Litter removal in a tropical rain forest reduces fine root biomass and production but litter addition has few effects

被引：33

作者：

Rodtassana, C. ^{[1
,2
]}

Tanner, E. V. J. ^{[1
,3
]}

机构：

[1] Univ Cambridge, Dept Plant Sci, Downing St, Cambridge CB2 3EA, England

[2] Chulalongkorn Univ, Dept Bot, Fac Sci, Bangkok 10330, Thailand

[3] Smithsonian Trop Res Inst, Apartado 0843-03092, Balboa, Panama

来源：

ECOLOGY | 2018年 / 99卷 / 03期

基金：

美国安德鲁·梅隆基金会;

关键词：

fine root dynamics; litter-addition; litterfall; litter-removal; nitrogen; Panama; tropical forest; NET PRIMARY PRODUCTIVITY; NUTRIENT LIMITATION; SOIL CARBON; ALLOCATION; GROWTH; AVAILABILITY; PHOSPHORUS; MOUNTAINS; WATER;

D O I：

10.1002/ecy.2143

中图分类号：

Q14 [生态学（生物生态学）];

学科分类号：

071012 ; 0713 ;

摘要：

Many old-growth lowland tropical rain forests are potentially nutrient limited, and it has long been thought that many such forests maintain growth by recycling nutrients from decomposing litter. We investigated this by continuously removing (for 10yr) freshly fallen litter from five (45mx45m) plots, adding it to five other plots, there were five controls. From monthly measures over 1 yr we show that litter removal caused lower: fine root (2mm diameter) standing mass, fine root standing length, fine root length production and fine root length survivorship. Litter addition did not significantly change fine root mass or length or production. Nutrient concentrations in fine roots in litter removal plots were lower than those in controls for nitrogen (N), calcium (Ca) and magnesium (Mg), concentrations in fine roots in litter addition plots were higher for N and Ca. Chronic litter removal has resulted in reduced forest growth due to lack of nutrients, probably nitrogen. Conversely, long-term litter addition has had fewer effects.

引用

页码：735 / 742

页数：8

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