The soil maximal water storage capacity ([W.sub.t], t [hm.sup.-2]) and noncapillary water storage capacity ([W.sub.a], t [hm.sup.-2]) were derived from the following equations [23]: (1) [W.sub.t] = 10000Pth; (2) [W.sub.a] = 10 000[P.sub.a]h, where [P.sub.t] (%) indicates the total porosity of soil, [P.sub.a] (%) indicates the noncapillary porosity of soil, and h (m) indicates the depth of soil layer.
In addition, the highest soil total porosity, noncapillary porosity, organic matter content, microbial quantities (bacteria, actinomyces, and fungus), and enzyme activities (catalase, dehydrogenase, urease, and invertase) were also found in thinning intensity of 30%, while the soil pH had no obvious change under different thinning intensities.
The indexes of soil infiltration rate and water storage capacity were significantly negatively correlated with soil bulk density and significantly positively correlated with soil total porosity, noncapillary porosity, organic matter content, bacteria, actinomyces, fungus, catalase, dehydrogenase, and urease, while the correlation with natural soil water content and soil pH was not significant.