Journal of University of Chinese Academy of Sciences >
Nitrogen Dynamics of Reforested Soils FollowingAgricultural Abandonment over Decades
Received date: 2003-05-06
Online published: 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
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.
TIAN Kun , RICHTER D. D , HEINE P. R , HOFMOCKEL M , YANG Yong-Xing . Nitrogen Dynamics of Reforested Soils FollowingAgricultural Abandonment over Decades[J]. Journal of University of Chinese Academy of Sciences, 2004 , 21(2) : 241 -247 . DOI: 10.7523/j.issn.2095-6134.2004.2.014
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