水保所知识产出(1956---)知识库

Large-scale afforestation has seriously aggravated the consumption of soil water and caused soil desiccation and
even the dry soil layers, which has been restricting the survival and sustainability of vegetation in semi-arid
areas. How to solve soil water deficit reasonably is an important practical problem we are facing. Here, a
field experiment of the decayed roots with different times on soil water infiltration processed was conducted in
planted forestland by a double-ring infiltration instrument, to determine the contribution of decayed tree roots
on soil water infiltration process and replenishment. Results showed that the decayed process of tree roots in
forestland could significantly reduce root density (RD) and increase the relative porosity improved by the roots
(RPIR) (P < 0.05). The macropore formed by root decay could not only significantly increase the infiltration rate
at each stage (P < 0.05), but also reduce the decrease rate of infiltration rate. Compared with bare land, the
decayed roots of the 1–4 yr, the 5–8 yr, and the 9–12 yr increased the amount of soil water replenishment by
37.12%, 217.52%, and 259.85%, respectively. Overall, the decayed tree roots could maintain a relatively high
and stable infiltration rate by reduced root density, which increased the effective replenishment of soil water of
dry soil layers in forestland. These findings have potential implications for understanding the effect of decay
process of tree roots on soil water replenishment, and provide a theoretical basis for the solution to dry soil layers
and sustainable management of forestland in semi-arid areas.