摘要
【目的】探明滨海新围垦盐土地不同植物配置模式细根的空间分布特征及其对根域表层土壤(0~10 cm)电导率(EC)、pH和水分(SM)的影响。【方法】运用根钻连续取样法和地统计学相结合的方法,研究上海滨海新围垦盐土地3种植物配置模式:乔木(TSM)、灌丛(SSM)和乔灌模式(TSSM)的细根分布特征及裸地(CK)4种类型下的土壤电导率(EC)、pH和水分(SM)的水平分布格局。【结果】TSM、SSM、TSSM 3种植物配置模式下的细根生物量(FRD)和根长密度(FRLD)的水平分布格局具有明显的差异性和高变异系数,且在总量上差异显著(P<0.05),其中TSSM模式的FRD和FRLD值最大(54.71 g/m^(2)和5451.66 m/m^(3)),TSM模式次之(20.62 g/m^(2)和2204.06 m/m^(3)),SSM模式最小(14.29 g/m^(2)和1717.83 m/m^(3))。3种配置模式下的土壤EC、pH和水分的水平分布具有明显的空间异质性,其中CK的空间异质性最高。种植植物后,由于植物地上冠幅荫蔽作用导致的土壤表层水分蒸发减少、植物地下根系间的竞争机制以及降雨的淋溶作用,促使根系改变TSM、SSM和TSSM群落内土壤EC、pH和SM的分布格局,并使其分布更具均质性;在总量上,与CK相比,TSSM、TSM和SSM 3种模式的土壤盐度(EC)显著降低(降幅90.48%、90.32%和91.12%),pH明显下将(降幅1.03%、0.69%和1.72%),土壤水分(SM)显著增加(增幅41.52%、45.16%和46.44%)。【结论】3种植物配置模式中的FRB和FRLD与土壤EC和SM呈显著正相关。种植植物后显著降低土壤EC、pH,增加土壤SM含量,并改变其空间分布格局。其中TSSM模式具有最大的FRB和FRLD,降低土壤EC和pH、增加土壤SM的能力最强,在选用植物配置模式时,宜优先考虑TSSM模式。
【Objective】The study aimed to investigate the spatial distribution characteristics of fine roots and their effects on the electrical conductivity(EC),pH and water content(SM)of surface soil(0-10 cm)in coastal salt land under different plant configuration patterns.【Method】The distribution characteristics of fine roots and the horizontal distribution patterns of soil conductivity(EC),pH and water(SM)of three plant configuration modes tree stand model(TSM),shrub stand model(SSM),tree-shrub stand model(TSSM)and bare soil(CK)in new reclamation salt land were studied by combining root drilling method and geostatistics.【Result】The horizontal distribution patterns of fine root biomass(FRD)and root length density(FRLD)under the three configuration modes had obvious differences and high coefficient of variation,and the differences in total amount were significant(P<0.05).The TSSM model had the highest FRD and FRLD values(54.71 g/m^(2)and 5451.66 m/m^(3)),followed by TSM mode(20.62 g/m^(2)and 2204.06 m/m^(3))and SSM mode(14.29 g/m^(2)and 1717.83 m/m^(3)).The horizontal distribution of soil EC,pH and water under the three configuration modes had obvious spatial heterogeneity,and CK had the highest spatial heterogeneity.After planting,roots changed the distribution patterns of soil EC,pH and SM in TSM,SSM and TSSM communities and made their distribution more homogeneous due to the shading effect of plant canopy to reduce soil surface water evaporation,the competition mechanism between plant underground roots,and the leaching effect of rainfall.Compared with CK,the soil salinity(EC)of TSSM,TSM and SSM decreased significantly(90.48%,90.32%and 91.12%),and the soil pH reduced obviously(1.03%,0.69%and 1.72%),while soil moisture(SM)showed significant increasing trend(41.52%,45.16%and 46.44%).【Conclusion】FRB and FRLD were positively correlated with soil EC and SM under the three configuration modes.After planting,EC and pH of soil were decreased,SM content of soil was increased,and its spatial distribution pattern was changed.Among them,TSSM model had the largest FRB and FRLD owing the best ability to reduce soil salinity and pH and increase soil moisture,so TSSM model should be given priority when choosing plant configuration model.
作者
王志保
王辉
梁晶
于守超
江洪
仲启铖
WANG Zhi-bao;WANG Hui;LIANG Jing;YU Shou-chao;JIANG Hong;ZHONG Qi-cheng(College of Agriculture,Liaocheng University,Liaocheng,Shandong 252000,China;Shanghai Key Laboratory for Urban Ecological Processes and Eco-Restoration,Shanghai 200241,China;School of Ecological and Environmental Sciences,East China Normal University,Shanghai 200241,China;Insitute of Green Manure,Yan'an Academy of Agricultural Sciences,Yair an,Shaanxi 716000,China;Shanghai Academy of Landscape Architecture Science and Planning,Shanghai 200231,China;College of Pharmacy,Guizhou Universiy of Traditional Chinese Medicine,Guiyang 550025,China)
出处
《西南农业学报》
CSCD
北大核心
2022年第11期2579-2586,共8页
Southwest China Journal of Agricultural Sciences
基金
国家自然科学基金项目(31901210)
聊城大学创新创业训练计划项目(CXCY2022016,CXCY2022092,CXCY2022372)
聊城大学博士科研启动项目(318052123)。
关键词
细根分布
土壤特性
植物配置模式
新围垦盐土地
上海
Fine root distribution
Soil characteristics
Plant configuration model
New reclamation of salt land
Shanghai
