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生态学杂志 ›› 2012, Vol. 31 ›› Issue (11): 2709-2715.

• 研究报告 • 上一篇    下一篇

森林土壤动物对凋落物早期分解及养分释放的影响

崔洋1,2,3,汪思龙1,2**,于小军2,颜绍馗1,2   

  1. (1中国科学院沈阳应用生态研究所森林与土壤生态国家重点实验室, 沈阳 110164; 2湖南会同森林生态系统国家野外科学-观测研究站, 湖南会同 418307; 3中国科学院研究生院, 北京 100049)
  • 出版日期:2012-11-10 发布日期:2012-11-10

Effects of forest soil fauna on early-stage litter decomposition and nutrient release.

CUI Yang1,2,3, WANG Si-long1,2**, YU Xiao-jun2, YAN Shao-kui1,2   

  1. (1Huitong Experimental Station of Forest Ecology, State Key Laboratory of Forest and Soil Ecology, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110164, China; 2Huitong National Research Station of Forest Ecosystem, Huitong 418307, Hunan, China; 3Graduate University of Chinese Academy of Sciences, Beijing 100049, China)
  • Online:2012-11-10 Published:2012-11-10

摘要: 采用野外缩微实验方法,研究了会同林区常绿阔叶林和杉木人工林土壤动物对凋落物早期分解的影响。结果表明:孔径为2 mm的网筒内试验土壤和凋落物中大型土壤动物的类群数和多度均明显少于孔径为4 mm的网筒;排除大型土壤动物后,常绿阔叶林中凋落物C、K、Ca、Mg养分浓度显著增加,杉木林中凋落物Mg浓度显著增加,2个样地中的凋落物失重率以及凋落物C、P、Ca、Mg等养分元素的释放率均极显著降低(P<0.01);大型土壤动物对不同元素释放率的影响不同,2个样地中对凋落物Ca、Mg元素释放率的影响均较大,杉木人工林中对N和K释放率的影响较小,常绿阔叶林中对P释放率的影响最小。

关键词: 降水事件, 人工固沙植被区, 氢氧稳定同位素, 土壤水分, 水分来源

Abstract: A field microcosm experiment was conducted to study the effects of soil fauna on the earlystage litter decomposition in an evergreen broadleaf forest and a Cunninghamia lanceolata plantation in Huitong of Hunan, South-central China. The taxonomic diversity and abundance of soil macrofauna in the litters and soils were obviously lower in 2 mm mesh nylon net than in 4 mm mesh nylon net. After the exclusion of soil macrofauna, the C, P, Ca, and Mg concentrations in the litters in evergreen broadleaf forest and the Mg concentration in the litters in C. lanceolata plantation increased significantly, while both the mass loss rate and the nutrient release rates of the litters decreased significantly. Soil macrofauna had different effects on the release rates of different nutrients in the litters, with larger effects on the release rates of the litter Ca and Mg in evergreen broadleaf forest and C. lanceolata plantation, lesser effects on the release rates of N and K in C. lanceolata plantation, and least effects on the release rate of P in evergreen broadleaf forest.

Key words: precipitation events, artificial sand-fixation region, hydrogen and oxygen stable isotopes, soil moisture, water sources.