Effect of litter decomposition on soil properties polarization of three typical artificial pure broadleaved forests in the Loess Hilly Area
【Objective】 The study was about the effect of litter decomposition on soil properties polarization of three typical artificial pure broadleaved forests in the Loess Hilly Area,which can provide scientific basis for the prevention of soil degradation and continuous plantation obstacle.【Method】 In Shaanxi Huangling county which is located in semi-humid loess hilly area,the middle of Loess Plateau,humus soil and litter（leaf litter and fine roots） were sampled in three typical artificial pure broadleaved forests including Robinia pseudoacacia,Quercus liaotungensis and Populus simonii,and set 4 treatments including ＂soil＋leaf litter＂,＂soil＋roots＂,＂soil＋leaf litter＋roots＂,and control ＂soil＂ for laboratory incubation experiments.All treatments were incubated for 120 days,then the effect of litter decomposition on soil biological and chemical properties polarization was analyzed.【Result】 1）In the R.pseudoacacia woodland,leaf litter decomposition resulted in negative polarization of soil pH value,catalase activity and microbe quantity;Roots decomposition resulted in negative polarization of soil pH value and available P.According to the comprehensive soil properties,both leaf litter and roots resulted in positive polarization,and roots showed greater effect than leaf litter;The mixed decomposition of leaf litter and roots showed inhibitory effect on soil properties.2）In the Q.liaotungensis woodland,leaf litter decomposition resulted in negative polarization of soil sucrase,polyphenoloxidase,catalase,available P and available K;Roots decomposition resulted in negative polarization of catalase activity and available K.According to the comprehensive soil properties,leaf litter decomposition resulted in negative polarization,but roots decomposition produced weak positive polarization;The interaction between them showed weak inhibitory effect on soil properties.3）In the P.simonii woodland,leaf litter decomposition resulted in negative polarization of protease,catalase and available P;roots decomposition induced negative polarization of protease,catalase,microbe quantity and available P.According to the comprehensive soil properties,both leaf litter and roots resulted in negative polarization,and roots showed greater effect than leaf litter;the mixed decomposition of leaf litter and roots showed promoting effect on soil properties.【Conclusion】 In general,from the effect of litter decomposition on soil properties polarization,R.pseudoacaci was more suitable for successive planting in this area during a certain time,followed by Q.liaotungensis,but P.simonii was not suitable.
artificial pure broadleaved forestslitter decompositionsoil properties polarization
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万方数据
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