Effects Of Management On Phyllostachys Heterocycla Cv. Pubescens In Soil Water Retention Characteristics

Moso bamboo (Phyllostachys heterocycla cv. Pubescens) is the most widespread and valuable inthe bamboo resources, which has an important position in the forestry industry in China. As thepromotion of moso bamboo forestry intensive management, bamboo wood output and economicbenefits have been greatly promoted, however there is a sharp drop in site recession, soil erosion, waterand soil conservation and protective effect of moso bamboo forest. Therefore, how to take an effectivemeasures for moso bamboo correctly, make moso bamboo satisfy the needs of social economicdevelopment and meet the ecological function is the problem needing to be solved.Through the compare with the soil water physical property of moso bamboo with the differentvertical bamboo density, different management years and application of absorbent polymer, and soilmoisture monitoring of woodland. Then we research the distribution of precipitation of different verticalbamboo density and the monitoring of the variation of soil water content after the application ofabsorbent polymer used in moso bamboo forest, discuss the effects of management on the soil waterphysical property and water and soil conservation, this paper draws conclusions as follows:1The soil physical properties of moso bamboo forest have been better water-retaining property andair permeability under2451plants/hm2vertical bamboo density; soil bulk density, the capillary water,saturation moisture capacity, total porosity and soil moisture are higher than the others. the structure ofsoil aggregate is more stable under2995plants/hm2vertical bamboo density, canopy interception andstem flow are positive correlation with vertical bamboo density, total precipitation reached forestsurface is negative correlation with vertical bamboo density. The soil water retention is better than theothers under2746plants/hm2vertical bamboo density, by the PCA analysis method.2The effects of management years on the soil water retention of moso bamboo are complicated.The capillary water, saturation moisture capacity, capillary porosity, total porosity and soil moistureexhibit the tendency of rise at first and then drop by increasing the management years. The effects onthe structure of soil aggregates have different trend:15-years-old moso bamboo is better than5-years-old and10-years-old,5-years-old is better than10-years-old. Comprehensive analysis showsthat the F of10-years-old moso bamboo is the highest, as0.5159;5-yesrs-old is the second, as0.2847;15-years-old is the last one, as0.2312, the soil water physical property of10-years-old moso bamboo isbetter than the others.3Application of absorbent polymer has obvious effects on moso bamboo which can improve soilphysical properties, improve the stability of soil aggregate structure of0–10cm depth, maintain soilmoisture at the higher level, especially under the less precipitation (in September and October), themean value of soil moisture with absorbent polymer is higher10.20%than that without absorbentpolymer, during the period.4Soil bulk density is significantly related with most soil physical properties. After soil waterretention analysises, soil bulk density is always accounted for a large proportion. Therefore, soil bulkdensity is an important index to judge soil quality and the soil water physical property of moso bamboo, in all the index of soil physical properties.