人工林土壤养分极化动态理论模型  

Theoretical and dynamic models of soil nutrient polarization in planted forests

作　　者：米彩红[1] 刘增文[1,2] 张晓曦[3] 

机构地区：[1]西北农林科技大学资源环境学院,陕西杨凌712100 [2]农业部西北植物营养与农业环境重点实验室,陕西杨凌712100 [3]西北农林科技大学水土保持研究所,陕西杨凌712100

出　　处：《西北农林科技大学学报（自然科学版）》2013年第8期91-95,共5页Journal of Northwest A&F University(Natural Science Edition)

基　　金：国家自然科学基金项目(31070630)

摘　　要：【目的】建立基于人工林土壤养分循环和枯落物分解的土壤极化模型,旨在为深入认识土壤养分极化成因和预测土壤养分极化趋势提供参考。【方法】从人工林生态系统养分循环规律的角度出发,建立人工林土壤养分极化推理和动态模型,通过实验室分解法和野外调查,对模型中主要参数的确定进行分析。【结果】分别建立了基于养分循环和枯落物分解的人工林土壤养分极化度推理模型及动态模型,并针对油松、落叶松、侧柏、刺槐、小叶杨、白桦和辽东栎等人工林,确定了模型中的主要参数。【结论】由于人工林土壤养分极化受林木对养分的选择吸收利用、枯落物分解等的综合影响,所以从人工林生态系统养分循环规律的角度来建立土壤养分极化动态理论模型是可行的。In this research,models of soil nutrient polarization based on soil nutrient circulation were established.And the causes and tendency of soil polarization can be understood deeply by the models.【Method】Theoretical and dynamic models of soil nutrient polarization were developed in view of the nutrient circulation in planted forests.And the main parameters were analyzed by indoor experiment and outdoor survey.【Result】Inferential models and dynamic models of polarization in planted forests based on nutrient cycling or leaf litter decomposition were developed respectively.The parameters such as k,ρ,λ and W of the models were studied in the Pinustabulaeformis,Larix principis-rupprechtii,Platycladus orientalis,Robinia pseudoacacia,Populus simonii,Betula platyphylla and Quercus liaotungensis forests as well.【Conclusion】Soil polarization was synthetically influenced by the selective absorption and utilization of nutrients by trees and the decomposition of litters.Consequently,it is feasible to develop theoretical and dynamic models based on nutrient cycling in planted forest ecosystem.

关 键 词：人工林 土壤养分 土壤极化 

分 类 号：S714.2[农业科学—林学]