太行山丘陵区不同龄级栓皮栎人工林养分循环特征  

Nutrient cycling in Quercus varlabilis plantations of different ages classes in hilly region of Taihang Mountain

作　　者：赵勇[1] 王鹏飞 樊巍[3] 朱延峰[1] 

机构地区：[1]河南农业大学,450002 [2]河南省建材设计院,450002 [3]河南省林业科学研究院,郑州450003

出　　处：《中国水土保持科学》2009年第4期66-71,共6页Science of Soil and Water Conservation

基　　金："十一五"国家科技支撑项目"华北土石山区植被恢复与重建技术试验示范"(2006BAD03A1102);河南省科技攻关项目"典型退化生态系统恢复;重建机理及生态工程设计示范研究"(0624090010)

摘　　要：为定量分析植被恢复进程的变化特征，以太行山丘陵区的栓皮栎人工林为研究对象，在样方调查的基础上，对其各器官N、P、Ca 3种营养元素的含量、积累、分配和养分循环变化情况进行研究。结果表明：1）不同植物器官中，营养元素含量差异明显；各龄级中，营养元素含量最多的器官是树叶，树干含量最低；营养元素含量的排序为Ca〉N〉P。2）林地土壤有机质、N和P含量随龄级增加呈明显增长趋势，植被恢复能明显加快土壤肥力的提高。3）20-40 a栓皮栎人工林营养元素积累量为2764.58-3689.38 kg/hm^2，年存留量为89.88-138.17 kg/（hm^2·a），归还量为229.80-262.06 kg/（hm^2·a）。随龄级增加，营养元素储存总量随之升高，而存留量反而降低；吸收量和归还量呈现先升高后降低的趋势；不同营养元素的储存量、吸收量、归还量和存留量的大小排列次序均为Ca〉N〉P。4）循环系数和周转时间随龄级增加而升高，利用系数则呈现下降趋势；各元素之间Ca的周转时间最长（12.73-16.19a），利用系数最小。In order to analyze the characteristic of the vegetation restoration process, the characteristic of the content, accumulation, distribution and nutrient cycling of three nutrient elements （N, P, Ca） in Quercus variabilis plantations were studied taking the communities of the sample sites analysis in hilly region of Taihang Mountain as investigation objectors. The results showed that： 1）the nutrient element content in different tree organs is different, the content of three nutrient elements in leaves were the highest , but the lowest in stems. The descending order of nutrient elements contents is as following： Ca, N, P. 2）the content of organic matter and N, P in soil have significantly increased with the plantations ages of Quercus varlabilis, it is concluded that the soil fertility increased with the vegetation restoration process. 3）the total accumulation amount of nutrient elements ranged from 2 764.58 to 3 689.38 kg/hm^2 in the different age stands, annual nutrient elements storage were from 89.88 to 138.17 kg/（hm^2·a）. The return amount of different elements were 229.80, 262.06 and 246.63 kg/（hm^2·a） for 20, 30 and 40 a stands of Quercus variabilis respectively. It shows a increasing trend of the total accumulation amount with stand age. The amount of absorption and return of different elements increased with the stand age at first, and then decreased. The descending order of amount of elements storage, absorbance, return, and accumulation is Ca, N, P. 4） The nutrient use coefficient was decreased with stand age. However, both nutrient cycling coefficient and turnover time were increased with stand age. Ca has the longest turnover period of 12.73 - 16.19 years but the lowest utilization coefficient.

关 键 词：栓皮栎 养分循环 龄级 周转时间 植被恢复 

分 类 号：S661.101[农业科学—果树学] X141[农业科学—园艺学]