摘要
为研究东北黑土区冻融作用对不同土地利用土壤抗冲性的影响,在泉河小流域于冬季土壤冻结前和春季土壤解冻后期采集松树林地、柞树林地、草地和农田土样,采用原状土抗冲槽冲刷法进行抗冲试验。结果表明：（1）经过冻融作用,土壤抗冲性下降。（2）春季解冻期4种土地利用类型土壤抗冲性表现为柞树林地〉农田〉草地〉松树林地;春季解冻期土壤抗冲性与土壤含水率总体呈负相关。（3）随流量增大,土壤抗冲性相对减弱;冻融作用后0～8min仍为产沙的主要阶段（产沙量占总产沙量的72%～76%）。（4）春季解冻期受根系影响,0—10cm土层土壤抗冲性大于10—20cm土层。主成分分析表明,〈3mm细根量和总根量是影响春季解冻期土壤抗冲性的首要因素。
In order to study the effect of freezing and thawing on soil anti-scouribility in the black soil region of northeast China, soil samples were selected from 4 land use types （pine forest, oak forest, grassland and farmland） in Quanhe watershed before soil freezing in winter and after soil thawing in spring, and then soil anti-scouribility was tested by the undisturbed soil sample washing method. The results showed that： （1） Soil anti-scourability decreased after freezing and thawing. （2） In the spring soil thawing period, soil anti-scourability under the 4 land use types followed the order of oak forest〉farmland〉grassland〉pine forest. Soil moisture showed negative correlation with soil anti-scourability in the spring soil thawing period. （3） Soil anti scourability reduced with the increase of the washing flow. 72%-76% of sediment were produced in the first 8 min after soil freezing and thawing. （4） With the help of roots, the soil anti-scourability of 0-10 cm soil layer was greater than that in 10 20 cm soil layer in the spring soil thawing period. The principal component analysis suggested that 〈3 mm fine root biomass and the total root biomass were the main factors affecting the soil anti-scourability in the spring soil thawing period.
出处
《水土保持学报》
CSCD
北大核心
2015年第6期69-73,共5页
Journal of Soil and Water Conservation
基金
国家自然科学基金项目(41201263
41371272)
辽宁省教育厅科学研究项目(L2012237)
辽宁省农业领域青年科技创新人才项目(2015052)
关键词
冻融作用
土地利用
土壤抗冲性
根系
东北黑土区
freezing and thawing
land use types
soil anti-scourability
roots
the black soil region of northeast china
