摘要
以砒砂岩区5种典型植被类型为研究对象,通过径流小区监测和室内试验相结合的方法对不同植被类型样地的降雨特征、土壤侵蚀特征、土壤基本物理性质以及土壤抗崩解能力进行了对比分析,从而研究土壤崩解特征的影响因素。结果表明:(1)沙棘—本氏针茅灌草地的土壤水分含量、土壤黏粒含量、土壤孔隙度均高于其他植被类型,裸地的砂粒含量和土壤容重均高于其他植被类型样地;(2)土壤崩解过程曲线呈现“L”型,整个过程为4个阶段:快速吸水阶段(0~5 s)、高速崩解阶段(5~30 s)、缓慢崩解阶段(30~180 s)、完成崩解阶段(180~720 s),乔灌混交林地的土壤抗崩解能力较强,而裸地土壤抗崩解能力最差;(3)通过Spearman秩相关系数分析发现,最大崩解指数与砂粒含量以及土壤总孔隙度呈极显著相关关系(R^(2)>0.673,P<0.01),与土壤含水率、土壤黏粒含量以及粉粒含量呈显著相关关系(R^(2)>0.651,P<0.05),平均崩解速率与土壤砂粒含量呈显著相关关系(R^(2)>0.680,P<0.05)。整体看来,土壤含水率、土壤黏粒以及土壤粉粒含量状况可以表征土壤最大崩解指数的多寡;平均崩解速率则可以土壤砂粒含量的多寡来表征。以上研究结果以期为砒砂岩区土壤微观机理及生态修复技术研究提供基础数据与理论支撑。
The rainfall characteristics,soil erosion characteristics,basic physical properties of soil,and soil disintegration resistance of the sample plots of different vegetation types were analyzed,by selecting five typical vegetation types in the Pisha sandstone area,and combining the runoff plot monitoring and laboratory tests.The results showed that,the soil moisture content,soil clay content,and soil porosity of the sea buckthorn-Stipa benthamiana shrub grassland were higher than those of the land with other vegetation types.The sand content and soil bulk density of the bare land were higher than those of the land with other vegetation types.The soil disintegration process curve was L-shaped,and the whole process was divided into four stages,i.e.,rapid water absorption stage(0-5 s),high-speed disintegration stage(5-30 s),slow disintegration stage(30-180s),and complete disintegration stage.Solution stage(180-720 s).The soil disintegration resistance of the mixed forest land with trees and shrubs was stronger,while the soil disintegration resistance of the bare land was the worst.Through the Spearman rank correlation coefficient analysis,it was found that the maximum disintegration index was significantly correlated with the sand content and the total soil porosity(R^(2)>0.673,P<0.01),and significantly correlated with the soil water content,soil clay content,and silt content(R^(2)>0.651,P<0.05).The average disintegration rate was significantly correlated with soil sand content(R^(2)>0.680,P<0.05).Overall,the soil moisture content,soil clay content,and soil silt content could characterize the maximum disintegration index of the soil,the average disintegration rate could be characterized by the soil sand content.The above research results were expected to provide basic data and theoretical supports for the study of soil micro-mechanism and ecological restoration technology in the Pisha sandstone area.
作者
秦富仓
董晓宇
郭月峰
李龙
李艳
QIN Fucang;DONG Xiaoyu;GUO Yuefeng;LI Long;LI Yan(College of Forestry,Inner Mongolia Agricultural University,Hohhot 010019,China;College of Desert Control Science and Engineering,Inner Mongolia Agricultural University,Key Laboratory of Desert Ecosystem Protection and Restoration,State Forestry and Grassland Administration,Hohhot 010011,China)
出处
《内蒙古农业大学学报（自然科学版）》
CAS
2022年第5期61-70,共10页
Journal of Inner Mongolia Agricultural University(Natural Science Edition)
基金
内蒙古自治区自然基金重大项目(2021ZD07)
内蒙古自治区科技计划项目(2020GG0075)
国家自然科学基金项目(41967008)
关键词
植被类型
降雨特征
土壤崩解
砒砂岩区
Vegetation allocation model
Rainfall characteristics
Characteristics of soil disintegration
Pisha sandstone area
