作 者：
赵英铭;杨文斌;雷渊才;李炜;孙非;张格;郝玉光;刘芳
单 位：
中国林业科学研究院荒漠化研究所;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;中国林业科学研究院资源信息研究所
关键词：
根;生物量;窄林带;农田防护林;绿洲;干旱区
摘 要：
为探究干旱区黄灌绿洲节水型窄林带结构农田防护林带不同土层深度根生物量及变化规律,以计算不同土层根碳储量,特开展本研究。试区在乌兰布和沙漠磴口绿洲,选择2行节水型窄林带结构田渠林路式农田防护林为研究对象,采用空间代替时间法和固定样方法,林带同一空间内各径级根生物量代替各时段径级根生物量,实地调查20棵目标树单株各土层空间根生物量并建立模型,分析模拟林带根生物量的增长过程。研究得出:窄林带不同土层根、主根、侧根生物量与胸径和树高的增长模型20个; 0～50、50～100、100～150、150～200 cm层根生物量平均比例分别为59. 32%、38. 68%、1. 82%、0. 18%; 0～100 cm土层包含98%的根生物量;主根占2/3,每层占比除0～50 cm土层均递增;侧根为双层结构占1/3,分别在0～50、50～100 cm土层,占比例分别为递增、递减。各土层根、主根、侧根生物量呈垂直空间呈倒金字塔逐层递减浅土层集中分布,与胸径、树高正相关,各层分配比例相对恒定的。这一研究结果对于干旱区绿洲防护林乃至三北地区节水型窄林带结构农田防护林根碳储量研究有着重要参考意义。
译 名：
Root biomass per plant at different soil depths in oasis water-saving forest belt
作 者：
ZHAO Yingming;YANG Wenbin;LEI Yuancai;LI Wei;SUN Fei;ZHANG Ge;HAO Yuguang;LIU Fang;Institute of Desertification Studies,Chinese Academy of Forestry;Experimental Center of Desert Forestry,Chinese Academy of Forestry;Inner Mongolia Dengkou Desert Ecosystem Research Station,State Forestry and grassland Administration;Research Institute of Forest Resource Information Techniques;
关键词：
root;;biomass;;narrow forest belt;;farmland shelterbelt;;irrigated oasis in the Yellow River;;arid area
摘 要：
[Background]The oasis farmland shelterbelt plays an important role in carbon sequestration.The existing biomass models are mostly flaky forest structures,with large differences between species,small DBH,lack of representativeness,and flaky forest easy degradation forming a little old tree.Uprooting to be difficult and complex,the study on the root biomass of narrow forest belt is not deep enough. Long-term observation is difficult,and the annual biomass survey reduces the benefits of forest belt conservation,wind protection,carbon sequestration,and age modeling and actual discrepancies,uprooting damage infrastructure,etc. In order to solve these problems,a model of root biomass is used to study the distribution of root biomass and its variation in different soil layers of forest belts,which provided a reference for the study of carbon storage of shelterbelt roots in narrow forest belts. [Methods]The experimental area was based on the Dengkou oasis of the Ulan Buh Desert in China,and two rows of narrow shelterbelt were selected as the water-saving structure. The space was used instead of the time to carry out the root biomass survey of the 20 target trees according to DBH. Used the fixed sample method,width,length,depth of the sample were respectively 2. 3 m,2. 5 m,2 m,and were divided into four layers each layer of 50 cm. The fresh weight of root was weighed,and the sampling was calculated according to the dry-to-sale ratio and biomass in the sample. Based on lateral root biomass inside the sample to calculate outside,the total biomass was the sum of the biomass inside and outside the sample plot. The model was established and analyzed by SPSS from the root biomass of each diameter to analyze the simulated biomass growth process. [Results] The study found that there were 20 growth models of root biomass and distribution of DBH and tree height in narrow forest belts,and the proportions of 0-50 cm,50-100 cm,100-150 cm and 150-200 cm eaverage root biomass were 59. 32%,38. 68%,1. 82%,and 0. 18% respectively,and the 0-100 cm soil layer contained 98% of the root biomass. The Main root was 2/3 root biomass,which increases with DBH,and the proportion of each layer increased with the exception of 0-50 cm soil layer. The lateral root was a 2-layer structure,distributed in 0-50 cm and 50-100 cm soil layer,and also increaseed with DBH,the proportion of 0-50 cm soil layer increased,and the proportion of others decreases. [Conclusions] The experiment achieved the expected results. Root biomass of oasis shelterbelt is inverted pyramid shape and distributed in shallow soil layer with Main space decreasing layer by layer and increases with increasing DBH,and distribution proportion being relatively constant. The results of this study have important reference significance for the calculation of root biomass and carbon storage in the oasis farmland shelterbelt in the arid zone and even the Three North Region.
