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Biogeochemical cycle within ecosystem of Chinese fir plantations Ⅰ: Dynamics of nutrients returning to ecosystem(PDF)

Chinese Journal of Applied & Environmental Biology[ISSN:1006-687X/CN:51-1482/Q]

Issue:
2000 Vol.06 No.2
Page:
127-132
Research Field:
Reviews
Publishing date:

Info

Title:
Biogeochemical cycle within ecosystem of Chinese fir plantations Ⅰ: Dynamics of nutrients returning to ecosystem
Author(s):
FAN Houbaoet al.
Keywords:
Keywords Chinese fir plantation biogeochemical cycle litter leaching by precipitation seasonal dynamics
CLC:
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PACS:
DOI:
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DocumentCode:

Abstract:
Abstract Chemistry of litter and rain fall was monitored for three years (1994~1996) at two sites established in Chinese fir (Cunninghamia lanceolata ) plantations with different stand ages and densities in Nanping, Fujian. The annual litter in 16-year-old stand of 2 370 stems per hm-2 (designated as FFC) and 41-year-old stand of 1 180 stems per hm2 (designated as XQF) were 6 210.7 kg hm-2 and 3 146.2 kg hm-2, with fallen leaves accounting for 76% and 68%, respectively. The quantities of five macronutrients transferred to forest floor by litterfall were 173.92 kg hm-2 and 84.20 kg hm-2 a-1, respectively, decreasing in the order of Ca>N>Mg>K>P, which exhibited two peaks in April and November. Rainfall was significantly enriched through forest canopies in the both sites. Nutrient concentrations in rainfall, throughfall and stemflow exhibited strong seasonal patterns, consistently with minimal values in summer months, intermediate in spring and fall, and maximal in winter, which appeared to be affected greatly by precipitation amount. Annual leaching amounts of five macronutrients by rainwater was 173.33 kg hm-2 at FFC site, and 107.53 kg hm-2 at XQF site, in descending order of K>Ca>Mg. Negative values for nitrogen at both sites and for phosphorus at FFC site suggested that these two elements of nutrients were absorbed directly by tree crowns during precipitation period. Fig 5, Tab 4, Ref 15

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Last Update: 2002-11-04