塔里木河中游不同生境胡杨林土壤有机碳及活性组分特征  

Characteristics of Soil Organic Carbon and Active Fractions in Populus euphratica of Different Habitats in the Middle Reaches of the Tarim River

作　　者：马继龙 王新英 刘茂秀 史军辉 艾吉尔·阿不拉 MA Ji-long;WANG Xin-ying;LIU Mao-xiu;SHI Jun-hui;Aijier Abula(College of Forestry and Landscape Architecture,Xinjiang Agricultural University,Urumqi 830052,Xinjiang,China;Research Institute of Afforestation and Desertification Prevention and Control,Xinjiang Academy of Forestry Sciences,Urumqi 830063,Xinjiang,China;Xinjiang Poplar Riparian Forest Ecosystem National Positioning Observation and Research Station in Tarim River,Urumqi 830046,Xinjiang,China)

机构地区：[1]新疆农业大学林学与风景园林学院,新疆乌鲁木齐830052 [2]新疆林科院造林治沙研究所,新疆乌鲁木齐830063 [3]新疆塔里木河胡杨林生态系统国家定位观测研究站,新疆乌鲁木齐830046

出　　处：《西北林学院学报》2024年第2期182-188,共7页Journal of Northwest Forestry University

基　　金：自治区林草科技专项(XJLYKY-2022-01);自治区公益性科研院所基本科研业务费专项(KY2019047)。

摘　　要：以塔里木河中游不同生境典型胡杨河岸林为研究对象,分析旱生、中生和周期性水淹3种不同生境下0~100 cm土体中土壤有机碳及活性组分含量变化特征。结果表明,1)3种生境胡杨林SOC含量均值依次为中生(3.65 g/kg)>旱生(3.56 g/kg)>周期性水淹(3.35 g/kg);随土壤深度的增加,SOC含量均呈波动性下降趋势。2)3种生境土壤MBC含量均值依次为中生(408.93 mg/kg)>周期性水淹(289.80 mg/kg)>旱生(182.75 mg/kg),而EOC和DOC含量为周期性水淹(2.28 g/kg、104.39 mg/kg)>中生(1.92 g/kg、67.40 mg/kg)>旱生(1.89 g/kg、57.79 mg/kg);随土壤深度的增加,EOC含量总体增加后降低,DOC含量呈降低趋势;MBC在不同生境和土层间均差异显著(P<0.05);EOC仅表层(0~10 cm)与下层(60~100 cm)差异显著(P<0.05);中生生境DOC土层间差异显著(P<0.05)。3)40~100 cm土层MBC/SOC、20~60 cm土层EOC/SOC、10~100 cm土层DOC/SOC在3种生境间差异显著(P<0.05)。4)3种生境SOC与DOC均呈显著正相关(r>0.58,n=15),活性组分之间相关性在中生生境下最显著。综合以上分析,不同生境和土层对SOC及活性组分含量产生显著影响,旱生和周期性水淹生境SOC及活性组分含量在0~20 cm土层维持着较高水平,中生生境则在20~40 cm土层保持着较高的SOC活性组分分配比例,其土壤微生物活性最高,SOC转化速率较高。Taken the typical Populus euphratica riparian forests in different habitats in the middle reaches of the Tarim River as the research objects,the variation characteristics of soil organic carbon(SOC)and active components in 0-100 cm soil layer in xerophytic,mesophytic and periodically flooded habitats were analyzed.The results showed that 1)The average SOC content of P.euphratica forests in the three habitats was mesophytic(3.65 g/kg)>xerophytic(3.56 g/kg)>periodic flooding(3.35 g/kg).The SOC content decreased with the increase of soil depth.2)The average soil microbial biomass carbon(MBC)content in the three habitats was mesophytic(408.93 mg/kg)>periodically flooded(289.80 mg/kg)>xerophytic(182.75 mg/kg).The readily oxidizable carbon(EOC)and dissolved organic carbon(DOC)contents were periodically flooded(2.28 g/kg,104.39 mg/kg)>mesophytic(1.92 g/kg,67.40 mg/kg)>xerophytic(1.89 g/kg,57.79 mg/kg).With the increase of soil depth,EOC content increased and then decreased,while DOC content showed a decreasing trend.There were significant differences in MBC among different habitats and soil layers(P<0.05).Significant differences in EOC were found only between surface layer(0-10 cm)and the bottom layer(60-100 cm)soil(P<0.05).There were significant differences in DOC between soil layers in Mesozoic habitats(P<0.05).3)MBC/SOC in 40-100 cm soil layer,EOC/SOC in 20-60 cm soil layer and DOC/SOC in 10-100 cm soil layer were significantly different among the three habitats(P<0.05).4)There was a significantly positive correlation between SOC and DOC in the three habitats(r>0.58,n=15),and the correlation between active components was the most significant in the Mesozoic habitats.Based on the above analysis,different habitats and soil layers have significant effects on SOC and active component contents.The xerophytic and periodically flooded habitats maintained a higher SOC and active component content in 0-20 cm soil layer,while the mesophytic habitats maintained a higher SOC allocation ratio in 20-40 cm soil layer,and the soil m

关 键 词：胡杨河岸林 生境 土壤有机碳 活性组分 

分 类 号：S792.11[农业科学—林木遗传育种]