Effect of different mixed proportion on soil quantity in mixed Robinia pseudoacacia and Pinus tabulaeformis plantations
XUE Lingyu, LI Qingdian, LI Jinhua, XIAO Mao, SHI Ge, WANG Yanping, LI Chuanrong, SHEN Weixing, GUO Huiling, ZHANG Yikun
1. Taishan Forest Ecosystem Research Station of State Forestry Administration/Key Laboratory of State Forestry Administration for Silviculture of the Lower Yellow River, 271018, Tai'an, Shandong, China;
2. Zoucheng Forestry Bureau, 273500, Jining, Shandong, China;
3. Taishan Scenery and Scenic Spot Area Management Committee, 271000, Tai'an, Shandong, China
Abstract：[Background]Robinia pseudoacacia is nitrogen-fixing pioneer tree, which has been extensively naturalized in the temperate regions of North America, Europe, and Asia and can improve soil quality and alter soil microbial community. Due to its root-sucker reproduction, R. pseudoacacia formed specific plant communities, whose herb layer is markedly different from that in forest dominated by native trees, resulting in the ecological risk. It causes both plant richness loss and shifts in species composition. In order to lift the reasonable utilization of R. pseudoacacia and let it play a greater role, the appropriate proportion of R. pseudoacacia was explored in Mount Tai.[Methods] The main soil types are crude brown soil and common brown soil. The elevation range of the sample in this study are 580-700 m and the slope are southeast. The sampling sites were determined based on the mixed proportion of R. pseudoacacia and Pinus tabulaeformis. Four types and three repeats for each type were set:type Ⅰ:pure R. pseudoacia (100%); type Ⅱ (70% R. pseudoacia+ 30% P. tabulaeformis); type Ⅲ (40% R. pseudoacia + 60% P. tabulaeformis); type Ⅳ:pure P. tabulaeformis(100%). The four types presented continuous patch distribution in this scenic spot, and the habitat characteristics were relatively consistent. Soil microorganisms, soil enzyme activities and soil nutrients for four types were analyzed. Soil quality of these forest stands was further assessed with principal component analysis (MDS-PCA).[Results] 1) Soil microorganisms, soil enzyme activities and soil nutrients increased with the increasing of proportion of R. pseudoacia. The soil microorganisms, NO3-N, available N, available P and catalase were significantly higher than type Ⅳ when the proportion of R. pseudoacia reached 40%. Acid phosphatase and urease were significantly higher than type Ⅳ when the proportion of R. pseudoacia reached 70%. 2) The pH, NO3-N, acid phosphatase and fungi were selected as the minimum data set (MDS). The soil quality index (SQI) of typeⅠ, type Ⅱ, type Ⅲ, type Ⅳ was 0.99, 0.78, 0.67 and 0.01, respectively. In general, all three types of plantations improved soil quality compared to type Ⅳ. With the increasing of the proportion of R. pseudoacacia, the soil quality was significantly better than that of pure P. tabulaeformis forest. When the proportion of R.pseudoacia reached 40%, the soil quality was improved significantly. But the soil quality was not improved significantly when the proportion of R. pseudoacacia continued to increase.[Conclusions] Comprehensive analysis shows that increasing the proportion of R. pseudoacacia can significantly improve the soil quality. Therefore, adjusting the proportion of R. pseudoacacia and maintaining the proportion at 40%-70% are suggested to improve the general fertility quality of forest stands.
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2019, Vol. 17 
