropetal > Negundo Chaste-tree > round
-leaved tallow tree > Beautiful Sweetgum > wing-hackberry, and the litter potential water-holding rate in wing-hackberry, China Loropetal, Beautiful Sweetgum, round-leaved tallow tree, Chinese Alangium, and Negundo Chaste-tree forests was 301%, 342%, 224%, 253%, 288%, and 328%, respectively. The litter water-holding capacity and water-holding rate increased logarithmically with the increasing time of immersed in water. The litter water-absorption rate was the largest in China Loropetal forest, followed by in Negundo Chaste-tree, wing-hackberry, Chinese Alangium, and round-leaved tallow tree forests, and in Beautiful Sweetgum forest. The litter water-absorption rate decreased with time. To sum up, in karst region of northwest Guanxi, the litters in secondary forests had a larger water-holding capacity but smaller water-holding and water-absorption rates than primary forests, suggesting that the accumulation of litters in primary forests was of more eco-hydrological significance, compared with that in secondary forests.

Key words: Solar greenhouse, CO2 concentration, Diurnal change, Seasonal change, Spacial distribution