The Effect Of Different Operation Modes On Soil Physical And Chemical Properties Of Pecan Forest

In order to explore the different artificial recovered vegetation patterns on pecan’s forest soil nutrients and production, we established 4 modes that is P1 (planting amorpha under the pecan forest), P2 (planting bahia grass under the pecan forest), P3 (planting white clover under the pecan forest), P4 (planting herbicide under the pecan forest) in typical of Ningguo pecan forest ecosystem severely degraded forest land in Xianxia town, Ningguo. The results show that:1. It is effective to increase the product of pecan by planting amorpha, planting bahia grass pattern on the water to keep the best, the pH of soil is the best on the growth.The content of the whole pattern of calcium in Pecan forest planting white clover is 66.25 mg/kg, total nitrogen content up to 112.68 g/kg, ranking first in four of the model. Pecan bahia grass understory planting patterns contain the nitrogen content is follow by the first, whose highest moisture content is 17.68%, and pH 5.88 is pecan most suitable growth; Pecan forest planting amorpha mode plots highest yield 75kg, and lowest production is in pecan forest herbicide mode plots yield.2. Pecan leaf nutrient content showed different dynamic seasonal changes. Pecan forest planting amorpha mode, bahia grass planting patterns is more suitable for pecan woodland planting than pecan forest herbicide mode. Compared with different periods, the total phosphorus content of the difference is not significant, but total nitrogen, total potassium, total calcium, total magnesium are significantly in different operating modes. In April, the average total potassium content of pecan forest herbicide mode is 2.139g/kg at least, and average levels of total calcium, total magnesium are all the highest of pecan forest planting amorpha mode which are 8.903 mg/kg, 112.429mg/kg respectively, and the average total nitrogen content is up to 29.800 g/ kg under pecan bahia grass understory planting pattern. During September, under pecan forest herbicide modes, the average of the total magnesium and the total potassium content are at least 6.000 g/kg,1.157g/kg respectively, while the average calcium content of whole pecans understory planting amorpha mode is up to 86.815mg /kg, and the average total nitrogen content is up to 7.066 g/kg under pecan bahia grass understory planting pattern.3. Pecan forest planting fertilizer amorpha mode can play to their capabilities. It can be drawn by comparing with each other pecan leaves nutrients in four different operating modes that pecan bahia grass understory planting pattern has highest nitrogen content and lower levels of other elements; the total potassium content is higher under pecan forest planting white clover pattern, the other elements in general; The overall elements is higher in pecan forest planting amorpha mode, and what is lower in pecan forest herbicide mode.Understory planting amorpha mode effectively increase productions and conducive to play the fertilizer effects. Pecan bahia grass understory planting patterns is best conducive to play fertilizer, maintain soil quality.