摘要
在综合分析人工纯林土壤退化过程和原因的基础上,尝试性地提出了土壤性质极化的新概念,即由于单一树种的长期连续生长或连栽,使土壤性质偏离原平衡态并朝某个方向非平衡或极端化发展的趋势,且认为它是造成人工纯林连栽障碍的根本原因;建立单指标和综合指标的土壤极化指数模型,提出人工纯林土壤极化程度的分级标准和分类体系,并应用该模型研究了黄土高原南部残塬沟壑区刺槐(Robinia pseu-doacaciaL.)人工纯林的土壤性质极化问题,结果表明其属于旱化兼贫养化极化类型。
A new concept of soil polarization was presented and defined as the non-equilibrium or polarizing tendency of soil development that deviated from its original status of equilibrium due to long-term or continuous growth of the same single specie of trees, which was thought to be the fundamental obstacle to continuous growing of planted pure-forest. Based on this principle, both single and comprehensive index models were established, and criteria for gradation and a system for classification of soil polarization were also planned out. In addition, these models were applied to a case study of planted pure forest of black locust （ Robinia pseudoacacia L. ） in a gullied area, south in the Loess Plateau. Results show that the soil therein fails in the polarization category of aridification plus sterilization.
出处
《土壤学报》
CAS
CSCD
北大核心
2007年第6期1119-1126,共8页
Acta Pedologica Sinica
基金
国家自然科学基金项目(30471376)
西北农林科技大学人才计划项目(2005)资助
关键词
人工林
土壤退化
土壤极化
连栽障碍
Artificial forest
Soil degradation
Soil polarization
Obstacle to continuous planting
