Full-Text Search:
Home|Journal Papers|About CNKI|User Service|FAQ|Contact Us|中文
《Journal of Northwest Forestry University》 2018-03
Add to Favorite Get Latest Update

Nutrient Accumulation and Biomass Characteristics of Different-aged Natural Forests of Populus euphraticain the Tarim River Basin

WANG Xin-ying;SHI Jun-hui;LIU Mao-xiu;Xinjiang Academy of Forestry Science;Xinjiang Tarim Poplus Riparian Forest Ecosystem Research Station;  
Taking the natural Populus euphratica forests occurring in Tarim River Basin as the study objects,influences of forest age on the biomass and the nutrients were examined by cutting the whole plants of the standard trees and conducting indoor nutrient analysis.The results shows that 1)with the increase of forest age,the biomass of individual tree and of all organs increased;the biomass of the stands increased before decreasing;the distribution ratio of the root biomass reduced while of the trunk biomass increased;the age had an extremely significant influence on the biomass(P0.01).2)The average N content of different organs was in the order of leaf branch roottrunk,while the average P content was rootleaf branchtrunk,and the average K content was leafroot branchtrunk;the highest content of the nutrient element in each organ was N,followed by K and P;the forest age had significant influences on the contents of all the elements examined in the trunk and the P content in the branch(P0.01/0.031,P=0.048).3)Forest age had a significant influence on the nutrient accumulation(P0.01);the nutrient accumulation amounts of the forests with different ages were in the order of mature forest(660.83 kg·hm~(-2)) near-mature forest(390.98 kg·hm~(-2)) overmature forest(312.08 kg·hm~(-2)) half-mature forest(208.57 kg·hm~(-2)) young growth(150.85 kg·hm~(-2));the nutrient accumulation rate was in the order of young growth(15.09 kg·hm~(-2)·a~(-1)) mature forest(13.22 kg·hm~(-2)·a~(-1)) near-mature forest(13.03 kg·hm~(-2)·a~(-1)) half-mature forest(10.43 kg·hm~(-2)·a~(-1)) overmature forest(3.90 kg·hm~(-2)·a~(-1)).The results indicated that in order to adapt to the dry and barren land,the survival strategies of P.euphratica were the fast growth of the underground part in the early growth stage,the high P content in the root and the increase of the nutrients of all organs.
【Fund】: 自治区科研机构创新发展专项(2016D04003);; 2016年度中央引导地方科技发展专项
【CateGory Index】: S792.119
Download(CAJ format) Download(PDF format)
CAJViewer7.0 supports all the CNKI file formats; AdobeReader only supports the PDF format.
©2006 Tsinghua Tongfang Knowledge Network Technology Co., Ltd.(Beijing)(TTKN) All rights reserved