林带对黑土坡耕地土壤团聚体组成及稳定性的影响  

Influence of Shelterbelt on Soil Aggregate Composition and Stability of Slope Farmland in Black Soil

作　　者：谭凯亮 苏远航 刘滨辉[1] Tan Kailiang;Su Yuanhang;Liu Binhui(Northeast Forestry University,Harbin 150040,P.R.China)

机构地区：[1]东北林业大学,哈尔滨150040

出　　处：《东北林业大学学报》2022年第3期93-98,108,共7页Journal of Northeast Forestry University

基　　金：“十四五”国家重点研发计划项目(2021YFD1500705);中央高校基本科研业务费专项资金项目(2572019CP09)。

摘　　要：为探明农田防护林带对黑土区坡耕地土壤团聚体组成及稳定性的影响,选取该区坡度、坡长和前茬作物基本一致的有农田防护林带和无林带的坡面(简称有林地、无林地)作为研究对象,采用萨维诺夫法测定有林地、无林地不同坡位(坡上、坡中上、坡中、坡中下、坡下)表层(0~20 cm)土壤团聚体组成及稳定性指标。结果表明:有林地与无林地中各粒级风干和水稳性团聚体比例、团聚体稳定性总体差异不显著。但林带影响了土壤水稳性团聚体组成和稳定性的坡面变化,表现在有林地与无林地相比,坡中上、坡中下的中粒级(粒径0.5 mm<d≤2.0 mm)水稳性团聚体比例显著增加(P<0.05),小粒级(粒径小于0.50 mm)水稳性团聚体比例显著减小(P<0.05),水稳性团聚体组成较好,而坡中的中粒级(粒径0.5 mm<d≤2.0 mm)水稳性团聚体比例显著减小(P<0.05),小粒级(粒径小于0.50 mm)水稳性团聚体比例显著增加(P<0.05),水稳性团聚体组成变差;有林地坡中上、坡中下的粒径大于0.25 mm水稳性团聚体比例、平均质量直径、几何平均直径显著增加(P<0.05),粒径大于0.25 mm团聚体破坏率显著减小(P<0.05),团聚体稳定性增强,坡中的粒径大于0.25 mm水稳性团聚体比例、平均质量直径、几何平均直径显著减小(P<0.05),粒径大于0.25 mm团聚体破坏率显著增加(P<0.05),团聚体稳定性减弱。In order to explore the influence of farmland shelterbelt on the composition and stability of soil aggregates for sloping farmland in black soil region,the slope with farmland shelterbelt and without shelterbelt were selected and the slope direction,slope length and previous crops were basically the same.The composition and stability of soil aggregates at the surface layer(0-20 cm)for different slope positions(upper slope position,upper to middle slope position,middle slope position,middle to lower slope position and lower slope position)were measured in each test site by Savinovs method.There was no significant difference(P>0.05)in air-dried and water-stable aggregate proportion and aggregate stability between the slope with farmland shelterbelt and without shelterbelt.However,the shelterbelt affected the slope change of soil water-stable aggregate composition and stability.Compared with the slope without shelterbelt,after the shelterbelt is arranged on the slope,the proportion of medium-sized(0.5 mm<d≤2.0 mm)water-stable aggregates in the upper to middle and middle to lower slope position increased significantly(P<0.05),and the proportion of small-sized(d<0.50 mm)water-stable aggregates decreased significantly(P<0.05),so the composition of water-stable aggregates became better,while the proportion of medium-sized(0.5 mm<d≤2.0 mmmm)water-stable aggregates in the middle slope position decreased significantly(P<0.05),and the proportion of small-sized(d<0.50 mm)water-stable aggregates increased significantly(P<0.05),so the composition of water-stable aggregates becames worse.After the shelterbelt was arranged on the slope,the proportion of greater than 0.25 mm water stable aggregates,mean weight diameter and geometric mean diameter in upper to middle and middle to lower slope position significantly increased(P<0.05),andpercentage of aggregate disruption of particle size greater than 0.25 mm significantly decreased(P<0.05),so the aggregate stability was enhanced,while the proportion of particle size greater than

关 键 词：黑土 坡耕地 农田防护林带 土壤侵蚀 土壤团聚体 

分 类 号：S152.4[农业科学—土壤学]