Soil macropore and its studying methodology.;

The soil macropore could contain some preferential flow, which would lead to groundwater pollution.

The results showed that:(1)The soil water infiltration rates in layer A were higher than those in layer B for all kinds of vegetation,which were remarkably related to soil porosity.

Several common indirect methods such as methods based on the soil pore size distribution models, the soil moisture redistribution process, and the pedotransfer functions, are introduced.

By analysis of sampled soil physical properties,compared that with bare area,the results show that: there is no certain change pattern between soil bulk density and soil porosity;the bulk of soil bulk density gets larger and the soil gets deeper,while the soil bulk density gets smaller at certain depth and the capability of sluice falls.

Plastic mulching or intercropping combined with pruning and fertilization not only increased the biomass yield of Japanese honesuckle ( Lonicera japonica Thumb) but also improved its water- and soil-conserving effect, for such management technologies decreased soil bulk density, increased soil porosity and enhanced the water-holding capacity of the soil.

The results showed the evident existences of the vertical spatial variability of porosity in soils on mm-scale; the variability of the cultivated soil originated from a prairie soil was higher than that originated from a forest soil, and the variability has a negative relation with the soil porosity but a positive relation with the soil depth with the tillage horizon; however, the variabi.