|本期目录/Table of Contents|

[1]樊后保,苏兵强.杉木人工林生态系统的生物地球化学循环Ⅰ:养分归还动态[J].应用与环境生物学报,2000,6(02):127-132.
 FAN Houbao,et al..Biogeochemical cycle within ecosystem of Chinese fir plantations Ⅰ: Dynamics of nutrients returning to ecosystem[J].Chinese Journal of Applied & Environmental Biology,2000,6(02):127-132.
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杉木人工林生态系统的生物地球化学循环Ⅰ:养分归还动态()
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《应用与环境生物学报》[ISSN:1006-687X/CN:51-1482/Q]

卷:
6卷
期数:
2000年02期
页码:
127-132
栏目:
综述
出版日期:
2000-04-25

文章信息/Info

Title:
Biogeochemical cycle within ecosystem of Chinese fir plantations Ⅰ: Dynamics of nutrients returning to ecosystem
作者:
樊后保苏兵强
Author(s):
FAN Houbaoet al.
关键词:
关键词 杉木人工林 生物地球化学循环 凋落物 降水淋溶 季节动态
Keywords:
Keywords Chinese fir plantation biogeochemical cycle litter leaching by precipitation seasonal dynamics
摘要:
摘要 在福建南平地区,对林龄和密度不同的两片杉木人工林的凋落物和森林降水化学进行了3 a(1994~1996)的定位研究.株密度n=2 370 hm-2的16 a生林分(标记为FFC)和株密度n=1 180 hm-2的41 a生林分(标记为XQF)的年凋落量分别为6 210.7 kg hm-2和3 146.2 kg hm-2,其中落叶分别占总重量的76%和68%.凋落物中5种主要营养元素的年归还量分别为173.92 kg hm-2和84.20 kg hm-2,其数量大小顺序均为Ca>N>Mg>K>P,并在4月份和11月份出现两次峰值.在两监测样地,降水通过林冠后养分富集现象均十分明显.降雨、穿透雨和树干径流中养分浓度呈现显著的季节变化,均以夏季最低,冬季最高,春秋季居中,这种格局强烈受降雨量的控制.在两林分中降水引起的5种元素的年淋溶量分别为173.33 kg hm-2和107.53 kg hm-2,大小顺序为K>Ca>Mg,而N(及FFC的P)出现负值,表明其被林冠层直接吸收.林龄和密度对生态系统的养分归还具有重要影响.图5 表4 参15
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

相似文献/References:

[1]樊后保,苏兵强,林德喜,等.杉木人工林生态系统的生物地球化学循环Ⅱ:氮素沉降动态[J].应用与环境生物学报,2000,6(02):133.
 FAN Houbao,et al..Ⅱ: Dynamics of nitrogen deposition[J].Chinese Journal of Applied & Environmental Biology,2000,6(02):133.

更新日期/Last Update: 2002-11-04