文献类型：期刊文献

中文题名：绿洲农田防护林单株新疆杨生物量及其根冠比变化

英文题名：Changes in biomass and root-shoot ratio of individual Populus alba var.pyramidalis Bge.in oasis farmland shelterbelt

作者：赵英铭[1,2] 刘明虎[1] 周全来[3] 包岩峰[2] 程一本[4] 李艳丽[5] 杨文斌[2]

第一作者：赵英铭

机构：[1]中国林业科学研究院沙漠林业实验中心,国家林业和草原局内蒙古磴口荒漠生态系统定位观测研究站,内蒙古磴口015200;[2]中国林业科学研究院荒漠化研究所,北京100091;[3]中国科学院沈阳应用生态研究所,沈阳110000;[4]北京林业大学,北京100083;[5]中国农业科学院农业资源与农业区划研究所,北京100081

年份：2020

卷号：18

期号：1

起止页码：35-41

中文期刊名：中国水土保持科学

外文期刊名：Science of Soil and Water Conservation

收录：CSTPCD;;北大核心:【北大核心2017】；CSCD:【CSCD2019_2020】；

基金：中国林科院中央级公益性科研院所基本科研业务费专项资金项目“绿洲农田防护林碳储量与服务价值的研究”(CAFYBB2017MB002)。

语种：中文

中文关键词：根冠比;生物量;新疆杨;防护林;绿洲

外文关键词：root-shoot ratio;biomass;Populus alba var.pyramidalis Bge.;shelterbelt;oasis

分类号：S727.24

摘要：为探明绿洲农田防护林生物量累积过程及其根冠比变化趋势。作者以乌兰布和沙漠磴口黄灌绿洲内部农田防护林为研究对象,用空间代时间的方法,在2行林带结构中调查各径级单株新疆杨生物量代替不同年龄相应径级生物量,用固定样方法调查侧根生物量,得出地上、地下生物量及根冠比变化过程并建模,分析变化过程所可能隐藏的力学和生物学机制。结果显示:1)2行结构渠道防护林新疆杨单株幼龄林地上、地下生物量分别为15.212 kg、6.539 kg;中龄林、近熟林、成熟林阶段地上和地下生物量分别增长8.77倍和4.89倍、2.82倍和2.59倍、1.65倍和1.53倍,得出生物量模型7个。2)生物量根冠比排序幼龄林>中龄林>近熟林>成熟林,平均值为24.35%;幼龄林为43.67%;中龄林、近熟林、成熟林生物量根冠比分别减小1.79倍、1.10倍、1.08倍,得出生物量根冠比模型1个。3)主干生物量密度密度平均值为393.81 kg/m^3,幼龄林为375.02 kg/m^3;中龄林减小3.09%;近熟林增加3.37%;成熟林增加22.38%。4)幼龄林主根生物量密度为404.20 kg/m^3,中龄林、近熟林分别减小4.14%、0.48%,成熟林增加22.38%。幼龄林、中龄林、近熟林、成熟林根干密度比分别为1.08、1.07、1.03、0.79。由上述结果分析得出:正常情况下,随胸径增长地上和地下生物量均呈增长趋势,地上生物量和增速远大于地下,生物量差距增大,增速差距减小;随着胸径增大生物量根冠比呈减小趋势,减幅缩小,平均22.34%;主干生物量密度随胸径增加呈先减后增趋势,与胸径正相关,主根生物量密度随着胸径增加呈减小趋势,与胸径负相关。
[Background]Research on the biomass root-shoot ratio of shelterbelts is conducive to understand the gravity pressure of underground root biomass and the spatial distribution of aboveground and underground biomass at different ages,so as to improve the structural stability of trees and ensure the sustainable development of ecological service function of shelterbelts.In order to explore the biomass accumulation process and the change trend of root-shoot ratio of farmland shelterbelts in oasis,this study was carried out.[Methods]This study took the 2 rows farm-canal-forest-road type farmland shelterbelt in the Yellow River irrigation oasis of Dengkou in Ulanbuh desert as the research object.Space was used to replace time,and biomass of different diameter classes in the same space was used to replace biomass of different age diameter classes.Because the forest belt was closely connected with the canal,road farmland,and the investigation could not destroy the infrastructure,the fixed quadrat investigation method was adopted for the biomass of lateral roots.[Results]1)The aboveground and underground biomass of young forest in two-row canal shelterbelts were 15.212 kg and 6.539 kg,respectively,and the aboveground and underground biomass of half-mature,near-mature and mature forests increased by 8.77 times and 4.89 times,2.82 times and 2.59 times,1.65 times and 1.53 times,respectively.Seven biomass models were obtained.2)The root-shoot ratio of biomass was in the order of young forest>half-mature forest>near-mature forest>mature forest,the average value was 24.35%and that for young forest was 43.67%.The root-shoot ratio of biomass of half-mature forest,near-mature forest and mature forest decreased by 1.79 times,1.10 times and 1.08 times,respectively,and one biomass root-shoot ratio model was acquired.3)The average density of biomass of trunk was 393.81 kg/m^3,and that of young forest was 375.02 kg/m^3;half-mature forest decreased by 3.09%,and near-mature and mature forest increased by 3.37%and 22.38%,respectively.4)The biomass density of main roots of young forest was 404.20 kg/m^3.The biomass density of half-mature forest and near-mature forests decreased by 4.14%and 0.48%respectively,while that of mature forest increased by 22.38%.The root dry density ratios of young,half-mature,near-mature and mature forest were 1.08,1.07,1.03 and 0.79,respectively.[Conclusions]Under normal circumstances,both aboveground and underground biomass show an increasing trend with the increase of diameter at breast height(DBH),and the growth rate of aboveground biomass is much larger than that of underground biomass,the difference of biomass increases and the gap of growth rate decreases.With the increase of DBH,the root-shoot ratio of biomass tends a decreasing,and the decrease range is reduced.The biomass density of trunk firstly increases and later decreases with the increase of DBH,which is positively correlated with DBH.The biomass density of main roots decreases with DBH,which is negatively correlated with DBH.