黄土丘陵沟壑区不同林龄刺槐林养分特征与生物量研究  

Nutrients and Biomass of Different-aged Robinia pseudoacacia Plantations in the Loess Hilly Region

作　　者：李靖[1] 马永禄[1] 罗杰[1] 李红[2] 罗志斌[1,3] 

机构地区：[1]西北农林科技大学生命科学学院,陕西杨陵712100 [2]西北农林科技大学植物保护学院,陕西杨陵712100 [3]西北农林科技大学林学院,陕西杨陵712100

出　　处：《西北林学院学报》2013年第3期7-12,共6页Journal of Northwest Forestry University

基　　金：国家重点基础研究发展计划("973"计划)项目(2012CB416902);中国科学院知识创新工程重要方向项目(KZCX2-YW-443);教育部新世纪优秀人才支持计划项目(NCET-08-0468)

摘　　要：以农田为对照,分析了黄土丘陵沟壑区不同林龄人工刺槐林表层土壤有机碳、氮、磷、钾含量、林木根茎叶中N、P、K含量和生物量。结果表明,各林龄刺槐林土壤有机碳、全氮和全钾含量均高于农田地,土壤有机碳和全氮含量依次为15a>20a>10a>5a;全钾含量为20a>15a>5a>10a。农田地全磷含量是各林龄刺槐林地磷含量的3.2～3.9倍。刺槐根和叶中N、P含量随着林龄的增加而增加,K含量则表现出相反趋势;茎中N、P、K含量变化不大。不同林龄刺槐生物量的器官分配比例虽有所不同,但均以茎所占的比例最大,根次之,叶最小。可见在造林15a后,该地区土壤养分情况得到了明显的改善。To investigate nutrient status of different-aged Robinia pseudoacacia plantations in the Loess hilly region of China,soil organic carbon（SOC）,total nitrogen（N）,phosphorus（P） and potassium（K） in soils and in root,stem and leaf tissues,and plant biomass were analyzed.SOC contents,soil N and K concentrations were higher under the plantations compared to those in the farmland.The order of SOC and soil N concentrations was 15 a20 a10 a5a and of soil K was 20 a15 a5 a10 a.Soil P concentration of the farmland was 3.2 to 3.9 times higher than those of plantations.Concentrations of N and P in roots and leaves elevated with the increases of the age of plantations,but the opposite pattern was found for K concentrations in roots and leaves.Concentrations of N,P and K in stem remained unchanged across different-aged plantations.Among biomass of different tissues in different-aged plantations,the order of biomass allocation was stemsrootsleaves.These results indicate that afforestation significantly improves soil nutrients.

关 键 词：人工刺槐林 土壤养分 营养元素 生物量 黄土丘陵区 

分 类 号：S792.26[农业科学—林木遗传育种]