应用生态学报2017，Vol.28Issue(3)：739-747,9.DOI:10.13287/j.1001-9332.201703.030
古尔班通古特沙漠南缘不同林龄人工梭梭林主林层和更新层特征
Characteristics of main layer and regeneration layer of Haloxylon ammodendron plantations at different ages on the southern edge of the Gurbantunggut Desert, Northwest China
摘要
Abstract
The population structure characteristics,natural regeneration,and the influential factors of Haloxylon ammodendron plantations at six different stand ages on the southern edge of the Gurbantunggut Desert were studied.The results showed that H.ammodendron plantation at the stand age of 7 could naturally regenerate.At the stand age of 17,the densities of the seedlings (＜30 cm height),saplings (30≤H＜50 height),and small trees (≥50 cm height) reached optimal class,and the mean height and base diameter of the small tress reached 1.10 m and 1.91 cm,respectively.The parent trees in H.ammodendron plantation at the stand age of 20 grew best.The height of 35％ individuals grew up to 2.50-3.00 m,and the basal stem diameter of 23.1％ individuals grew up to 8.00-10.00 cm.The height and diameter growth of the parent trees in H.ammodendron plantation at the stand age of 33 apparently declined,but the regeneration ability by natural seed dispersal was still strong.The regeneration density of natural seed dispersal showed the greatest correlation with the available nitrogen content in 0-100 cm soil layer (0.87),followed by the soil rapidly available phosphorus content (0.84) and the soil water content (0.79).The soils with pH 8.1-8.6 did not limit the nutrient growth of the regeneration layer.In the main stand layer,the individual density of whole regeneration layer showed the greatest correlation with the biomass of the parent trees (0.77),while the density of regeneration layer of the small trees showed the greatest correlation with the planting density (0.71) and the age of the parent trees (0.70).关键词
梭梭人工林/主林层/更新层Key words
Haloxylon ammodendron plantation/main stand layer/regeneration layer引用本文复制引用
陈启民,罗青红,宁虎森,赵成义,段文标..古尔班通古特沙漠南缘不同林龄人工梭梭林主林层和更新层特征[J].应用生态学报,2017,28(3):739-747,9.基金项目
本文由“十二五”国家科技支撑计划项目(2012BAD16B03)、国家重大基础研究发展计划项目(2013CB429905)和公益性科研院所基本科研业务费专项(XMBM000002014,KY201516)资助 This work was supported by the National'the 12th 5-year-plan'Key Science and Technology Support Program (2012BAD16B03),the Key Project of National Programs for Fundamental Research and Development (2013CB429905),and the Basic Scientific Research Fund for the Public Welfare Scientific Research Institute(XMBM000002014,KY201516). （2012BAD16B03）
