| Non-textile is one kind of composition material. It is made from polypropylene, polyester, viscose rayon raw material and so on. It is ventilatal, durable and can preserve heat and moisture etc. This paper studied some indexs on forest land soil and tree growth after mulched non-textile in the level trench in the Southern Mountain in Lanzhou City. The paper contrasted analyzed the difference between mulch treatments and CK mainly from soil temperature, soil water content, Robinia pseudoacacia growth, photosynthesis physiology ecology and so on.The results showed that mulch treatments influenced soil temperature remarkly comparing wite CK. Non-textile displayed the strong heat preservation function, reduced the soil temperature daily change in shallow layer, and the heat preservation function is stronger in thicker mulch treatment. Simultaneously, the mulch treatments delayed the time appearance of peak soil temperature in deep layer and alleviated the soil temperature change scope. Regardless of the mulch treatment or the bare land comparison, the soil temperature daily change scope reduced gradually along the soil layer depth deepening. In the shallow layer soil temperature daily variation maximum value is 15.5℃, and in deep soil layer the minimum value is 1.2℃. The soil temperature conducted continuously to 25cm, and the influence on soil depth in mulch treantment is bigger than comparison on soil temperature, and the much thicker covers the much remarkable influence on soil depth transmission, especially T3 treatment temperature influence on soil conduction depth is the biggest of all treatments.The seasonal change on soil water content is the result of the precipitation and the plant growth combined action. The precipitation and the plant growth influenced the soil water content obviously to the soil shallow layer, but it is not obvious to deeper soil moisture In the growth initial period, the mulch treatment soil water content is higher than the CK obviously. In the growth prosperous period, all treatments soil water content size is T3>T1>CK>T2. The Non-textile treatment displayed the function of preserving moisture obviously, but during this period the soil water content is mainly due to plant growth absorbing. In the growth last stage, the soil water content size is T3>T2>T1>CK, and it is mainly due to the ground evaporation In the tree growth period, the mulch treatment displayed strong moisture preservation function, and the thicker the stronger. After the tree stopped grow, in the entire soil layer, the storage soil water is T3>T2>T1>CK, and mulch treatments are higher than CK, the thicker the higher. The non-textile mulch treatment played an importane influence to the year's end storage soil water.After the non-textile covers, there is a statistics difference on leaf area and growth rate of Robinia pseudoacacia between T2,T3 treatments and CK. The leaf water content in mulch treatments is obvious higher than CK. The average leaf moisture content in T3 treatment outdoes 6.62 percentage points most greatly to the CK. After the non-textile covers, in the mid and late growth periods, the photosynthesis speed and the transpiration speed daily change are consistent with the soil water content change. The photosynthesis and the transpiration all reduced along with the soil moisture content reducing. 450g/m~2 and the 500g/m~2 mulch treatments are able to enhance the soil water use efficiency1 and can save water.On the one hand, the level trench with non-textile mulch combile use can collect the rainfall fully. The rainfall resource is centralized, which reduced the outflow and the evaporation moisture content. On the other hand, it alleviated the soil temperature change, enhanced the soil moisture, promoted the plant growth indirectly, and it can preserve moisture and achieve the goal to save water efficiently. |
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