Effect of Freezing and Thawing on Soil Anti-scourability Under Different Land Use Types in the Black Soil Region of Northeast China
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.
freezing and thawingland use typessoil anti-scourabilityrootsthe black soil region of northeast china
国家科技期刊平台
NSTL
万方数据
维普
