Nitrogen Dynamics of Reforested Soils FollowingAgricultural Abandonment over Decades

doi:10.7523/j.issn.2095-6134.2004.2.014

›› 2004, Vol. 21 ›› Issue (2): 241-247.DOI: 10.7523/j.issn.2095-6134.2004.2.014

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Nitrogen Dynamics of Reforested Soils FollowingAgricultural Abandonment over Decades

TIAN Kun^{1, 2}, RICHTER D. D², HEINE P. R², HOFMOCKEL M², YANG Yong-Xing¹

1. Northeast Institute of Geography and Agricultural Ecology, Chinese Academy of Sciences, Changchun 130012, China;
2. Nicholas School of Environment, Duke University Durham, NC 27708, USA

Received:2003-05-06 Online:2004-03-19
Supported by:
Supported by Yunnan Education Foundation for studying abroad, and Grants from USDA National Research Initiative and USNSF to Duke University

Abstract

Abstract:

Soil samples archived over four decades were used in an incubation experiment to measure theeffects of reforestation on nitrogen dynamics in old agricultural fields. Samples collected from depths 0cm to 715cm and 35cm to 60cm at intervals ranging between five and nine years since 1962 were incubatedaerobically at 30℃ for 30 days using a system specially designed to maintain constant soil moisture. Mineral N was measured in 2 molPL KCl extracts. The ratio of mineralized N to total N rapidly decreased inthe first two decades of forest development. Within 20 years of planting, 80 % to 90 %of plant available N had accumulated in the biomass indicating that agricultural inputs of N were important to early tree development. Significantly, by age 40, 50 % to 80 % of the original pool of mineral N had returned to thesoil profile. The accretion of mineralizable N suggests that forest floor is serving as an increasingly impor2tant source for this nutrient. Further, it indicates that forest managers have the opportunity to manipulatea large pool of forest organic matter to sustain soil N supply.

Key words: 　reforested soils, incubation, N2mineralization, nitrogen dynamics, long2termCLC S71415

CLC Number:

S714.5

TIAN Kun, RICHTER D. D, HEINE P. R, HOFMOCKEL M, YANG Yong-Xing. Nitrogen Dynamics of Reforested Soils FollowingAgricultural Abandonment over Decades[J]. , 2004, 21(2): 241-247.

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Nitrogen Dynamics of Reforested Soils FollowingAgricultural Abandonment over Decades

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