Selecting canopy interception rate,capillary porosity,non-capillary porosity and soil anti-erosion coefficient as analysis indices,the function of non-point source pollution control of four forest communities in Simian Mountains of Chongqing were analyzed by Grey Relational Grade Analiysis.

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.

To study the main microbial processes contributed to N2O emission,enrichment technique was used to isolate autotrophic nitrifiers,heterotrophic nitrifiers/aerobic denitrifiers and anaerobic denitrifiers from vegetable soil,and two re-inoculating soils autoclaved were incubated at 30 ℃ under 30%,50%,100% WFPS(Water-f.

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.