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| Influence of different site preparation modes on the function of soil and water conservation of Platycladus orientalis forest in Limestone Mountainous region |
| 1.Shandong Province Key Laboratory of Soil Erosion and Ecological Restroration, College of Forestry,Shandong Agricultural University, 271018, Tai’an, Shangdong;2.The Shandong Forestry Reference Foreign Project Office,250014,Jinan:China |
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Abstract Six-year-old Platycladus orientalis forest, built in three different site preparations, i. e. level-terrace, scale ripple and foveolate site preparation on the upper part of Dongshan small watershed, the limestone area in Wennan Tower, Xintai City, was chosen to be the research object. In October 2012,sample harvest method was used to measure the stand volume of litter and biomass of shrub and grass,cutting ring water immersion method was used to measure soil physical properties and water storage performance, monocyclic ring quantitative water was used to measure soil infiltration rate and scaleplate was used to measure soil erosion amount. The results in the research of influence on Platycladus orientalisfrom different site preparation modes showed that: 1) In level-terrace site preparation, the soil physical properties were best and the soil nutrients quality was highest, while those in scale ripple site preparation took second place and in foveolate site preparation were worst. The soil infiltration rate of Platycladus orientalis in level-terrace site preparation was highest while that in foveolate site preparation was lowest.2) The tree growth and litter layer volume of level-terrace site preparation was biggest while that of foveolate site preparation was smallest. 3) The understory shrub and grass biomass of three site preparations was all less than the control; the biomass of foveolate site preparation was largest, that of level-terrace site preparation was smallest and that of scale ripple site preparation was between the two.4) Compared with the control, the soil saturation water storage in level-terrace site preparation was the largest with 117.69 m3 / hm2, followed by 97.04 m3 / hm2 of scale ripple site preparation and the smallest was 78.90 m3 / hm2 of foveolate site preparation. 5) Compared with the control, the soil erosion amount reduced the most with 39.161 t/ hm2·a in level-terrace site preparation, while that of foveolate site preparation reduced the least, to be 34.569 t/ hm2·a. The research provided scientific basis for choosing site preparations to build soil and water conservation forest on the upper part of limestone degradation mountain.
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Received: 23 October 2012
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