沙棘人工林衰败对林地土壤氮矿化速率的影响  

Effects of Degradation of Hippophae rhamnoides Plantation on Soil Nitrogen Mineralization Rate

作　　者：陈金泉[1] 赵忠[1] 李玉新[1] 

机构地区：[1]西北农林科技大学西部环境与生态教育部重点实验室,陕西杨陵712100

出　　处：《西北林学院学报》2011年第2期52-56,共5页Journal of Northwest Forestry University

基　　金：国家"十一五"科技支撑计划项目(2006BAD03A1207)

摘　　要：通过测定和比较不同生长发育阶段(8、131、8 a)沙棘人工林土壤氮矿化速率,结合林分结构和天然更新能力,研究了沙棘林衰败对土壤氮矿化速率的影响,期望为该区沙棘人工林的健康评价和科学经营提供理论依据。结果显示,沙棘人工林健康状况随林龄的增长呈正态曲线变化;土壤氮矿化速率与土层深度呈负相关,与全氮含量和碱解氮含量呈极显著相关;不同发育阶段沙棘人工林土壤氮矿化速率与其健康状况相呼应,且都随林龄的增长呈正态曲线变化;不同林龄土壤氮矿化速率大小依次为:13 a>18 a>8 a。By measuring and comparing soil N mineralization rates of the soils of Hippophae rhamnoides plantation with different growth stages（8 a,13 a,18 a）,combining with the investigation of forest structure and natural regeneration capacity,effects of the degradation of H.rhamnoides plantation on soil nitrogen mineralization rate were studied to provide theoretical basis for the health evaluation and scientific management the plantations.The results showed that the health status of H.rhamnoides plantation was in a normal growth curve with the age.Soil nitrogen mineralization rate showed a negative correlation with the soil depth and a highly significant correlation with the soil total nitrogen,available nitrogen.The soil nitrogen mineralization rates of the plantations at different growth stages were related to their health status,and they both showed a normal curve with the age.The order of soil nitrogen mineralization rate of different growth stages was 13 a 18 a 8 a.

关 键 词：沙棘人工林 土壤氮矿化速率 林分结构 天然更新 

分 类 号：S714.5[农业科学—林学]